磁性纳米ZnFe_(2)O_(4)/Ag_(3)PO_(4)复合材料的合成及光催化降解性能  

Synthesis and photocatalytic degradation properties of magnetic nano-ZnFe_(2)O_(4)/Ag_(3)PO_(4)composites

作　　者：颜秀花[1] 房娟[1] 唐兰勤[1] YAN Xiuhua;FANG Juan;TANG Lanqin(School of Chemistry and Chemical Engineering,Yancheng Institute of Technology,Yancheng 224051)

机构地区：[1]盐城工学院化学与化工学院,盐城224051

出　　处：《环境科学学报》2025年第1期135-142,共8页Acta Scientiae Circumstantiae

基　　金：盐城市重点研发项目(No.YCBE202309)。

摘　　要：磁性纳米复合材料作为一种具有回收再利用特性的新型催化剂,在环境科学领域受到了广泛的关注.本研究用水热法合成了磁性纳米ZnFe_(2)O_(4)/Ag_(3)PO_(4)复合材料.X射线衍射(XRD)、紫外-可见漫反射光谱(UV-vis DRS)和扫描电子显微镜(SEM)对合成的纳米复合材料进行了表征.同时,研究了ZnFe_(2)O_(4)/Ag_(3)PO_(4)复合材料在可见光下降解亚甲基蓝的催化性能.光催化降解结果表明,复合材料对亚甲基蓝的降解能力受ZnFe_(2)O_(4)与Ag_(3)PO_(4)的物质的量的比影响较大,当ZnFe_(2)O_(4)与Ag_(3)PO_(4)的物质的量的比为0.1∶1时,所得复合材料的光催化活性最高.与纯Ag_(3)PO_(4)相比,ZnFe_(2)O_(4)/Ag_(3)PO_(4)具有优异的结构稳定性和循环利用性能.循环4次后,ZnFe_(2)O_(4)/Ag_(3)PO_(4)的回收率为93.1%,光照60 min对亚甲基蓝的降解率为54.5%,回收率下降了5.1%,亚甲基蓝降解率下降了8.1%,而纯的Ag_(3)PO_(4)样品经过4次循环使用后,回收率下降了50.2%,亚甲基蓝的降解率下降了28.7%,说明ZnFe_(2)O_(4)的加入,提高了复合材料的稳定性和磁回收特性.自由基捕获实验表明空穴(h^(+))和超氧自由基(·O_(2)^(-))是亚甲基蓝降解反应中的主要活性物质.As a new type of catalyst with recycling properties,magnetic nanocomposites have attracted considerable attention in the field of environmental science.In this work,magnetic nano-ZnFe_(2)O_(4)/Ag_(3)PO_(4)composites were synthesized by hydrothermal method.The synthesized nanocomposites were characterized by X-ray diffraction(XRD),UV-vis diffuse reflectance spectroscopy(UV-vis DRS)and scanning electron microscopy(SEM).Meanwhile,the catalytic performance of ZnFe_(2)O_(4)/Ag_(3)PO_(4)composites was investigated for the degradation of methylene blue under visible light.The photocatalytic degradation results indicated that the degradation ability of the composite for methylene blue was strongly affected by the molar ratio of ZnFe_(2)O_(4)to Ag_(3)PO_(4).When the molar ratio of ZnFe_(2)O_(4)to Ag_(3)PO_(4)was 0.1∶1,the photocatalytic activity of the composite was the highest.After 4 cycles,the recovery rate of ZnFe_(2)O_(4)/Ag_(3)PO_(4)was 93.1%,and the degradation rate of methylene blue was 54.5%at 60 minutes,the recovery rate decreased by 5.1%,and the degradation rate of methylene blue decreased by 8.1%.In contrast,those of Ag_(3)PO_(4)decreased by 50.2%and28.7%,respectively.It indicated that the addition of ZnFe_(2)O_(4)improved the stability and magnetic recovery properties of the composite.Furthermore,the free radical trapping experiment showed that holes(h^(+))and superoxide radicals(·O_(2)^(-))were the main oxidative species in the degradation reaction of methylene blue.

关 键 词：ZnFe_(2)O_(4)/Ag_(3)PO_(4)复合材料 光催化降解 稳定性 磁性 

分 类 号：TQ139.2[化学工程—无机化工] X131[环境科学与工程—环境科学]