期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 9, 期 6, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106560
关键词
membrane distillation; removal efficiency; antibiotics wastewater; tetracycline; fluoroquinolones
资金
- Council of Scientific and Industrial Research, India [MLP-0065]
The study presents CNT functionalized ZIF8 impregnated membranes for removing antibiotics from pharmaceutical wastewater, showing enhanced flux and removal efficiency. Among the membranes, M-ZC membrane demonstrated the highest removal efficiency (>99.4%) for all antibiotics at 60 degrees C feed temperature. The mixed matrix membranes displayed exceptional thermal stability up to 400 degrees C, indicating great potential for treating antibiotic-contaminated wastewater.
We report CNT functionalized ZIF8 (CNT@ZIF8) impregnated poly(vinylidene fluoride-co-hexafluompropylene) (PVDF-co-HFP) mixed matrix membranes to remove antibiotics from pharmaceutical industry wastewater by vacuum membrane distillation. Different morphological and spectral techniques were used for structural elucidation of ZIF8 and CNT@ZIF8 and membrane performance in terms of flux and removal efficiency. Embedded ZIF8 nanoparticles in CNT retained their crystal structure in the CNT@ZIF8 composite. In the membrane matrix, impregnation of both ZIF8 and CNT@ZIF8 increased the membrane mean pore size and porosity, responsible for improved flux. In addition, rougher surface for mixed matrix membranes enhanced the hydrophobicity of membranes, and thus removal efficiency of select antibiotics used in this study. Among the fabricated membranes, the M-ZC (18% PVDF-co-HFP/0.5% CNT@ZIF8) membrane was most suitable with >99.4% removal efficiency for all the antibiotics at 60 degrees C feed temperature. The recorded flux for M-ZC was 11.1, 10.9, 12.2, and 11.6 kg m(-2) h(-1) for tetracycline, doxycycline, norfloxacin, and ciprofloxacin, respectively. The fabricated mixed matrix membranes revealed exceptional thermal stability up to 400 degrees C. The study showed that the fabricated membranes have great potential to treat wastewater containing antibiotics.
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