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Munagapati, Venkata Subbaiah,Kim, Dong-Su Elsevier 2016 Journal of molecular liquids Vol.220 No.-
<P><B>Abstract</B></P> <P>This study investigated the adsorption of Congo Red (CR), an anionic azo dye, from aqueous solution by using Cationic Modified Orange Peel Powder (CMOPP). The optimum conditions were determined by investigating the effects of pH, contact time, initial dye concentration and temperature. The adsorbent was characterized by FTIR analysis. The equilibrium data were analyzed using Langmuir and Freundlich isotherm models. The maximum adsorption capacity of CR on CMOPP was estimated as 107, 144, and 163mg/g, respectively, at different temperatures (298, 308 and 318K). Langmuir model fitted the equilibrium data better than the Freundlich isotherm. The kinetic results demonstrated that the adsorption of CR onto CMOPP was well described by pseudo-second-order kinetic model. The activation energy of adsorption (<I>E</I> <SUB> <I>a</I> </SUB>) was found to be 30kJ/mol by using the Arrhenius equation. The calculated thermodynamic parameters (<I>ΔG</I> <SUP> <I>o</I> </SUP>, <I>ΔH</I> <SUP> <I>o</I> </SUP> and <I>ΔS</I> <SUP> <I>o</I> </SUP>) showed that the adsorption of CR onto CMOPP was feasible, spontaneous and endothermic. Desorption experiments were carried out to explore the feasibility of regenerating the adsorbent and the adsorbed CR from CMOPP was desorbed using 0.1M NaOH. The results indicated that CMOPP can be considered as a potential adsorbent for the removal of CR from aqueous media.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We used CMOPP which is an efficient and specific adsorbent for the removal of CR. </LI> <LI> Adsorption equilibrium follows pseudo-second-order model. </LI> <LI> Equilibrium data were well described by the Langmuir isotherm model. </LI> <LI> Thermodynamic study showed that the CR adsorption is endothermic and spontaneous. </LI> <LI> The adsorbent could be regenerated and repeatedly used for CR removal. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
입상 활성탄을 이용한 RB5수용액 흡착 반응의 동역학, 열역학, 그리고 등온선 연구
( Venkata Subbaiah Munagapati ),강지원 ( Ji-won Kang ),박은규 ( Eun-gyu Park ),김동수 ( Dong-su Kim ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.5
Present research discussed the utilization of granular activated carbon (GAC) as an adsorbent for Reactive black 5 (RB5) removal from aqueous solution. Batch adsorption experiments were carried to evaluate the influence of pH, adsorbent dosage, contact time, initial dye concentration and temperature. The equilibrium data were analyzed using the Langmuir and Freundlich isotherm models. Experimental data were best represented by the Langmuir isotherm model. The maximum monolayer adsorption capacity of RB5 onto GAC was found to be 32.02 ㎎/g. The pseudo-second-order kinetic model adequately described the kinetic data. Thermodynamic parameters (Δ Go, ΔHo and ΔSo) suggest that the adsorption process was spontaneous and endothermic in nature. Results in this study suggested that GAC was a suitable material for the removal of RB5 in aqueous solution.
Munagapati Venkata Subbaiah,YEOUNG-SANG YUN 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.2
This study investigates the equilibrium, kinetics and thermodynamics of Nickel(II) biosorption from aqueous solution by the fungal mat of Trametes versicolor (rainbow) biomass. The optimum biosorption conditions like pH, contact time, biomass dosage, initial metal ion concentration and temperaturewere determined in the batch method. The biosorbent was characterized by FTIR, SEM and BET surface area analysis. The experimental data were analyzed in terms of pseudo-first-order, pseudo-secondorder and intraparticle diffusion kinetic models, further it was observed that the biosorption process of Ni(II)ions closely followed pseudo-second-order kinetics. The equilibrium data of Ni(II) ions at 303, 313, and 323 K were fitted to the Langmuir and Freundlich isotherm models. Langmuir isotherm provided a better fit to the equilibrium data andthe maximum monolayer biosorption capacity of the T. versicolor(rainbow) biomass for Ni(II) was 212.5 mg/g at pH 4.0. The calculated thermodynamic parameters, ΔGo,ΔHo, and ΔSo, demonstrated that the biosorption of Ni(II)ions onto the T. versicolor (rainbow) biomass was feasible,spontaneous and endothermic at 303 ~ 323 K. The performance of the proposed fungal biosorbent was also compared with that of many other reported sorbents for Nickel(II)removal and it was observed that the proposed biosorbent is effective in terms of its high sorption capacity.
Jianyou Long,Gutha Yuvaraja,Shuyi Zhou,Jianying Mo,Huosheng Li,Dinggui Luo,Di Yun Chen,Lingjun Kong,Munagapati Venkata Subbaiah,Guda Mallikarjuna Reddy 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
In this study, two Fusarium strains namely ZSY and MJY were successfully isolated from the contaminatedsoil of Dabaoshan smelter in Shaoguan City, and utilised as a biosorbent for the removal of Pb(II) ions fromaqueous solution. Effect of pH (6), agitation speed (150 rpm), biomass concentration (1 g/L), initial Pb(II)concentration, contact time (60 min), and effect of temperature (323 K) was investigated. Kinetic andisotherm results showed that the removal of Pb(II) ions onto ZSY and MJY werefitted well with thepseudo-second-order and Langmuir isotherm models (232.56 and 263.16 mg/g). In addition thermodynamicstudies were also discussed.