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液相法制备BiVO4微纳米材料研究进展
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Abstract:
BiVO4作为一种优良的半导体材料，在光催化领域内引起了人们广泛的关注。与其他半导体材料相比，单相晶相BiVO4有着更低的带隙能(约2.4 eV)，因此在可见光区的响应特性，赋予了其优越的光催化性能。本论文综述了BiVO4微纳米材料的常见液相合成法，包括水热法、共沉淀法、溶胶–凝胶法、微乳液法等。针对单一BiVO4光生电子和空穴易复合、迁移速率较慢等缺点，本文归纳了几种改性方法：形貌调控，调节其形状及比表面积大小，实现BiVO4的光催化能力的提高；构建异质结，与半导体材料、贵金属等复合，改变其表面组成，从而提高BiVO4的光催化性能。最后分析了目前的制备方法中的不足之处并提出展望。
As an excellent semiconductor material, BiVO4 has attracted wide-spread attention in the field of photocatalysis. In comparison with other common semiconductor materials, the monoclinic has a lower band gap energy (about 2.4 eV) and thereby exhibiting visible light responsive and excellent photocatalytic properties. In this work, we will overview the common liquid-phase synthetic methods of BiVO4 micro/nanomaterials, including the hydro-thermal method, co-precipitation method, sol-gel method, and microemulsion method. In addition, in view of the shortcomings of easy recombination of photogenerated electrons and holes, and slow migration rate, several modification methods for prime BiVO4 are introduced. Mor-phology control: adjust its shape and specific surface area to achieve the enhancement of photo-catalytic/adsorption capacity of BiVO4. Construction of heterojunction: compound with semiconductor materials, and noble metals to change its surface composition to improve the pho-tocatalytic performance of BiVO4. Finally, the drawbacks of the current preparation methods are analyzed and prospects are proposed.
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