伊利石/海藻酸钠复合材料吸附水中Cr(VI)

Adsorption of Cr(VI)in water by illite/sodium alginate composite

以海藻酸钠(SA)为原料,添加伊利石(IL)制备了伊利石/海藻酸钠(IL/SA)凝胶球复合材料.研究了凝胶球对水中Cr(VI)的吸附能力,探讨了溶液pH、Cr(VI)初始质量浓度对Cr(VI)吸附性能的影响.结果表明,IL/SA凝胶球对Cr(VI)的最佳吸附条件是溶液pH为2,Cr(VI)初始质量浓度为300mg/L,吸附时间为4h.在热力学方面,吸附数据结果表明更符合Langmuir吸附等温模型,Cr(VI)在凝胶球上的吸附是单分子层的;在动力学方面,吸附数据结果更符合准二级动力学模型.

Illite/sodium alginate(IL/SA)gel ball composite was prepared from sodium alginate(SA)and illite(IL).Adsorption capacity of Cr(VI)in water by gel ball adsorbent was studied.The effects of pH value and initial mass concentration of Cr(VI)on the adsorption of Cr(VI)were discussed.The results showed that the optimal adsorption conditions of IL/SA gel ball for Cr(VI)were as follows,pH 2 of solution,300 mg/L of Cr(VI)initial mass concentration and 4 h of adsorption time.In terms of thermodynamics,the results of adsorption data are more consistent with Langmuir model,indicating that the adsorption of Cr(VI)on gel ball is monolayer.In terms of kinetics,the results of adsorption data are more consistent with the quasi-second-order kinetic model.