Preparation and application of novel chitosan-cellulose composite materials to adsorb Pb(Ⅱ)and Cr(Ⅵ)ions from water  

作　　者：Yangmei Chen Hongxiang Zhu Jianhua Xiong Cunzhi Zhang Yunhua Li 

机构地区：[1]Department of light Industrial and Food Engineering,Guangxi University,Nanning,53004,China [2]Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control,Nanning 530004,China [3]School of Environment,Guangxi University,Nanning,53004,China

出　　处：《Journal of Bioresources and Bioproducts》2017年第4期168-176,共9页生物质资源与工程（英文）

基　　金：Innovation research team of Guangxi Natural Science Foundation (No.2013GXNSFFA019005);the National High Technology Research and Development Program (No.2009AA06A416);Guangxi scientific and technological project (No.14251009)for their financial support.

摘　　要：This paper reported the preparation and application of novel chitosan-cellulose composite absorbents for the adsorption of Pb(II)and Cr(VI)ions in water.First,oxycellulose or dialdehyde cellulose(DAC)was prepared by sodium periodate oxidation of microcrystalline cellulose(MCC).Second,based on the mechanism of the Mannich reaction,a chitosan/cellulose-based adsorbent(TSFCD)was produced through a cross-linking reaction of thiosemicarbazide(TS)with DAC and chitosan(CS),which was designed specifically for the adsorption of Cr^(6+)ions from water.Similarly,another chitosan/cellulose-based adsorbent(DBFCM)was also prepared with 2,5-dithiobiurea(DB)as the cross-linking agent for the adsorption of Pb^(2+)ions in water.The adsorption performance of TSFCD and DBFCM for Cr^(6+)and Pb^(2+)ions,respectively,was investigated under various process conditions.Variables included adsorption temperature,time,initial metal ion concentration,pH,and adsorbent dosage.The adsorption kinetics of TSFCD and DBFCM were studied,and isothermal models were developed.Results showed that the adsorption amount increased with the increase of the reaction time,and reached a maximum at about 300 min for the TSFCD/Cr^(6+)system,and at about 240 min for DBFCM/Pb^(2+)system.The adsorption performance of TSFCD for Cr^(6+)and DBFCM for Pb^(2+)improved at higher temperature,and leveled off at 40℃ and 50℃,respectively.In addition,the removal rate of Cr^(6+)increased from 49.96%to 70.22%when the TSFCD dosage increased from 0.5 g/L to 3.5 g/L.Similarly,the removal rate of Pb^(2+)increased from 22.23%to 99.45%with the increase of DBFCM dosage from 0.5g/L to 5.0g/L.The adsorption processes of Pb^(2+)and Cr^(6+)were in line with the pseudo-second-order kinetic and the Langmuir isothermal model.

关 键 词：CHITOSAN Oxycellulose Adsorption Wastewater Heavy metal ions PB2+ Cr6+ THIOSEMICARBAZIDE 2 5-Dithiobiurea 

分 类 号：O64[理学—物理化学]