Jyoti Chawla | MRIU - Academia.edu (original) (raw)

Papers by Jyoti Chawla

Advances in computational intelligence and robotics book series, Apr 26, 2024

Aqua, May 6, 2019

Defluoridation of water using an economic method is important to combat the issue of excessive fl... more Defluoridation of water using an economic method is important to combat the issue of excessive fluoride content (>1.5 mg/L), which is very detrimental to human health, in drinking water. In the present work, micelle templated mesoporous material, MCM-41, was synthesized and explored as an adsorbent for adsorption of fluoride ions from aqueous media and the process of adsorption was optimized through three levels of Box-Behnken design (BBD) of response surface methodology (RSM). The data obtained were found to be best fitted for Langmuir adsorption isotherm suggesting monolayer adsorption of fluoride ions on the surface of micelle templated MCM-41; Langmuir maximum adsorption capacity was found to be 52.91 mg/g. Optimization through BBD involves approximation of selected input of independent variables, i.e., initial fluoride concentration, solution pH and adsorbent dose with percentage removal of fluoride as the response variable. The quadratic model was suggested to predict the percentage removal of fluoride ions. As per the prediction, maximum removal of 82% can be achieved at initial concentration up to 21 ppm in pH range of 5.4-5.8 and adsorbent dose of 1-1.3 g/L. Experimental and model predicted values of adsorption were found to be in good agreement with each other.

Water Environment Research, Jul 28, 2019

Aqua, Nov 10, 2017

Punica granatum carpellary membrane (PGCM) has been chemically modified with 2,4dinitrophenylhydr... more Punica granatum carpellary membrane (PGCM) has been chemically modified with 2,4dinitrophenylhydrazine by one step reaction process. Pristine PGCM and modified Punica granatum carpellary membrane (MPGCM) have been employed as adsorbents for removal of cadmium (II) ions from aqueous solution. Modification on the surface of PGCM was characterized by Fourier transform infrared, scanning electron microscope, energy dispersive X-ray spectroscopy and X-ray diffraction techniques. Removal of Cd (II) ions was carried out at various optimized conditions, i.e. adsorbent dose (20 mg/l), pH (7), contact time (2 h), and temperature (303 K). The Langmuir isotherm model was the best fit with a high value of regression coefficient (R 2 ¼ 0.991-0.999) compared with the Freundlich and Temkin models. Langmuir maximum adsorption capacity for cadmium was found to be 111.11 mg/g for PGCM and 142.85 mg/g for MPGCM. Kinetics of adsorption of cadmium onto MPGCM was best described by pseudo-second-order kinetics model compared with pseudo-firstorder. The negative value of free energy change showed that adsorption was highly spontaneous and favorable. Also the positive value of entropy and enthalpy showed that the process of adsorption was associated with increased randomness and endothermic in nature. Mechanism of removal of cadmium ions from water by MPGCM has also been explicated.

SN applied sciences, Jul 22, 2019

Adsorption of lead ions by mesoporous material incorporating Gemini surfactant C16-6-16 (G-MCM-41... more Adsorption of lead ions by mesoporous material incorporating Gemini surfactant C16-6-16 (G-MCM-41) was investigated using response surface methodology. The effect of pH, initial metal concentration and contact time was studied using Box-Behnken design (BBD). The optimal parameters for maximum adsorption capacity (81.92 mg/g) were obtained at pH 5.85, initial lead ion concentration 99.02 mg/L, and contact time 118.49 min. The effect of different variables and their interactions were assessed by analysis of variance (ANOVA). The surface and contour response plot shows the interaction of different variables and response. The experimental data fits best in the quadratic model with maximum predicted R2 value of 0.9013 and Prob > F is <0.0001 showing the model is significant.

Water Science and Technology, Mar 20, 2018

A spectrophotometric method based on diazotization of aniline with triclosan has been developed f... more A spectrophotometric method based on diazotization of aniline with triclosan has been developed for the determination of triclosan in water samples. The diazotization process involves two steps: (1) reaction of aniline with sodium nitrite in an acidic medium to form diazonium ion and (2) reaction of diazonium ion with triclosan to form a yellowish-orange azo compound in an alkaline medium. The resulting yellowish-orange product has a maximum absorption at 352 nm which allows the determination of triclosan in aqueous solution in the linear concentration range of 0.1-3.0 μM with R 2 ¼ 0.998. The concentration of hydrochloric acid, sodium nitrite, and aniline was optimized for diazotization reaction to achieve good spectrophotometric determination of triclosan. The optimization of experimental conditions for spectrophotometric determination of triclosan in terms of concentration of sodium nitrite, hydrogen chloride and aniline was also carried out by using Box-Behnken design of response surface methodology and results obtained were in agreement with the experimentally optimized values. The proposed method was then successfully applied for analyses of triclosan content in water samples.

Russian Journal of Applied Chemistry, Oct 1, 2022

CRC Press eBooks, Feb 27, 2023

Malaysian Journal of Science. Series B, Physical & Earth Sciences, Feb 28, 2021

Mitigation of Pb(II) ions from water using economic method is an important research area to comba... more Mitigation of Pb(II) ions from water using economic method is an important research area to combat the pollution due to lead ions Pb(II) in water as it have severe toxic effects in human beings. In present work, Pristine Pavo Cristatus feather powder (PCFP) has been employed for removal of Pb(II) ions and the process of adsorption was optimized through four level Box Behnken design (BBD) of response surface methodology (RSM) over a broad range of pH (3.0-9.0), initial lead ion concentration (20-100 mg/L), contact time (20-180 min) and temperature (297 K to 333 K). Different isotherms were applied to confirm the type of adsorption. Langmuir maximum removal efficiency was 121.95 mg/g for lead ions adsorption onto PCPF at optimal values of pH 6; adsorbent dose 20 mg/L; temperature 303 K and contact time 120 minutes obtained from batch studies. Pseudo-secondorder reaction model showed good applicability for kinetic studies. Thermodynamic parameters were also evaluated to check feasibility and nature of adsorption. The optimal parameters obtained for maximum Pb(II) ions adsorption were at pH = 6.31, initial Pb(II) ion = 43.79 mg/L, contact time = 119.51 minutes and temperature = 59.67 o C. The experimental and predicted values were found to be in good agreement with each other.

Water Quality, Exposure and Health, Nov 9, 2013

ABSTRACT Environmental water samples contain wide range of contaminants including heavy metal ion... more ABSTRACT Environmental water samples contain wide range of contaminants including heavy metal ions that are required only in trace amount. Excessive level of metal ions in water may be detrimental to health and environment. Heavy metal poisoning has been a serious concern all over the globe. Heavy metals are well known to be non-biodegradable and tend to bio-accumulate at various concentrations. A number of methods have been proposed to remove heavy metal ions from water and among them adsorption is one of the best methods. Cadmium has been identified as one of the toxic heavy metals that enters the water through disposal of waste from industries. The increasing technological use of cadmium has raised the concern for its removal from water/wastewater. This review article provides an overview of use of nano-metal oxides as adsorbents for removal of cadmium from water/wastewater. This study involves the identification of environmentally friendly, low-cost and efficient nano-metal oxide sorbents for water/wastewater purification. A detailed comparison of reported nano-metal oxide sorbents has been done in order to rank them and to predict the knowledge gaps in this area.

IntechOpen eBooks, Aug 19, 2020

World is facing scarcity of pure and safe drinkable water and third world war would be based on t... more World is facing scarcity of pure and safe drinkable water and third world war would be based on this issue. Recently ground water is excessively used to meet drinking water needs. Water is the principal source of fluoride in daily intake. Excessive fluoride content in ground water due to leaching from fluoride bearing rocks, pose a serious threat worldwide. Concentration of fluoride in drinking water beyond the recommended standards may lead to serious health problems such as skeletal problems, restricted movement, severe anemia and fluorosis. De-fluoridation of water is quite difficult and expensive. Various materials and technologies have been developed to solve this world wide problem. Ion-exchange, precipitation, electro-chemical, reverse osmosis and adsorption are most widely applied methods for de-fluoridation of water. The main highlight of this chapter is to identify and compare carbon-based materials for de-fluoridation of water on the basis of their efficiency, cost and availability. Challenges associated with the development and use of cost effective and environmental friendly materials for de-fluoridation of water have also been discussed.

Russian Journal of Applied Chemistry, Sep 1, 2022

DESALINATION AND WATER TREATMENT, 2022

Toxin Reviews, Apr 12, 2021

EAI/Springer Innovations in Communication and Computing, 2021

Management and control of pandemic and endemic diseases is one of most important issue in order t... more Management and control of pandemic and endemic diseases is one of most important issue in order to deal with unpredicted health emergencies and fatalities all over the world. Covid-19, a new version of corona virus, originated from the Wuhan province of mainland China somewhere in December 2019 and has spread across the globe. Pandemic Covid-19 has affected the life of humans in almost every region of the world. Different strategies were planned by the regulatory bodies of different countries in order to slow down the transmission rate. The transmission rate was not uniform and varied from region to region. This chapter highlights the transmission dynamics of the virus and monitors the transmission among top five countries with highest number of infected persons as on May 31, 2020 and predicts the situation further. Linear regression techniques have been used for the purpose of analysis and prediction. The prediction model obtained is based on the trend of the data with highest R2value and minimum residual. The model helps the authorities to make necessary arrangements during the emergency.

Advances in environmental engineering and green technologies book series, 2019

Medical diagnosis with the help of computational techniques is a very useful tool for doctors for... more Medical diagnosis with the help of computational techniques is a very useful tool for doctors for the purpose of better diagnosis. In this chapter, an attempt has been made to reduce the number of tests required for diagnosis using generalized fuzzy sets for initial decision making as per the characteristics of ingested water in normal routine. The quality of water in terms of type and concentration of contaminants varies from region to region. The analogy between concentration of different contaminants in drinking water and risk analysis based on intuitionistic fuzzy sets (IFSs) have been investigated. Hypothetical data was processed in view of the finite set of heavy metals, diseases, and places to investigate the effect of selected heavy metal on the human health. The findings will not only help in diagnosis but also offer cost-cutting and ecofriendly strategy by avoiding unnecessary clinical laboratory examinations.

Huge quantities of municipal and industrial wastewater are being generated in our country. Safe d... more Huge quantities of municipal and industrial wastewater are being generated in our country. Safe disposal/reuse of wastewater is necessary to reduce pollution and partially overcome water scarcity. Constructed wetlands are an exciting new application of technology that is very effective in improving water quality. This paper describes various types of constructed wetlands with emphasis on subsurface constructed wetlands, mechanisms involved, in the treatment process alongwith advantages and limitations. A few case studies have also been presented. The results of these studies prove that high degree of purification from domestic as well as industrial wastewater can be achieved by using this technique. These systems have great scope in developing countries due to their low cost, minimum maintenance and high efficiency.

Oriental Journal of Chemistry/Oriental journal of chemistry, Jun 27, 2024

Advances in computational intelligence and robotics book series, Apr 26, 2024

Aqua, May 6, 2019

Defluoridation of water using an economic method is important to combat the issue of excessive fl... more Defluoridation of water using an economic method is important to combat the issue of excessive fluoride content (>1.5 mg/L), which is very detrimental to human health, in drinking water. In the present work, micelle templated mesoporous material, MCM-41, was synthesized and explored as an adsorbent for adsorption of fluoride ions from aqueous media and the process of adsorption was optimized through three levels of Box-Behnken design (BBD) of response surface methodology (RSM). The data obtained were found to be best fitted for Langmuir adsorption isotherm suggesting monolayer adsorption of fluoride ions on the surface of micelle templated MCM-41; Langmuir maximum adsorption capacity was found to be 52.91 mg/g. Optimization through BBD involves approximation of selected input of independent variables, i.e., initial fluoride concentration, solution pH and adsorbent dose with percentage removal of fluoride as the response variable. The quadratic model was suggested to predict the percentage removal of fluoride ions. As per the prediction, maximum removal of 82% can be achieved at initial concentration up to 21 ppm in pH range of 5.4-5.8 and adsorbent dose of 1-1.3 g/L. Experimental and model predicted values of adsorption were found to be in good agreement with each other.

Water Environment Research, Jul 28, 2019

Aqua, Nov 10, 2017

Punica granatum carpellary membrane (PGCM) has been chemically modified with 2,4dinitrophenylhydr... more Punica granatum carpellary membrane (PGCM) has been chemically modified with 2,4dinitrophenylhydrazine by one step reaction process. Pristine PGCM and modified Punica granatum carpellary membrane (MPGCM) have been employed as adsorbents for removal of cadmium (II) ions from aqueous solution. Modification on the surface of PGCM was characterized by Fourier transform infrared, scanning electron microscope, energy dispersive X-ray spectroscopy and X-ray diffraction techniques. Removal of Cd (II) ions was carried out at various optimized conditions, i.e. adsorbent dose (20 mg/l), pH (7), contact time (2 h), and temperature (303 K). The Langmuir isotherm model was the best fit with a high value of regression coefficient (R 2 ¼ 0.991-0.999) compared with the Freundlich and Temkin models. Langmuir maximum adsorption capacity for cadmium was found to be 111.11 mg/g for PGCM and 142.85 mg/g for MPGCM. Kinetics of adsorption of cadmium onto MPGCM was best described by pseudo-second-order kinetics model compared with pseudo-firstorder. The negative value of free energy change showed that adsorption was highly spontaneous and favorable. Also the positive value of entropy and enthalpy showed that the process of adsorption was associated with increased randomness and endothermic in nature. Mechanism of removal of cadmium ions from water by MPGCM has also been explicated.

SN applied sciences, Jul 22, 2019

Adsorption of lead ions by mesoporous material incorporating Gemini surfactant C16-6-16 (G-MCM-41... more Adsorption of lead ions by mesoporous material incorporating Gemini surfactant C16-6-16 (G-MCM-41) was investigated using response surface methodology. The effect of pH, initial metal concentration and contact time was studied using Box-Behnken design (BBD). The optimal parameters for maximum adsorption capacity (81.92 mg/g) were obtained at pH 5.85, initial lead ion concentration 99.02 mg/L, and contact time 118.49 min. The effect of different variables and their interactions were assessed by analysis of variance (ANOVA). The surface and contour response plot shows the interaction of different variables and response. The experimental data fits best in the quadratic model with maximum predicted R2 value of 0.9013 and Prob > F is <0.0001 showing the model is significant.

Water Science and Technology, Mar 20, 2018

A spectrophotometric method based on diazotization of aniline with triclosan has been developed f... more A spectrophotometric method based on diazotization of aniline with triclosan has been developed for the determination of triclosan in water samples. The diazotization process involves two steps: (1) reaction of aniline with sodium nitrite in an acidic medium to form diazonium ion and (2) reaction of diazonium ion with triclosan to form a yellowish-orange azo compound in an alkaline medium. The resulting yellowish-orange product has a maximum absorption at 352 nm which allows the determination of triclosan in aqueous solution in the linear concentration range of 0.1-3.0 μM with R 2 ¼ 0.998. The concentration of hydrochloric acid, sodium nitrite, and aniline was optimized for diazotization reaction to achieve good spectrophotometric determination of triclosan. The optimization of experimental conditions for spectrophotometric determination of triclosan in terms of concentration of sodium nitrite, hydrogen chloride and aniline was also carried out by using Box-Behnken design of response surface methodology and results obtained were in agreement with the experimentally optimized values. The proposed method was then successfully applied for analyses of triclosan content in water samples.

Russian Journal of Applied Chemistry, Oct 1, 2022

CRC Press eBooks, Feb 27, 2023

Malaysian Journal of Science. Series B, Physical & Earth Sciences, Feb 28, 2021

Mitigation of Pb(II) ions from water using economic method is an important research area to comba... more Mitigation of Pb(II) ions from water using economic method is an important research area to combat the pollution due to lead ions Pb(II) in water as it have severe toxic effects in human beings. In present work, Pristine Pavo Cristatus feather powder (PCFP) has been employed for removal of Pb(II) ions and the process of adsorption was optimized through four level Box Behnken design (BBD) of response surface methodology (RSM) over a broad range of pH (3.0-9.0), initial lead ion concentration (20-100 mg/L), contact time (20-180 min) and temperature (297 K to 333 K). Different isotherms were applied to confirm the type of adsorption. Langmuir maximum removal efficiency was 121.95 mg/g for lead ions adsorption onto PCPF at optimal values of pH 6; adsorbent dose 20 mg/L; temperature 303 K and contact time 120 minutes obtained from batch studies. Pseudo-secondorder reaction model showed good applicability for kinetic studies. Thermodynamic parameters were also evaluated to check feasibility and nature of adsorption. The optimal parameters obtained for maximum Pb(II) ions adsorption were at pH = 6.31, initial Pb(II) ion = 43.79 mg/L, contact time = 119.51 minutes and temperature = 59.67 o C. The experimental and predicted values were found to be in good agreement with each other.

Water Quality, Exposure and Health, Nov 9, 2013

ABSTRACT Environmental water samples contain wide range of contaminants including heavy metal ion... more ABSTRACT Environmental water samples contain wide range of contaminants including heavy metal ions that are required only in trace amount. Excessive level of metal ions in water may be detrimental to health and environment. Heavy metal poisoning has been a serious concern all over the globe. Heavy metals are well known to be non-biodegradable and tend to bio-accumulate at various concentrations. A number of methods have been proposed to remove heavy metal ions from water and among them adsorption is one of the best methods. Cadmium has been identified as one of the toxic heavy metals that enters the water through disposal of waste from industries. The increasing technological use of cadmium has raised the concern for its removal from water/wastewater. This review article provides an overview of use of nano-metal oxides as adsorbents for removal of cadmium from water/wastewater. This study involves the identification of environmentally friendly, low-cost and efficient nano-metal oxide sorbents for water/wastewater purification. A detailed comparison of reported nano-metal oxide sorbents has been done in order to rank them and to predict the knowledge gaps in this area.

IntechOpen eBooks, Aug 19, 2020

World is facing scarcity of pure and safe drinkable water and third world war would be based on t... more World is facing scarcity of pure and safe drinkable water and third world war would be based on this issue. Recently ground water is excessively used to meet drinking water needs. Water is the principal source of fluoride in daily intake. Excessive fluoride content in ground water due to leaching from fluoride bearing rocks, pose a serious threat worldwide. Concentration of fluoride in drinking water beyond the recommended standards may lead to serious health problems such as skeletal problems, restricted movement, severe anemia and fluorosis. De-fluoridation of water is quite difficult and expensive. Various materials and technologies have been developed to solve this world wide problem. Ion-exchange, precipitation, electro-chemical, reverse osmosis and adsorption are most widely applied methods for de-fluoridation of water. The main highlight of this chapter is to identify and compare carbon-based materials for de-fluoridation of water on the basis of their efficiency, cost and availability. Challenges associated with the development and use of cost effective and environmental friendly materials for de-fluoridation of water have also been discussed.

Russian Journal of Applied Chemistry, Sep 1, 2022

DESALINATION AND WATER TREATMENT, 2022

Toxin Reviews, Apr 12, 2021

EAI/Springer Innovations in Communication and Computing, 2021

Management and control of pandemic and endemic diseases is one of most important issue in order t... more Management and control of pandemic and endemic diseases is one of most important issue in order to deal with unpredicted health emergencies and fatalities all over the world. Covid-19, a new version of corona virus, originated from the Wuhan province of mainland China somewhere in December 2019 and has spread across the globe. Pandemic Covid-19 has affected the life of humans in almost every region of the world. Different strategies were planned by the regulatory bodies of different countries in order to slow down the transmission rate. The transmission rate was not uniform and varied from region to region. This chapter highlights the transmission dynamics of the virus and monitors the transmission among top five countries with highest number of infected persons as on May 31, 2020 and predicts the situation further. Linear regression techniques have been used for the purpose of analysis and prediction. The prediction model obtained is based on the trend of the data with highest R2value and minimum residual. The model helps the authorities to make necessary arrangements during the emergency.

Advances in environmental engineering and green technologies book series, 2019

Medical diagnosis with the help of computational techniques is a very useful tool for doctors for... more Medical diagnosis with the help of computational techniques is a very useful tool for doctors for the purpose of better diagnosis. In this chapter, an attempt has been made to reduce the number of tests required for diagnosis using generalized fuzzy sets for initial decision making as per the characteristics of ingested water in normal routine. The quality of water in terms of type and concentration of contaminants varies from region to region. The analogy between concentration of different contaminants in drinking water and risk analysis based on intuitionistic fuzzy sets (IFSs) have been investigated. Hypothetical data was processed in view of the finite set of heavy metals, diseases, and places to investigate the effect of selected heavy metal on the human health. The findings will not only help in diagnosis but also offer cost-cutting and ecofriendly strategy by avoiding unnecessary clinical laboratory examinations.

Huge quantities of municipal and industrial wastewater are being generated in our country. Safe d... more Huge quantities of municipal and industrial wastewater are being generated in our country. Safe disposal/reuse of wastewater is necessary to reduce pollution and partially overcome water scarcity. Constructed wetlands are an exciting new application of technology that is very effective in improving water quality. This paper describes various types of constructed wetlands with emphasis on subsurface constructed wetlands, mechanisms involved, in the treatment process alongwith advantages and limitations. A few case studies have also been presented. The results of these studies prove that high degree of purification from domestic as well as industrial wastewater can be achieved by using this technique. These systems have great scope in developing countries due to their low cost, minimum maintenance and high efficiency.

Oriental Journal of Chemistry/Oriental journal of chemistry, Jun 27, 2024