Anwer Hassan, Park Jae-Woo
Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seoul 133-791, South Korea.
Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seoul 133-791, South Korea.
J Hazard Mater. 2018 Sep 15;358:416-426. doi: 10.1016/j.jhazmat.2018.07.019. Epub 2018 Jul 8.
Synergy between surface adsorption and photocatalysis is key for effective contaminant degradation in the liquid phase. Herein, we report a heterojunction photocatalyst of reduced graphene oxide (rGO)/zirconium dioxide (ZrO)/silver phosphate (AgPO) that incorporates this synergy for 4-nitrophenol (PNP) removal. Compared with other photocatalyst combinations, ZrO and AgPO coupling generates reactive species with greater degradation potential. ZrO and rGO were synthesized by a green approach using a one-step hydrothermal reaction in ethanol-water. The growth of rGO/ZrO and AgPO were accomplished and the functions of each part were well developed together. The rGO/ZrO/AgPO composite exhibited enhanced light absorption and a low band gap energy (2.3 eV) owing to rGO and AgPO integration. The composite's photocatalytic activity was much higher than that of ZrO, AgPO, or ZrO/AgPO. The maximal adsorption of PNP was 26.88 mg/g, and a pseudo-first-order model described the PNP degradation kinetics (k = 0.034 min). Synergy between the three components resulted in 97% PNP removal in 90 min, and even after five cycles, 94% PNP removal was obtained. The quantum yield of the system (7.31 × 10 molecules/photon) was compared with those in previous reports to assess the photocatalytic performance and energy requirements.
表面吸附与光催化之间的协同作用是液相中有效降解污染物的关键。在此，我们报道了一种还原氧化石墨烯（rGO）/二氧化锆（ZrO）/磷酸银（AgPO）的异质结光催化剂，该催化剂利用这种协同作用来去除4-硝基苯酚（PNP）。与其他光催化剂组合相比，ZrO和AgPO耦合产生具有更大降解潜力的活性物种。ZrO和rGO通过在乙醇-水中一步水热反应的绿色方法合成。rGO/ZrO和AgPO的生长得以完成，且各部分的功能得以共同良好发展。由于rGO和AgPO的整合，rGO/ZrO/AgPO复合材料表现出增强的光吸收和低带隙能量（2.3 eV）。该复合材料的光催化活性远高于ZrO、AgPO或ZrO/AgPO。PNP的最大吸附量为26.88 mg/g，并且伪一级模型描述了PNP的降解动力学（k = 0.034 min）。三种组分之间的协同作用导致在90分钟内97%的PNP被去除，甚至在五个循环后，仍能实现94%的PNP去除率。将该系统的量子产率（7.31×10分子/光子）与先前报道中的量子产率进行比较，以评估光催化性能和能量需求。
