以自来水为试验对象 ,对紫外—臭氧和紫外—二氧化钛两种光化学氧化技术对水中微量有机污染物的去除进行了试验研究 ,结果表明两种工艺的 U V A (紫外吸光度 )去除率均达到 80 %以上 ,对氯仿的去除也均能达到国家饮用水标准。在此基础...以自来水为试验对象 ,对紫外—臭氧和紫外—二氧化钛两种光化学氧化技术对水中微量有机污染物的去除进行了试验研究 ,结果表明两种工艺的 U V A (紫外吸光度 )去除率均达到 80 %以上 ,对氯仿的去除也均能达到国家饮用水标准。在此基础上 ,自制了一种催化剂膜 ,并取得了预期的处理效果 。展开更多
Photochemical oxidation of thiophene in n-octane/water extraction system by using air as oxidant was studied.Results obtained here can be used as the reference of oxidative desulfurization of gasoline because thiophen...Photochemical oxidation of thiophene in n-octane/water extraction system by using air as oxidant was studied.Results obtained here can be used as the reference of oxidative desulfurization of gasoline because thiophene is one of the main sulfur-containing components in fluid catalytic cracking gasoline.A 500 W high pressure Hg lamp （wave length 365 nm, 0.19 kW·m -2 ） was used as the light source for irradiation and air was introduced by a gas pump for supplying O2.Thiophene dissolved in n-octane was photodecomposed and removed into the water phase at ambient temperature and atmospheric pressure.Thiophene can be photo-oxidized directly to sulfone,sulfoxide, or ethanedioic acid,SO<sup> 2- <sub> 4 ,CO2.The photo-oxidation kinetics of thiophene with O2 was first-order with rate constant of 4.42×10 -5 s -1 and half-time of 4.36 h.The desulfurization yield of thiophene in n-octane was 58.9% for a 5 h photo-irradiation under the conditions with air flow at 150 ml·min -1 and water/oil ratio at 1∶1.The sulfur content could be reduced from 800 μl·L -1 to less than 330 μl·L -1 .展开更多
The photochemical degradation of p nitrophenol and 2,4 dinitrophenol in both natural seawater and artificial seawater was studied under the irradiation of mixed light sources(ultraviolet lamp/high pressure mercury lam...The photochemical degradation of p nitrophenol and 2,4 dinitrophenol in both natural seawater and artificial seawater was studied under the irradiation of mixed light sources(ultraviolet lamp/high pressure mercury lamp). The photolysis of the two nitrophenols was influenced by various factors including medium, heavy metal ions and photosensitizer. The photolysis of the two nitrophenols in natural seawater was faster than in artificial seawater, presumably due to the effect of inherent photosensitizers in natural seawater. The addition of Cu 2+ , Pb 2+ or Cd 2+ into the seawater solutions obviously increased the photolysis rate of the nitrophenols. Interestingly, we found that the presence of anthroquinone could accelerate the photolysis of p nitrophenol in natural seawater but had almost no impact on the photolysis of 2,4 dinitrophenol. The half lives of the photoreactions in natural seawater under our conditions were 40-54 min for p nitrophenol and 37-69 min for 2,4 dinitrophenol, respectively. Our study suggests that photochemical degradation is an important removal pathway for the nitrophenols in seawater.展开更多
文摘Photochemical oxidation of thiophene in n-octane/water extraction system by using air as oxidant was studied.Results obtained here can be used as the reference of oxidative desulfurization of gasoline because thiophene is one of the main sulfur-containing components in fluid catalytic cracking gasoline.A 500 W high pressure Hg lamp （wave length 365 nm, 0.19 kW·m -2 ） was used as the light source for irradiation and air was introduced by a gas pump for supplying O2.Thiophene dissolved in n-octane was photodecomposed and removed into the water phase at ambient temperature and atmospheric pressure.Thiophene can be photo-oxidized directly to sulfone,sulfoxide, or ethanedioic acid,SO<sup> 2- <sub> 4 ,CO2.The photo-oxidation kinetics of thiophene with O2 was first-order with rate constant of 4.42×10 -5 s -1 and half-time of 4.36 h.The desulfurization yield of thiophene in n-octane was 58.9% for a 5 h photo-irradiation under the conditions with air flow at 150 ml·min -1 and water/oil ratio at 1∶1.The sulfur content could be reduced from 800 μl·L -1 to less than 330 μl·L -1 .
文摘The photochemical degradation of p nitrophenol and 2,4 dinitrophenol in both natural seawater and artificial seawater was studied under the irradiation of mixed light sources(ultraviolet lamp/high pressure mercury lamp). The photolysis of the two nitrophenols was influenced by various factors including medium, heavy metal ions and photosensitizer. The photolysis of the two nitrophenols in natural seawater was faster than in artificial seawater, presumably due to the effect of inherent photosensitizers in natural seawater. The addition of Cu 2+ , Pb 2+ or Cd 2+ into the seawater solutions obviously increased the photolysis rate of the nitrophenols. Interestingly, we found that the presence of anthroquinone could accelerate the photolysis of p nitrophenol in natural seawater but had almost no impact on the photolysis of 2,4 dinitrophenol. The half lives of the photoreactions in natural seawater under our conditions were 40-54 min for p nitrophenol and 37-69 min for 2,4 dinitrophenol, respectively. Our study suggests that photochemical degradation is an important removal pathway for the nitrophenols in seawater.
