Browsing by Author "Umadevi, S"
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Item Adsorption of Selected Textile Dyes onto Chemically Activated Carbon Adsorbents Prepared Using Waste Biomass Bauhinia racemosa Fruit Pods(2019-05) Umadevi, S; Renugadevi, NItem Influence of Cow Manure And Azolla On The Growth And Yield Of Cluster Bean (Cyamopsis Tetragonoloba (L.) Taub. Var, Pusa Navbahar)(2004-08) Umadevi, S; Rita JosephItem 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, SIn 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.Item Kyenitic Studies of Acid Blue 110 Dye Removal Using Activated Carbon Prepared from Ripened Bauheniaracemosa Seed Pod(2016) Umadevi, S; Renukadevi, NInthe present work adsorption studies of Acid bluellO dye onloBauheniaRacemosa seed pod carbon has been studied in a batch system. The effect of concentration of the dye solution, adsorbent dosage, contact time, pH and temperature on the adsorption process was examined and the optimum experimental conditions were identified. The maximum removal of dye was obtained at pH 2. The percentage removal of the dye decreased with an increase in initial concentration. Though the R" values of pseudo first and second order rate equations are very nearer to each other the qe values are in close agreement with second order reaction.