膨润土-壳聚糖复合吸附剂处理水中Cr(Ⅵ)的研究

将壳聚糖与膨润土结合,制备出复合吸附剂,研究了其对Cr(VI)的吸附,详细探讨了复合吸附剂吸附Cr(VI)的最佳工艺条件。结果表明,复合吸附剂对Cr(VI)具有较好的吸附性能,吸附的最佳工艺条件是:pH值为4～6,废水中Cr(VI)质量浓度不大于10mg/L,吸附平衡时间为40min左右,吸附剂用量为8.0g/L,壳聚糖与膨润土质量比为0.04。与单一的膨润土或壳聚糖相比,该吸附剂对Cr(VI)离子的吸附速度快、吸附能力强,并且具有成本低、应用范围广等优点。

Treatment of chromium(Ⅵ) in water by bentonite-chitosan compound adsorbent

A compound adsorbent was prepared with the combination of chitosan and bentonite,its adsorptivity toward Cr(Ⅵ) was studied,and the optimal condition for the Cr(Ⅵ) adsorption by it was discussed in details.The results show that,the said compound adsorbent has good adsorptivity toward Cr(Ⅵ),the optimal condition for the adsorption process is: the pH value is 4-6,the mass concentration of Cr(Ⅵ) in wastewater does not exceed 10 mg/L,the adsorption equilibrium time is about 40 min,the dosage of the adsorbent is 8.0 g/L,the mass ratio of chitosan and bentonite is 0.04.Compared with the single bentonite or chitosan,the said adsorbent not only has a faster adsorption speed and a better adsorbability,but also has the advantages of low costs,broad application scope,etc.