Lei Wang,Minjie Chen,Anhong Cai,Hanxuan Zeng,Xiaoyan Ma,Qingsong Li,Xueyan Li,Jing Deng
Chlorine activation-inefficiency and the generation of disinfection by-products (DBPs) have indeed limited the application of the UV/chlorine process. In this study, zinc ferrite nanorods (ZFO-R) with excellent photovoltaic properties were successfully prepared for the construction of a novel heterogeneous UV-LED-driven chlorine activation system. The addition of ZFO-R increased the first-order reaction rate constant for the degradation of carbamazepine (CBZ) by the UV-LED/chlorine process by 6 times. Mechanism investigation indicated that superoxide radicals (O 2 − ) dominated the generation of hydroxyl radicals (HO ) and chlorine radicals (Cl ) in the system by promoting the activation of HClO/ClO − , and the increased yields of HO and Cl enhanced their contribution to the degradation of the target pollutants. Importantly, the efficient activation of chlorine not only promoted the generation of reactive species but also inhibited the formation of DBPs by shorting the contact time between chlorine and precursors, which effectively controlled the toxicity of the reaction system. This work proposes a reliable strategy for inhibiting DBPs formation in the UV/chlorine process and broadens the application of spinel ferrites in environmental remediation, achieving efficient and reliable purification of actual micropolluted water bodies.
Regulating the nanofiltration (NF) membrane structure for the simultaneous improvement in permeance and selectivity has attracted extensive attention. In this study, ultraviolet (UV) irradiation was integrated in situ into a typical interfacial polymerization (IP) process to modulate the IP reaction precisely and thus modify the microscopic architecture of NF membranes. UV irradiation was capable of activating trimesoyl chloride (TMC) and inducing photothermal effects. The optimized NF membranes presented thinner and rougher surfaces, as well as an increased negative charge and hydrophilicity. Compared with the control NF membrane (NFM-Con), the optimized NFM-UV40 achieved excellent performance, with 35.5 % greater water permeance and 186.6 % greater Cl − /SO 4 2− separation selectivity. Notably, the UV-assisted NF membranes had better anti-fouling properties than those of commercial NF270. This study proposes a novel strategy for the precise in situ regulation of NF membrane structure and performance, enabling the development of high-performance separation membranes for NF-based water desalination.
危险品化学品经营许可证（带存储）