Wang Yonglei, Wang Xuelin, Zhou Anran, Li Jingjing, Tian Liping, Zhang Mengyu, Sun Wentao, Ding Luming
School of Municipal and Environmental Engineering, Shandong Jianzhu University, 250101, Jinan, PR China.
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Chongqing University, Chongqing, 400045, PR China.
Chemosphere. 2021 Jun;272:129867. doi: 10.1016/j.chemosphere.2021.129867. Epub 2021 Feb 9.
In this paper, the membrane filtration-photocatalytic coupling process was used to explore the mechanism and removal effect of trace concentrations of sulfadiazine (SD) in drinking water. First, 8 kinds of ultrafiltration membranes were successfully prepared, and their performance was verified by scanning electron microscopy and measurement of the contact angle, membrane pure water flux, porosity and average pore size. The results showed that the best-performing membranes were the PVDF-PP-TiO-DA (dopamine) (PPTD)- and PVDF-PP-TiO-FeCl (PPTFe)-modified ultrafiltration membranes, in which TiO was modified with DA and FeCl, forming the cooperation of TiO/DA and TiO/Fe, with removal rates of 91.4% and 92.6% and quasi-first-order rates of 0.0216 min-1 and 0.0214 min-1. At the same time, the effects of the two types of membrane, UV light and water quality characteristics on the removal performance of the membrane filtration-photocatalytic system were discussed. Among them, the PPTD membrane was more suitable than the other membranes for the degradation of weakly alkaline water containing SD (pH = 7.5), except when NO was present, and the water quality characteristics had a significant inhibitory effect on the removal effect. The PPTFe membrane was more suitable for the degradation of acidic water containing SD (pH = 3). Additionally, the water quality characteristics had an obvious inhibitory effect on the removal effect, and the accuracy of the water distribution experimental results was verified by using an actual body of water. In the end, the reaction mechanism of the filtration-photocatalytic system was proposed, and it was found that OH played an indispensable role in the removal of SD.
本文采用膜过滤 - 光催化耦合工艺，探究饮用水中痕量磺胺嘧啶（SD）的去除机制及效果。首先，成功制备了8种超滤膜，并通过扫描电子显微镜、接触角测量、膜纯水通量、孔隙率和平均孔径测定对其性能进行了验证。结果表明，性能最佳的膜是PVDF - PP - TiO - DA（多巴胺）（PPTD）和PVDF - PP - TiO - FeCl（PPTFe）改性超滤膜，其中TiO分别用DA和FeCl进行改性，形成TiO/DA和TiO/Fe的协同作用，去除率分别为91.4%和92.6%，准一级反应速率分别为0.0216 min⁻¹和0.0214 min⁻¹。同时，探讨了两种膜、紫外光和水质特性对膜过滤 - 光催化系统去除性能的影响。其中，除存在NO时外，PPTD膜比其他膜更适合降解含SD的弱碱性水（pH = 7.5），且水质特性对去除效果有显著抑制作用。PPTFe膜更适合降解含SD的酸性水（pH = 3）。此外，水质特性对去除效果有明显抑制作用，并通过实际水体验证了配水实验结果的准确性。最后，提出了过滤 - 光催化系统的反应机理，发现·OH在SD的去除中起不可或缺的作用。
