Ag-modified TiO2 nanoflowers were prepared using a two-step process. The experimental process is green and free from contamination and can be synthesized directly at room temperature. Compared with pure TiO2, Ag-modif...Ag-modified TiO2 nanoflowers were prepared using a two-step process. The experimental process is green and free from contamination and can be synthesized directly at room temperature. Compared with pure TiO2, Ag-modified TiO2 enhances the absorption of visible light and effectively promotes the detachment of photoelectron pairs, Ag-TiO2 has a significantly enhanced visible light response activity to photodecomposition of methyl orange(MO). It is shown that the strong interaction between Ag nanoparticles and TiO2 enhances the photocatalytic activity of TiO2 nanoflowers. The self-made open-air reactor was used to test the photocatalytic performance of different samples. The results showed that Ag-modified TiO2 nanoflowers had excellent photodegradation ability. After repeated photodegradation of MO, Ag-modified TiO2 nanoflowers showed good stability.展开更多
Through the Fenton pre-oxidation followed by microbial degradation,this study gave full play to its advantages while avoiding its shortcomings for the remediation of crude oil contaminated soil.The Fenton reagent coup...Through the Fenton pre-oxidation followed by microbial degradation,this study gave full play to its advantages while avoiding its shortcomings for the remediation of crude oil contaminated soil.The Fenton reagent coupled with different volumes of H2O2 was applied to the oil contaminated soil and then the microbial agents were introduced to biodegrade the residual oil for 15 days.The correlation between the characteristics of residual oil in soil,the changes in soil physical-chemical property after the Fenton pre-oxidation,and the biodegradation were analyzed in this paper.The results show that the above factors are strongly correlated with the subsequent biodegradation rate,and the order of correlation is as follows:the ratio of TOC to NH4+-N(R^2=0.9513)>the ratio of light oil components to the heavy oil components(R^2=0.9095)>the proportion of hydrocarbons with carbon chain number of less than C23(R^2=0.8259)>the crude oil content(R^2=0.7603)>the soil pH(R^2=0.7492)>the number of microorganisms(R^2=0.6506).During the biodegradation and pre-oxidation reactions of heavy oil components,an appropriate C:N ratio turns out to be the most critical factor in this study.展开更多
Octahedral CoO with nanostructures decorated with Ag nanoparticles was prepared via a facile solvothermal approach. After being annealed at 500 ℃ for 1 h, an electrochemical capacitor material of Co3O4 decorated with...Octahedral CoO with nanostructures decorated with Ag nanoparticles was prepared via a facile solvothermal approach. After being annealed at 500 ℃ for 1 h, an electrochemical capacitor material of Co3O4 decorated with Ag2O was obtained. The cyclic voltammetry and galvanostatic charge-discharge were used to evaluate the electrochemical properties of the as-prepared products. The results indicated that the as-prepared samples exhibited fine pseudo-capacitive performance, and the surface modifications of Ag2O can significantly increase the capacitance of the Co3O4 material. The specific capacitance of Ag2O/Co3O4 composite electrode was up to 217.6 F·g^-1, which was 3.35 times as high as that of pure Co3O4. Moreover, Ag2O/Co3O4 composite showed an excellent cycle performance, and 65.3% of specific capacitance was maintained after 200 cycles.展开更多
基金Fund by the National Natural Science Foundation of China(51502005,51602005,and 51702003)the Key Foundation for Young Talents in College of Anhui Province(gxyq ZD2016081)the Quality Engineering Project in Colleges and Universities of Anhui Province(2017sxzx15 and 2018zygc012)
文摘Ag-modified TiO2 nanoflowers were prepared using a two-step process. The experimental process is green and free from contamination and can be synthesized directly at room temperature. Compared with pure TiO2, Ag-modified TiO2 enhances the absorption of visible light and effectively promotes the detachment of photoelectron pairs, Ag-TiO2 has a significantly enhanced visible light response activity to photodecomposition of methyl orange(MO). It is shown that the strong interaction between Ag nanoparticles and TiO2 enhances the photocatalytic activity of TiO2 nanoflowers. The self-made open-air reactor was used to test the photocatalytic performance of different samples. The results showed that Ag-modified TiO2 nanoflowers had excellent photodegradation ability. After repeated photodegradation of MO, Ag-modified TiO2 nanoflowers showed good stability.
基金supported by the Basic Research Project of the Institute of Hydrogeology and Environmental Geology of the Chinese Academy of Geological Sciences (SK201502)
文摘Through the Fenton pre-oxidation followed by microbial degradation,this study gave full play to its advantages while avoiding its shortcomings for the remediation of crude oil contaminated soil.The Fenton reagent coupled with different volumes of H2O2 was applied to the oil contaminated soil and then the microbial agents were introduced to biodegrade the residual oil for 15 days.The correlation between the characteristics of residual oil in soil,the changes in soil physical-chemical property after the Fenton pre-oxidation,and the biodegradation were analyzed in this paper.The results show that the above factors are strongly correlated with the subsequent biodegradation rate,and the order of correlation is as follows:the ratio of TOC to NH4+-N(R^2=0.9513)>the ratio of light oil components to the heavy oil components(R^2=0.9095)>the proportion of hydrocarbons with carbon chain number of less than C23(R^2=0.8259)>the crude oil content(R^2=0.7603)>the soil pH(R^2=0.7492)>the number of microorganisms(R^2=0.6506).During the biodegradation and pre-oxidation reactions of heavy oil components,an appropriate C:N ratio turns out to be the most critical factor in this study.
基金Funded by National Natural Science Foundation of China(Nos.51502005,51602005,11647001 and 11404005)Key Foundation for Young Talents in College of Anhui Province(Nos.gxyq ZD2016081,2013SQRL026ZD)Open Foundation for Cooperative Innovation Research Center for Weak Signal-Detecting Materials and Devices Integration(No.01001795-201403)
文摘Octahedral CoO with nanostructures decorated with Ag nanoparticles was prepared via a facile solvothermal approach. After being annealed at 500 ℃ for 1 h, an electrochemical capacitor material of Co3O4 decorated with Ag2O was obtained. The cyclic voltammetry and galvanostatic charge-discharge were used to evaluate the electrochemical properties of the as-prepared products. The results indicated that the as-prepared samples exhibited fine pseudo-capacitive performance, and the surface modifications of Ag2O can significantly increase the capacitance of the Co3O4 material. The specific capacitance of Ag2O/Co3O4 composite electrode was up to 217.6 F·g^-1, which was 3.35 times as high as that of pure Co3O4. Moreover, Ag2O/Co3O4 composite showed an excellent cycle performance, and 65.3% of specific capacitance was maintained after 200 cycles.
