摘要
采用共沉淀-回流法制成g-C_(3)N_(4)/Fe_(3)O_(4)/BiOI磁性复合材料作为异相光助芬顿(Fenton)催化剂。运用扫描电镜(SEM)、透射电镜(TEM)、X-射线衍射(XRD)、振动样品磁强计(VSM)和N_(2)吸附-脱附等手段分别对催化剂的形貌、结构、组成、磁性和比表面积等进行了表征,并以罗丹明B(RhB)为模型污染物考察了材料的可见光催化性能。实验结果表明,当BiOI的负载质量为50%时,在可见光照射下,复合材料具有最好的光催化性能,180 min内对RhB的降解效率可达到99.20%。较高的光催化性能归因于所制备材料对RhB较强的吸附、强烈的可见光响应以及异质结构促进了光生载流子的分离。进一步在光催化体系中加入适量的H_(2)O_(2)后,可极大提高三元复合材料可见光助Fenton降解RhB的效率,30 min内即可达到98.44%,这得益于体系中发生Fenton反应产生较多具有强氧化性的羟基自由基,同时光生电子可加速Fe^(3+)/Fe^(2+)的氧化还原循环,提升了Fenton反应效率。且催化剂经循环使用5次后,仍保持良好的可见光助Fenton活性与磁性能。
In this paper,the magnetically separable g-C_(3)N_(4)/Fe_(3)O_(4)/BiOI nanocomposites were synthesized as the heterogeneous photo-Fenton catalyst by the co-precipitation-reflux method.The morphologies,microstructure,compositions,magnetic properties and specific surface areas of the samples were characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),vibrating sample magnetometry(VSM)and Brunauer–Emmett–Teller analysis(BET),respectively.And the photocatalytic performance of the materials were evaluated through the degradation of Rodamine B(RhB)under visible light irradiation.The nanocomposites with 50%BiOI(mass percent)were found to have the best photocatalytic activity with a degradation rate of 99.20%in 180 min under visible light irradiation.The higher photocatalytic activity was attributed to the strong adsorption of RhB and the strong absorption of visible light as well as the heterojunctions that facilitate the separation of photogenerated carriers.In addition,when an amount of H_(2)O_(2) was added into the photocatalytic system,the photocatalytic activity of the ternary nanocomposite can be greatly improved with a degradation rate of 98.44%in 30 min.This may benefit from more highly oxidative hydroxyl radicals produced by the Fenton reaction and the accelerated redox cycling of Fe^(3+)/Fe^(2+)enhancing the efficiency of the Fenton reaction.Moreover,the nanocomposite still maintained a good photo-Fenton catalytic and magnetic properties after five successive cycles.
作者
周慧
金党琴
杜彬
李亚男
肖伽励
王珏
ZHOU Hui;JIN Dang-qin;DU Bin;LI Ya-nan;XIAO Jia-li;WANG Jue(School of Chemical Engineering,Yangzhou Polytechnic Institute,Yangzhou 225127,China)
出处
《化学研究与应用》
CAS
北大核心
2023年第1期113-122,共10页
Chemical Research and Application
基金
国家自然科学基金资助项目(21673201)资助
江苏省环境污染物传感检测及治理工程研究中心(苏发改高技发[2020]1460号)资助
江苏省高等学校基础科学(自然科学)研究重大项目(22KJB156)资助
扬州工业职业技术学院自然科学类2021年重点课题(2021xjzk004)资助。
