" STUDY ON ADSORPTION EFFICIENCY OF NEEM LEAVES POWDER IN REMOVAL OF REACTIVE RED DYE COLOR FROM AQUEOUS SOLUTION " (original) (raw)
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A low cost absorbent prepared from neem leaves for the removal of congo red dye from aqueous solution has been studied. Experiments in batch reactor were carried out to study the removal efficiency of neem leaves towards the adsorption of congo red dye (adsorbate) by stirring it with neem leaves powder (adsorbent). Kinetics study of adsorption and equilibrium studies were carried out by varying different parameters like size of the adsorbent particles, initial concentration of dye and the adsorbent dosage. An adsorption rate model has been developed. The experimental data have also been studied in light of Langmuir and Fruendlich. Adsorption equilibrium data fit most satisfactorily to Langmuir adsorption isotherm.
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The regular commercial activated carbon is expensive, so there is a need of alternatives for such application. In present study Neem leaves powder activated using chemical treatment as a low-cost adsorbent. And experiment has done with different weight of adsorbent. The potential of Neem leaves powder adsorbent to remove color impurities from industrial effluent is good. Adsorption isotherm of color solution on adsorbent were determine and correlation with common isotherm equations such as Freundlich Isotherm and Langmuir isotherm model. The maximum removal efficiency was observed up to 80% from prepared Neem leaves at optimum value of parameter. Industrial effluents, dyes from textile industry are common water pollutants and they may be frequently found in trace quantities in industrial waste water so treatment can be done using this adsorbent. Adsorption has been used successfully in the removal of color from effluents. This adsorbent as local replacement for existing commercial adsorbent materials.
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Dyes are present in mixture form in various Industrial and domestic effluents. The objective of this work is to study of adsorption of dye solution malachite green using neem leaf powder. Liquid phase adsorption experiments were conducted. Batch adsorption studies are carried out by observing the effect of experimental parameters, namely amount of adsorbents, dye concentrations and contact time. Optimum conditions for dye removal are studied like contact time required, amount of adsorbent and dye concentration. Spectrophotometric technique was used for the measurement of concentration of dye before and after adsorption. Neem leaves were shown to be promising materials for adsorption removal of dye from aqueous solutions. The equilibrium time was found to be 15-20 min for maximum removal of 90-95% was obtained for an adsorbent dose of 0.3 g at 2.5×10 -5 mg/L dye concentration. The results generated by this work can be used for determination of optimum conditions for adsorption of dye...
Azadirachta indica (neem) leaf powder was used as an adsorbent for the removal of textile dye from aqueous solution. The adsorption of dye on A. indica was found to be dependent on contact time, dye concentration and amount of adsorbent. Spectrophotometric technique was used for the measurement of concentration of dye before and after adsorption. The removal data were fitted on Langmuir and Freundlich adsorption isotherm equations. The values of their corresponding constants were determined from the slope and intercepts of their respective plots. The adsorption isotherm data will employ to calculate the thermodynamic parameters like (∆G) Gibb's free energy, (∆H) change in enthalpy and (∆S) entropy. The values of percent removal and K D for Fast green dye on neem leaf powder was also calculated at temperatures ranging from 303-318 K.
3rd International Conference on Biological, Chemical and Environmental Sciences (BCES-2015) Sept. 21-22, 2015 Kuala Lumpur (Malaysia), 2015
Neem leaves were studied as plant wastes derived adsorbents for detoxification of Congo Red (CR) and Methyl Orange (MO) from aqueous solutions using batch adsorption technique. The objectives involved determining the effects of the basic adsorption parameters namely, agitation time, adsorbent dosage, adsorbents particle size, adsorbate loading concentrations and initial pH, on the adsorption process as well as characterizing the adsorbents by determining their physicochemical properties, functional groups responsible for the adsorption process using Fourier Transform Infrared (FTIR) spectroscopy and surface morphology using scanning electron microscopy (SEM) coupled with energy dispersive Xray spectroscopy (EDS). The adsorption behaviours of the materials were tested against Langmuir, Freundlich, Temkin, Dubinin Radushkevic and Harkins Jura isotherm models. Percent adsorption increased with increase in agitation time (5-240 minutes), adsorbent dosage (100-500mg), initial concentration (100-300mg/L), and with decrease in particle size (≥75μm to ≤300μm) of the adsorbents. Both processes are dye pH-dependent, increasing or decreasing percent adsorption in acidic (2-6) or alkaline (8-12) range over the studied pH (2-12) range. From the experimental data the Langmuir's separation factor (R L) suggests unfavourable adsorption for all processes, Freundlich constant (n F) indicates unfavourable process for CR and MO adsorption; while the mean free energy of adsorption , calculated from Dubinin-Radushkevich equation suggest a physical adsorption. Reduction in band intensities and vibrational changes observed in FTIR spectra indicate possible involvement of carbonyl (-C=O), carboxyl (-COOH) and hydroxyl (-OH) functional groups on the adsorbents' surfaces during the adsorption and interaction with the sulfonic acid groups (-SO 3 Na) on the dye molecules. The difference in irregular and porous texture surface morphology of fresh and dyeloaded adsorbent characterized the adsorption of the dyes by the adsorbent. While EDS analysis indicates that adsorbent consist of mainly C and O, and small amounts of, Ca, Mg, K, P and S. The result of this study shows that neem leaves are potential alternative low-cost adsorbents for the effective removal of Congo red (CR) and methyl orange (MO), from aqueous solutions.
Removal of Direct Red Dye Using Neem Leaf Litter
The adsorption of Congo red (CR) onto carbon prepared from Neem leaf litter (NLLC) and Raw Neem Leaf Litter (RNLL) was investigated. The CR adsorption increased with an increase in pH of the CR solution in high acidic region and then decreased for NLLC, and for RNLL it slightly increased but rapidly decreased in neutral pH region but with further increase in pH, increased rapidly again. The Langmuir isotherm model showed a good fit with the equilibrium experimental data and the values of the heterogeneity factor (n) indicated heterogeneous adsorption of CR onto both RNLL and NLLC. The kinetic data showed better fit to the pseudo second-order rate model than to the pseudo first-order rate model in both cases. The adsorption of Neem leaf litter carbon (NLLC) showed the higher adsorption capacities of CR compared to Raw Neem Leaf Litter (RNLL) and any other adsorbents and would be a good method to increase adsorption efficiency for the removal of anionic dyes in a wastewater treatment process. Background: Wastewater effluents from different industries such as textiles, rubber, paper and plastics, contain several kinds of synthetic dyestuffs [1]. Further, discharging even a small amount of dye into water can affect aquatic life and food webs due to the carcinogenic and mutagenic effects of synthetic dyes [2]. Congo red [1-naphthalene sulfonic acid, 3, 30-(4, 40-biphenylenebis (azo)) bis (4-amino-) disodium salt] is a benzidine-based dye. This dye has been known to cause an allergic reaction and to be metabolized to benzidine, a human carcinogen. Adsorption is quite popular due to simplicity and high efficiency, as well as the availability of a wide range of adsorbents. It has proved to be an effective method for removal of dye from wastewater [3].