The degradation capacity of advanced oxidants generated from oxygen reduction was investigated in model effluent containing chlorobenzene, aniline and benzene through the advanced oxidation processes(AOPs). Intermedia...The degradation capacity of advanced oxidants generated from oxygen reduction was investigated in model effluent containing chlorobenzene, aniline and benzene through the advanced oxidation processes(AOPs). Intermediate products of the degradation process were determined by GC–MS, and they contributed to specify the degradation pathways of monoaromatic compounds. The study particularly focused on the influence of the dosage of the oxidant, pH and the initial concentration of organic compounds on the degradation effectiveness.When the dosage of oxidant was 4 wt% and the pH was 7, the maximum degradation rates of 74.83% chlorobenzene, 70.32% aniline and 37.69% benzene were achieved. Furthermore, microwave was applied to intensify the oxidation process under optimal operation conditions, and the degradation rates were increased to 87.85% chlorobenzene, 89.11% aniline and 39.03% benzene, respectively.展开更多
This article,for the first time,provides a novel advanced oxidation process based on sulfate radical(SO4. -) to degrade organic pollutants in wastewater:microwave(MW)-activated persulfate oxidation(APO)with or without...This article,for the first time,provides a novel advanced oxidation process based on sulfate radical(SO4. -) to degrade organic pollutants in wastewater:microwave(MW)-activated persulfate oxidation(APO)with or without active carbon(AC).Azo dye acid Orange 7(AO7)is used as a model compound to investigate the high reactivity of MW-APO.It is found that AO7(up to 1000 mg/L)is completely decolorized within 5-7 min under an 800 W MW furnace assisted-APO.In the presence of chloride ion(up to 0.50 mol/L),the decolorization is still 100%completed,though delayed for about 1-2 min.Experiments are made to examine the enhancement by AC.It is exciting to find that the 100%decolorization of AO7(500 mg/L)is achieved within 3 min by MW-APO using 1.0 g/L AC as catalyst,while the degradation effciency maintains at 50%by MW energy without persulfate after about 5 min.Besides the destruction of visible light chromophore band of AO7(484 nm),during MW-APO,two bands in the ultraviolet region(228 nm and 310 nm)are rapidly broken down.The removal of COD is about 83%-95%for 500 mg/L AO7.SO4. -is identified with quenching studies using specific alcohols.Both SO4. -and.OH could degrade AO7,but SO 4 .-plays the dominant role.In a word,MW-APO AC is a new catalytic combustion technology for destruction of organic contamination even for high concentration.展开更多
A modified advanced oxidation process(AOP) utilizing a UV/electrochemically-generated peroxide system was used to fabricate titania films on chemically polished NiTi shape memory alloy(SMA). The microstructure and bio...A modified advanced oxidation process(AOP) utilizing a UV/electrochemically-generated peroxide system was used to fabricate titania films on chemically polished NiTi shape memory alloy(SMA). The microstructure and biomedical properties of the film were characterized by scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), inductively-coupled plasma mass spectrometry(ICPMS), hemolysis analysis, and blood platelet adhesion test. It is found that the modified AOP has a high processing effectiveness and can result in the formation of a dense titania film with a Ni-free zone near its top surface. In comparison, Ni can still be detected on the outer NiTi surface by the conventional AOP using the UV/H2O2 system. The depth profiles of O, Ni, Ti show that the film possesses a smooth graded interface structure next to the NiTi substrate and this structure enhances the mechanical stability of titania film. The titania film can dramatically reduce toxic Ni ion release and also improve the hemolysis resistance and thromboresistance of biomedical NiTi SMA.展开更多
Nano-TiO_2 photocatalytic oxidation was used to perform the advanced treatment of biologically treated chemical comprehensive wastewater. The effects of reaction time,nano-TiO_2 dosage and initial p H of the wastewate...Nano-TiO_2 photocatalytic oxidation was used to perform the advanced treatment of biologically treated chemical comprehensive wastewater. The effects of reaction time,nano-TiO_2 dosage and initial p H of the wastewater on the removal rate of COD were tested. The GC/MS and EEM techniques were used to qualitatively analyze organic compounds in the wastewater before and after treatment. The result showed that after the biologically treated chemical comprehensive wastewater was treated by nano-TiO_2 photocatalytic oxidation under the conditions of reaction time 3 h,nano-TiO_2 dosage 8 g/L,and pH 8. 0,the effluent COD was 61. 9 mg/L and its removal rate was 63. 8%. Additionally,the species of organic pollutants reduced from 12 to 6. Meanwhile,the content of humic-like and fulvic-like substances dropped dramatically.展开更多
基金Supported by the Key Technologies R&D Program of China(2011BAE111300)
文摘The degradation capacity of advanced oxidants generated from oxygen reduction was investigated in model effluent containing chlorobenzene, aniline and benzene through the advanced oxidation processes(AOPs). Intermediate products of the degradation process were determined by GC–MS, and they contributed to specify the degradation pathways of monoaromatic compounds. The study particularly focused on the influence of the dosage of the oxidant, pH and the initial concentration of organic compounds on the degradation effectiveness.When the dosage of oxidant was 4 wt% and the pH was 7, the maximum degradation rates of 74.83% chlorobenzene, 70.32% aniline and 37.69% benzene were achieved. Furthermore, microwave was applied to intensify the oxidation process under optimal operation conditions, and the degradation rates were increased to 87.85% chlorobenzene, 89.11% aniline and 39.03% benzene, respectively.
文摘This article,for the first time,provides a novel advanced oxidation process based on sulfate radical(SO4. -) to degrade organic pollutants in wastewater:microwave(MW)-activated persulfate oxidation(APO)with or without active carbon(AC).Azo dye acid Orange 7(AO7)is used as a model compound to investigate the high reactivity of MW-APO.It is found that AO7(up to 1000 mg/L)is completely decolorized within 5-7 min under an 800 W MW furnace assisted-APO.In the presence of chloride ion(up to 0.50 mol/L),the decolorization is still 100%completed,though delayed for about 1-2 min.Experiments are made to examine the enhancement by AC.It is exciting to find that the 100%decolorization of AO7(500 mg/L)is achieved within 3 min by MW-APO using 1.0 g/L AC as catalyst,while the degradation effciency maintains at 50%by MW energy without persulfate after about 5 min.Besides the destruction of visible light chromophore band of AO7(484 nm),during MW-APO,two bands in the ultraviolet region(228 nm and 310 nm)are rapidly broken down.The removal of COD is about 83%-95%for 500 mg/L AO7.SO4. -is identified with quenching studies using specific alcohols.Both SO4. -and.OH could degrade AO7,but SO 4 .-plays the dominant role.In a word,MW-APO AC is a new catalytic combustion technology for destruction of organic contamination even for high concentration.
基金Project(NCET-06-0464) supported by the Program for New Century Excellent Talents in University of Ministry of Education of ChinaProject(BK2007515) supported by the Natural Science Foundation of Jiangsu Province, China+2 种基金Project(2006AA03Z445) supported by the National High-tech Research and Development Program of ChinaProject supported by Nippon Sheet Glass Foundation for Materials Science and Engineering (NSG Foundation)Project(7001999) supported by SRG Grant from the Research Committee of the CityU of HK
文摘A modified advanced oxidation process(AOP) utilizing a UV/electrochemically-generated peroxide system was used to fabricate titania films on chemically polished NiTi shape memory alloy(SMA). The microstructure and biomedical properties of the film were characterized by scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), inductively-coupled plasma mass spectrometry(ICPMS), hemolysis analysis, and blood platelet adhesion test. It is found that the modified AOP has a high processing effectiveness and can result in the formation of a dense titania film with a Ni-free zone near its top surface. In comparison, Ni can still be detected on the outer NiTi surface by the conventional AOP using the UV/H2O2 system. The depth profiles of O, Ni, Ti show that the film possesses a smooth graded interface structure next to the NiTi substrate and this structure enhances the mechanical stability of titania film. The titania film can dramatically reduce toxic Ni ion release and also improve the hemolysis resistance and thromboresistance of biomedical NiTi SMA.
文摘Nano-TiO_2 photocatalytic oxidation was used to perform the advanced treatment of biologically treated chemical comprehensive wastewater. The effects of reaction time,nano-TiO_2 dosage and initial p H of the wastewater on the removal rate of COD were tested. The GC/MS and EEM techniques were used to qualitatively analyze organic compounds in the wastewater before and after treatment. The result showed that after the biologically treated chemical comprehensive wastewater was treated by nano-TiO_2 photocatalytic oxidation under the conditions of reaction time 3 h,nano-TiO_2 dosage 8 g/L,and pH 8. 0,the effluent COD was 61. 9 mg/L and its removal rate was 63. 8%. Additionally,the species of organic pollutants reduced from 12 to 6. Meanwhile,the content of humic-like and fulvic-like substances dropped dramatically.
