氧化淀粉对水溶液中Cd~(2+)的吸附研究

目的]探讨氧化淀粉对水溶液中Cd2+的吸附效果。方法]采用30%过氧化氢氧化可溶性淀粉制得氧化淀粉,研究氧化淀粉对水中Cd2+的吸附行为以及影响吸附效果的重要因素,并测定了氧化淀粉对Cd2+的吸附等温线。结果]氧化淀粉对水中Cd2+的吸附效果受吸附温度、pH、吸收剂用量和吸附时间的影响,其中pH影响最大;最佳吸附条件为pH 5、吸附温度30℃、吸附时间4 h和吸收剂用量3 g,Cd2+去除率达到82.15%。在该试验条件下,氧化淀粉对Cd2+的吸附模式符合Longmuir等温方程。结论]采用30%过氧化氢制备得到的氧化淀粉对水中的Cd2+具有很好的吸附效果。

Adsorption of Cd2+ in Water by Oxidized Starch

Objective] The aim was to explore the adsorption effect of Cd2+ in water by oxidized starch.Method] Oxidized starch was prepared by using soluble starch as material and 30% hydrogen peroxide as oxidant.Adsorption effect of Cd2+ in water by oxidized starch and the factors affecting adsorption properties were investigated,and the adsorption isotherm was studied.Result] The adsorption of Cd2+ in water by oxidized starch was affected by adsorption temperature,pH,the amount of adsorption reagents and adsorption time,among them pH was most important.The optimal adsorption conditions were pH 5,adsorption temperature 30 ℃,adsorption time 4 h and the amount of adsorption reagents 3 g,and the removal rate of Cd2+ in water reached 82.15%.The adsorption behavior of oxidized starch to Cd2+ fit well into the Langmuir model under the experimental condition.Conclusion] The oxidized starch prepared by using soluble starch as material and 30% hydrogen peroxide as oxidant shows good adsorption effect to Cd2+ in water.