naa a22 4500 510819052 CHVBK 20180411083522.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s11814-012-0096-y doi (NATIONALLICENCE)springer-10.1007/s11814-012-0096-y Characterization of modified sawdust, kinetic and equilibrium study about methylene blue adsorption in batch mode [Elektronische Daten] [Weihua Zou, Hongjuan Bai, Shuaipeng Gao, Ke Li] Methylene blue (MB) biosorption by citric acid modified pine sawdust (Pinus tabulaeformis) was studied from aqueous solutions. Batch experiments were conducted to determine the biosorption properties of the biomass. The Langmuir isotherm equation could fit the equilibrium data. The maximal equilibrium quantity of MB from Langmuir model was 111.46 mg g−1 at 293 K. The Elovich model adequately described the kinetic data in comparison to the pseudo-first-order model and pseudo-second-order model; the process involving rate-controlling step is very complex involving both boundary layer and intra-particle diffusion processes. The effective diffusion parameter D i and D f values were estimated at different initial concentration, and the average values were determined to be 5.76×10−8 and 2.12× 10−7 cm2 s−1. Thermodynamic parameters showed that the adsorption of methylene blue onto pine sawdust biomass was feasible, spontaneous and endothermic under studied conditions. The physical and chemical properties of the biosorbent were determined by SEM, TG-DSC, XRD, and the point of zero charge (pH pzc ) and the nature of biomass-dye interactions were evaluated by FTIR analysis, which showed the participation of COOH, OH and NH2 groups in the biosorption process. Biosorbents could be regenerated using 0.01 mol L−1 HCl solution at least three cycles, with up to 90% recovery. Thus, the biomass used in this work proved to be effective for the treatment of MB bearing aqueous solutions. Korean Institute of Chemical Engineers, Seoul, Korea, 2012 Adsorption nationallicence Modified Sawdust (CAMS) nationallicence Methylene Blue (MB) nationallicence Adsorption Kinetics nationallicence Equilibrium nationallicence Mechanisms nationallicence Zou Weihua School of Chemical Engineering and Energy, Zhengzhou University, 100# of Kexue Road, 450001, Zhengzhou, P. R. China aut Bai Hongjuan School of Chemical Engineering and Energy, Zhengzhou University, 100# of Kexue Road, 450001, Zhengzhou, P. R. China aut Gao Shuaipeng School of Chemical Engineering and Energy, Zhengzhou University, 100# of Kexue Road, 450001, Zhengzhou, P. R. China aut Li Ke School of Chemical Engineering and Energy, Zhengzhou University, 100# of Kexue Road, 450001, Zhengzhou, P. R. China aut Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/1(2013-01-01), 111-122 0256-1115 30:1<111 2013 30 11814 https://doi.org/10.1007/s11814-012-0096-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11814-012-0096-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zou Weihua School of Chemical Engineering and Energy, Zhengzhou University, 100# of Kexue Road, 450001, Zhengzhou, P. R. China aut NATIONALLICENCE 700 1- Bai Hongjuan School of Chemical Engineering and Energy, Zhengzhou University, 100# of Kexue Road, 450001, Zhengzhou, P. R. China aut NATIONALLICENCE 700 1- Gao Shuaipeng School of Chemical Engineering and Energy, Zhengzhou University, 100# of Kexue Road, 450001, Zhengzhou, P. R. China aut NATIONALLICENCE 700 1- Li Ke School of Chemical Engineering and Energy, Zhengzhou University, 100# of Kexue Road, 450001, Zhengzhou, P. R. China aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/1(2013-01-01), 111-122 0256-1115 30:1<111 2013 30 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer