Fe_(3)O_(4)-CoO/Al_(2)O_(3)catalyst was prepared by incipient wetness impregnation using Fe(NO3)3.9H2O and Co(NO3)2.6H2O as the precursors,and its catalytic performance was investigated in ozonation of 2-(2,4-dichloro...Fe_(3)O_(4)-CoO/Al_(2)O_(3)catalyst was prepared by incipient wetness impregnation using Fe(NO3)3.9H2O and Co(NO3)2.6H2O as the precursors,and its catalytic performance was investigated in ozonation of 2-(2,4-dichlorophenoxy)propionic acid(2,4-DP),nitrobenzene and oxalic acid.The experimental results indicated that Fe_(3)O_(4)-CoO/Al_(2)O_(3)catalyst enabled an interesting improvement of ozonation efficiency during the degradation of each organic pollutant,and the Fe_(3)O_(4)-CoO/Al_(2)O_(3)catalytic ozonation system followed a radical-type mechanism.The kinetics of ozonation alone and Fe_(3)O_(4)-CoO/Al_(2)O_(3)catalytic ozonation of three organic pollutants in aqueous solution were discussed under the mere consideration of direct ozone reaction and OH radical reaction to well investigate its performance.In the catalytic ozonation of 2,4-DP,the apparent reaction rate constants(k)were determined to be 1.456×10^-2 min-1 for ozonation alone and 4.740×10^-2 min^-1 for O3/Fe_(3)O_(4)-CoO/Al_(2)O_(3).And O3/Fe_(3)O_(4)-CoO/Al_(2)O_(3)had a larger Rot(6.614×10^-9)calculated by the relative method than O3 did(1.800 x 10-9),showing O3/Fe_(3)O_(4)-CoO/Al_(2)O_(3)generated more hydroxyl radical.Similar results were also obtained in the catalytic ozonation of nitrobenzene and oxalic acid.The above results demonstrated that the catalytic performance of Fe_(3)O_(4)-CoO/Al_(2)O_(3)in ozonation of studied organic substance was universal to a certain degree.展开更多
The integration of the photocatalytic effect into solar steam is highly desirable for addressing freshwater shortages and water pollution.Here,a ternary film structure for the adsorption and photothermal and photocata...The integration of the photocatalytic effect into solar steam is highly desirable for addressing freshwater shortages and water pollution.Here,a ternary film structure for the adsorption and photothermal and photocatalytic treatment of wastewater was designed by combining the technique of self-assembled carbon nano paper with a nitrogen composite titanium dioxide(N-TiO_(2))deposited on the surface of carbon nanotubes(CNT)using polyvinylidene fluoride(PVDF)as a substrate.The photogeneration of reactive oxygen species can be promoted by rapid oxygen diffusion at the three-phase interface,whereas the interfacial photothermal effect promotes subsequent free radical reactions for the degradation of rhodamine B(93%).The freshwater evaporation rate is 1.35 kg·m^(-2)·h^(-1)and the solar-to-water evaporation efficiency is 94%.Importantly,the N-TiO_(2)/CNT/PVDF(N-TCP)film not only effectively resists mechanical damage from the environment and maintains structural integrity,but can also be made into a large film for outdoor experiments in a large solar energy conversion device to collect fresh water from polluted water and degrade organic dyes in source water simultaneously,opening the way for applications in energy conversion and storage.展开更多
基金supported by the National Natural Science Foundation of China(No.50578146,20876151)the National Science Foundation of Zhejiang Province,China(No.Y5080178)
文摘Fe_(3)O_(4)-CoO/Al_(2)O_(3)catalyst was prepared by incipient wetness impregnation using Fe(NO3)3.9H2O and Co(NO3)2.6H2O as the precursors,and its catalytic performance was investigated in ozonation of 2-(2,4-dichlorophenoxy)propionic acid(2,4-DP),nitrobenzene and oxalic acid.The experimental results indicated that Fe_(3)O_(4)-CoO/Al_(2)O_(3)catalyst enabled an interesting improvement of ozonation efficiency during the degradation of each organic pollutant,and the Fe_(3)O_(4)-CoO/Al_(2)O_(3)catalytic ozonation system followed a radical-type mechanism.The kinetics of ozonation alone and Fe_(3)O_(4)-CoO/Al_(2)O_(3)catalytic ozonation of three organic pollutants in aqueous solution were discussed under the mere consideration of direct ozone reaction and OH radical reaction to well investigate its performance.In the catalytic ozonation of 2,4-DP,the apparent reaction rate constants(k)were determined to be 1.456×10^-2 min-1 for ozonation alone and 4.740×10^-2 min^-1 for O3/Fe_(3)O_(4)-CoO/Al_(2)O_(3).And O3/Fe_(3)O_(4)-CoO/Al_(2)O_(3)had a larger Rot(6.614×10^-9)calculated by the relative method than O3 did(1.800 x 10-9),showing O3/Fe_(3)O_(4)-CoO/Al_(2)O_(3)generated more hydroxyl radical.Similar results were also obtained in the catalytic ozonation of nitrobenzene and oxalic acid.The above results demonstrated that the catalytic performance of Fe_(3)O_(4)-CoO/Al_(2)O_(3)in ozonation of studied organic substance was universal to a certain degree.
基金Scientific Research Fund of Zhejiang Provincial Education Department(Y202250501)SRT Research Project of Jiaxing Nanhu University。
文摘The integration of the photocatalytic effect into solar steam is highly desirable for addressing freshwater shortages and water pollution.Here,a ternary film structure for the adsorption and photothermal and photocatalytic treatment of wastewater was designed by combining the technique of self-assembled carbon nano paper with a nitrogen composite titanium dioxide(N-TiO_(2))deposited on the surface of carbon nanotubes(CNT)using polyvinylidene fluoride(PVDF)as a substrate.The photogeneration of reactive oxygen species can be promoted by rapid oxygen diffusion at the three-phase interface,whereas the interfacial photothermal effect promotes subsequent free radical reactions for the degradation of rhodamine B(93%).The freshwater evaporation rate is 1.35 kg·m^(-2)·h^(-1)and the solar-to-water evaporation efficiency is 94%.Importantly,the N-TiO_(2)/CNT/PVDF(N-TCP)film not only effectively resists mechanical damage from the environment and maintains structural integrity,but can also be made into a large film for outdoor experiments in a large solar energy conversion device to collect fresh water from polluted water and degrade organic dyes in source water simultaneously,opening the way for applications in energy conversion and storage.
