摘要
该实验制备了Au/g-C_(3)N_(4)复合纳米材料,并通过X射线衍射(X-ray diffraction,XRD)、傅里叶变换红外(Fourier transform infrared spectrometry,FT-IR)、透射电子显微镜(Transmission electron microscope,TEM)和紫外可见漫反射(Ultraviolet-visible diffuse reflectance spectroscopy,UV-Vis DRS)等手段对其进行了表征。为研究Au/g-C_(3)N_(4)对赭曲霉毒素A(OchratoxinA,OTA)的光催化降解作用,在可见光照射下,进行了吸附平衡实验,考察了材料的光催化性能,比较了纳米金颗粒(AuNPs)浓度和Au/g-C_(3)N_(4)不同添加量对光催化效果的影响。结果表明:Au/g-C_(3)N_(4)复合纳米材料被成功制备,AuNPs均匀分布于石墨相氮化碳(g-C_(3)N_(4))表面,采用OTA初始浓度为5μg/mL,催化材料用量为2 mg/mL,在可见光照射180 min后OTA降解率可达95.84%。重复性实验发现Au/g-C_(3)N_(4)复合纳米材料可以重复使用,在使用5次后降解率仍然可以达到85.82%。通过自由基捕获实验确定了·O_(2)^(-)和h^(+)在Au/g-C_(3)N_(4)光催化降解过程中起主导作用。研究结果表明,Au/g-C_(3)N_(4)复合材料可安全高效地去除OTA,可为光催化降解食品中的OTA提供了理论参考和实践基础。
In this study,Au/g-C_(3)N_(4) composite nanomaterials were prepared and characterized by X-ray diffraction(XRD),Fourier transform infrared(FT-IR),transmission electron microscopy(TEM)and ultraviolet-visible diffuse reflectance(UV-Vis DRS).The photocatalytic degradation of ochratoxin A(OTA)by Au/g-C_(3)N_(4) composite nanomaterials under different factors was compared and the photodegradation mechanism was investigated.Adsorption equilibrium experiments were carried out under visible light irradiation to studythe photocatalytic properties of the materials,and the effects of the concentration of AuNPs and the amount of Au/g-C_(3)N_(4) on the photocatalytic efficiency were also studied.The results showed that the Au/g-C_(3)N_(4) composite nanomaterials were successfully prepared,with AuNPs uniformly distributed on the surface of graphitic carbon nitride(g-C_(3)N_(4)).The photocatalytic degradation experiments showed that the OTA degradation rate could reach 95.84%after 180 min of irradiation with a xenon lamp(500 W)under the optimal conditions with an initial concentration of 5μg/mL of OTA and 2 mg/mL of Au/g-C_(3)N_(4) catalyst.Repeatability experiments revealed that the Au/g-C_(3)N_(4) composite nanomaterials could be reused,and the degradation efficiency could still remain at 85.82%after 5 times.The free radical trapping experiments confirmed that·O_(2)^(-)and h^(+)played a dominant role in the photocatalytic degradation of OTA by the Au/g-C_(3)N_(4) catalyst.This study could provide important theoretical support for the development of highly effective catalyst for the detection of OTA.
作者
韦迪哲
翟文磊
王渊
王蒙
WEI Dizhe;ZHAI Wenlei;WANG Yuan;WANG Meng(Beijing Academy of Agriculture and Forestry Sciences,Beijing 100097)
出处
《食品工业科技》
北大核心
2025年第22期291-297,共7页
Science and Technology of Food Industry
基金
国家自然科学基金项目(32102056)
北京市农林科学院科技创新能力建设专项(KJCX20230217)。
关键词
赭曲霉毒素A
光催化降解
石墨相氮化碳
降解机理
结构表征
吸附性能
稳定性
ochratoxin A
photocatalytic degradation
graphite phase carbon nitride
mechanism of degradation
structural characterization
adsorption performance
stability
