The Effect of Adsorbent Type and Ratio on Removal and Isotherm Adsorption of Methylene Blue (original) (raw)
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Removal of Methylene Blue of Textile Industry Waste with Activated Carbon using Adsorption Method
Reaktor
The colorant that is often used in the textile industry is methylene blue which is a cationic heterocyclic aromatic compound. This compound is very stable and is difficult to decompose naturally leading to environment in large concentrations. Therefore, a waste treatment technology to reduce the concentration of dye waste in water becomes importannt. So far, adsorption method with activated carbon remains the most efficient and effective technique in removing dyes from liquid waste due to its relatively large adsorption capacity. Activated carbon is one of the non-metallic mineral commodities or multipurpose industrial minerals, one of which is as an adsorbent or adsorbent media. This study aims to determine the potential of activated carbon in adsorbing methylene blue with variations in the concentration of methylene blue and particle size of activated carbon. The procedures in this experiment include, the preparation of activated carbon with size variations (20-60, 60-100 and> ...
Korean Journal of Chemical …, 2011
Methylene blue dye was adsorbed on an adsorbent prepared from cashew nut shell. A batch adsorption study was carried out with variable adsorbent amount, initial dye concentration, contact time and pH. Studies showed that the pH of aqueous solutions affected dye removal as a result of removal efficiency increased with increasing solution pH. The experimental data were analyzed by the Langmuir, Freundlich, Redlich-Peterson, Koble-Corrigan, Toth, Temkin, Sips and Dubinin-Radushkevich models of adsorption using MATLAB 7.1. The experimental data yielded excellent fits within the following isotherm order: Redlich-Peterson>Toth>Sips>Koble-Corrigan>Langmuir>Temkin>Dubinin-Radushkevich>Freundlich, based on its correlation coefficient values. Three simplified kinetic models including a pseudofirst-order, pseudo-second-order and intraparticle diffusion equations were selected to follow the adsorption process. It was shown that the adsorption of methylene blue could be described by the pseudo-second-order equation. The results indicate that cashew nut shell activated carbon could be employed as a low cost alternative to commercial activated carbon in the removal of dyes from wastewater.
Experimental Study of Methylene Blue Dye Adsorption Using Cashewnut Shell as an Alternate Adsorbent
Journal of emerging technologies and innovative research, 2017
Colored compounds are the most easily recognizable pollutants in the environment because of their appearance. Most of the industries such as textile, paper, carpet, and printing use dyes and pigments to color their products. Due to their good solubility, synthetic dyes are common water pollutants and they may frequently be found in trace quantities in industrial wastewater. However, the discharge of dye-bearing wastewater into natural streams and rivers possess a severe problem, as dyes impart toxicity to aquatic life and are damaging the aesthetic nature of the environment. However, wastewater containing dyes is very difficult to treat, since the dyes are recalcitrant organic molecules, resistant to aerobic digestion, and are stable to light, heat and oxidizing agents due to their structure and molecular size. Adsorption techniques have gained favor in recent years because of their proven efficiency in the removal of pollutants from effluents too stable for conventional treatment methods. Apart from the high quality product obtained, the processes have proved economically feasible. In many textile processing industries, activated carbon is used as a sorbent to remove dyes in wastewater due to its excellent adsorption ability. For the study presented here Activated carbon (Commercial), Charcoal (Cashew-nut shell) and Charcoal (Wood) were used as an adsorbent. The experimental investigations have been made to find the effect of various parameters on the change in concentration of dye and to find the inexpensive alternative adsorbents in order to decrease the cost of treatment.
The feasibility of using an activated carbon prepared from teak leaf litter and cocoa pod husks (MPAC) to remove methylene blue (MB) from aqueous solution was investigated. The effects of contact time, MPAC dosage, initial concentration, pH and temperature of MB solution were investigated through adsorption equilibrium, isotherm, kinetic and thermodynamic studies. Optimum adsorption of MB from solution occurred at pH 8 and low adsorbent dosages. The physical adsorption process was endothermic and best described by Langmuir isotherm, pseudo-second order kinetic models and liquid film diffusion mechanism. MPAC is a promising adsorbent for removing MB from aqueous solution.
Scientific Reports, 2023
Methylene blue (MB) is abundantly found in textile industrial effluent which can cause severe health problems for public and environmental ecology. Therefore, this study aimed to remove MB from textile wastewater using the activated carbon developed from Rumex abyssinicus. The adsorbent was activated using chemical and thermal methods, and then it was characterized by SEM, FTIR, BET, XRD, and pH zero-point charge (pHpzc). The adsorption isotherm and kinetics were also investigated. The experimental design was composed of four factors at three levels (pH (3, 6, and 9), initial MB concentration (100, 150, and 200 mg/L), adsorbent dosage (20, 40, and 60 mg/100 mL), and contact time (20, 40, and 60 min)). The adsorption interaction was evaluated using response surface methodology. The characterization of a Rumex abyssinicus activated carbon was found to have multiple functional groups (FTIR), an amorphous structure (XRD), crack with ups and down morphology (SEM), pHpzc of 5.03 and a high BET-specific surface area of 2522 m 2 /g. The optimization of MB dye removal was carried out using the Response Surface methodology coupled with the Box Behnken approach. The maximum removal efficiency of 99.9% was recorded at optimum conditions of pH 9, MB concentration of 100 mg/L, the adsorbent dosage of 60 mg/100 mL, and contact time of 60 min. Among the three adsorption isotherm models, the Freundlich isotherm model was the best fit with an experimental value at R 2 0.99 showing the adsorption process was heterogeneous and multilayer whereas the kinetics study revealed that pseudo-second-order at R 2 0.88. Finally, this adsorption process is quite promising to be used at an industrial level. Many textile industries are discharging huge volumes of wastewater into the nearby environment without proper treatment 1. In the textile industry, many processes such as dyeing, finishing, and washing required a lot of water which makes the industry a water-intensive factory 2. The textile industry is known to consume 1000 of the 100,000 types of dyes present in the commercial market. The annual production rate of dyes is estimated to be about 700,000 tons 3. It was also reported that about 700,000 to 800,000 tons of dye with 100,000 distinct compounds are manufactured annually worldwide 4. However, about 15% of the dyes used in industry are eventually released into the environment after being produced and processed 5. Methyl orange, Rhodamine B, methylene blue (MB), Congo red, and Reactive Black-5 are classified into anionic, neutral, and cationic dyes which are among the most widely used dyes in the textile sector 6,7. Dyes are coloring and valuable compounds for industrial products, particularly in textile industries to dye textiles, yarns, plastics, and other substrates. However, they are non-degradable due to chemical intricacy and multiplicity of smearing which results in distracting the environmental system 8. Specifically, MB is a synthetic, heterocyclic aromatic, C 16 H 18 N 3 SCl 319.85 g/ mol, (3,7-bis(dimethylamino) phenothiazine chloride tetra methylthionine chloride), and cationic chemical compound 9. A large quantity of MB is used as a colorant for wool, silk, papers, cosmetics, temporary hair colorants, cotton, textile, food, and pharmaceutical industries 10. MB is known for its antioxidant, cardio-protective,
2013
The use of low-cost, locally available, highly efficient, and eco-friendly adsorbents has been investigated as an ideal alternative to the current expensive methods of removing dyes from waste water. This study investigated the potential use of activated carbon produced from coconutshell for the removal of two dyes viz: Methylene blue and Congo red from textile effluent obtained from Nichemtex Industries Ltd (NCTX) at Ikorodu, Lagos State. The coconut shells were carbonated and used to produce activated carbon using Zinc Chloride as the activating agent. The effects of contact time, pH, adsorbent dose, temperature were investigated for different particle sizes of 1nm, 50nm, and 500nm mesh-sizes for the removal of both dyes (i.e Methylene blue and Congo red) respectively, and the optimal experimental conditions were ascertained. The results showed that as the amount of the adsorbent increased, the degree of adsorption increased accordingly and equilibrium adsorption was attained in 2...
Adsorptive removal of methylene blue dye from soapnut shell pineapple waste derived activated carbon
International Journal of Engineering, Science and Technology, 2021
The methylene blue (MB) adsorption from the aqueous solution on activated charcoal from soapnut shell & pineapple waste were studied in batch mode. The influence of a major parameter determining the efficiency of the process, such as the initial concentration, the adsorbent dose and the contact time on the removal process, was studied. Experimental studies have shown that the adsorption capacity of methylene blue increases with the increase of the adsorbent dose and decreases with the increase of the initial concentration. The equilibrium time of 120 min was observed. The considered optimal dose for removing methylene blue from aqueous solutions from soapnut shell & pineapple waste were 0.6 g & 1g respectively. The equilibrium data corresponds precisely to the Langmuir isotherm.
Dyes and pigments, 2001
The kinetics and mechanism of methylene blue adsorption on commercial activated carbon (CAC) and indigenously prepared activated carbons from bamboo dust, coconut shell, groundnut shell, rice husk, and straw, have been studied. The effects of various experimental parameters have been investigated using a batch adsorption technique to obtain information on treating effluents from the dye industry. The extent of dye removal increased with decrease in the initial concentration of the dye and particle size of the adsorbent and also increased with increase in contact time, amount of adsorbent used and the initial pH of the solution. Adsorption data were modeled using the Freundlich and Langmuir adsorption isotherms and first order kinetic equations. The kinetics of adsorption were found to be first order with regard to intra-particle diffusion rate. The adsorption capacities of indigenous activated carbons have been compared with that of the commercial activated carbon. The results indicate that such carbons could be employed as low cost alternatives to commercial activated carbon in wastewater treatment for the removal of colour and dyes. #
Asian Journal of Chemistry, 2013
The removal of dyes from waste effluents is considered as an environmental need because they can be visible and highly toxic even at very low concentration levels 1. Dyes contaminate environment from various industries, like textiles, paper, cosmetics, printing and foods. Dyes can destroy aquatic life because they prevent sunlight from reching water bottom totally. Also dyes may be mutagenic and/or carcinogenic to human 2. Usually, methylene blue is used for cotton and wood. Methylene blue can cause eye damage for human and animals. On inhalation, it may lead to short periods of rapid or difficult breathing; ingestion may cause nausea and methemoglobinemia 3. Many methods are used to remove colour from industrial effluents such as biological biodegradation 4 and adsorption 5. Many previous works studied the removal of methylene blue using different adsorbent such as coffee husks 6 , yellow passion fruit waste 7 , rice husks 8 , banana peel 9 , cereal chaff 10 , spent coffee grounds 11 , orange peel 9 , wheat shells 12 , durian peel 13 , etc. The application of untreated agricultural or plant waste as adsorbents, in addition to its low adsorption efficiency, may lead to additional organic load in the treated effluent in the form of chemical oxygen demand (COD), biological oxygen demand (BOD) and total organic carbon (TOC) due to release
Study of Effect of Concentration on Adsorption of Methyl Red Dye using different Adsorbents
International Journal for Research in Applied Science and Engineering Technology, 2017
Textile processing industries are now widespread sectors in many developing countries. Among the various processes in the textile industry, dyeing process uses large volume of water for dyeing, fixing and washing processes. Thus, the wastewater generated from the textile processing industries contains suspended solids, high amount of dissolved solids, un-reacted dyestuffs (colour) and other auxiliary chemicals that are used in the various stages of dyeing and processing. The conventional method of textile wastewater treatment consists of chemical coagulation, biological treatment followed by activated carbon adsorption. However, wastewater containing dyes is very difficult and complex to treat, since the dyes are recalcitrant organic molecules, resistant to aerobic digestion, and are stable to light, heat and oxidizing agents due to their molecular structure and size. Adsorption techniques have gained popularity in recent years because of their proven efficiency in the removal of pollutants from Textile industry effluents which are too stable for conventional treatment methods. Apart from the high quality product obtained, the processes have proved economically feasible. In most of the textile processing industries, activated carbon is generally used as aadsorbent to remove dyes in wastewater due to its excellent adsorption ability. For the study presented here Activated carbon (Commercial), Charcoal (Cashew-nut shell) and Charcoal (Wood) were used as an adsorbent. The experimental investigations have been made to find the effect of concentration of dye on adsorption rate of different adsorbents and to find the inexpensive alternative adsorbents in order to minimize the cost of effluent treatment from Textile industry.