Ziai Huang,Kexin Li,Liushui Yan,Huiqin Guo,Shenglian Luo
In this paper, bio-based acidic nonmetals co-doped titanium dioxide (C-SO 3 H/CN-TiO 2 ) with core/shell microstructure is successfully fabricated by a simple method. The synergistic effect of surface hydrogen ions (H + ) provided by sulfonic acid groups ( SO 3 H) functionalized bio-based carbon cores and photogenerated electrons generated by the visible-light excitation of nonmetals co-doped titanium dioxide (TiO 2 ) shells makes the as-prepared C-SO 3 H/CN-TiO 2 can rapidly reduce aqueous hexavalent chromium [Cr(VI)] under original pH condition. The addition of inorganic or organic acid is avoided during the photocatalytic reduction of aqueous Cr(VI). Therefore, the secondary pollution is effectively prevented during Cr(VI) reduction. The SO 3 H can be easily loaded on the surface of bio-based carbon cores by the thermal effect of light irradiation in concentrated H 2 SO 4 due to the aromatic carbon framework of bio-based carbon cores. The successful introduction of C and N elements into TiO 2 shells allows the as-prepared C-SO 3 H/CN-TiO 2 to exhibit a visible-light photocatalytic activity. Aqueous Cr(VI) having a concentration of 10 mg/L can be completely reduced after 180 min of visible-light irradiation under original pH condition.
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.
Separating oil-water emulsions in harsh conditions poses a substantial challenge for filtration membrane systems. In response, this study presented a continuous electrospinning technique to fabricate a robust bifacial composite membrane. Two types of high-performance polyarylene ether nitrile (PEN) polymers, PEN-BPA and PEN-B/P, with different wettability, are employed to construct the AB bifacial structure. Further, the A-side is modified with hydrophilic polydopamine (PDA) and antibacterial silver nanoparticles (Ag NPs) to prepare Ag@PDA/PEN-BPA, while the B-side is altered with photocatalytic titanium dioxide nanoparticles (TiO 2 ) to prepare TiO 2 /PEN-B/P. The resulting Ag@PDA/PEN-TiO 2 /PEN-B/P bifacial membrane demonstrates remarkable photocatalytic degradation efficiency, particularly for MB, reaching 99.8% degradation efficiency. Moreover, the permeation flux and oil-water emulsion separation rejection rate of the membrane reach 5180.34 L m − 2 ·h −1 and 99%. The PEN substrates are not only used to construct the AB bifacial structure but also to enhance the membrane's toughness and durability, ensuring stability in high-temperature and corrosive environments, with a rejection rate reaching 99% after 10 reuse cycles. Furthermore, integrating Ag NPs imparts excellent antibacterial properties to the membrane, sustaining a 99.99% antibacterial rate after oil-water emulsion separation, photocatalytic dye degradation, and exposure to high-temperature NaCl immersion. This study offers novel insights into multifunctional water treatment materials in harsh environments.
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