The smart eco-friendly biomass energy driven electrical degradation system was established by coupling of glucose fuel cells (GFC) and solar photo-electro-Fenton (SPEF) processes, which was proposed for the green, economical and efficient degradation of perfluorooctanic acid (PFOA). The CoFe alloy nanoparticles with oxygen defects (O*) based on metal–organic frameworks (MOFs) were decorated on polyacrylonitrile (PAN)-driven carbon nanofiber (CNF) membrane to obtain the bifunctional photocathode (CoFe-OVs@CNF) with both extraordinary photo-catalytic and electro-catalytic abilities. PFOA was highly mineralized on CoFe-OVs@CNF through the synergy of photocatalytic oxidation and electro-Fenton processes. Moreover, the energy consumption for degradation was generated from direct electro-oxidation of glucose as the clean power on anode (GFC). The possible mechanism and degradation pathway for PFOA mineralization was investigated in detail according to intermediate analysis, active species verification and the valence state change of Co and Fe on cathode. Besides, the toxicity evolution during PFOA degradation was also evaluated to deeper insight into risk assessment of intermedia products and relative toxicity, intending to prove the potential for practical elimination of PFOA and other toxicity recalcitrant pollutants in wastewater by GFC-SPEF system.
Yangkai Xiong,Zhiqiang Fang,Panpan Tang,Yu Li,Hao Jiang,Jipeng Li,Zheng Li,Guoqing Wang
Biological fouling is a considerable threat to the marine industry because attached microcontaminants and microorganisms inflict serious damage on marine installations and aquacultures. Although there has been tremendous effort in researching marine antifouling, it is yet challenging to develop a long-term and consistent antifouling strategy and materials. Here, polyhexamethylene-biguanide (PHMB) and MXene are introduced into the carboxylated cellulose nanofibers (CNF) reinforced polyvinyl alcohol (PVA) hydrogel to obtain a self-healing and ultra-high toughness antifouling hydrogel. The as-prepared double network (DN) hydrogels have extremely high toughness (16,050 kJ/m 3 ), superior anti-protein adhesion (100 %) and anti-algal adhesion (100 %), exceptional antibacterial activity (99.97 %), and remarkable photothermal self-healing capability. Furthermore, the DN hydrogel provide outstanding antifouling performance for at least six months in the actual marine field. This work provides an effective and feasible strategy to prevent marine biofouling and also initiates new approaches to the application of hydrogel.
危险品化学品经营许可证（带存储）