磁性碳纳米管对水中Cr(VI)污染物的去除研究

Removal of Cr(VI) Pollutant by Magnetic Carbon Nanotubes in Water

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p H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p H为4~7的酸性环境中,磁性复合材料对Cr(VI)的吸附率随p H的减小而增大,而在p H为7~9的碱性环境中,p H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,p H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。

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 p H 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 p H 4~7, Cr(VI) adsorption increases with the decrease of p H, whereas at p H 7~9 in an alkaline environment, p H 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 p H 4.0, the adsorption of Cr(VI) can reach the best performance.