Browsing by Author "Renugadevi, N"

Now showing 1 - 20 of 41
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    Adsorption of Chromium (VI) From Aqueous Solution Using Activated Carbon From the Pods of Wood Apple
    (2010) Lalitha, P; Renugadevi, N
    In this study activated carbon from pods of wood apple, an agro waste has been used as an adsorbent for removal of Cr (VI) from aqueous solutions. Parameters, such as adsprbent dosage, concentration of the adsorbate, contact time, and pH were optimized with regard to Cr (VI) removal using the selected adsorbent. To analyze the efficiency of the activated carbon from wood apple (ACW) the experiments were also conducted with commercial activated carbon (ACC) and the result compared. The adsorption of Cr (VI) was found to be concentration and pH dependent. Percentage removal of Cr (VI) increased with decrease in pH and increase in adsorbent dosage for both ACC and ACW. On applying the adsorption data to Langmuir equation, linear plots of 1/Ce vs x/m obtained shows that the adsorption of Cr (VI) using activated carbon prepared from the pod of wood apple and commercially activated carbon followed Langmuir adsorption isotherm. Thus adsorption technique using activated carbon from agro wastes, like pods of wood apple is found to be an efficient method for the removal of heavy metals, like Cr (VI) from aqueous solutions.
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    Adsorption of Maiachite Green Using a Low-Cost Activated Carbon Prepared From Cassia Fstuaf
    (2011) Lalitha, P; Renugadevi, N
    in the present study the efficiency of the carbon adsorbent prepared from the Cassia fistula seeds was tested for the removal of malachite green dye from aqueous solution. The parameters, such as pH, adsorbent dosage and initial dye concentration were systematically evaluated. It is an N- methylated diaminotriphenyl methane dye widely used for colouring purpose and highly cytotoxic to mammalian cells. The percentage removal of malachite green increased with concentration of the dye solution. Nearly 40% adsorption was noted at pH 10 in 180 min of contact time at initial concentration of 4 0 0 mg/L with 3 0 0 mg of the low-cost adsorbent. Removal of malachite green increased from 2 4 .0 5 to 2 8 .2 3% with increasing adsorbent dosage from 3 0 0 to 600 mg in 180 min of agitation time, using 100 mL of dye solution of initial concentration of 4 0 0 mg/L. Langmiur adsorption isotherm plots and Freundlich adsorption isotherm plots were linear showing the applicability of the isotherms for malachite green adsorption.
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    Concept of Waste to Wealth - A Study on Alcohol Industry
    (1998-04) Jhansi Pradhiba, K S; Renugadevi, N
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    Efficacy of Low-Cost Carbon Adsorbents in the Removal of Malachite Green Dye
    (2018-04) Krishnakumari, K; Renugadevi, N
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    Equillibrium Modelling of Adsorptive Removal of Methylene Blue using BGA
    (2012) Renugadevi, N
    The removal of Methylene Blue dye from aqueous solution using a biowaste, dried Blue ***■ Green Algae was investigated in terms of variation of initial concentration of the dye solution, ‘ adsorbent dosage and pH. The optimum pH lor the removal of dye by adsorption was found to be . pH 7. The data obtained in this study fitted with Langmuir and Freundlich adsorption isotherms. The experimental data confirms the monolayer adsorption capacity of the adsorbent.
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    Hexavalent Chromium Removal Using A Low-Cost Activated Carbon Adsorbent From Areca Catechu
    (2011) Lalitha, P; Renugadevi, N
    Removal of heavy metals from industrial wastewater is of primary importance because they are not only causing contamination of water bodies and are also toxic to many life forms. In recent years various heavy metals are removed from solution using natural low cost adsorbents which are economically viable. The present study is aimed at removing hexavalent chromium from aqueous solution using activated carbon from Areca catechu. The effect of variation of initial concentration of Cr (VI) solution, variation of pH and dosage of adsorbent on the adsorption potential of Cr(VI) have been studied. The results of the study have been interpreted in terms of Langmuir adsorption isotherm and Freundlich adsorption isotherm. The adsorption of Cr (VI) onto activated carbon from Areca catechu was found to be concentration dependent. The maximum removal of Cr (VI) was observed at pH 2. The adsorption Cr(VI) using activated carbon prepared from the Areca catechu shell followed Langmuir and Freundlich adsorption isotherms.
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    Ihermodynaniscs of Chromium (Vi) Removal From Aqueous Solution by Adsorption Technique Using Activated Carbon From Pods of Wood Apple and Commercicilly Available Carbon
    (2010) Lalitha, P; Renugadevi, N
    In this study activated carbon from pods of woodappie, an agro waste has been used as at) adsorbent for removal of Cr(VI) from aqueous solutions. To analyze the efficiency of the activated carbon from woodappie (ACW) the experiments were also conducted with commercial activated carbon (ACC) and the results compared. The adsorption of Cr (VI) was carried out by varying the temperature and agitation time at two different pH . The negative value of free energy change (AG) and enthalpy (AH) show the spontaneous and exothermic nature of adsorption of Cr (VI) with respect to both the adsorbents used in this study .The positive value of entropy change (AS) indicate some structural changes in the adsorbate and the adsorbent and increased randomness during adsorption.
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    Kinetic and Thermodynamic Studies of Adsorption of Crystal Violet Dye Using a Low Cost Activated Carbon Prepared from Bauhenia racemosa Seed
    (2015) Renugadevi, N; Umadevi, S
    In this study the efficiency of low cost eco-friendly carbon adsorbent prepared from Bauhenia racemosa seed (BRSC) was analysed for the removal of crystal violet (CV) dye from aqueous solution. Kinetics and thermodynamic parameters of the adsorption of crystal violet dye were evaluated. Adsorption kinetics is an important parameter as it provides significant details, such as reaction pathways and mechanism of the reactions. The adsorption kinetics of crystal violet dye onto Bauhenia racemosa seed followed Pseudo second order reaoon model. The intraparticle diffusion study shows that the rate constant for intraparticle diffusion (K^) increased with increase in initial concentration of crystal violet dye solution. The results of the thermodynamic studies revealed that the adsorption of crystal violet dye onto Bauhenia racemosa seed was spontaneous and endothermic in nature. The positive value of entropy change showed increased randomness during adsorption.
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    Kinetic Modeling of Adsorption of Malachite Green Using a Low-Cost Activated Carbon Obtained From Caesalpinia Pulchemma
    (2011) Lalitha, P; Renugadevi, N
    Malachite green is traditionally used for dyeing cotton, jute, silk, wool leather, etc. Despite its industrial importance, malachite green poses several risks to the consumers. Therefore, ef fect ive removal of malachi te green f rom was tewater is necessary. The present s tudy involves kinetic modeling of the process of adsorption of malachite green from aqueous solution onto a low cost carbon adsorbent prepared f rom Ceasalpinia. Wi th increase in contact time of adsorption f rom 10 to 180 min, the % adsorption was found to increase from ~ 8% to 29% wi th 100 mg/L at pH 2.87 with 300 mg of the adsorbent. The adsorption kinetics of malachite green onto the low-cost adsorbent used in this study fol lowed first er Lagergren rate equation. The intraparticle diffusion study shows that the rate con- __.Its for intraparticle diffusion (K^) increased with the increase in initial concentration of malachite green solution. Intraparticle diffusion is not the sole rate limiting factor for the adsorption of malachite green.
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    Kinetic Modeling of Adsorption of Reniazol Black 5 Dye Using a Low Cost Activated Carbon Obtained from Baiihenia Racemose Seed Pod Carbon
    (2016) Renugadevi, N; Ijmadevi, S
    Adsorption process has been found to he one of the best treatment methods for the removal of dyes from aqueous solution. This study H'05 carried out to examine the adsorption capacity of the low cost adsorbent prepared from ripened Bauhenia racemosa seed pods(BRSP) for the removal of Remazol black 5(RB5) dve from aqueous solution. The influence of contact time, pH, adsorbent dose on the adsorption process was studied. The experimental results indicated that the rate o f adsorption increased rapidly with time and equilibrium was attained within about eighty minutes. The adsorption kinetics of Remazol black 5 onto the low cost adsorbent used in this study followed first order Lagergren kinetic rate equation. The intra particle diffusion study shows that the rate constants for intra particle diffusion (Kp)increased with increase in initial concentration of Remazol black 5 solution.
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    Kinetic Modelling of the Adsorption of Methylene Blue onto Blue Green Algae
    (2012) Renugadevi, N
    The present paper deals with the kinetics o f the adsorption o f Methylene Blue dye from the aqueous solution using dried Blue Green Algae as an adsorbent. The rate constants for the adsorption o f Methylene Blue dye were determined using Lagergren rate equation, Intraparticle diffusion rate equation and Elovich rate equation.
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    Kinetic Studies of Acid Violet Dye Removal using . Blue Green Algae
    (2012) Renugadevi, N
    The present investigation deals with the utilization of Blue Green Algae (BGA) as adsorbent for the removal of Acid Violet from aqueous solution. A series of experiments were conducted in a batch system to evaluate the effect of system variables. Adsorption kinetic data were, tested using Intra-particle diffusion model and Elovich’s equation. Studies revealed that the Intraparticle diffusion played an important role in the mechanism o f dye adsorption.
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    Kinetic Studies on Biosorption of Methyl Violet Dye Using Blue Green Algae
    (2012) Renugadevi, N
    In the present study, the parameters, temperature, adsorbent dose, contact time, adsorbent size and agitation speed were optimized for Methyl violet removal from aqueous medium by using response surface methodology (RSM). The optimum conditions for maximum removal of Methyl Violet from an aqueous solution of 100 mg/L were found as follows: room temperature (33 degrees C), adsorbent dose (500mg), contact time (180 min), adsorbent size (250 meshes) and agitation speed (200 rpm). Adsorption kinetic data were tested using Intraparticle diffusion model and Elovich's equation. Kinetic studies showed that the adsorption follows first order reaction. Studies revealed that the intraparticle diffusion plays an important role in the mechanism of dye adsorption.
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    Kinetics of Malachite Green Adsorption Using A Low-Cost Activated Carbon Prepared From Cassia Fistula
    (2011) Lalitha, P; Renugadevi, N
    The kinetics of the adsorption of a commonly used dye- malachite green onto activated carbon prepared from a economic source namely Cassia fistula has been discussed in this work. The percentage removal of malachite green increases from 24.05 to 28.81 in 180 minutes of contact time when the concentration of the dye solution was varied from 400 to 100 mg/L at pH 2.87 with 300 mg of the adsorbent used in this study. The adsorption of malachite green was found to be time and concentration dependent. The adsorption kinetics of malachite green onto the low-cost adsorbent used in this study followed first order Lagcrgren rate equation. The intraparticlc diffusion study shows that the rate constants for intraparticle diffusion (Kp) increased with the increase in initial coneentration of malachite green solution.