Preparation of BiOI/BiOBr0.9I0.1 photocatalyst and its degradation performance on 2,4-dichlorophenoxyacetic acid
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摘要: 农药污染严重危害生态环境和饮用水安全。采用溶剂热法制备一种新型高效的BiOI/BiOBr0.9I0.1光催化剂。通过XRD、SEM、XPS、UV-vis DRS、PL、EIS等手段表征其结构、形貌和光学性能等理化性质。制备的BiOI/BiOBr0.9I0.1呈团簇状堆积结构,有助于活性位点的增加,固溶体和异质结两种策略的结合拓宽了BiOBr的光响应范围,有效防止光生电子-空穴对在BiOI/BiOBr0.9I0.1内部复合并提高产生光生载流子的氧化还原能力。光催化实验结果表明,合成的15wt%BiOI/BiOBr0.9I0.1在可见光下对2,4-二氯苯氧乙酸(2,4-D)有最佳的光催化性能,120 min降解2,4-D效率最高可达95%,4次循环实验后降解率仍达到80.9%。结合捕获实验与电子自旋共振(ESR)技术结果可以证实•O2−和h+是主要的活性物种。制备的BiOBr0.9I0.1能有效调节BiOBr能带结构。BiOBr0.9I0.1和BiOI构成的异质结符合Z型异质结特点,构建异质结和固溶体两方法之间可在增强BiOBr光催化活性上产生协同作用。
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关键词:
- BiOBr /
- 固溶体 /
- 异质结 /
- 农药 /
- 光催化 /
- 2,4-二氯苯氧乙酸 /
- BiOBr0.9I0.1
Abstract: The pollution of pesticides seriously threatens the ecological environment and drinking water safety. A novel and efficient photocatalyst of BiOI/BiOBr0.9I0.1 was prepared through solvothermal method. The physicochemical properties, such as structure, morphology and optical properties, were characterized by detections of XRD, SEM, XPS, UV-vis DRS, PL, EIS, etc. The BiOI/BiOBr0.9I0.1 synthesized has a cluster-like accumulation structure, which facilitates the increase of active sites. The combination of solid solution and heterojunction broadens the photoresponse range of BiOBr, effectively prevents the recombination of photogenerated electron-hole pairs inside BiOI/BiOBr0.9I0.1 and improves the redox ability of photogenerated carriers. The results of photocatalytic experiments show that 15wt%BiOI/BiOBr0.9I0.1 reaches the best photocatalytic performance for 2,4-dichlorophenoxyacetic acid (2,4-D) under visible light, and the degradation efficiency of 2,4-D can reach 95% within 120 min. Furthermore, the degradation rate still reaches 80.9% after four cycles of experiments. According to the results of capture experiments and electron spin-resonance (ESR) tests, it can be confirmed that •O2− and h+ are the main active species. The BiOBr0.9I0.1 synthesized can effectively modulate the energy band structure of BiOBr. The heterojunction composed of BiOBr0.9I0.1 and BiOI is consistent with the characteristics of Z-scheme heterojunction, and the synergistic effect between the two strategies of constructing heterojunction and solid solution can be produced in enhancing the photocatalytic activity of BiOBr.-
Key words:
- BiOBr /
- solid solution /
- heterojunction /
- pesticide /
- photocatalysis /
- 2,4-dichlorophenoxyacetic acid /
- BiOBr0.9I0.1
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图 7 BiOBr、BiOI、BiOBrxI1-x和Pwt%BiOI/BiOBr0.9I0.1可见光降解2,4-二氯苯氧乙酸(2,4-D)曲线((a)、(b))及对应样品准一级动力学拟合((c)、(d))
Figure 7. Visible light degradation curves of 2,4-dichlorophenoxyaceticacid (2,4-D) by BiOBr, BiOI, BiOBrxI1-x and Pwt%BiOI/BiOBr0.9I0.1 ((a), (b)) and quasi-first-order kinetic fitting of corresponding samples ((c), (d))
Ct—Concentration of 2,4-D at different time t; C0—Initial concentration of 2,4-D; Ka—Apparent rate constants
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