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Papers by Babak Djahed

Modeling Earth Systems and Environment, Jul 14, 2020

Abstract This study investigated the short-term effects of exposure particulate matter (PM 10 ) i... more Abstract This study investigated the short-term effects of exposure particulate matter (PM 10 ) in Zabol, Iran, from 2013 to 2015. The concentrations of PM 10 recorded from 2013 to 2015 were given as the input to the software (AirQ 2.2.3) developed by the World Health Organization (WHO) to estimate the attributed proportion of the health effects and the number of excess cases related to total mortality (TM), cardiovascular mortality (CM), respiratory mortality (RM), hospital admissions due to cardiovascular disease (HACD), and hospital admissions due to respiratory disease (HARD). According to the data, 73 days during 2013–2014 and 144 days during 2014–2015 in Zabol exceeded the National Ambient Air Quality Standards (NAAQS) guideline limits. This finding indicates the impact of the windy period on the ambient air condition of Zabol’s airshed. Moreover, the number of excess cases attributed to TM, CM, RM, HACD, and HARD per 100,000 people was estimated as 182, 96, 18, 94, and 243 individuals during 2013–2014. However, these values increased by about 50% during 2014–2015. This significant level of health effects of PM 10 on the residents of Zabol necessitates urgent controlling/management actions to reduce dust storms in this region. Graphic abstract

Aqua, Jan 31, 2017

The removal of aniline as a carcinogen from aqueous environments is highly significant. In the pr... more The removal of aniline as a carcinogen from aqueous environments is highly significant. In the present study, the feasibility of photocatalytic degradation of aniline by CuO nanoparticles was evaluated. A batch reactor with an internal UV lamp was used and the effects of the parameters of pH (3-11), dosage of catalyst (0.01-0.1 g/L), initial concentration of aniline (50-250 mg/L), and duration of reaction (15-90 min) were investigated. The remaining concentration of aniline was determined by spectrophotometer at the wavelength of 198 nm. The Langmuir-Hinshelwood model was used for examining the kinetics of the reaction. The results showed that the degradation of aniline is maximum at pH 7. Also, the removal efficiency of 90.16% after 90 minutes of reaction in the case of initial concentration of 50 mg/L was obtained. The aniline degradation was elevated from 40 to 82% by increasing CuO nanoparticles' dosage from 0.01 to 0.1 g/L. In addition, the obtained data properly fit with the Langmuir-Hinshelwood kinetic model and showed that the K app decreased from 0.029 to 0.016 min À1 by increasing of the initial concentration of aniline. Considering the obtained results, the UV/CuO process can be an effective method for removing aniline from aqueous solution.

Journal of Environmental Management, Jun 1, 2018

We used Heat Activated of Persulfate (HAP) to decompose Penicillin G (PEN G) in aqueous solution.... more We used Heat Activated of Persulfate (HAP) to decompose Penicillin G (PEN G) in aqueous solution. The effect of pH (3e11), temperature (313e353 K), and initial concentration of Sodium Persulfate (SPS) (0.05 e0.5 mM) on the decomposition level of PEN G were investigated. The residue of PEN G was determined by spectrophotometry at the wavelength of 290 nm. Also, the Chemical Oxygen Demand (COD) was measured in each experiment. The Total Organic Carbon (TOC) analysis was utilized for surveying the mineralization of PEN G. In addition, based on Arrhenius equation, the activation energy of PEN G decomposition was calculated. The results indicated that the maximum PEN G removal rate was obtained at pH 5 and by increasing the doses of SPS from 0.05 to 0.5 mM, the PEN G decomposition was enhanced. It was found that an increase in temperature is accompanied by an increase in removal efficiency of PEN G. The activation energy of the studied process was determined to be 94.8 kJ mol À1 , suggesting that a moderate activation energy is required for PEN G decomposition. The TOC measurements indicate that the HAP can efficiently mineralize PEN G. Besides, the presence of the scavengers significantly suppressed the HAP process to remove the PEN G. Overall, the results of this study demonstrate that using HAP process can be a suitable method for decomposing of PEN G in aqueous solutions.

Iranian journal of health sciences, Jun 1, 2016

Background and Purpose: Today, by increasing different pollutants, the continuous monitoring of s... more Background and Purpose: Today, by increasing different pollutants, the continuous monitoring of surface waters is essential. Dorudzan Dam is one of the main sources of surface water in Fars Province, Iran; hence, the current study investigated the quality of Dorudzan Reservoir for drinking and irrigation consumptions. Materials and Methods: In this study, various physicochemical parameters [pH, total dissolved salt (TDS), Ca, Mg, electrical conductivity (EC), HCO 3 , CO 3 , Na, Cl, NO 2 , NO 3 , F, SO 4 , K, PO 4 , TH, sodium adsorption ratio, temperature, and turbidity] were measured. Besides, to determine the water quality in the studied water supply, 31 samples (18 samples in the cold seasons and 13 samples in the warm seasons) were taken from the reservoir outlet. For analyzing the gathered data, Canadian Water Quality Index was utilized. Results: The irrigation water quality in the reservoir was determined between 73 and 78 (good) in cold, warm, and all seasons together, and for drinking consumption, the value was 89-90 (very good). The model showed that TDS (480.03 ± 59.14) and HCO 3 (206.71 ± 23.75) in the irrigation consumption and EC (693.00 ± 94.11) and turbidity (1.10 ± 0.23) in the drinking consumption had the greatest contributions in reducing the quality of the water source. Conclusion: The results revealed that generally the physicochemical quality of the reservoir's water was more suitable for drinking consumption in compare to irrigation use. Nevertheless, based on the used model, its quality for irrigation is also desirable.

The Scientific World Journal, 2017

The aim of the present work is to assess feasibility of applying UV-activated persulfate process ... more The aim of the present work is to assess feasibility of applying UV-activated persulfate process in removal of PG from aquatic environments. The study examined the effect of pH (3-11), persulfate initial concentration (0.5-3 mM), reaction time (15-90 minutes), and initial concentration of PG (0.02-0.14 mM) on PG decomposition. Also, the pseudo-first-order kinetic model was used for kinetic analysis of PG removal. The results indicated that UV-activated persulfate process can effectively eliminate PG from water. The highest PG removal efficiency was obtained as 94.28% at pH 5, and the decomposition percentage was raised by increasing persulfate dose from 0.5 to 3 mM and the reaction time from 15 to 90 minutes. Besides, the removal efficiency decreased through increasing the initial concentration of PG. UV-activated persulfate process effectively decomposes PG and eliminates it from water.

Journal of Environmental Health Science and Engineering, 2020

The rice contamination to heavy metals and its associated health risks have been less addressed i... more The rice contamination to heavy metals and its associated health risks have been less addressed in the southeast of Iran. In the present study, in the mentioned region, we assessed the concentration of nine elements in rice, and the health risk related to the measured elements was determined using the data which were gathered by a questionnaire. For this purpose, 36 samples of the 12 most widely consumed rice brands were collected.

Modeling Earth Systems and Environment, 2020

Abstract This study investigated the short-term effects of exposure particulate matter (PM 10 ) i... more Abstract This study investigated the short-term effects of exposure particulate matter (PM 10 ) in Zabol, Iran, from 2013 to 2015. The concentrations of PM 10 recorded from 2013 to 2015 were given as the input to the software (AirQ 2.2.3) developed by the World Health Organization (WHO) to estimate the attributed proportion of the health effects and the number of excess cases related to total mortality (TM), cardiovascular mortality (CM), respiratory mortality (RM), hospital admissions due to cardiovascular disease (HACD), and hospital admissions due to respiratory disease (HARD). According to the data, 73 days during 2013–2014 and 144 days during 2014–2015 in Zabol exceeded the National Ambient Air Quality Standards (NAAQS) guideline limits. This finding indicates the impact of the windy period on the ambient air condition of Zabol’s airshed. Moreover, the number of excess cases attributed to TM, CM, RM, HACD, and HARD per 100,000 people was estimated as 182, 96, 18, 94, and 243 individuals during 2013–2014. However, these values increased by about 50% during 2014–2015. This significant level of health effects of PM 10 on the residents of Zabol necessitates urgent controlling/management actions to reduce dust storms in this region. Graphic abstract

PeerJ, 2018

Organic pollutants contaminate water resources and the environment when discharged into water str... more Organic pollutants contaminate water resources and the environment when discharged into water streams. Also, the presence of these materials in incompletely treated or untreated wastewater leads to serious environmental hazards. The hydroxyl radicals and holes are regarded as the most oxidant species in the degradation of organic pollutants using the studied composites. The results of this review show that heteropoly acids on supporting materials could be considered as appropriate photocatalysts in the removal of organic pollutant from aqueous solutions.

Journal of Environmental Management, 2018

We used Heat Activated of Persulfate (HAP) to decompose Penicillin G (PEN G) in aqueous solution.... more We used Heat Activated of Persulfate (HAP) to decompose Penicillin G (PEN G) in aqueous solution. The effect of pH (3e11), temperature (313e353 K), and initial concentration of Sodium Persulfate (SPS) (0.05 e0.5 mM) on the decomposition level of PEN G were investigated. The residue of PEN G was determined by spectrophotometry at the wavelength of 290 nm. Also, the Chemical Oxygen Demand (COD) was measured in each experiment. The Total Organic Carbon (TOC) analysis was utilized for surveying the mineralization of PEN G. In addition, based on Arrhenius equation, the activation energy of PEN G decomposition was calculated. The results indicated that the maximum PEN G removal rate was obtained at pH 5 and by increasing the doses of SPS from 0.05 to 0.5 mM, the PEN G decomposition was enhanced. It was found that an increase in temperature is accompanied by an increase in removal efficiency of PEN G. The activation energy of the studied process was determined to be 94.8 kJ mol À1 , suggesting that a moderate activation energy is required for PEN G decomposition. The TOC measurements indicate that the HAP can efficiently mineralize PEN G. Besides, the presence of the scavengers significantly suppressed the HAP process to remove the PEN G. Overall, the results of this study demonstrate that using HAP process can be a suitable method for decomposing of PEN G in aqueous solutions.

Journal of Water Supply: Research and Technology - Aqua, 2017

The removal of aniline as a carcinogen from aqueous environments is highly significant. In the pr... more The removal of aniline as a carcinogen from aqueous environments is highly significant. In the present study, the feasibility of photocatalytic degradation of aniline by CuO nanoparticles was evaluated. A batch reactor with an internal UV lamp was used and the effects of the parameters of pH (3-11), dosage of catalyst (0.01-0.1 g/L), initial concentration of aniline (50-250 mg/L), and duration of reaction (15-90 min) were investigated. The remaining concentration of aniline was determined by spectrophotometer at the wavelength of 198 nm. The Langmuir-Hinshelwood model was used for examining the kinetics of the reaction. The results showed that the degradation of aniline is maximum at pH 7. Also, the removal efficiency of 90.16% after 90 minutes of reaction in the case of initial concentration of 50 mg/L was obtained. The aniline degradation was elevated from 40 to 82% by increasing CuO nanoparticles' dosage from 0.01 to 0.1 g/L. In addition, the obtained data properly fit with the Langmuir-Hinshelwood kinetic model and showed that the K app decreased from 0.029 to 0.016 min À1 by increasing of the initial concentration of aniline. Considering the obtained results, the UV/CuO process can be an effective method for removing aniline from aqueous solution.

The Scientific World Journal, 2017

Penicillin G (PG) is one of the most widely consumed antibiotics around the world. Release of PG ... more Penicillin G (PG) is one of the most widely consumed antibiotics around the world. Release of PG in environment may lead to contamination of water resources. The aim of the present work is to assess feasibility of applying UV-activated persulfate process in removal of PG from aquatic environments. The study examined the effect of pH (3–11), persulfate initial concentration (0.5–3 mM), reaction time (15–90 minutes), and initial concentration of PG (0.02–0.14 mM) on PG decomposition. Also, the pseudo-first-order kinetic model was used for kinetic analysis of PG removal. The results indicated that UV-activated persulfate process can effectively eliminate PG from water. The highest PG removal efficiency was obtained as 94.28% at pH 5, and the decomposition percentage was raised by increasing persulfate dose from 0.5 to 3 mM and the reaction time from 15 to 90 minutes. Besides, the removal efficiency decreased through increasing the initial concentration of PG. UV-activated persulfate pr...

Desalination and Water Treatment, 2015

AbstractThe current study aims to present a novel and inexpensive method for producing activated ... more AbstractThe current study aims to present a novel and inexpensive method for producing activated carbon using waste polyethylene terephthalate (PET) bottles in order to remove methylene blue (MB) dye from aqueous solution. Here, a novel method for producing activated carbon is developed by utilizing KOH and combining the carbonation and activation processes. Besides, the inert gases are not used in the production process. In order to determine the characteristics of the produced activated carbon texture, N2 gas adsorption at 77 K and scanning electron microscope are used. The adsorption isotherms of MB have been studied using Langmuir, Freundlich, Dubinin–Radushkevich, and Temkin models. The specific surface area and the total volume of the generated activated carbon pores are 353.307 m2/g and 0.288 cc/g, respectively. In addition, qmax for adsorption of MB dye is obtained as 404.089 mg/g. Obtained results show that the Langmuir isotherm model has the best fitness. The values of R2, the sum of squares of ...

Iranian Journal of Health and Environment, 2016

Food and Chemical Toxicology

An investigation of some heavy metals content in rice (Oryza sativa) and associated health risks ... more An investigation of some heavy metals content in rice (Oryza sativa) and associated health risks was carried out for residents of Iranshahr city, Iran. Average daily rice consumption of the citizens and most widely used rice brands in the market of Iranshahr were determined using a questionnaire. Besides, the concentration of heavy metals in the gathered rice samples was measured by inductively coupled plasma mass spectrometry (ICP-MS). Monte Carlo uncertainty simulation was utilized in conducting exposure assessment and investigating the non-carcinogenic effects of the studied elements as well as the carcinogenic effect of As. Concentrations of As, Cd, Pb, Cu, Al, and Mo were 0.369 ± 0.094, 0.0337 ± 0.039, 0.123 ± 0.14, 3.095 ± 439.42, 39.6 ± 14.73, and 1.106 ± 0.133 mg kg-1, respectively. Al (0.18 ± 0.15 mg kg-1 d-1) and Cd (0.00015 ± 0.00034 mg kg-1 d-1) were the highest and lowest estimated daily intake, respectively. Except As (5.23 ± 4.01), the calculated hazard quotient for investigated elements showed no non-carcinogenic health risk. Besides, the simulation of the carcinogenic risk effect for As (2.37E-3) revealed that the ingestion of the studied rice brands would cause cancer risk due to lifetime consumption. Results show that consumption of rice in the Iranshahr city is a potential source of exposure to the studied elements.

Modeling Earth Systems and Environment, Jul 14, 2020

Abstract This study investigated the short-term effects of exposure particulate matter (PM 10 ) i... more Abstract This study investigated the short-term effects of exposure particulate matter (PM 10 ) in Zabol, Iran, from 2013 to 2015. The concentrations of PM 10 recorded from 2013 to 2015 were given as the input to the software (AirQ 2.2.3) developed by the World Health Organization (WHO) to estimate the attributed proportion of the health effects and the number of excess cases related to total mortality (TM), cardiovascular mortality (CM), respiratory mortality (RM), hospital admissions due to cardiovascular disease (HACD), and hospital admissions due to respiratory disease (HARD). According to the data, 73 days during 2013–2014 and 144 days during 2014–2015 in Zabol exceeded the National Ambient Air Quality Standards (NAAQS) guideline limits. This finding indicates the impact of the windy period on the ambient air condition of Zabol’s airshed. Moreover, the number of excess cases attributed to TM, CM, RM, HACD, and HARD per 100,000 people was estimated as 182, 96, 18, 94, and 243 individuals during 2013–2014. However, these values increased by about 50% during 2014–2015. This significant level of health effects of PM 10 on the residents of Zabol necessitates urgent controlling/management actions to reduce dust storms in this region. Graphic abstract

Aqua, Jan 31, 2017

The removal of aniline as a carcinogen from aqueous environments is highly significant. In the pr... more The removal of aniline as a carcinogen from aqueous environments is highly significant. In the present study, the feasibility of photocatalytic degradation of aniline by CuO nanoparticles was evaluated. A batch reactor with an internal UV lamp was used and the effects of the parameters of pH (3-11), dosage of catalyst (0.01-0.1 g/L), initial concentration of aniline (50-250 mg/L), and duration of reaction (15-90 min) were investigated. The remaining concentration of aniline was determined by spectrophotometer at the wavelength of 198 nm. The Langmuir-Hinshelwood model was used for examining the kinetics of the reaction. The results showed that the degradation of aniline is maximum at pH 7. Also, the removal efficiency of 90.16% after 90 minutes of reaction in the case of initial concentration of 50 mg/L was obtained. The aniline degradation was elevated from 40 to 82% by increasing CuO nanoparticles' dosage from 0.01 to 0.1 g/L. In addition, the obtained data properly fit with the Langmuir-Hinshelwood kinetic model and showed that the K app decreased from 0.029 to 0.016 min À1 by increasing of the initial concentration of aniline. Considering the obtained results, the UV/CuO process can be an effective method for removing aniline from aqueous solution.

Journal of Environmental Management, Jun 1, 2018

We used Heat Activated of Persulfate (HAP) to decompose Penicillin G (PEN G) in aqueous solution.... more We used Heat Activated of Persulfate (HAP) to decompose Penicillin G (PEN G) in aqueous solution. The effect of pH (3e11), temperature (313e353 K), and initial concentration of Sodium Persulfate (SPS) (0.05 e0.5 mM) on the decomposition level of PEN G were investigated. The residue of PEN G was determined by spectrophotometry at the wavelength of 290 nm. Also, the Chemical Oxygen Demand (COD) was measured in each experiment. The Total Organic Carbon (TOC) analysis was utilized for surveying the mineralization of PEN G. In addition, based on Arrhenius equation, the activation energy of PEN G decomposition was calculated. The results indicated that the maximum PEN G removal rate was obtained at pH 5 and by increasing the doses of SPS from 0.05 to 0.5 mM, the PEN G decomposition was enhanced. It was found that an increase in temperature is accompanied by an increase in removal efficiency of PEN G. The activation energy of the studied process was determined to be 94.8 kJ mol À1 , suggesting that a moderate activation energy is required for PEN G decomposition. The TOC measurements indicate that the HAP can efficiently mineralize PEN G. Besides, the presence of the scavengers significantly suppressed the HAP process to remove the PEN G. Overall, the results of this study demonstrate that using HAP process can be a suitable method for decomposing of PEN G in aqueous solutions.

Iranian journal of health sciences, Jun 1, 2016

Background and Purpose: Today, by increasing different pollutants, the continuous monitoring of s... more Background and Purpose: Today, by increasing different pollutants, the continuous monitoring of surface waters is essential. Dorudzan Dam is one of the main sources of surface water in Fars Province, Iran; hence, the current study investigated the quality of Dorudzan Reservoir for drinking and irrigation consumptions. Materials and Methods: In this study, various physicochemical parameters [pH, total dissolved salt (TDS), Ca, Mg, electrical conductivity (EC), HCO 3 , CO 3 , Na, Cl, NO 2 , NO 3 , F, SO 4 , K, PO 4 , TH, sodium adsorption ratio, temperature, and turbidity] were measured. Besides, to determine the water quality in the studied water supply, 31 samples (18 samples in the cold seasons and 13 samples in the warm seasons) were taken from the reservoir outlet. For analyzing the gathered data, Canadian Water Quality Index was utilized. Results: The irrigation water quality in the reservoir was determined between 73 and 78 (good) in cold, warm, and all seasons together, and for drinking consumption, the value was 89-90 (very good). The model showed that TDS (480.03 ± 59.14) and HCO 3 (206.71 ± 23.75) in the irrigation consumption and EC (693.00 ± 94.11) and turbidity (1.10 ± 0.23) in the drinking consumption had the greatest contributions in reducing the quality of the water source. Conclusion: The results revealed that generally the physicochemical quality of the reservoir's water was more suitable for drinking consumption in compare to irrigation use. Nevertheless, based on the used model, its quality for irrigation is also desirable.

The Scientific World Journal, 2017

The aim of the present work is to assess feasibility of applying UV-activated persulfate process ... more The aim of the present work is to assess feasibility of applying UV-activated persulfate process in removal of PG from aquatic environments. The study examined the effect of pH (3-11), persulfate initial concentration (0.5-3 mM), reaction time (15-90 minutes), and initial concentration of PG (0.02-0.14 mM) on PG decomposition. Also, the pseudo-first-order kinetic model was used for kinetic analysis of PG removal. The results indicated that UV-activated persulfate process can effectively eliminate PG from water. The highest PG removal efficiency was obtained as 94.28% at pH 5, and the decomposition percentage was raised by increasing persulfate dose from 0.5 to 3 mM and the reaction time from 15 to 90 minutes. Besides, the removal efficiency decreased through increasing the initial concentration of PG. UV-activated persulfate process effectively decomposes PG and eliminates it from water.

Journal of Environmental Health Science and Engineering, 2020

The rice contamination to heavy metals and its associated health risks have been less addressed i... more The rice contamination to heavy metals and its associated health risks have been less addressed in the southeast of Iran. In the present study, in the mentioned region, we assessed the concentration of nine elements in rice, and the health risk related to the measured elements was determined using the data which were gathered by a questionnaire. For this purpose, 36 samples of the 12 most widely consumed rice brands were collected.

Modeling Earth Systems and Environment, 2020

Abstract This study investigated the short-term effects of exposure particulate matter (PM 10 ) i... more Abstract This study investigated the short-term effects of exposure particulate matter (PM 10 ) in Zabol, Iran, from 2013 to 2015. The concentrations of PM 10 recorded from 2013 to 2015 were given as the input to the software (AirQ 2.2.3) developed by the World Health Organization (WHO) to estimate the attributed proportion of the health effects and the number of excess cases related to total mortality (TM), cardiovascular mortality (CM), respiratory mortality (RM), hospital admissions due to cardiovascular disease (HACD), and hospital admissions due to respiratory disease (HARD). According to the data, 73 days during 2013–2014 and 144 days during 2014–2015 in Zabol exceeded the National Ambient Air Quality Standards (NAAQS) guideline limits. This finding indicates the impact of the windy period on the ambient air condition of Zabol’s airshed. Moreover, the number of excess cases attributed to TM, CM, RM, HACD, and HARD per 100,000 people was estimated as 182, 96, 18, 94, and 243 individuals during 2013–2014. However, these values increased by about 50% during 2014–2015. This significant level of health effects of PM 10 on the residents of Zabol necessitates urgent controlling/management actions to reduce dust storms in this region. Graphic abstract

PeerJ, 2018

Organic pollutants contaminate water resources and the environment when discharged into water str... more Organic pollutants contaminate water resources and the environment when discharged into water streams. Also, the presence of these materials in incompletely treated or untreated wastewater leads to serious environmental hazards. The hydroxyl radicals and holes are regarded as the most oxidant species in the degradation of organic pollutants using the studied composites. The results of this review show that heteropoly acids on supporting materials could be considered as appropriate photocatalysts in the removal of organic pollutant from aqueous solutions.

Journal of Environmental Management, 2018

We used Heat Activated of Persulfate (HAP) to decompose Penicillin G (PEN G) in aqueous solution.... more We used Heat Activated of Persulfate (HAP) to decompose Penicillin G (PEN G) in aqueous solution. The effect of pH (3e11), temperature (313e353 K), and initial concentration of Sodium Persulfate (SPS) (0.05 e0.5 mM) on the decomposition level of PEN G were investigated. The residue of PEN G was determined by spectrophotometry at the wavelength of 290 nm. Also, the Chemical Oxygen Demand (COD) was measured in each experiment. The Total Organic Carbon (TOC) analysis was utilized for surveying the mineralization of PEN G. In addition, based on Arrhenius equation, the activation energy of PEN G decomposition was calculated. The results indicated that the maximum PEN G removal rate was obtained at pH 5 and by increasing the doses of SPS from 0.05 to 0.5 mM, the PEN G decomposition was enhanced. It was found that an increase in temperature is accompanied by an increase in removal efficiency of PEN G. The activation energy of the studied process was determined to be 94.8 kJ mol À1 , suggesting that a moderate activation energy is required for PEN G decomposition. The TOC measurements indicate that the HAP can efficiently mineralize PEN G. Besides, the presence of the scavengers significantly suppressed the HAP process to remove the PEN G. Overall, the results of this study demonstrate that using HAP process can be a suitable method for decomposing of PEN G in aqueous solutions.

Journal of Water Supply: Research and Technology - Aqua, 2017

The removal of aniline as a carcinogen from aqueous environments is highly significant. In the pr... more The removal of aniline as a carcinogen from aqueous environments is highly significant. In the present study, the feasibility of photocatalytic degradation of aniline by CuO nanoparticles was evaluated. A batch reactor with an internal UV lamp was used and the effects of the parameters of pH (3-11), dosage of catalyst (0.01-0.1 g/L), initial concentration of aniline (50-250 mg/L), and duration of reaction (15-90 min) were investigated. The remaining concentration of aniline was determined by spectrophotometer at the wavelength of 198 nm. The Langmuir-Hinshelwood model was used for examining the kinetics of the reaction. The results showed that the degradation of aniline is maximum at pH 7. Also, the removal efficiency of 90.16% after 90 minutes of reaction in the case of initial concentration of 50 mg/L was obtained. The aniline degradation was elevated from 40 to 82% by increasing CuO nanoparticles' dosage from 0.01 to 0.1 g/L. In addition, the obtained data properly fit with the Langmuir-Hinshelwood kinetic model and showed that the K app decreased from 0.029 to 0.016 min À1 by increasing of the initial concentration of aniline. Considering the obtained results, the UV/CuO process can be an effective method for removing aniline from aqueous solution.

The Scientific World Journal, 2017

Penicillin G (PG) is one of the most widely consumed antibiotics around the world. Release of PG ... more Penicillin G (PG) is one of the most widely consumed antibiotics around the world. Release of PG in environment may lead to contamination of water resources. The aim of the present work is to assess feasibility of applying UV-activated persulfate process in removal of PG from aquatic environments. The study examined the effect of pH (3–11), persulfate initial concentration (0.5–3 mM), reaction time (15–90 minutes), and initial concentration of PG (0.02–0.14 mM) on PG decomposition. Also, the pseudo-first-order kinetic model was used for kinetic analysis of PG removal. The results indicated that UV-activated persulfate process can effectively eliminate PG from water. The highest PG removal efficiency was obtained as 94.28% at pH 5, and the decomposition percentage was raised by increasing persulfate dose from 0.5 to 3 mM and the reaction time from 15 to 90 minutes. Besides, the removal efficiency decreased through increasing the initial concentration of PG. UV-activated persulfate pr...

Desalination and Water Treatment, 2015

AbstractThe current study aims to present a novel and inexpensive method for producing activated ... more AbstractThe current study aims to present a novel and inexpensive method for producing activated carbon using waste polyethylene terephthalate (PET) bottles in order to remove methylene blue (MB) dye from aqueous solution. Here, a novel method for producing activated carbon is developed by utilizing KOH and combining the carbonation and activation processes. Besides, the inert gases are not used in the production process. In order to determine the characteristics of the produced activated carbon texture, N2 gas adsorption at 77 K and scanning electron microscope are used. The adsorption isotherms of MB have been studied using Langmuir, Freundlich, Dubinin–Radushkevich, and Temkin models. The specific surface area and the total volume of the generated activated carbon pores are 353.307 m2/g and 0.288 cc/g, respectively. In addition, qmax for adsorption of MB dye is obtained as 404.089 mg/g. Obtained results show that the Langmuir isotherm model has the best fitness. The values of R2, the sum of squares of ...

Iranian Journal of Health and Environment, 2016

Food and Chemical Toxicology

An investigation of some heavy metals content in rice (Oryza sativa) and associated health risks ... more An investigation of some heavy metals content in rice (Oryza sativa) and associated health risks was carried out for residents of Iranshahr city, Iran. Average daily rice consumption of the citizens and most widely used rice brands in the market of Iranshahr were determined using a questionnaire. Besides, the concentration of heavy metals in the gathered rice samples was measured by inductively coupled plasma mass spectrometry (ICP-MS). Monte Carlo uncertainty simulation was utilized in conducting exposure assessment and investigating the non-carcinogenic effects of the studied elements as well as the carcinogenic effect of As. Concentrations of As, Cd, Pb, Cu, Al, and Mo were 0.369 ± 0.094, 0.0337 ± 0.039, 0.123 ± 0.14, 3.095 ± 439.42, 39.6 ± 14.73, and 1.106 ± 0.133 mg kg-1, respectively. Al (0.18 ± 0.15 mg kg-1 d-1) and Cd (0.00015 ± 0.00034 mg kg-1 d-1) were the highest and lowest estimated daily intake, respectively. Except As (5.23 ± 4.01), the calculated hazard quotient for investigated elements showed no non-carcinogenic health risk. Besides, the simulation of the carcinogenic risk effect for As (2.37E-3) revealed that the ingestion of the studied rice brands would cause cancer risk due to lifetime consumption. Results show that consumption of rice in the Iranshahr city is a potential source of exposure to the studied elements.