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RISS 인기검색어
- 검색키워드
- 저자 : Vasanthakumar Sathyaselvabala (검색결과 2 건)
- 무료
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Removal of cadmium(II) from aqueous solution by agricultural waste cashew nut shell
Ponnusamy Senthil Kumar,Subramanian Sivanesan,Subramaniam Ramalingam,Vasanthakumar Sathyaselvabala,Selvaraj Dinesh Kirupha,Arukkani Murugesan 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.6
Cashew nut shell (CNS) is a low cost adsorbent that has been used for the removal of cadmium(II) from an aqueous solution. The effects of various parameters such as solution pH, CNS concentration, contact time, initial cadmium(II) concentration and temperature were examined. The CNS was effective for the quantitative removal of cadmium(II) ions in acidic conditions and equilibrium was achieved in 30 min. The experimental data were analyzed by two-parameter (Langmuir, Freundlich, Temkin and Dubinin-Radushkevich) and three-parameter models (Redlich-Peterson, Koble-Corrigan, Toth and Sips) by nonlinear regression analysis. The characteristic parameters for each isotherms and related correlation coefficients have been determined by using MATLAB 7.1. Thermodynamic parameters such as ΔGo, ΔHo and ΔSo have also been evaluated, and it was found that the sorption process was feasible, spontaneous and exothermic. Pseudo-first-order, pseudo-second-order, Elovich kinetic and intraparticle diffusion models were selected to follow the adsorption process. The results of the kinetic study show that the adsorption of cadmium(II)could be described by the pseudo-second order equation, suggesting that the adsorption process is presumably chemisorption. A single-stage batch adsorber was designed for different adsorbent dose-to-effluent volume ratios using the Freundlich equation. The results indicate that the cashew nut shell could be used to effectively adsorb cadmium(II)from an aqueous solution.
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Kinetic and equilibrium studies on the biosorption of textile dyes onto Plantago ovata seeds
Subramanian Sivanesan,Manickam Periyaraman Premkumar,Vaidyanathan Vinoth Kumar,Ponnusamy Senthil Kumar,Palanichamy Baskaralingam,Vasanthakumar Sathyaselvabala,Thangaraj Vidhyadevi 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.6
The powdered seeds of Plantago ovata (PSPO) were utilized for the removal of Malachite Green (MG)and Rose Bengal (RB) dyes from aqueous media by batch adsorption. The Fourier transform infra red spectroscopy (FTIR) results showed that both the dyes were adsorbed between the cellulose matrices, and this has been verified from the intensifying and narrowing aromatic C-H bending vibration. The morphology of the dye laden adsorbent was studied by scanning electron microscopy (SEM), which showed that the dyes were adsorbed between the cellulose matrices of the adsorbent. The PSPO was found to be very effective for the removal of MG and RB at pH 7, and equilibrium was attained within 200 min. The kinetic study indicated that the rate limiting step for MG and RB adsorption may be chemisorption and intraparticle diffusion. Adsorption equilibrium data were fitted to Langmuir, Freundlich, Redlich-Peterson and Temkin adsorption isotherms. It is inferred from the equilibrium studies that the adsorption of MG follows the Freundlich isotherm and the adsorption of RB follows the Langmuir isotherm. The maximum monolayer adsorption capacity of the PSPO was found to be 86.23 mg/g for MG and 81.23 mg/g for RB, respectively.
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