Channei Duangdao, Rodsawaeng Natthamon, Jannoey Panatda, Khanitchaidecha Wilawan, Nakaruk Auppatham, Phanichphant Sukon
Department of Chemistry, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand.
Centre of Excellence for Innovation and Technology for Water Treatment, Naresuan University, Phitsanulok 65000, Thailand.
ACS Omega. 2022 Mar 3;7(10):8854-8863. doi: 10.1021/acsomega.1c07169. eCollection 2022 Mar 15.
Bismuth vanadate/coconut fiber (BiVO/CF) composites were synthesized by coprecipitation and calcination methods. All catalysts used in this work were prepared by a simple coprecipitation method and fully characterized by means of XRD, SEM-EDS, PL, BET N adsorption, zeta potential, and UV-vis DRS. Degradation of indigo carmine (IC) under visible light irradiation was tracked by the UV-vis technique. It was documented that XRD patterns of BiVO and BiVO/CF samples retained the monoclinic structure. From SEM, the CF sheets were visualized, covering the surface of BiVO particles. The specific surface area of the synthesized catalysts increased from 1.77 to 24.82 m/g. The shift of absorption edge to a longer wavelength corresponded to a decrease in band gap energy from 2.3 to 2.2 eV. The photocatalytic degradation rate of the BiVO/CF composite was five times higher than that of pristine BiVO. Moreover, the photocatalyst can be separated and recycled with little change after the third times recycling. The improved activity of the composite resulted from the combination of the adsorption performance of the substrate CF and the photocatalytic activity of BiVO. In addition, the position of the specific mechanism could occur via both the active species of superoxide radical and hydroxyl radical.
通过共沉淀和煅烧方法合成了钒酸铋/椰壳纤维（BiVO/CF）复合材料。本工作中使用的所有催化剂均采用简单的共沉淀法制备，并通过XRD、SEM-EDS、PL、BET N吸附、zeta电位和UV-vis DRS进行了全面表征。通过UV-vis技术跟踪了可见光照射下靛蓝胭脂红（IC）的降解情况。据记录，BiVO和BiVO/CF样品的XRD图谱保留了单斜结构。从SEM可以看到，CF片覆盖在BiVO颗粒表面。合成催化剂的比表面积从1.77增加到24.82 m/g。吸收边向更长波长的移动对应于带隙能量从2.3 eV降低到2.2 eV。BiVO/CF复合材料的光催化降解率比原始BiVO高五倍。此外，光催化剂在第三次循环后可以分离并回收，且变化很小。复合材料活性的提高源于底物CF的吸附性能和BiVO的光催化活性的结合。此外，具体的作用机制可能通过超氧自由基和羟基自由基这两种活性物种发生。
