Adsorption of Au（Ⅲ） ions on xanthated crosslinked chitosan resin in hydrochloric acid medium
来源期刊：Rare Metals2021年第3期
论文作者：Miao Zeng Ting-An Zhang Guo-Zhi Lv Zhi-He Dou Yan Liu Ying Zhang
文章页码：743 - 748
摘 要：Xanthated crosslinked chitosan（XCCS） resin prepared under microwave irradiation were used for adsorbing Au（Ⅲ） ions in hydrochloric acid medium.The influence of pH and temperature on the adsorption capacity of XCCS was investigated.The original XCCS and the loaded XCCS were characterized by scanning electron microscope（SEM） and X-ray diffraction（XRD）,respectively.The results indicate that the XCCS has ability to adsorb Au（Ⅲ） ions and the maximum adsorption capacity of Au（Ⅲ） ions on XCCS is observed at pH 1 and 20℃.The data of batch adsorption tests are fitted to kinetic models and isotherm models,respectively.The kinetics of adsorption process is found to follow pseudo-second-order kinetic rate model,and equilibrium data agree very well with the Langmuir model.Thermodynamic calculation of the Au（Ⅲ） ions adsorption process indicates that the adsorption process is spontaneous and endothermic.
Miao Zeng，Ting-An Zhang，Guo-Zhi Lv，Zhi-He Dou，Yan Liu，Ying Zhang
Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education,School of Materials and Metallurgy,Northeastern University
摘 要：Xanthated crosslinked chitosan（XCCS） resin prepared under microwave irradiation were used for adsorbing Au（Ⅲ） ions in hydrochloric acid medium.The influence of pH and temperature on the adsorption capacity of XCCS was investigated.The original XCCS and the loaded XCCS were characterized by scanning electron microscope（SEM） and X-ray diffraction（XRD）,respectively.The results indicate that the XCCS has ability to adsorb Au（Ⅲ） ions and the maximum adsorption capacity of Au（Ⅲ） ions on XCCS is observed at pH 1 and 20℃.The data of batch adsorption tests are fitted to kinetic models and isotherm models,respectively.The kinetics of adsorption process is found to follow pseudo-second-order kinetic rate model,and equilibrium data agree very well with the Langmuir model.Thermodynamic calculation of the Au（Ⅲ） ions adsorption process indicates that the adsorption process is spontaneous and endothermic.
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