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Open AccessArticle

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

by Yan Shi 1, Ken Sun 1, Lixin Huo 1, Xiuxiu Li 2, Xuebin Qi 3,* and Zhaohui Li 4,*
1
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
2
Henan Province key Laboratory of Water-Saving Agriculture, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
3
Farmland Irrigation Research Institute, CAAS, Xinxiang 453002, China
4
Geosciences Department, University of Wisconsin—Parkside, Kenosha, WI 53144, USA
*
Authors to whom correspondence should be addressed.
Materials 2017, 10(9), 1101; https://doi.org/10.3390/ma10091101
Received: 9 August 2017 / Revised: 12 September 2017 / Accepted: 13 September 2017 / Published: 19 September 2017
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. View Full-Text
Keywords: cadmium; chitosan; modification; 13X molecular sieve; removal cadmium; chitosan; modification; 13X molecular sieve; removal
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MDPI and ACS Style

Shi, Y.; Sun, K.; Huo, L.; Li, X.; Qi, X.; Li, Z. Modification of 13X Molecular Sieve by Chitosan for Adsorptive Removal of Cadmium from Simulated Wastewater. Materials 2017, 10, 1101.

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