Fang Hongbo, Wang Mingxia, Yi Hong, Zhang Yanyan, Li Xiaodan, Yan Feng, Zhang Lu
Sinopec Petroleum Engineering Co., Ltd., Dongying 257026, P. R. China.
School of Materials Science and Engineering, Tiangong University, Tianjin 300387, P. R. China.
ACS Omega. 2020 Apr 10;5(15):8707-8720. doi: 10.1021/acsomega.0c00135. eCollection 2020 Apr 21.
Porphyrin-based catalytic oxidation is one of the most representative biomimetic catalysis. To mimic the biomimetic catalytic oxidation of nature, a positive charged porous membrane, quaternized polysulfone (QPSf) membrane with spongelike structure, was prepared for supporting -tetraphenylsulfonato porphyrin (TPPS). The influence of polymer concentration, coagulation bath, and additives on the structure of the substrate membrane was explored, and the optimized membrane with porosity of 87.1% and water flux of 371 L·m·h at 0.1 MPa was obtained. Monolayer TPPS was adsorbed on the QPSf membrane surface by the electrostatic self-assembly approach, and the adsorption process followed the pseudo second-order kinetic model and Langmuir adsorption isotherm equation. The resulting TPPS@QPSf membrane showed excellent visible light response, and the photocatalytic performance for dyes was then enhanced dramatically after TPPS was immobilized on the membrane. The removal efficiencies for rhodamine B (RhB), methylene blue (MB), and methyl orange (MO) were 92.1, 94.1, and 92.1% under visible light irradiation, respectively. The primary photocatalytic degradation of the dye was a zero-order reaction, and the secondary reaction of degradation followed pseudo first-order kinetics. Finally, the TPPS@QPSf membrane can be reused for photocatalytic degradation of RhB for 10 cycles with no obvious change on removal efficiency, which indicated that this membrane is a promising material for dyeing water treatment coupled with visible light irradiation.
基于卟啉的催化氧化是最具代表性的仿生催化之一。为了模拟自然界的仿生催化氧化，制备了一种带正电荷的多孔膜——具有海绵状结构的季铵化聚砜（QPSf）膜，用于负载四苯基磺酸卟啉（TPPS）。探究了聚合物浓度、凝固浴和添加剂对基底膜结构的影响，获得了孔隙率为87.1%、在0.1MPa下通量为371L·m⁻²·h⁻¹的优化膜。通过静电自组装方法将单层TPPS吸附在QPSf膜表面，吸附过程遵循准二级动力学模型和朗缪尔吸附等温线方程。所得的TPPS@QPSf膜表现出优异的可见光响应，在将TPPS固定在膜上后，其对染料的光催化性能显著增强。在可见光照射下，对罗丹明B（RhB）、亚甲基蓝（MB）和甲基橙（MO）的去除率分别为92.1%、94.1%和92.1%。染料的初级光催化降解为零级反应，降解的二级反应遵循准一级动力学。最后，TPPS@QPSf膜可重复用于RhB的光催化降解10个循环，去除效率无明显变化，这表明该膜是一种在可见光照射下用于印染废水处理的有前景的材料。
