Fluorine-doped BiVO4 photocatalyst: Preferential cleavage of C-N bond for green degradation of glyphosate.
Fluorine-doped BiVO4 photocatalyst: Preferential cleavage of C-N bond for green degradation of glyphosate.
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DOI：
10.1016/j.jes.2022.04.013
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发表时间：
2022-04
影响因子：
6.9
通讯作者：
Yuxiang Chen;Yingping Huang;H. Tian;Liqun Ye;Rui-ping Li;Chuncheng Chen;Zhongxu Dai;Di Huang
中科院分区：
文献类型：
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作者：
Yuxiang Chen;Yingping Huang;H. Tian;Liqun Ye;Rui-ping Li;Chuncheng Chen;Zhongxu Dai;Di Huang
随着对环境和人类健康的日益关注，通过形成毒性较小的中间体来降解草甘膦具有重要意义。在已开发的草甘膦降解方法中，光降解是一种清洁高效的策略。在本工作中，我们报道了一种新的光催化剂，通过在BiVO 4上掺杂F离子，与BiVO 4催化剂相比，它可以有效地降解草甘膦，并通过选择性的（P）−C−N断裂来减少氨甲基膦酸（AMPA）的有毒排放。结果表明，在pH = 9时，0.3F@BiVO4催化剂对AMPA的抑制效果最好（AMPA生成量低于10%）;原位衰减全反射傅里叶变换红外光谱（ATR-FTIR）表明，由于静电作用的不同，草甘膦在BiVO 4和0.3F@BiVO4上的吸附位点发生了变化。这种吸收改变导致N-C-P骨架上的C-N键优先断裂，从而抑制有毒AMPA的形成。这些结果加深了我们对BiVO 4基催化剂催化草甘膦光降解过程的理解，为草甘膦的非生物降解提供了一条安全的途径。
With increasing concerns on the environment and human health, the degradation of glyphosate through the formation of less toxic intermediates is of great importance. Among the developed methods for the degradation of glyphosate, photodegradation is a clean and efficient strategy. In this work, we report a new photocatalyst by doping F ion on BiVO4that can efficiently degrade glyphosate and reduce the toxic emissions of aminomethylphosphonic acid (AMPA) through the selective (P)−C−N cleavage in comparison of BiVO4catalyst. The results demonstrate that the best suppression of AMPA formation was achieved by the catalyst of 0.3F@BiVO4at pH = 9 (AMPA formation below 10%).In situattenuated total reflectance Fourier transforms infrared (ATR-FTIR) spectroscopy indicates that the adsorption sites of glyphosate on BiVO4and 0.3F@BiVO4are altered due to the difference in electrostatic interactions. Such an absorption alteration leads to the preferential cleavage of the C−N bond on the N−C−P skeleton, thereby inhibiting the formation of toxic AMPA. These results improve our understanding of the photodegradation process of glyphosate catalyzed by BiVO4-based catalysts and pave a safe way for abiotic degradation of glyphosate.