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本研究针对印染废水处理及有毒重金属Cr(Ⅵ)处理困难的问题,通过制备纤维素氨基甲酸酯(Cellulose carbamate,CC)/二硫化钼(MoS2)复合分离膜,借助二者对Cr(Ⅵ)的吸附作用以及MoS2的光催化还原作用,从而实现了染料分离过程中的Cr(Ⅵ)的同步脱毒。实验利用拉曼光谱、扫描电镜以及EDX表征证明了MoS2在CC膜中的成功负载;通过表面接触角测量仪、吸附实验以及光催化过滤实验等手段评价了MoS2的负载对膜性能的影响。实验结果表明,MoS2的添加一方面改善了膜的亲水性,提高了膜的通量;另一方面也提升了膜整体对Cr(Ⅵ)的吸附能力。在施加可见光光照过滤含铬染料废水的过程中,CC/MoS2分离膜对染料的优异截留性能避免了其与Cr(Ⅵ)在膜内的竞争吸附现象,使Cr(Ⅵ)在膜内得到更好的吸附和光催化还原效果,最终实现染料高效截留的同时,通过光催化还原一定程度上消除了染料废水中Cr(Ⅵ)的毒性。
Abstract：This study focuses on the treatment of dyeing wastewater and the existed toxic heavy metal Cr(Ⅵ). By using the prepared cellulose carbamate(CC)/molybdenum disulfide(MoS2) composite membranes, the Cr(Ⅵ) was simultaneously reduced during the dye separation process due to the adsorption and photocatalytic ability of MoS2. The Raman spectroscopy, scanning electron microscopy(SEM) and energy-dispersive X-ray spectroscopy(EDX) characterizations were employed to explore the loadings of MoS2 in the CC membranes with different prescriptions. The effect of the MoS2 loadings on the performance of the composite membranes was evaluated by the water contact angle measurement, adsorption experiment and photocatalytic filtration experiment. The results indicated that the addition of MoS2 improved the hydrophilicity and flux of the membranes; and the adsorption capacity of the composite membrane for Cr(Ⅵ) was also enhanced with the MoS2 loading. In membrane filtration process of chromium-containing dyeing wastewater with visible light irradiation, the great sieving ability of the CC/MoS2 membrane for dye released its competitive adsorption with Cr(Ⅵ) in membrane substance, which further enhanced the inner adsorption and photocatalytic reduction of Cr(Ⅵ) in membrane. As a consequence, the prepared exhibited a enhance performance for both dye retention and Cr(Ⅵ) reduction.
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基本信息:
DOI：10.16026/j.cnki.iea.2021030207
中图分类号:X703;TQ051.893;TQ426
引用信息:
[1]裴宇翔,张阳,张淏泉,等.纤维素氨基甲酸酯/MoS_2分离膜的制备及光催化还原Cr(Ⅵ)研究[J].离子交换与吸附,2021,37(03):207-219.DOI:10.16026/j.cnki.iea.2021030207.
基金信息:
国家自然科学基金青年科学基金项目(51808388); 天津市自然科学基金项目(No.18JCQNJC76700); 中国科协第五届青年人才托举工程(2019QNRC001)
2021-06-20
2021-06-20