【摘要】 基于硫化物与汞亲和性较强的特性,构建了SnS₂/α-Al₂O₃复合型除汞吸附剂材料.实验结果表明,该复合材料对Hg²⁺的最大吸附容量可达950mg/g,其吸附效果不受pH值（酸性pH=1～6）影响,汞浓度为65mg/L时,均能达到近100%的汞去除效率.同时,吸附过程不会受其他金属离子(Cd²⁺、Cr³⁺、Zn²⁺、Cu²⁺、Pb²⁺、Ni²⁺、Co²⁺等)的强烈干扰,汞浓度为1mmol/L条件下,汞的去除速率及效率均未有很大差距.吸附过程未有大量Sn²⁺析出,证明了该复合材料的酸性稳定性.通过吸附动力学以及吸附机制研究表明,该吸附过程为单层化学吸附.通过盐酸溶液浸泡洗涤,可以实现SnS₂/α-Al₂O₃复合材料的再生和循环使用.更多还原

【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 950 mg/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⁺: 65 mg/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⁺: 1 mmol/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.更多还原