Characteristics of Cr(VI) removal by cross-linked chitosan/tartaric acid modified Pleurotus ostreatus composite adsorbent
WANG Shu-fan1,2, XU Wei-hua1,2, LIU Yun-guo1,2, LI Xin1,2, ZHANG Wei1,2
1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; 2. Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Changsha 410082, China
Abstract：Chitosan-Pleurotus ostreatus composite adsorbent (CMPOD) was prepared by using chitosan and tartaric acid modified Pleurotus ostreatus, and applied for Cr(VI) removal from solutions. The results showed that Cr(VI) adsorption capacity decreased with the increase of pH value in the pH range of 2~10. Cr(VI) adsorption capacity increased with the increase of initial Cr(VI) concentration and temperature. The adsorption capacity reached over 190mg/g for 600mg/L Cr(VI) at 50℃. The adsorption process followed the pseudo-second-order kinetic model and Freundlich isotherm. Thermodynamic analysis showed that the adsorption process was spontaneous and endothermic. An abundant web structure was observed in the adsorbent by SEM. The pores in the web structure were filled and Cr(VI) peak appeared in EDS spectra after Cr(VI) adsorption. FTIR spectra demonstrated that amino group in chitosan was introduced into the adsorbent and was the dominant group for Cr(VI) adsorption.
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