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十六烷基三甲基溴化铵对膨润土负载纳米铁去除水中铬(Ⅵ)的增强作用

DOI: 10.7521/j.issn.0454-5648.2014.04.15

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Abstract:

用十六烷基三甲基溴化铵(CTMAB)将膨润土负载纳米铁(B-nZVI)进行表面改性,制得材料(B-nZVI)/CTMAB。实验结果表明改性后的B-nZVI颗粒较改性前分散,膨润土表面的纳米铁颗粒能链接在一起,并且随着CTMAB剂量的适度提高,纳米铁颗粒链接现象更为明显,这是纳米铁颗粒吸附在长链高分子CTMAB的吸附点位上而导致。膨润土、B-nZVI以及CTMAB浓度为10g/L的(B-nZVI)/CTMAB的Zeta电位分别为--2.52、0.54和1.93mV,说明膨润土负载纳米铁改性后带有更强的正电荷,同时,CTMAB也使得材料比表面积更大,二者的综合作用导致(B-nZVI)/CTMAB对Cr(Ⅵ)的去除率比(B-nZVI最高能提升33.7%。(B-nZVI)/CTMAB去除Cr(Ⅵ)符合Langmuir-Hinshelwood模型,包含吸附和还原2个过程。不同产物的微观形貌的对比说明适量的CTMAB还可促进纳米铁发挥还原作用。

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