Silver nanoparticles （Ag-NPs） were prepared using an electrochemical technique. The optical properties were measured by absorption spectroscopy. The dimension of the prepared nanoparticles as estimated by the Atomic...Silver nanoparticles （Ag-NPs） were prepared using an electrochemical technique. The optical properties were measured by absorption spectroscopy. The dimension of the prepared nanoparticles as estimated by the Atomic Force Microscope （AFM）, was 91.57 nm. This reaserch effort proposes a mechanism for reducing the size of silver nanoparticles by adding the hydrogen peroxide （H202）, and protecting the silver nanoparticle to inhibit agglomeration by adding PVP polymer.展开更多
A novel combinatorial photoelectrochemical (CPE) technology with combination of ultraviolet (UV)- photolysis and direct current (DC) electrolysis is studied and discussed for drinking water purification. In the self-m...A novel combinatorial photoelectrochemical (CPE) technology with combination of ultraviolet (UV)- photolysis and direct current (DC) electrolysis is studied and discussed for drinking water purification. In the self-made compositive photo-electrolysis incorporate reactor, removal rate of the 2-chlorophenol as model environmental pollutants has been investigated experimentally in terms of applied voltage, pH value, flow velocity, temperature, and aeration conditions. A primary analysis of the combinatorial photo-electric synergic effect on the degradation of organic pollut-ants has been carried out. It is found that the best perform-ance of CPE oxidation is achieved by the following condi-tions: DC voltage of 5.0 V combined with UV-254-raidation, near neutral of pH 8 with aeration of pure oxygen. The in-fluences of circular velocity, temperature, and initial concen-tration of the pollutant are minor. Under the optimal condi-tions, removal ratio of 2-CP is higher than 50% in 30 min, and 100% removal ratio of 2-CP (5 10-6) can be reached and TOC removal ratio reached above 90% in 2.5 h. Com-plete mineralization is achieved eventually. It shows in our investigation that under the studied conditions the synergic effect of UV photolysis and DC electrolysis on the degrada-tion of the model pollutant is remarkable and validated, which may be derived from the coexistence of mutual com-plementary mechanisms of photoelectrochemical action, and the radicals chain reactions resulted from photo activation and electrolysis excitation in the process of CPE oxidation.展开更多
文摘Silver nanoparticles （Ag-NPs） were prepared using an electrochemical technique. The optical properties were measured by absorption spectroscopy. The dimension of the prepared nanoparticles as estimated by the Atomic Force Microscope （AFM）, was 91.57 nm. This reaserch effort proposes a mechanism for reducing the size of silver nanoparticles by adding the hydrogen peroxide （H202）, and protecting the silver nanoparticle to inhibit agglomeration by adding PVP polymer.
基金This work was supported by the Knowledge Innovation Project of the Chinese Academy of Sciences(Grant No.KZCX2-409)the Tenth Five-Year Key Tackle Plan of the Ministry of Science and Technology of China(Grant No.2001BA904B11).
文摘A novel combinatorial photoelectrochemical (CPE) technology with combination of ultraviolet (UV)- photolysis and direct current (DC) electrolysis is studied and discussed for drinking water purification. In the self-made compositive photo-electrolysis incorporate reactor, removal rate of the 2-chlorophenol as model environmental pollutants has been investigated experimentally in terms of applied voltage, pH value, flow velocity, temperature, and aeration conditions. A primary analysis of the combinatorial photo-electric synergic effect on the degradation of organic pollut-ants has been carried out. It is found that the best perform-ance of CPE oxidation is achieved by the following condi-tions: DC voltage of 5.0 V combined with UV-254-raidation, near neutral of pH 8 with aeration of pure oxygen. The in-fluences of circular velocity, temperature, and initial concen-tration of the pollutant are minor. Under the optimal condi-tions, removal ratio of 2-CP is higher than 50% in 30 min, and 100% removal ratio of 2-CP (5 10-6) can be reached and TOC removal ratio reached above 90% in 2.5 h. Com-plete mineralization is achieved eventually. It shows in our investigation that under the studied conditions the synergic effect of UV photolysis and DC electrolysis on the degrada-tion of the model pollutant is remarkable and validated, which may be derived from the coexistence of mutual com-plementary mechanisms of photoelectrochemical action, and the radicals chain reactions resulted from photo activation and electrolysis excitation in the process of CPE oxidation.
