Porous " brick-like" NiFe2O4 nanocrystals loaded with Ag species towards effective degradation of toluene
Porous " brick-like" NiFe2O4 nanocrystals loaded with Ag species towards effective degradation of toluene
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DOI：
10.1016/j.cej.2010.08.060
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发表时间：
2010-11
影响因子：
15.1
通讯作者：
Zhengru Zhu;Xinyong Li;Qidong Zhao;H. Li;Yu Shen;Guohua Chen
中科院分区：
文献类型：
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作者：
Zhengru Zhu;Xinyong Li;Qidong Zhao;H. Li;Yu Shen;Guohua Chen
采用改进的化学共沉淀法，分别在773K、873K和973K的焙烧温度下合成了多孔和砖状的NiFe2O4纳米粒子。以多孔NiFe2O4为载体，采用等湿浸渍法制备了具有优良光电性能和催化活性的Ag/NiFe2O4催化剂。采用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、能量色散X射线光谱(EDX)、紫外-可见漫反射光谱(DRS)和傅立叶变换红外光谱(FT-IR)等技术对样品的结构进行了系统的研究。通过表面光伏(SPV)测量证实了样品中的光致电荷分离。在氙灯照射下，对比研究了Ag/NiFe2O4和NiFe2O4样品对甲苯的光催化降解。结果表明，773K焙烧的Ag/NiFe2O4样品对甲苯的降解效率最高。
Porous and “brick-like” NiFe2O4nanoparticles were synthesized by a modified chemical co-precipitation route with calcination temperatures of 773K, 873K and 973K, respectively. The Ag/NiFe2O4catalyst was prepared based on the porous NiFe2O4by the incipient wetness impregnation strategy, which showed excellent photoelectric property and catalytic activity. The structural properties of these samples were systematically investigated by X-ray powder diffraction (XRD), scanning electronic microscopy (SEM), energy-dispersive X-ray spectra (EDX), UV–vis diffuse reflectance spectroscopy (DRS), and Fourier transform infrared spectroscopy (FT-IR) techniques. The photo-induced charge separation in the samples was demonstrated by surface photovoltage (SPV) measurement. The photocatalytic degradation of toluene by the Ag/NiFe2O4and NiFe2O4samples was comparatively studied under xenon lamp irradiation. The results indicate that the Ag/NiFe2O4sample calcined at 773K exhibited the highest efficiency for the degradation of toluene.