改性玉米秸秆对废水中Cr^(6+)吸附的研究

Adsorption of Cr^(6+) wastewater with modified corn straw

对玉米秸秆进行化学改性,应用改性玉米秸秆对含六价铬(Cr^(6+))废水进行吸附研究。研究了改性玉米秸秆吸附剂用量、pH值、温度对废水中Cr^(6+)吸附作用的影响。结果表明:对≤100mg/L(质量浓度)的Cr^(6+)废水,在秸秆用量为0.03g(质量浓度0.6g/L)、pH值为2、吸附温度20℃、吸附平衡时间120min条件下,对Cr^(6+)的去除率为99.9%,吸附量为166.5mg/g。吸附是自发吸热过程。

The corn straws were modified by chemical means. Then the adsorption of chromium-contaminated wastewater by the modified corn straws was studied. Effects of sorhent dosage,initial pH and temperature on remove rate of Cr6＋ were studied. The results showed that the remove rate and the adsorption capacity were 99.9 % and 166.5mg/g, re- spectively,under the condition of sorbent dosage 0.6g/L, initial pH 2, the temperature 20℃ and the absorbing time 120min. The adsorption was a spontaneous endothermic reaction.