硝酸改性活性炭的制备及其对Cr(Ⅵ)的吸附性能

Preparation of HNO_3-Modified Activated Carbon and Its Adsorption Capability to Cr(Ⅵ)

利用硝酸对颗粒活性炭进行改性,处理含铬废水,并考察了吸附时间、溶液pH、吸附剂加入量对改性活性炭吸附Cr(Ⅵ)效果的影响。实验结果表明:经过硝酸氧化改性的活性炭比表面积有所增加,官能团总量增加明显;吸附剂对Cr(Ⅵ)的去除率随振荡时间的增加而增加;对于质量浓度为10 mg/L的100 mL Cr(Ⅵ)溶液,当溶液pH为中性,30%(体积分数)硝酸改性的颗粒活性炭的加入量为0.4 g,其对Cr(Ⅵ)的最大去除率为98%。

Granular activated carbon was modified with HNO3 and used to treat chromium-containing wastewater.The effects of adsorption time,solution pH,adsorbent dosage on the Cr（Ⅵ） adsorption capability of the modified activated carbon were studied.The experimental results show that：The specific surface area and the total quantity of functional groups of the modified activated carbon is increased significantly;The Cr（Ⅵ） removal rate is increased with the prolonging of shaking time;When the Cr（Ⅵ） mass concentration is 10 mg/L,the solution volume is 100mL,the solution pH is neutral,and the dosage of the granular activated carbon modified with 30%（volume fraction） HNO3 is 0.4 g,the maximum Cr（Ⅵ） removal rate is 98%.