Trinh Dang Trung Tri, Channei Duangdao, Nakaruk Auppatham, Khanitchaidecha Wilawan
Department of Civil Engineering, Faculty of Engineering, Naresuan University, Phitsanulok, 65000, Thailand.
Centre of Excellence for Innovation and Technology for Water Treatment, Naresuan University, Phitsanulok, 65000, Thailand.
Sci Rep. 2021 Feb 25;11(1):4620. doi: 10.1038/s41598-021-84323-5.
The nanocomposite of BiVO-based material has been synthesized by one-step solvent method. The morphological, physical, chemical properties of the nanocomposite have been investigated. The results revealed that the surface area of BiVO, BiVO/SiO and BiVO/SiO/GO was 11.13, 28.47 and 43.93 m/g, respectively. The structural test by XRD proved that the nanocomposites were monoclinic phase of bismuth vanadate. Adsorption and photocatalytic degradation were two main mechanisms that strongly related to pollutant removal efficiency (i.e., methylene blue and phenol). The BiVO/SiO/GO nanocomposite obtained the greatest MB removal efficiency due to its high adsorption ability from high surface area, whereas the photocatalytic degradation was insignificant mechanism. In contrast, the relatively low adsorption ability of BiVO/SiO/GO nanocomposite was observed when the pollutant was phenol due to negative charge and high stability of phenoxide ions, then the photocatalytic degradation became the main mechanism for phenol removal. The phenol removal efficiency reached approximately 70% in 6 h with HO assistance. The combination of SiO and GO improved the surface property of BiVO-based photocatalyst, however the excessive combination ratio generated the excellent adsorbent material rather than the photocatalyst. Hence, the optimal combination ratio is essential to archive the greatest nanocomposite for photocatalytic application.
采用一步溶剂法合成了基于BiVO的纳米复合材料。对该纳米复合材料的形态、物理和化学性质进行了研究。结果表明，BiVO、BiVO/SiO和BiVO/SiO/GO的比表面积分别为11.13、28.47和43.93 m²/g。XRD结构测试证明纳米复合材料为钒酸铋单斜相。吸附和光催化降解是与污染物去除效率（即亚甲基蓝和苯酚）密切相关的两个主要机制。BiVO/SiO/GO纳米复合材料由于其高比表面积的高吸附能力而获得了最大的亚甲基蓝去除效率，而光催化降解是次要机制。相比之下，当污染物为苯酚时，由于酚氧离子的负电荷和高稳定性，观察到BiVO/SiO/GO纳米复合材料的吸附能力相对较低，此时光催化降解成为苯酚去除的主要机制。在有羟基自由基（·OH）协助的情况下，苯酚在6小时内的去除效率达到约70%。SiO和GO的组合改善了基于BiVO的光催化剂的表面性质，然而，过高的组合比例产生的是优异的吸附材料而非光催化剂。因此，最佳组合比例对于获得用于光催化应用的最佳纳米复合材料至关重要。
