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Huang Z.,Northeast Forestry University | Liu S.,Northeast Forestry University | Zhang B.,Northeast Forestry University | Xu L.,CAS Guangzhou Institute of Chemistry | Hu X.,Northeast Forestry University
Carbohydrate Polymers | Year: 2012

A novel β-cyclodextrin-based adsorbent (CDAA) for the removal of Cu 2+ was prepared and characterized. The adsorption capacities of Cu 2+ on CDAA were evaluated under various treatment conditions, including the solution pH, the dosage of the adsorbent, the initial Cu 2+ concentration, and adsorption time. The results indicated that CDAA hydrogel exhibited typically three-dimensional cross-link network structure. There was a significant increase in the adsorption capacity (from 18.93 mg/g to 107.37 mg/g) when the solution pH increased from 2 to 5. The adsorption equilibrium data were fitted and analyzed with Langmuir, Freundlich, Temkin isotherm equations and four adsorption kinetic models. The results suggested that the Freundlich equation model was the best fit with experimental data (R 2 = 0.995). The kinetic equations showed that the adsorption of Cu 2+ on the adsorbent fit different equations for different concentrations of Cu 2+. These results indicate that in the present study, Cu 2+ adsorption onto the adsorbent occurred via ion exchange and chemical interaction mechanisms. © 2012 Elsevier Ltd. All rights reserved. Source

Liu W.-J.,Hefei University of Technology | Zeng F.-X.,Hefei University of Technology | Zeng F.-X.,CAS Guangzhou Institute of Chemistry | Jiang H.,Hefei University of Technology | Zhang X.-S.,Hefei University of Technology
Bioresource Technology | Year: 2011

Bio-chars with high adsorption capacity derived from rice-husks and corncobs were prepared at different retention times (RTs) in a pyrolysis reactor. At a fixed pyrolysis temperature, the pyrolysis RT is a key factor influencing the surface areas and functional group contents of the bio-chars, and further influencing their adsorption capacities. The results indicate that the bio-char prepared at RT of 1.6s exhibits a higher phenol adsorption capacity (589mgg -1) than other bio-chars and many activated carbons reported in the literature. An adsorption mechanism based on acid-base interaction and hydrogen binding between phenol and the functional groups was proposed to elucidate the adsorption process. An economic evaluation of the use of bio-chars as adsorbents was made. © 2011 Elsevier Ltd. Source

Deng L.,Anhui University of Science and Technology | Zhao Y.,Anhui University of Science and Technology | Li J.,Anhui University of Science and Technology | Fu Y.,Anhui University of Science and Technology | And 2 more authors.
ChemSusChem | Year: 2010

LA Lacers: The conversion of levulinic acid (LA) to γ-valerolactone is catalyzed by heterogeneous catalysts without using the external H2. Ru-P/SiO2 has been demonstrated to be a bifunctional catalyst giving a yield of 96 %. Through a two-step process, excellent performance can be achieved in eight recycling runs. Moreover, no hazardous 2-Me-THF is produced during the process. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Wu J.-J.,Sun Yat Sen University | Cao M.-L.,CAS Guangzhou Institute of Chemistry | Ye B.-H.,Sun Yat Sen University
Chemical Communications | Year: 2010

Six possible isomers of mer-[MII(N,N,O-L)2] complex were observed in the solid state, in which spontaneous resolution of S,S-Λ and R,R-Δ enantiomers of mer-[Co(N,N,O-L3)2] was achieved via π-π interactions. © 2010 The Royal Society of Chemistry. Source

Lai D.-M.,Anhui University of Science and Technology | Deng L.,Anhui University of Science and Technology | Li J.,Anhui University of Science and Technology | Liao B.,CAS Guangzhou Institute of Chemistry | And 2 more authors.
ChemSusChem | Year: 2011

The main attraction: A magnetic solid acid with mesoporous structure was synthesized for the hydrolysis cellulose into glucose. Glucose is generated efficiently from amorphous cellulose in the mesopores of the catalyst with a yield of 50 %. Moreover, catalyst separation can be readily achieved by magnetic force. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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