天然磁赤铁矿赋磁的Bi2WO6材料制备及其光催化降解异丁基黄药的研究

刘波; 聂倩倩; 左霜霜; 崔云佩; 谢广元; 刘嘉友; 俞和胜

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (10) : 5459-5470.

水污染与控制

天然磁赤铁矿赋磁的Bi₂WO₆材料制备及其光催化降解异丁基黄药的研究

刘波¹, 聂倩倩², 左霜霜¹, 崔云佩¹, 谢广元¹, 刘嘉友³, 俞和胜¹

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Magnetization of Bi₂WO₆ composite by using natural maghemite and its application in photocatalytic degradation of isobutyl xanthate

LIU Bo¹, NIE Qian-qian², ZUO Shuang-shuang¹, CUI Yun-pei¹, XIE Guang-yuan¹, LIU Jia-you³, YU He-sheng¹

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摘要

将天然磁赤铁矿γ-Fe₂O₃用SiO₂纳米颗粒包覆后与Bi₂WO₆复合制备磁性光催化剂γ-Fe₂O₃@SiO₂/Bi₂WO₆,采用XRD,FESEM,XPS,VSM等方法对样品进行表征.VSM测试结果表明γ-Fe₂O₃@SiO₂/Bi₂WO₆具有磁性,可通过磁力回收复用.相较于Bi₂WO₆,γ-Fe₂O₃@SiO₂/Bi₂WO₆光催化降解异丁基黄药的性能略有下降,5%γ-Fe₂O₃@SiO₂/Bi₂WO₆在60min内仍能完全降解60mg/L的异丁基黄药,且TOC测试结果显示异丁基黄药废水的矿化程度为76.86%.5次循环实验结果显示γ-Fe₂O₃@SiO₂/Bi₂WO₆的催化活性几乎没有下降,异丁基黄药降解效率均保持在99%以上,且材料的回收率高达82.00%,证明了γ-Fe₂O₃@SiO₂/Bi₂WO₆的稳定性和可回用性.通过牺牲剂实验以及ESR测试表明·O₂^-是异丁基黄药降解过程的主要活性基团.最后,通过DFT计算确定了催化剂表面和黄药的活性位点分别是W原子和S原子.

Abstract

Natural maghemite (γ-Fe₂O₃) particles were coated with SiO₂ and combined with Bi₂WO₆ to prepare a magnetic photocatalyst γ-Fe₂O₃@SiO₂/Bi₂WO₆. The samples were characterized by multiple means of XRD, FESEM, XPS and VSM. The VSM tests indicated that γ-Fe₂O₃@SiO₂/Bi₂WO₆ possesses magnetic properties, allowing for magnetic recovery and reuse. Compared with Bi₂WO₆, the catalytic performance of γ-Fe₂O₃@SiO₂/Bi₂WO₆ for degrading isobutyl xanthate slightly decreases, but the 5%γ-Fe₂O₃@SiO₂/Bi₂WO₆ can almost completely degrade isobutyl xanthate (60mg/L) within 60min, and the TOC test results showed that the mineralization degree of isobutyl xanthate wastewater was as high as 76.86%. The results of cyclic experiments showed that catalytic activity of γ-Fe₂O₃@SiO₂/Bi₂WO₆ hardly decreased after 5cycles. The degradation efficiency of isobutyl xanthate stabilized over 99% and the recovery rate of 5%γ-Fe₂O₃@SiO₂/Bi₂WO₆ was as high as 82.00%. It proved the stability and recyclability of the prepared γ-Fe₂O₃@SiO₂/Bi₂WO₆ composites. Sacrificial agent experiments and ESR tests indicated that ·O₂^- was the predominant species in the photo-degradation process of isobutyl xanthate. Finally, DFT calculations confirmed that the active sites on the catalyst surface and xanthate were W atom and S atom, respectively.

导出引用

刘波, 聂倩倩, 左霜霜, 崔云佩, 谢广元, 刘嘉友, 俞和胜. 天然磁赤铁矿赋磁的Bi₂WO₆材料制备及其光催化降解异丁基黄药的研究[J]. 中国环境科学. 2025, 45(10): 5459-5470

LIU Bo, NIE Qian-qian, ZUO Shuang-shuang, CUI Yun-pei, XIE Guang-yuan, LIU Jia-you, YU He-sheng. Magnetization of Bi₂WO₆ composite by using natural maghemite and its application in photocatalytic degradation of isobutyl xanthate[J]. China Environmental Science. 2025, 45(10): 5459-5470

中图分类号： X703

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