黄铁矿表面氰根离子的吸附规律研究

Research on Adsorption Rule of Cyanide Ions on the Pyrite Surface

以黄铁矿为吸附剂、CN-为吸附质,考察了吸附时间、溶液pH值、黄铁矿用量等因素对吸附效果的影响,同时采用红外光谱检测法分析了黄铁矿表面吸附CN-前后的差异,并对吸附结果进行了Langmuir吸附模型拟合。结果表明,黄铁矿对氰化钠的吸附很快,1 min即达到吸附平衡,最大吸附负载达3.81 mg/g,吸附受pH影响很小;氰根离子与黄铁矿有很强的键合吸附作用;黄铁矿颗粒对氰根离子的吸附是以单分子层化学吸附为主的吸附过程。

With pyrite as adsorbent and CN- as adsorbate, the impact of adsorption time, solution pH value, dosage of pyrite on adsorption effect are investigated. Meanwhile, the infrared spectroscopy detection method is adopted to analyze the difference before or after CN- absorption on pyrite surface, and adsorption results are fitted with Langmair adsorption model. The results show that pyrite quickly adsorbs sodium cyanide and reach balance after 1 mn with the maximum adsorption load up to 3.81 mg/g. pH has little influence on adsorption of cyanide ion by pyrite; Cyanide ion have a strong bonding adsorption action with pyrite. Adsorption of Pyrite particles to cyanide ion is a monomolecular chemical adsorption process.