Quinoline is widely used in the production of drugs as a highly effective insecticide,and its derivatives can also be used to produce dyes.It has a teratogenic carcinogen to wildlife and humans once entering into the ...Quinoline is widely used in the production of drugs as a highly effective insecticide,and its derivatives can also be used to produce dyes.It has a teratogenic carcinogen to wildlife and humans once entering into the aquatic environment.In this study,the degradation mechanism of quinoline in drinking water by a strong ionization dielectric barrier discharge(DBD)lowtemperature plasma with large volume was explored.High concentration of hydroxyl radical(·OH)(0.74 mmol l^(-1))and ozone(O3)(58.2 mg l^(-1))produced by strongly ionized discharge DBD system were quantitatively analyzed based on the results of electron spin resonance and O3 measurements.The influencing reaction conditions of input voltages,initial pH value,·OH inhibitors,initial concentration and inorganic ions on the removal efficiency of quinoline were systematically studied.The obtained results showed that the removal efficiency and TOC removal of quinoline achieved 94.8%and 32.2%,degradation kinetic constant was 0.050 min^(-1) at 3.8 k V and in a neutral pH(7.2).The proposed pathways of quinoline were suggested based on identified intermediates as hydroxy pyridine,fumaric acid,oxalic acid,and other small molecular acids by high-performance liquid chromatography/tandem mass spectrometry analysis.Moreover,the toxicity analysis on the intermediates demonstrated that its acute toxicity,bioaccumulation factor and mutagenicity were reduced.The overall findings provided theoretical and experimental basis for the application of a high capacity strong ionization DBD water treatment system in the removal of quinoline from drinking water.展开更多
The effect of hydroxyl radical(·OH) on microalgae in ballast water is experimentally investigated. An ?OH plasma generator, which has a thin plate discharge Ag electrode covered by two α-Al2 O3 dielectric layers...The effect of hydroxyl radical(·OH) on microalgae in ballast water is experimentally investigated. An ?OH plasma generator, which has a thin plate discharge Ag electrode covered by two α-Al2 O3 dielectric layers, is built. The plasma generator is filled with O2 and gaseous H2 O and is powered by a homemade power supply. ?OH radicals are generated by a series of plasma reactions and then dissolved into ballast water to kill microalgae. The maximum density of the killed microalgae is about 11 000 cells per milliliter. At this density, the microalgae are not reactivated at the 48th hour and the 120th hour in the treated ballast waters, and the content of chlorophyll in these microalgae decreases by 100%. The water quality returns to a normal level after 120 hours without secondary pollution of aquatic organisms and environment. These results show that the requirements of the D-2 ballast water discharge standard defined by the International Maritime Organization(IMO) are satisfied with the proposed treatment, and that ·OH is an ideal substance for killing microalgae during ballast water replacement of ships.展开更多
基金National Natural Science Foundation of China(No.32071521)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX18_2272)+1 种基金the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment for their support of this work。
文摘Quinoline is widely used in the production of drugs as a highly effective insecticide,and its derivatives can also be used to produce dyes.It has a teratogenic carcinogen to wildlife and humans once entering into the aquatic environment.In this study,the degradation mechanism of quinoline in drinking water by a strong ionization dielectric barrier discharge(DBD)lowtemperature plasma with large volume was explored.High concentration of hydroxyl radical(·OH)(0.74 mmol l^(-1))and ozone(O3)(58.2 mg l^(-1))produced by strongly ionized discharge DBD system were quantitatively analyzed based on the results of electron spin resonance and O3 measurements.The influencing reaction conditions of input voltages,initial pH value,·OH inhibitors,initial concentration and inorganic ions on the removal efficiency of quinoline were systematically studied.The obtained results showed that the removal efficiency and TOC removal of quinoline achieved 94.8%and 32.2%,degradation kinetic constant was 0.050 min^(-1) at 3.8 k V and in a neutral pH(7.2).The proposed pathways of quinoline were suggested based on identified intermediates as hydroxy pyridine,fumaric acid,oxalic acid,and other small molecular acids by high-performance liquid chromatography/tandem mass spectrometry analysis.Moreover,the toxicity analysis on the intermediates demonstrated that its acute toxicity,bioaccumulation factor and mutagenicity were reduced.The overall findings provided theoretical and experimental basis for the application of a high capacity strong ionization DBD water treatment system in the removal of quinoline from drinking water.
基金Project supported by National Natural Science Foundation of China(NSFC)for Distinguished Young Scholar(61025001)National Technology Support Project of China(2013BAC06B00)+1 种基金Special Fund for Marine Scientific Research in the Public Interest(201305027-5)Fundamental Research Fund for the Central Universities(3132013316)
文摘The effect of hydroxyl radical(·OH) on microalgae in ballast water is experimentally investigated. An ?OH plasma generator, which has a thin plate discharge Ag electrode covered by two α-Al2 O3 dielectric layers, is built. The plasma generator is filled with O2 and gaseous H2 O and is powered by a homemade power supply. ?OH radicals are generated by a series of plasma reactions and then dissolved into ballast water to kill microalgae. The maximum density of the killed microalgae is about 11 000 cells per milliliter. At this density, the microalgae are not reactivated at the 48th hour and the 120th hour in the treated ballast waters, and the content of chlorophyll in these microalgae decreases by 100%. The water quality returns to a normal level after 120 hours without secondary pollution of aquatic organisms and environment. These results show that the requirements of the D-2 ballast water discharge standard defined by the International Maritime Organization(IMO) are satisfied with the proposed treatment, and that ·OH is an ideal substance for killing microalgae during ballast water replacement of ships.
