Potential of Neem Leaf Powder as Bio Adsorbents for Dye Colour Removal (original) (raw)
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Reactive Dyes are low Bio Degradable in nature. The objective of this work is the study of adsorption of Reactive Dye using low cost adsorbents. In this article adsorption process has been adopted and studied by using Neem leaves. The use of Natural alternative adsorbent is found very effective in treatment of removal of Reactive Red dye. The optimum conditions like dye concentration, adsorbent dosage, time period for color removal are studied. Spectrometric method is used in identification of concentration of dye .The removal efficiency were fitted for Freundlich and Langmuir isotherm adsorption equations .which shows favorable condition for dye removal.
Adsorption of Congo Red Dye from Aqueous Solutions using Neem Leaves as Adsorbent
2008
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.
Adsorption characteristics of the dye, Brilliant Green, on Neem leaf powder
Dyes and Pigments, 2003
A novel adsorbent was developed from mature leaves of natural Neem trees for removing dyes from water. The adsorbent, in the form of fine powder, was found to be very effective in removing the dye, Brilliant Green, from aqueous solution. The adsorption process was carried out in a batch process with different concentrations of the aqueous dye solution as well as with different adsorbent doses, at a range of pH values and temperature. The suitability of the adsorbent was tested by fitting the adsorption data with Langmuir and Freundlich isotherms and by computing equilibrium thermodynamic and kinetic parameters, the values of which showed the Neem leaf powder as a promising adsorbent for dyes in aqueous solution. #
ADSORPTION OF COLOR FROM A STOCK SOLUTION USING NEEM LEAVES POWDER AS A LOW-COST ADSORBENT
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.
Adsorption of Malachite Green Dye from Aqueous Solution on Neem Leaf Powder
Pollution Research
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...
A Comparitive Study of Adsorption Behaviour of a Dye Using Agro Wastes as Adsorbents
The use of cheap and eco-friendly adsorbents are studied as an alternative substitution of activated carbon for the removal of dyes from wastewater. Laboratory investigations were done to find the potential of Rice husk ash(RHA), Activated Rice Husk (ARH) and Azadirecta indica leaves (Neem) powder (NLP )to remove methylene blue dye from aqueous solution . ARH was prepared from rice husk treated with nitric acid and RHA Prepared by heating in muff furnace at 300 0 C. Neem leaves are sundried for few days and then dried at low temperature (<105°C) for 24 hrs in hot air oven to remove moisture content. The effects of various experimental parameters, such as pH , adsorbent dosage and contact time were investigated. Langmuir adsorption isotherm was applied and R 2 value was calculated which shows, Langmuir adsorption is a good fit for the experimental data. The result shows that the 85 % colour removal efficiency can be achieved at the dose of 50 g/l of ARH . 90 % colour removal efficiency is achieved at the adsorbent dose of 40 g/l of RHA. With increase in RHA dose the efficiency increased upto 96 %. 81% of colour removal efficiency is achieved with NLP .
The plant powder of Nirgudi (L. Vitex negudo) were activated with sulphuric acid and used as low cost easily available and renewable biological adsorbent for the removal of acid dyes (Acid blue, Acid red and Malachite green) from aqueous solution. Batch experiments were carried out for adsorption kinetics and isotherms. Operating variable studied were pH, temperature, adsorbent dose, initial concentration of adsorbate. Adsorption capacity seems to be enhanced by increasing temperature, adsorbent dose and for pH. Maximum dye adsorption was found to be in acidic range. Nirgudi Leaf powder (NLP) treated with Sulphuric acid (H 2 SO 4) solution increased the adsorption efficiency upto 80 percent. Experimental adsorption kinetic data were fitted to be Lagergren first order. Equilibrium data were well represented by the Freundlich Langmuir isotherm model for all tested adsorption systems. Beside these the thermodynamic study has showed that the acid dye adsorption onto the surface of Acid Activated Nirgudi Leaf powder (AANLP) was physical adsorption and the process was spontaneous and exothermic.
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.