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Mechanisms of mercury ions removal from acid wastewater by SnS2/ α-Al2O3 |
CHEN Li-hong1, XU Hao-miao1, YANG Bo2, LIU Xiao-shuang1, LIU Ping1, QU Zan1, YAN Nai-qiang1 |
1. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Weifang Anjian Safety Technology Consulting Co., Ltd., Weifang 261061, China |
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Abstract Sulfur-based adsorbents had good affinity to mercury when using for mercury ions capture. The SnS2/α-Al2O3 composite was successfully prepared and used as adsorbents for Hg2+ removal. The adsorption experimental results indicated that the maximum adsorption capacity of such composite was 950mg/g. The Hg2+ removal efficiencies were not influenced by pH values. It can achieve nearly 100% mercury removal efficiencies under the pH values of 1~6 (Hg2+:65mg/L). In addition, the coexisting metal ions (Cd2+, Cr3+, Zn2+, Cu2+, Pb2+, Ni2+, Co2+) had no significant influences on mercury adsorption rate and efficiencies (Hg2+:1mmol/L). Therefore, it confirmed that SnS2/α-Al2O3 composite had a good stability under acidic condition. The adsorption process followed a monolayer chemical adsorption mechanism. Moreover, the composite can be regenerated and recycled using a hydrochloric acid treatment method.
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Received: 12 January 2019
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