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Materials 2017, 10(9), 1101; doi:10.3390/ma10091101

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

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.
Received: 9 August 2017 / Revised: 12 September 2017 / Accepted: 13 September 2017 / Published: 19 September 2017
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Abstract

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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