蒙脱石对乙基钾黄药-铅复合污染体系的吸附平衡与动力学

来源期刊:中南大学学报(自然科学版)2011年第10期

论文作者:郝艳 吴小莲 莫测辉 李彦文 黄献培 屈相龙 向垒 梁嘉华

文章页码:3213 - 3219

关键词:蒙脱石;黄药;铅;污染控制;吸附等温线;动力学

Key words:montmorillonite; potassium ethyl xanthate; lead; pollution control; adsorption isotherms; kinetics

摘    要:为揭示黄药-重金属复合污染体系的环境行为,以蒙脱石为吸附剂进行静态吸附试验,探讨乙基钾黄药-铅复合污染体系的吸附平衡与动力学特征。研究结果表明:乙基钾黄药在蒙脱石上的吸附作用很小,它通过与Pb2+反应形成悬浮态物质而严重影响Pb2+在蒙脱石上的吸附作用,使Pb2+的吸附速率常数由10.40 g/(mg·min)提高到54.76 g/(mg·min),而平衡吸附量(qe)则由9.80 mg/g降低到4.27 mg/g;影响程度随着乙基钾黄药浓度的升高而增大,随着Pb2+浓度、pH和蒙脱石投加量的升高而减弱。研究结果可为黄药?重金属复合污染环境的治理提供参考。

Abstract: Adsorption equilibrium and kinetics of potassium ethyl xanthate-lead combined pollutants to montmorillonite by static adsorption experiments were investigated to reveal environmental behavior of xanthate and heavy metals in a combined pollution system. The results show that adsorption of potassium ethyl xanthate on montmorillonite is slight. Adsorption of Pb2+ to montmorillonite is seriously affected in the presence of potassium ethyl xanthate owing to a suspended product of the reaction between Pb2+ and potassium ethyl xanthate, adsorption rate constant increases from 10.40 g/(mg·min) to 54.76 g/(mg·min), while equilibrium adsorption capacity (qe) decreases from 9.80 mg/g to 4.27 mg/g. The impact degree improves with the increase of potassium ethyl xanthate concentration, but reduces with the increase of Pb2+ concentration, pH, and montmorillonite dosage. The findings may serve as an important reference for the control of xanthate and heavy metals combined pollution.

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