Department of Chemistry, National Tsing Hua University, Hsinchu, 30013, Taiwan.
Department of Engineering Chemistry, Kolhapur Institute of Technology's College of Engineering (Autonomous), Kolhapur, 416234, India.
Sci Rep. 2020 Aug 3;10(1):12993. doi: 10.1038/s41598-020-69706-4.
The BiVO photocatalyst plays a very important role in photocatalytic reactions attributed to its unique crystalline structure, size, morphology and surface area. Herein, we report a facet-dependent monoclinic scheelite BiVO (m-BiVO) photocatalyst with uniform truncated square (18 sided) hexagonal bipyramidal shape synthesized by a template-free and surfactant-free solvothermal method using ethylene glycol solvent under cost-effective and mild reactions. The structural, morphological and optical properties of the m-BiVO photocatalyst are widely characterized. The photocatalytic activity of the m-BiVO photocatalyst is tested towards 20 ppm methylene blue (MB) dye aqueous solution as a pollutant model under visible light irradiation. Enhanced visible-light driven photoactivity with dye degradation efficiency of approx. 91% at a rate of 0.388 × 10 min is obtained, presumably due to the presence of high-active (040) facets. Zebrafish embryo toxicity test of treated MB dye solution reveals the degradation and toxicity reduction of the MB dye. Moreover, the recycling experiment validates that the m-BiVO photocatalyst has a great structural stability with reliable performance. This work may provide a lucid and expedient strategy to synthesize highly crystalline (040) facet-dependent semiconductor photocatalyst toward dye degradation and obviously industrial wastewater remediation.
BiVO 光催化剂因其独特的晶体结构、尺寸、形态和表面积在光催化反应中起着非常重要的作用。在此，我们报道了一种通过无模板和无表面活性剂的溶剂热法，在乙二醇溶剂中，在经济高效和温和的反应条件下，合成具有均匀截角八面体（18 面）六方双锥形状的面依赖性单斜白钨矿 BiVO（m-BiVO）光催化剂。广泛表征了 m-BiVO 光催化剂的结构、形态和光学性质。以 20 ppm 亚甲基蓝（MB）染料水溶液为污染物模型，在可见光照射下测试了 m-BiVO 光催化剂的光催化活性。得到了约 91%的染料降解效率和 0.388 × 10 min 的高可见光驱动光活性，这可能归因于高活性（040）面的存在。处理过的 MB 染料溶液的斑马鱼胚胎毒性试验表明，MB 染料发生了降解，毒性降低。此外，循环实验验证了 m-BiVO 光催化剂具有良好的结构稳定性和可靠的性能。这项工作可能为合成高度结晶的（040）面依赖半导体光催化剂提供了一种清晰、简便的策略，用于染料降解和明显的工业废水修复。
