Huang Jingyuan, Ma Yueyong, Chen Qianqian, Zhu Jinyan, Jiang Hongyi, Li Hanliang, Yi Lian, Li Haiyan, Hong Mei
State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China.
State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China.
Chemosphere. 2022 Jul;299:134454. doi: 10.1016/j.chemosphere.2022.134454. Epub 2022 Mar 29.
Nowadays, nano-photocatalysts (NPs) have become the research focus in the field of photocatalysis due to their excellent photocatalytic activity, and microemulsion is an effective method to prepare high-efficiency nano-photocatalysts. Here, BiVO NPs with high efficiency under visible light were prepared by a combination of reverse microemulsion method and calcination method. XRD, SEM, TEM, XPS, DRS, PL, BET and other characterization tests were used to comprehensively explore the influence of water-oil ratio on the physicochemical properties of the catalysts. The results show that BiVO NPs of monoclinic scheelite with high crystallization degree can be obtained by this method. The microscopic morphology, specific surface area and total pore volume of BiVO NPs are significantly affected by the water-oil ratio. It is difficult to obtain BiVO NPs with small particle size and uniform dispersion under the condition of too low or too high water-oil ratio. Meanwhile, the photogenerated carrier recombination efficiency of the catalyst is significantly improved, thus reducing the photocatalytic activity of the catalyst. Strikingly, the BiVO NPs obtained under the condition of water-oil ratio is 20 exhibited well-dispersed nanospheres with diameters ranging from 80 to 100 nm. It has the highest photocatalytic activity due to its high crystallinity, large specific surface area and total pore volume and relatively low photogenerated carrier recombination efficiency. Under visible light irradiation, the degradation efficiency of RhB can reach 97.69% in 100 min, and the rate constant is 0.03253 min.
如今，纳米光催化剂（NPs）因其优异的光催化活性已成为光催化领域的研究热点，而微乳液法是制备高效纳米光催化剂的有效方法。在此，通过反相微乳液法和煅烧法相结合制备了在可见光下具有高效性能的BiVO NPs。利用XRD、SEM、TEM、XPS、DRS、PL、BET等表征测试手段全面探究了水油比对催化剂物理化学性质的影响。结果表明，通过该方法可获得结晶度高的单斜白钨矿型BiVO NPs。BiVO NPs的微观形貌、比表面积和总孔体积受水油比的影响显著。在水油比过低或过高的条件下，难以获得粒径小且分散均匀的BiVO NPs。同时，催化剂的光生载流子复合效率显著提高，从而降低了催化剂的光催化活性。值得注意的是，在水油比为20的条件下获得的BiVO NPs呈现出直径为80至100 nm的分散良好的纳米球。由于其高结晶度、大比表面积和总孔体积以及相对较低的光生载流子复合效率，它具有最高的光催化活性。在可见光照射下，100分钟内RhB的降解效率可达97.69%，速率常数为0.03253 min⁻¹ 。
