针对鲁奇炉煤气化废水中酚类污染物难降解而无法满足生化处理的难题,采用热化学法制备钛铱钽催化电极(Ti/IrO2-Ta2O5),并将其作为阳极对鲁奇炉煤气化废水进行电催化降解。结果表明,当电流密度为50 m A/cm2、NaCl质量浓度为9.5 g/L、pH为...针对鲁奇炉煤气化废水中酚类污染物难降解而无法满足生化处理的难题,采用热化学法制备钛铱钽催化电极(Ti/IrO2-Ta2O5),并将其作为阳极对鲁奇炉煤气化废水进行电催化降解。结果表明,当电流密度为50 m A/cm2、NaCl质量浓度为9.5 g/L、pH为4、降解时间为180 min时,苯酚和COD的去除率较高,分别可达92%和48%。废水色度极大降低,BOD/COD提高至0.42,降解后的废水可满足生化处理要求。动力学研究表明,废水降解过程符合表观一级反应的动力学规律。展开更多
Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetic...Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetics.In this study,we prepared a Ni/Ti3O5@graphene oxide(GO)dual-heterojunction composite material via solvent heating,electrostatic adsorption,and calcination to improve the hydrogen storage capabilities of MgH2.Adding Ni/Ti3O5@GO to MgH2 lowered the initial dehydrogenation temperature of MgH2 to 183℃;at a dehydrogenation temperature of 275℃,6.4 wt.%of H2 escaped from the MgH2 bulk.In addition,the hydrogen storage material absorbed 1.8 wt.%H2 at 30℃ for 30 min.The calculated activation energy of dehydrogenation was 48.221±0.141 kJ·mol-1,which was significantly lower than that of the ball-milled MgH2(112.63±1.44 kJ·mol-1).Mechanistic analysis results revealed that the heterojunction constructed from the multiphase compound system provided a large number of active sites and hydrogen diffusion routes,resulting in a synergistic catalytic effect that enhanced the hydrogen storage capacity of MgH2.In this work,we clarified the compositions of fuzzy interfaces in heterostructured materials by conducting ultraviolet photoelectron spectroscopy tests and identified key composite materials for the formation of heterojunctions.展开更多
The preparation and electrocatalytic activity for oxygen evolution of the thermally prepared Ti anodes coated with IrO2-Ta2O5 were studied. The structure and morphologies of the oxide films with different contents of ...The preparation and electrocatalytic activity for oxygen evolution of the thermally prepared Ti anodes coated with IrO2-Ta2O5 were studied. The structure and morphologies of the oxide films with different contents of IrO2 were determined by XRD and SEM respectively. Their electrochemical properties were studied by Linear Sweep Voltammetry, Tafel Plot and Cyclic Voltammetry. The results show that iridium and tantalum can form solid solution and the mutual solubility is affected by the ratio of Ir to Ta in coating solution. With increasing IrO2 content in the coatings, the amount of fine crystallites of IrO2 is increased and the electrocatalytic capability of oxygen evolution is strengthened. The coating adhesion and rigidity decrease, which affects electrochemical activity of the anode when the content of IrO2 is too high. The electrochemically active surface area is determined not only by the content of IrO2but also the structure and morphology of the anode coatings. It is probably due to the existence of proper quantities of inert Ta2O5 which results in a typical morphology of cracks and solid solution structure.展开更多
摘要针对鲁奇炉煤气化废水中酚类污染物难降解而无法满足生化处理的难题,采用热化学法制备钛铱钽催化电极(Ti/IrO2-Ta2O5),并将其作为阳极对鲁奇炉煤气化废水进行电催化降解。结果表明,当电流密度为50 m A/cm2、NaCl质量浓度为9.5 g/L、pH为4、降解时间为180 min时,苯酚和COD的去除率较高,分别可达92%和48%。废水色度极大降低,BOD/COD提高至0.42,降解后的废水可满足生化处理要求。动力学研究表明,废水降解过程符合表观一级反应的动力学规律。
基金supported by the National Natural Science Foundation of China[grant number U24A2044]Science and Technology Major Program of Guangxi Province[grant number GUIKEAA24206007].
摘要Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetics.In this study,we prepared a Ni/Ti3O5@graphene oxide(GO)dual-heterojunction composite material via solvent heating,electrostatic adsorption,and calcination to improve the hydrogen storage capabilities of MgH2.Adding Ni/Ti3O5@GO to MgH2 lowered the initial dehydrogenation temperature of MgH2 to 183℃;at a dehydrogenation temperature of 275℃,6.4 wt.%of H2 escaped from the MgH2 bulk.In addition,the hydrogen storage material absorbed 1.8 wt.%H2 at 30℃ for 30 min.The calculated activation energy of dehydrogenation was 48.221±0.141 kJ·mol-1,which was significantly lower than that of the ball-milled MgH2(112.63±1.44 kJ·mol-1).Mechanistic analysis results revealed that the heterojunction constructed from the multiphase compound system provided a large number of active sites and hydrogen diffusion routes,resulting in a synergistic catalytic effect that enhanced the hydrogen storage capacity of MgH2.In this work,we clarified the compositions of fuzzy interfaces in heterostructured materials by conducting ultraviolet photoelectron spectroscopy tests and identified key composite materials for the formation of heterojunctions.
基金Project(50499330) supported by the National Natural Science Foundation of China
摘要The preparation and electrocatalytic activity for oxygen evolution of the thermally prepared Ti anodes coated with IrO2-Ta2O5 were studied. The structure and morphologies of the oxide films with different contents of IrO2 were determined by XRD and SEM respectively. Their electrochemical properties were studied by Linear Sweep Voltammetry, Tafel Plot and Cyclic Voltammetry. The results show that iridium and tantalum can form solid solution and the mutual solubility is affected by the ratio of Ir to Ta in coating solution. With increasing IrO2 content in the coatings, the amount of fine crystallites of IrO2 is increased and the electrocatalytic capability of oxygen evolution is strengthened. The coating adhesion and rigidity decrease, which affects electrochemical activity of the anode when the content of IrO2 is too high. The electrochemically active surface area is determined not only by the content of IrO2but also the structure and morphology of the anode coatings. It is probably due to the existence of proper quantities of inert Ta2O5 which results in a typical morphology of cracks and solid solution structure.