甲醛(HCHO)是主要的室内空气污染物之一,并有效地消除它,特别是在低浓度下,仍然具有挑战性。在这项研究中,采用超声共混技术开发了BiVO4-TiO2催化剂,用于室内低水平HCHO的光催化氧化。晶体结构,表面形态,元素分布,用XRD检测了催化剂的活性氧化物质,SEM,TEM,UV-Vis,EDS,和ESR技术。我们的结果表明,BiVO4-TiO2催化剂,通过超声波共混制备,表现出良好的氧化性能和稳定性。HCHO浓度在48小时内从1.050降至0.030mg/m3,去除率达97.1%。BiVO4和TiO2之间的协同作用提高了分离光生载流子的效率,并最小化了光生电子和空穴之间复合的可能性。此外,这种协同作用显着增强了催化剂上羟基自由基(·OH)的存在,导致氧化性能优于BiVO4或TiO2。我们的研究为开发新的光催化剂解决HCHO污染提供了宝贵的见解。
Formaldehyde (HCHO) is one of the primary indoor air pollutants, and efficiently eliminating it, especially at low concentrations, remains challenging. In this study, BiVO4-TiO2 catalyst was developed using ultrasonic blending technology for the photocatalytic oxidation of low-level indoor HCHO. The crystal structure, surface morphology, element distribution, and active oxidation species of the catalyst were examined using XRD, SEM, TEM, UV-Vis, EDS, and ESR techniques. Our results demonstrated that the BiVO4-TiO2 catalyst, prepared by ultrasonic blending, exhibited good oxidation performance and stability. The HCHO concentration reduced from 1.050 to 0.030 mg/m3 within 48 h, achieving a removal rate of 97.1%. The synergy between BiVO4 and TiO2 enhanced the efficiency of separating photogenerated carriers and minimized the likelihood of recombination between photogenerated electrons and holes. Additionally, this synergy significantly enhanced the presence of hydroxyl radicals (·OH) on the catalyst, resulting in an oxidation performance superior to that of either BiVO4 or TiO2. Our research offers valuable insights for the development of new photocatalysts to address HCHO pollution.