| 陈寒阳,李瑞桢,陈宇,杜立君,胡禹,许晓樱,熊建蓉,程佳佳.BiOCl/BiPO4复合光催化剂的制备及其性能研究[J].分子催化,2021,35(2):130-140 |
| BiOCl/BiPO4复合光催化剂的制备及其性能研究 |
| Preparation of BiOCl/ BiPO4 Photocatalyst Composite and Its Properties Study |
| 投稿时间：2020-11-18 修订日期：2020-12-07 |
| DOI：10.16084/j.issn1001-3555.2021.02.004 |
| 中文关键词: BiPO4 BiOCl p-n异质结 有机染料 |
| 英文关键词:BiPO4 BiOCl p-n heterojunction organic dye |
| 基金项目:国家自然科学基金资助项目（61601313）；国家环境保护水土污染协同控制与联合修复重点实验室开放基金（GHBK-004）；自贡市重点科技计划项目（2020YGJC04）；省级大学生创新创业训练计划项目（S201910622047） |
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| 中文摘要: |
| 采用溶剂热法制备了BiPO4纳米棒，再采用沉积沉淀法在BiPO4纳米棒上沉积了不同质量比的BiOCl纳米片形成一系列的BiOCl/BiPO4复合材料.利用扫描电镜、透射电镜、X射线衍射和紫外可见漫反射光谱等手段对所合成的材料的物理化学性能进行了表征，并通过测试光电流、电化学阻抗、光致发光光谱等，并进行光催化降解甲基橙和酸性红Ⅰ染料废水实验，评价了所合成材料的光电化学性能和光催化性能.研究结果表明，BiOCl纳米片（直径范围为100～400 nm）已成功沉积在BiPO4纳米棒（直径100~200 nm、长度0.3~1.4 μm）表面形成复合材料，复合材料没有改变单一材料的晶型和结晶度，其由结晶度较高的独居石结构单斜型BiPO4和正方相BiOCl组成.与单一BiPO4纳米棒相比，复合材料的光吸收范围更宽，光催化活性增强，最佳质量比（0.2）的复合材料在光照15 min时对甲基橙的降解率达到96.69%，在光照6 min时对酸性红降解率达到96.21%.根据光电化学性能测试结果，复合材料比单一材料具有更好的光生电荷分离效率、转移效率及更慢的复合速率.通过自由基捕获实验及材料的能带结构测算和验证，进一步分析了复合材料的光催化机理及复合材料光催化活性增强的原因是形成了p-n异质结. |
| 英文摘要: |
| BiPO4 nanorods were prepared by solvothermal method. BiOCl/BiPO4 composite with different mass ratio and pristine BiOCl nanosheets have been successfully synthesized using deposition–precipitation method. The physicochemical properties of as-prepared samples were characterized by X-ray powder diffraction(XRD), scanning electron microscopy(SEM), UV–vis absorption spectroscopy, photoluminescence spectroscopy and so on. Moreover, the photoelectrochemical properties and the photocatalytic performances of as-prepared samples wereevaluated by conducting photocurrent test, electrochemical impedance spectroscopy, photoluminescence spectra, and photocatalytic degradation experiments of methyl orange and acid red Ⅰ. The results showed that BiOCl nanosheets with 100~400 nm diameter was successfully deposited on the BiPO4 nanorods with 100~200 nm diameter and 0.3~0.4 μm length. The composite was formed without changing the crystal structure and crystallinity. The composite was composed of monoclinic BiPO4 with monazite structure and tetragonal BiOCl. These two components both have high crystallinity. Compared to pure BiPO4 nanorods, the as-synthesized BiOCl/BiPO4 compound showed wider light absorption range andenhanced photocatalytic performance. The composite with optimal mass ratio (0.2) can degrade 96.69% of methyl orange (50 mL, 10 mg/L) and 96.21% of acid red Ⅰ (50 mL, 10 mg/L) under 15 min and 6 min UV light illumination, respectively. According to the results of photoelectrochemical properties tests, the composite possesses better photogenerated charge separation and migration efficiency, lower charge recombination efficiency than single semiconductors. The photocatalytic mechanism and the reason of enhanced photocatalytic performance of the compositeis formed a p-n heterojunction that befurther analyzed by carrying out radical capture experiments, the calculation and verification of energy band structure of prepared samples. |
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