FeVO4/CeO2 was applied in the electro-Fenton(EF)degradation of Methyl Orange(MO)as a model of wastewater pollution.The results of the characterization techniques indicate that FeVO4 with triclinic structure and face-c...FeVO4/CeO2 was applied in the electro-Fenton(EF)degradation of Methyl Orange(MO)as a model of wastewater pollution.The results of the characterization techniques indicate that FeVO4 with triclinic structure and face-centered cubic fluorite CeO2 maintained their structures during the nanocomposite synthesis.The effect of applied current intensity,initial pollutant concentration,initial pH,and catalyst weight was investigated.The MO removal reached 96.31%and chemical oxygen demand(COD)removal 70%for 60 min of the reaction.The presence of CeO2 in the nanocomposite plays a key role in H2O2 electro-generation as a significant factor in the electro-Fenton(EF)system.The metal leaching from FeVO4/CeO2 was negligible(cerium 4.1%,iron 4.3%,and vanadium 1.7%),which indicates that the active species in the nanocomposite are strongly interacting with each other and are stable.The performance of the nanocatalyst in real wastewaters,salty,and binary systems was acceptable and the pollutions were removed efficiently.The synergistic effect between V,Fe,and Ce could be account as the reason for the respectable function of FeVO4/CeO2.The electron transfer proceeds via Haber-Weiss mechanism.A degradation pathway was proposed through by-products analysis using gas chromatography-mass spectrometry(GC–MS)technique.The pseudo-first-order kinetic model described the obtained experimental results(R2=0.9906).The electro-Fenton system efficiency was improved by adding persulfate.The nanocomposite preserved almost its efficiency after six cycles.The obtained results demonstrate that the synergistic catalyst(FeVO4/CeO2)has the capability to introduce as a promising replacement of conventional catalysts in the electro-Fenton processes with brilliant proficiency.展开更多
采用一步水热法制备了FeVO_4/BiVO_4光-Fenton复合催化剂,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和紫外可见漫反射(UV-Vis)对样品进行了表征,并以氙灯为照射光源,亚甲基蓝为目标污染物,对该催化剂的催化活...采用一步水热法制备了FeVO_4/BiVO_4光-Fenton复合催化剂,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和紫外可见漫反射(UV-Vis)对样品进行了表征,并以氙灯为照射光源,亚甲基蓝为目标污染物,对该催化剂的催化活性进行了评价.结果表明,与纯FeVO_4和纯BiVO_4比较,FeVO_4/BiVO_4光吸收峰明显向可见光区扩展,光催化活性显著提高.同时作为类Fenton固相催化剂也显现出较高的催化活性,在氙灯照射和H2O2下,亚甲基蓝在p H 3—9范围内均可降解,在p H 3.0时,反应40 min降解率达到90%以上.展开更多
采用浸渍法将钒酸铁通过硅烷偶联剂以共价键形式负载到棉织物上,制备得到Fe VO4负载型棉织物。通过傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)和扫描电子显微镜(SEM)对产物进行表征。负载型催化剂的催化活性以其在可见光下对盐酸四环素...采用浸渍法将钒酸铁通过硅烷偶联剂以共价键形式负载到棉织物上,制备得到Fe VO4负载型棉织物。通过傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)和扫描电子显微镜(SEM)对产物进行表征。负载型催化剂的催化活性以其在可见光下对盐酸四环素的催化降解效果进行评价,并讨论了负载工艺对其催化活性的影响。结果表明,在可见光下,于最佳工艺(浴比1∶120,体系中乙醇与水体积比为1∶9,使用0.15 g Fe VO4,0.5%硅烷偶联剂,80℃负载9 h)制备得到的Fe VO4负载型棉织物,对盐酸四环素反应120 min后的降解率为97.63%。展开更多
基金the Sharif University of Technol-ogy,the chemistry department,for financial support。
文摘FeVO4/CeO2 was applied in the electro-Fenton(EF)degradation of Methyl Orange(MO)as a model of wastewater pollution.The results of the characterization techniques indicate that FeVO4 with triclinic structure and face-centered cubic fluorite CeO2 maintained their structures during the nanocomposite synthesis.The effect of applied current intensity,initial pollutant concentration,initial pH,and catalyst weight was investigated.The MO removal reached 96.31%and chemical oxygen demand(COD)removal 70%for 60 min of the reaction.The presence of CeO2 in the nanocomposite plays a key role in H2O2 electro-generation as a significant factor in the electro-Fenton(EF)system.The metal leaching from FeVO4/CeO2 was negligible(cerium 4.1%,iron 4.3%,and vanadium 1.7%),which indicates that the active species in the nanocomposite are strongly interacting with each other and are stable.The performance of the nanocatalyst in real wastewaters,salty,and binary systems was acceptable and the pollutions were removed efficiently.The synergistic effect between V,Fe,and Ce could be account as the reason for the respectable function of FeVO4/CeO2.The electron transfer proceeds via Haber-Weiss mechanism.A degradation pathway was proposed through by-products analysis using gas chromatography-mass spectrometry(GC–MS)technique.The pseudo-first-order kinetic model described the obtained experimental results(R2=0.9906).The electro-Fenton system efficiency was improved by adding persulfate.The nanocomposite preserved almost its efficiency after six cycles.The obtained results demonstrate that the synergistic catalyst(FeVO4/CeO2)has the capability to introduce as a promising replacement of conventional catalysts in the electro-Fenton processes with brilliant proficiency.
文摘采用一步水热法制备了FeVO_4/BiVO_4光-Fenton复合催化剂,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和紫外可见漫反射(UV-Vis)对样品进行了表征,并以氙灯为照射光源,亚甲基蓝为目标污染物,对该催化剂的催化活性进行了评价.结果表明,与纯FeVO_4和纯BiVO_4比较,FeVO_4/BiVO_4光吸收峰明显向可见光区扩展,光催化活性显著提高.同时作为类Fenton固相催化剂也显现出较高的催化活性,在氙灯照射和H2O2下,亚甲基蓝在p H 3—9范围内均可降解,在p H 3.0时,反应40 min降解率达到90%以上.
文摘采用浸渍法将钒酸铁通过硅烷偶联剂以共价键形式负载到棉织物上,制备得到Fe VO4负载型棉织物。通过傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)和扫描电子显微镜(SEM)对产物进行表征。负载型催化剂的催化活性以其在可见光下对盐酸四环素的催化降解效果进行评价,并讨论了负载工艺对其催化活性的影响。结果表明,在可见光下,于最佳工艺(浴比1∶120,体系中乙醇与水体积比为1∶9,使用0.15 g Fe VO4,0.5%硅烷偶联剂,80℃负载9 h)制备得到的Fe VO4负载型棉织物,对盐酸四环素反应120 min后的降解率为97.63%。
基金financially supported by the National Natural Science Foundation of China(21471069,21476098,and 21576123)Jiangsu University Scientific Research Funding(11JDG0146)~~
