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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.
Thangaraj Vidhyadevi,Murugesan Arukkani,Kalaivani Selvaraj,Premkumar Manickam Periyaraman,Ravikumar Lingam,Sivanesan Subramanian 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
Poly(chlorobenzalimino thiourea amide) (PCBA) resin was synthesized by using the phosphorilation polycondensation method. PCBA was characterized by analytical techniques, and it was used for the adsorption of heavymetals (Ni2+ and Zn2+) and anionic dyes (methyl orange (MO) and acid orange (AO)). The variables which affect theadsorption efficiency, such as pH, adsorbate concentration, adsorbent dose and contact time were studied. The resultsshow that the adsorption of Ni2+, Zn2+, MO and AO follows the pseudo-second order kinetic model. The maximummonolayer adsorption capacity of PCBA for Ni2+, Zn2+, MO and AO, calculated using Langmuir isotherm is 191.2,247.1, 153.8, 149mg/g, respectively. Surface area (21.1m2/g) and crystal size are 21.1m2/g and 0.35 nm, respectively. High efficiency of the polymeric resins may be due to their amorphous nature and the presence of strong binding sitesin the polymer structure. Thermodynamic parameters such as change in standard free energy change, enthalpy andentropy ΔGo, ΔHo and ΔSo were evaluated, and the adsorption process was found to be feasible, exothermic and spontaneous. Desorption studies show that adsorption efficiency of PCBA was retained even after four cycles.