磁性碳纳米管对水中Cr(VI)污染物的去除研究

摘要

This paper studied the removal of Cr(VI)pollutant by magnetic carbon nanotubes in water. The effect of adsorbent amount,adsorption time,solution temperature,Cr(VI)concentration and pH on Cr (VI)adsorption were investigated. The results showed that: Conducting research on the amount of adsorbent,Cr(VI)adsorption increased with increasing amount of adsorbent. The adsorbent was 2 g/L,the maximum adsorption was 72.65%. Before 15 min, Cr(VI)adsorption increases with the increase of time, basically unchanged after 15 min. The adsorption increases as the temperature rises. When Cr(VI) concentration between 0~1 mg/L,with the increase of Cr(VI)concentration,adsorption also increased,but after 1 mg/L, when Cr(VI)concentration further increased, the absorption is reduced. In the acidic environment of pH 4~7, Cr(VI)adsorption increases with the decrease of pH, whereas at pH 7~9 in an alkaline environment,pH effect on the adsorption is not great. Above all, in the adsorbent usage of 2 g/L, the adsorption time for 15 min,solution temperature was 60℃,the raw concentration of 1 mg/L,under the condition of pH 4.0,the adsorption of Cr(VI)can reach the best performance.%主要研究了碳纳米管-铁氧化物磁性复合材料在处理Cr(VI)污染物方面的应用.分别考察了吸附剂用量、吸附时间、溶液温度、Cr(VI)浓度和pH对Cr(VI)吸附率的影响.结果表明:在进行关于吸附剂用量的研究时,磁性复合材料对Cr(VI)的吸附率随着吸附剂用量的增加而增大,在吸附剂投入为2 g/L时,吸附率达到最大72.65%.在15 min之前,磁性复合材料对Cr(VI)的吸附率随时间的增加而增大,在15 min后基本保持不变.此外,吸附率随着温度的上升逐渐增大.Cr(VI)浓度在0~1 mg/L 之间,随着Cr(VI)浓度的增加,吸附率也增大,而在1 mg/L之后,Cr(VI)浓度再增加,吸附率反而减小.在pH为4~7的酸性环境中,磁性复合材料对Cr(VI)的吸附率随pH的减小而增大,而在pH为7~9的碱性环境中,pH对吸附率的影响并不是很大.综上所述:在吸附剂用量为2 g/L,吸附时间为15 min,温度为60 ℃,原水浓度为1 mg/L,pH为4.0的情况下,磁性复合材料对原水中Cr(VI)的吸附率达到最佳的去除效果.