Modification of 13X Molecular Sieve by Chitosan for Adsorptive Removal of Cadmium from Simulated Wastewater

Materials

Xuebin Qi¹  Zhaohui Li²  Xiuxiu Li³  Lixin Huo⁴  Ken Sun⁴  Yan Shi⁴ 

[1] Farmland Irrigation Research Institute, CAAS, Xinxiang 453002, China;Geosciences Department, University of Wisconsin—Parkside, Kenosha, WI 53144, USA;Henan Province key Laboratory of Water-Saving Agriculture, North China University of Water Resources and Electric Power, Zhengzhou 450045, China;School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China;

关键词: cadmium;    chitosan;    modification;    13X molecular sieve;    removal;   

DOI  :  10.3390/ma10091101

来源: DOAJ

【 摘 要 】

Chitosan was used to modify a 13X molecular sieve to improve its cadmium removal capability. After being modified with 2% chitosan-acetate for 2 h at 30 °C, significant uptake of Cd2+ could be achieved. The uptake of Cd2+ on the modified 13X molecular sieve followed the Langmuir isotherms with a capacity of 1 mg/g. The kinetics of Cd2+ removal by modified 13X molecular sieve followed a pseudo second-order reaction, suggesting chemisorption or surface complexation. The Cd2+ removal with a sorbent dose of 2 g/L from an initial concentration of 100 μg/L reached more than 95% in 90 min. The equilibrium Cd2+ concentration was <5 μg/L, which meets the requirements of “Standards for Irrigation Water Quality” (GB5084-2005) (10 μg/L) and MCL and MCLG for groundwater and drinking water (5 μg/L) set by United States Environmental Protection Agency.

【 授权许可】

Unknown