National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, 12120, Thailand.
Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok, 10900, Thailand.
Chemosphere. 2022 Nov;307(Pt 2):135760. doi: 10.1016/j.chemosphere.2022.135760. Epub 2022 Aug 2.
This experimental research proposes an environment-friendly and low-cost porous geopolymer composite membrane (PGCM) to treat antibiotics in hospital wastewater. The proposed PGCM consisted of two layers: a porous support layer and a dense coating layer. The dense coating layer was synthesized by incorporating variable TiO content (0, 2, 6, and 10 wt%) into the geopolymer matrix. The dense coating layer was of hierarchical mesoporous structure with 700 μm in thickness and adhered to the porous support layer. The average pore size, total pore volume, and open porosity of the dense coating layer decreased with an increase in TiO, resulting in reduced water permeability. The PGCM was applied to remove six target antibiotics including amoxicillin, ciprofloxacin, norfloxacin, sulfamethoxazole, tetracycline, and trimethoprim in real hospital wastewater. By comparison, the PGCM with 10 wt% TiO achieved the highest antibiotic removal efficiencies, with the adsorption and combined adsorption/photodegradation removal efficiencies for the target antibiotics of 38-75% and 74-86%, respectively. The novelty of this research lies in the use of a tailor-made porous geopolymer composite membrane incorporated with TiO photooxidation as a single-step treatment of recalcitrant antibiotics contained in hospital wastewater.
本实验研究提出了一种环保且低成本的多孔地质聚合物复合膜（PGCM），用于处理医院废水中的抗生素。所提出的 PGCM 由两层组成：多孔支撑层和致密涂层层。致密涂层层是通过将可变的 TiO 含量（0、2、6 和 10wt%）掺入地质聚合物基质中合成的。致密涂层层具有 700μm 的厚度和分层介孔结构，附着在多孔支撑层上。致密涂层层的平均孔径、总孔体积和开口孔隙率随着 TiO 的增加而减小，导致水渗透性降低。PGCM 应用于去除实际医院废水中的六种目标抗生素，包括阿莫西林、环丙沙星、诺氟沙星、磺胺甲恶唑、四环素和甲氧苄啶。相比之下，添加 10wt%TiO 的 PGCM 实现了最高的抗生素去除效率，对目标抗生素的吸附和结合吸附/光降解去除效率分别为 38-75%和 74-86%。本研究的新颖之处在于使用定制的多孔地质聚合物复合膜结合 TiO 光氧化作为单一处理步骤，用于处理医院废水中含有的难处理抗生素。
