Development of multi-functional photocatalysts for CO2 reduction and pollutant elimination is practically significant for solving the environmental problems and energy shortages. In this study, we have immobilized FeWO4 (FWO) nanoparticles on the surface of (001)-facet-exposed BiOCl (BOC) nanosheets through their strong electrostatic interaction to form FWO/BOC heterojunctions. Experimental and theoretical studies corroborate that the FWO/BOC heterojunctions exhibit high-efficiency Z-scheme transfer and separation of photocarriers, and possess excellent photocatalysis for CO2 reduction and bisphenol A (BPA) degradation. Under simulated-sunlight irradiation, the 9 %FWO/BOC heterojunction exhibits a photoreduction performance with CH4/CO yield rates of 4.25/9.41 μmol g−1 h−1 (5 h reaction), which are 3.86/5.26 times higher than those for bare BOC; whereas its photodegradation performance (η(60 min) = 66.8 %, kapp = 0.01755 min−1) is enhanced by 4.3 and 2.7 times compared with that of bare FWO and BOC, respectively. Furthermore, when ultrasonic vibration is simultaneously employed during the simulated-sunlight illumination, the ultrasonic-induced piezoelectric polarization field in BOC nanosheets accelerates the bulk photocarrier separation, resulting in a further improvement in the BPA degradation, and the calculated SF = 1.79 quantifies the degree of enhancement achieved by piezo-photocatalysis collaboration. The introduction of a moderate amount of H2O2 or peroxymonosulfate (PMS) in the reaction solution plays a significant role in promoting the BPA degradation due to the generation of additional •OH and •SO4− reactive species. The mechanisms for photocatalytic CO2 reduction and piezo-photodegradation of BPA catalysis were deeply studied by combining experiments and theory.

中文翻译：

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强相互作用 FeWO4/BiOCl 异质结构的合成，用于 CO2 的高效光还原和双酚 A 的压电光降解


开发用于二氧化碳减排和消除污染物的多功能光催化剂对于解决环境问题和能源短缺具有实际意义。在这项研究中，我们通过强静电相互作用将 FeWO4 (FWO) 纳米颗粒固定在 (001) 面暴露的 BiOCl (BOC) 纳米片表面，形成 FWO/BOC 异质结。实验和理论研究证实，FWO/BOC异质结表现出高效的Z型转移和光载流子分离，并具有优异的CO2还原和双酚A（BPA）降解光催化作用。在模拟太阳光照射下，9%FWO/BOC异质结表现出光还原性能，CH4/CO收率达到4.25/9.41 μmol g−1 h−1（反应5 h），是普通异质结的3.86/5.26倍。裸 BOC；而其光降解性能（η(60 min) = 66.8 %, kapp = 0.01755 min−1）分别比裸FWO和BOC提高了4.3和2.7倍。此外，当在模拟阳光照射下同时采用超声波振动时，BOC纳米片中超声波诱导的压电极化场加速了体相光载流子分离，从而进一步改善了BPA的降解，计算出的SF = 1.79量化了程度通过压电光催化协作实现的增强。在反应溶液中引入适量的H2O2 或过一硫酸盐(PMS) 由于产生了额外的•OH 和•SO4− 活性物质，因此在促进BPA 降解方面发挥着重要作用。 通过实验与理论相结合，深入研究了光催化CO2还原和BPA催化压电光降解的机理。