Efficient degradation of sulfamethoxazole by CoCu LDH composite membrane activating peroxymonosulfate with decreased metal ion leaching
Efficient degradation of sulfamethoxazole by CoCu LDH composite membrane activating peroxymonosulfate with decreased metal ion leaching
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DOI：
10.1016/j.cej.2020.127887
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发表时间：
2021-05-12
影响因子：
15.1
通讯作者：
Cheng, Xiuwen
中科院分区：
文献类型：
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作者：
Guo, Ruonan;Li, Yunhe;Cheng, Xiuwen
在本研究中，我们首次制备了两种以CoCu层状双氢氧化物（LDH）纳米粒子装饰的复合膜，即LDH@Calotropis巨纤维（LDH@CGF）和LDH@polyvinylidene氟化物（LDH@PVDF）。此外，比较了不同类型LDH复合功能膜在PMS活化体系中的应用潜力。两种ldh基复合膜在过氧单硫酸盐（PMS）活化过程中均表现出优异的活性。更重要的是，复合膜可以从处理后的水中分离出来，满足实际应用的需要。优选的复合膜为LDH@PVDF，具有优异的PMS活化能力，金属离子浸出浓度较低（钴0.044 mg L-1，铜0.026 mg L-1）。然后利用LDH@PVDF考察了PMS在各种药物污染物去除工艺中的活化性能。此外，还检测了LDH@PVDF在真实水生环境（自来水和废水）中对SMX的降解活性，证明了LDH@PVDF膜的广泛实用性。最后，提出了ldh基复合膜/PMS体系中SMX可能的降解途径和PMS激活机制。因此，本研究为ldh基膜的构建提供了环保催化膜的制备和在废水处理中的实际应用的新思路。
In this study, we prepared two types of composite membranes decorated with CoCu layered double hydroxide (LDH) nanoparticles, i.e. LDH@Calotropis gigantean fiber (LDH@CGF) and LDH@polyvinylidene fluoride (LDH@PVDF) for the first time. Besides, the application potential of different types of composite functional membranes based on LDH in PMS activation system was compared. Both of the LDH-based composite membranes exhibited excellent activity in peroxymonosulfate (PMS) activation process. More importantly, the composite membrane could be separated from the treated water to meet the need of practical application. The superior composite membrane was identified as LDH@PVDF, which was with excellent PMS activation capability and pretty lower metal ions leaching concentration (cobalt 0.044 mg L-1, copper 0.026 mg L-1). And then, LDH@PVDF was employed to investigate the PMS activation performance in various pharmaceutical pollutants removal processes. Besides, the activity of LDH@PVDF for SMX degradation in real aquatic environment (tap water and wastewater) was detected, proving the wide practical applicability of LDH@PVDF membrane. Finally, the possible SMX degradation pathway and PMS activation mechanism occurring in LDH-based composite membrane/PMS system were proposed. Hence, this study for LDH-based membranes construction may provide new insights into the environmentally-friendly catalytic membranes preparation and practical application in wastewater treatment.