Cui Yanhua, Yang Lili, Zheng Jian, Wang Zengkai, Li Binrong, Yan Yan, Meng Minjia
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China.
Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
J Colloid Interface Sci. 2021 Mar 15;586:335-348. doi: 10.1016/j.jcis.2020.10.097. Epub 2020 Oct 27.
Designing photocatalytic membranes with excellent photocatalytic and self-cleaning ability based on the synergistic effect between the crystal structure of membrane matrix and photocatalyst is highly desirable. Herein, Z-scheme 2D/3D g-CN/BiOI heterojunction blended in beta-phase polyvinylidene fluoride membrane (β-phase PVDF) was prepared via solvent crystallization and phase inversion technique. As expected, the designed g-CN/BiOI/β-phase PVDF photocatalytic membranes (CN/BI/β-phase PVDF PMs) achieved exceptional photocatalytic degradation efficiency for tetracycline (94.6%) as compared to the CN/BI heterojunction power (84.0%) and two other control membrane matrixes (CN/BI/PAN and CN/BI/CA PMs) within 120 min. Meanwhile, the dynamic cyclic degradation system of CN/BI/β-phase PVDF PMs was also investigated that reached to be 94.8% in 80 min. Besides, the CN/BI/β-phase PVDF PMs not only had outstanding self-cleaning activity and remarkable permeability (up to 30,688 L·m·h) but also had high stability and reusability even after five runs. Importantly, the hydroxyl radical detection and ESR analysis identified that the β-phase PVDF membrane could promote photoinduced carrier separation efficiency of 2D/3D g-CN/BiOI heterojunction. This work may open up a novel strategy for designing and constructing high-efficient photocatalytic membranes for water treatment.
基于膜基质晶体结构与光催化剂之间的协同效应设计具有优异光催化和自清洁能力的光催化膜是非常有必要的。在此，通过溶剂结晶和相转化技术制备了Z型二维/三维石墨相氮化碳/碘化铋异质结掺杂在β相聚偏氟乙烯膜（β相PVDF）中。正如预期的那样，与石墨相氮化碳/碘化铋异质结粉末（84.0%）以及其他两种对照膜基质（石墨相氮化碳/碘化铋/聚丙烯腈和石墨相氮化碳/碘化铋/醋酸纤维素膜）相比，所设计的石墨相氮化碳/碘化铋/β相PVDF光催化膜（CN/BI/β相PVDF PMs）在120分钟内对四环素的光催化降解效率达到了94.6%。同时，还研究了CN/BI/β相PVDF PMs的动态循环降解系统，其在80分钟内达到了94.8%。此外，CN/BI/β相PVDF PMs不仅具有出色的自清洁活性和显著的渗透性（高达30,688 L·m·h），而且即使经过五次运行后仍具有高稳定性和可重复使用性。重要的是，羟基自由基检测和电子顺磁共振分析表明，β相PVDF膜可以提高二维/三维石墨相氮化碳/碘化铋异质结的光生载流子分离效率。这项工作可能为设计和构建用于水处理的高效光催化膜开辟一种新策略。
