工业水处理 ›› 2023, Vol. 43 ›› Issue (12): 146-154. doi: 10.19965/j.cnki.iwt.2022-1211

• 试验研究 • 上一篇    下一篇

BiVO4表面氧空位的调控及其光降解抗生素研究

潘淑颖(), 赵超, 李曼, 胡雪荻   

  1. 山东省土壤污染防治中心,山东 济南 250012
  • 收稿日期:2023-09-21 出版日期:2023-12-20 发布日期:2024-01-11
  • 作者简介:

    潘淑颖(1967— ),研究员,工学博士。E-mail:

Study on the regulation of surface oxygen vacancies in BiVO4 and photodegradation of antibiotics

Shuying PAN(), Chao ZHAO, Man LI, Xuedi HU   

  1. Soil Pollution Prevention and Control Center of Shandong Province,Ji’nan 250012,China
  • Received:2023-09-21 Online:2023-12-20 Published:2024-01-11

摘要:

通过水热法一步合成了BiVO4催化剂,并在氩气气氛下对BiVO4催化剂进行表面改性。通过SEM、TEM、XRD、XPS和PL对BiVO4催化剂进行分析表征,结果表明BiVO4催化剂及改性BiVO4催化剂为单斜状的晶体结构,且改性BiVO4催化剂表面含有大量的氧空位。相比BiVO4催化剂,氧空位BiVO4催化剂的价带由1.97 eV增加至2.13 eV,扩大了带隙,降低了电子和空穴的复合率。在抗生素磺胺甲 唑(SMX)初始质量浓度为10 mg/L,考察了不同因素对氧空位BiVO4催化剂光催化降解SMX的影响,结果表明最佳反应条件为氧空位BiVO4催化剂投加量50 mg/L,反应温度35 ℃,光照度150 mW/cm2,pH 5.0~9.0。此外,研究表明氧空位BiVO4催化体系能够抵御水体中常见阴离子的干扰,但受到腐殖酸的抑制较为明显。对氧空位BiVO4光催化降解SMX进行了机理分析,相对于BiVO4光催化体系,氧空位BiVO4体系产生了更多的活性物质,包括O2 ·-、·OH和h+,氧空位降低了电子和空穴复合率,提高了BiVO4的光催化活性,增强了对SMX的降解速率。整体上,氧空位的调控是提高光生载流子分离率、提高光催化剂活性的有效策略。

关键词: 表面氧空位, 钒酸铋, 抗生素, 催化降解, 光生载流子

Abstract:

BiVO4 catalyst was synthesized in one step by hydrothermal method,and the surface modification of BiVO4 catalyst was carried out in argon atmosphere. The BiVO4 catalyst was characterized by SEM,TEM,XRD,XPS and PL. The results showed that the BiVO4 catalyst and the modified BiVO4 catalyst had monoclinic crystal structure, and the surface of the modified BiVO4 catalyst contained a large number of oxygen vacancies. Compared with BiVO4 catalyst,the valence band of oxygen vacancy BiVO4 catalyst increased from 1.97 eV to 2.13 eV,which enlarged the band gap and decreased the recombination rate of electrons and holes. When the initial mass concentration of antibiotic sulfamethoxazole (SMX) was 10 mg/L,the effects of different factors on the photocatalytic degradation of SMX with oxygen vacancy BiVO4 catalyst were investigated. The results showed that the optimal reaction conditions were 50 mg/L with oxygen vacancy BiVO4 catalyst,35 ℃,150 mW/cm2 and pH 5.0-9.0. In addition,the common anions in water had less interference to the BiVO4 catalytic system of oxygen vacancy,but the inhibition of humic acid was more obvious. The mechanism of photo catalytic degradation of SMX by oxygen vacancy BiVO4 was analyzed. Compared with the BiVO4 photo catalytic system, the oxygen vacancy BiVO4 system produced more active substances,including O2 ·-,·OH and h+. The oxygen vacancy reduced the electron and hole recombination rate,improved the photocatalytic activity of BiVO4 and enhanced the degradation rate of SMX. On the whole,the regulation of oxygen vacancy is an effective strategy to improve the photogenerated carrier separation rate and the activity of photocatalyst.

Key words: surface oxygen vacancy, bismuth vanadate, antibiotics, catalytic degradation, photogenerated carriers

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