As a novel photocatalyst with visible light responsiveness, Bi 2 WO 6 has excellent activity in treating wastewater containing organic pollutants and noble metals. However, its photocatalytic action is limited due to the rapid recombination of photogenerated electrons and holes. Based on the study of Bi 2 WO 6 , a type Ⅱ heterojunction photocatalyst (WO 3 /Bi 2 WO 6 ) and a Z-scheme heterojunction photocatalyst (CdS/Bi 2 WO 6 ) were constructed. Composites exhibited higher catalytic activity than pure Bi 2 WO 6 . The degradation efficiency of RhB(50 mg/L) and reduction efficiency of Cr(VI) (50 mg/L) by 5%WO 3 /Bi 2 WO 6 catalyst within 60 min of photocatalytic reaction was 98.82% and 53.82%, respectively. The degradation efficiency of RhB and reduction efficiency of Cr(VI) by 15%CdS/Bi 2 WO 6 catalyst was 99.52% and 69.52%, respectively. By studying the structural composition , microscopic morphology, photoelectrochemical performance, and light absorption performance of the catalysts of the two different systems. These mechanisms may help to explain the reasons for the enhanced activity of the composite photocatalysts. In addition, mixed wastewater containing organic pollutants (RhB) and heavy metal ions (Cr(VI)) was used to simulate real and complex wastewater, which provided more ideas for wastewater treatment problems.
Antibiotics (or pharmaceuticals) and inorganic nitrogen may coexist in mariculture wastewater, adversely affecting food safety and coastal ecology. Advanced treatment of marine wastewater is of great significance. In this study, simultaneous removal of refractory berberine chloride (BC) and ammonium nitrogen (NH 4 + -N) was firstly achieved in a visible-light-driven marine photocatalytic fuel cell/peroxymonosulfate (PFC/PMS) system. The modified blue TiO 2 nanotube arrays (TNA) anode and Cu-Co-WO 3 cathode bridged photo-electrocatalysis, sulfate radical-based oxidation and catalytic chlorination, benefiting both pollutant removal and fuel cell electricity generation. Under optimized conditions (double photoelectrodes, 2.5 mM PMS, R = 500 Ω), the system had an open circuit voltage of 0.57 V, removing 95% of BC and NH 4 + -N, meeting the discharge standard of mariculture. Natural-sourced COD Mn , and inorganic nitrogen in simulated mariculture wastewater were also efficiently removed with power generation. The mechanism involving (photo-)electrocatalytic chlorination and PMS-chlorination theoretically supports the application/optimization of integrated electrochemical technologies for marine pollution control.
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