凹凸棒土基磁性复合材料对水溶液中Cu(Ⅱ)和氯酚的吸附特性

Adsorption of Two-component Cu(Ⅱ) and Chlorophenol by Magnetic Attapulgite Composites

针对粉末状凹凸棒土在实际应用中难以固液分离的问题,采用铁酸钴对有机改性后的凹凸棒土(OAT)进行磁性负载,制备凹凸棒土基铁酸钴磁性复合材料(MOAT),探究它对水溶液中Cu(Ⅱ)和氯酚的双组分吸附性能。结果表明,与凹凸棒土原土相比,MOAT对氯酚的吸附量明显提高,且在外加磁场的条件下能够快速实现固液分离。单组分溶液体系中,MOAT的吸附速率很快,对Cu(Ⅱ)和氯酚的吸附分别在150 min和40 min即可达到吸附平衡。在pH值=5的双组分溶液体系中,Cu(Ⅱ)的存在对MOAT吸附氯酚的性能有很大影响,而氯酚对Cu(Ⅱ)的吸附量则影响很小,MOAT优先吸附Cu(Ⅱ)。无机盐离子的存在会促进MOAT对两种物质的吸附性能,增加吸附量。

In view of the difficulty of solid-liquid separation of attapulgite powder in practical application, cobalt ferrite is used to magnetically load the modified attapulgite, and the adsorption performance of the mixed solution containing p-chlorophenol and Cu(Ⅱ) is explored. The experimental results show that, compared with the attapulgite soil, the magnetic composites has a significantly higher adsorption capacity for organic compounds, and the loading of magnetic particles have little effect on the adsorption rate. The adsorption rate is fast, and the p-chlorophenol and Cu(Ⅱ) are easily separated. Adsorption equilibrium can be reached at 150 min and 40 min. In the coexisting solution with pH=5, the presence of Cu(Ⅱ) has a great influence on the adsorption of p-chlorophenol onto the composites, while the p-chlorophenol has little effect on the adsorption of Cu(Ⅱ). The material preferentially adsorbs Cu(Ⅱ). The presence of inorganic salt ions promote the adsorption of the two materials by the composite material and increase the adsorption capacity.