双助催化剂担载钒酸铋光催化降解草甘麟的研究

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中图法分类号：S131+.3 文献标识码：A 文章编号：1000-2324（2025）04-0557-09

Photocatalytic Degradation ofGlyphosate byBismuth Vanadate with Dual Cocatalyst

ZHANG Yan， WANG Wen-jia， LIU Lu-lu， YE Sheng

AgriculturaloctlisbotoolteraldstcltualUesitye Abstract：To avoid secondary pollution during the process of pesticide residue treatment，we actively research related pesticide degradation methods.Bismuth vanadate （BiVO4） ）isaneasily accessible，highlystable，and safen-type semiconductor withexcelent ightabsorptionrange，controllable microstructure，moderatenanoscale size，andrecyclability afterfiltration.Itis widelyusedinthefieldsofphotocatalysisandphotoelectrocatalysis，butitfacesissuessuchasevere recombinationofphotogeneratedelectronsand holes，andlowquantumyield.However，ithasissessuchassevere recombination of photogenerated electrons and holes，and lowquantum yield.Photodeposition is a simpleand easy-tooperate methodthatinvolves depositing cocatalysts ondiferent crystal planes to further enhance the separationand transfer eficiencyof photogeneratedcharges，significantly improvingphotocatalyticperformanceWeadoptaphotocatalytic degradation technologyforpesticides thatcombines"nanomaterialswithgreenagriculture，"achievingdirectconversion fromsolar energy to chemical energy.Under visible lightconditions，weconducted pesticide degradation experiments comparing the photocatalytic performance of BiVO4. CoOx/BiVO4， （20 Pt/BiVO4 ，and Pt/CoO⋅X/BiVO⋅4， ，identifying the optimal combination for BiVO4 photocatalysts with dual cocatalysts. The results show that under the same applied voltage， Pt/CoOx/ BiVO4 has the highest photocurrentresponse andthe smallest interfacial charge transferresistance，demonstrating excellent charge separation properties. Pt/CoOx/BiVO4 degradesthe fastest，completingdegradationin360minutes，withadegradation rate 50 times that of the BiVO4 bulk.This study，through a crystal facet engineering strategy to control the separation of photogenerated charges insemiconductors，provides guidance fordesigning new highlyactive photocatalytic systems for pesticide degradation.

Keywords：Photocatalysis; agriculture; degradation of glyphosate; dual cocatalysts

过去30年，我国为了提高粮食产量、满足不断增长的人口需求，过度使用和依赖多种农药，其中70%～80% 的农药直接渗透到环境中，导致土壤污染、水体污染、空气污染的风险增加，并进一步进入生物链，对所有环境生物和人类健康都具有严重的、长期的和潜在的危害性[12]。（剩余10285字）