摘要
水资源短缺和人类生产生活需水量的增加使污水净化处理这一话题变热。高级氧化工艺因其高效、环境友好且没有二次污染成为一种行之有效的处理污水方法。其中最具代表性的就是光催化技术和芬顿技术。通过调整工艺参数,采用水热法和煅烧法制备了3种不同形貌的ZnFe_(2)O_(4)纳米晶,即微球状(ZFO-1)、空心球状(ZFO-2)和正六边形状(ZFO-3)。通过XRD、SEM、HRTEM、UV-vis、电化学阻抗谱(EIS)和瞬态光电流响应测试等,对样品的微观结构、形貌、元素组成和光电化学性能进行表征。此外,ZnFe_(2)O_(4)纳米晶光芬顿性能是通过对罗丹明B(RhB)的降解所得出的。结果表明:所制备的3种ZnFe_(2)O_(4)纳米晶均具有立方尖晶石结构和良好的结晶度。ZFO-2表现出优异的可见光吸收能力和最窄的带隙,并发生红移现象。EIS测试表明,ZFO-2的转移内阻最小且瞬态光电流最大,具有优异的光生载流子的迁移和分离能力。ZFO-1、ZFO-2、ZFO-3催化剂的光芬顿降解效率依次为88.2%、97.6%和48.1%,表明具有良好的降解性能。综合得到,ZFO-2具备优异的光降解性能。并探讨了可能的光芬顿降解RhB催化机制。
The shortage of water resources and the increase of water demand for human production and life have made the topic of wastewater purification and treatment hot.The advanced oxidation process has become a proven method to treat wastewater because it is efficient,environmentally friendly and free of secondary pollution.The most representative ones are photocatalytic technology and Fenton technology.Three different morphologies of ZnFe_(2)O_(4)nanocrystals,namely microspherical(ZFO-1),hollow spherical(ZFO-2)and orthohexagonal(ZFO-3),were prepared by hydrothermal and calcination methods by adjusting the process parameters.The microstructure,morphology,elemental composition and photoelectrochemical properties of the samples were characterized by XRD,SEM,HRTEM,UV-vis,electrochemical impedance spectroscopy(EIS)and transient photocurrent response tests.Furthermore,the ZnFe_(2)O_(4)nanocrystal photo-Fenton properties were derived from the degradation of rhodamine B(RhB).The results show that all three prepared ZnFe_(2)O_(4)nanocrystals have cubic spinel structure and good crystallinity.ZFO-2 exhibits excellent visible light absorption and the narrowest band gap with red-shift phenomenon.EIS tests show that ZFO-2 has the lowest internal resistance to transfer and the highest transient photocurrent,with excellent migration and separation of photogenerated carriers.The photo-Fenton degradation efficiencies of ZFO-1,ZFO-2 and ZFO-3 catalysts are 88.2%,97.6%and 48.1%in order,indicating good degradation performance.The comprehensive obtained,ZFO-2 has excellent photodegradation performance.And the possible catalytic mechanism of photo-Fenton degradation of RhB was discussed.
作者
李智铭
魏智强
李超
韩明君
王青
赵玉峰
LI Zhiming;WEI Zhiqiang;LI Chao;HAN Mingjun;WANG Qing;ZHAO Yufeng(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,School of Science,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2024年第2期795-803,共9页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(52268042)
甘肃省自然科学基金(22JR5RA253)
兰州理工大学红柳一流学科发展项目。
