Non-thermal plasma(NTP)is regarded as a potential application for environmental pollution control due to its ability to remove pollutants.As a major precursor of dioxins,the influence of the parameters of 1,2,4-trichl...Non-thermal plasma(NTP)is regarded as a potential application for environmental pollution control due to its ability to remove pollutants.As a major precursor of dioxins,the influence of the parameters of 1,2,4-trichlorobenzene(TCB)decomposition using NTP technology was investigated through a series of experiments,including voltage,frequency,water content,initial concentration,flow rate,and oxygen content.The experimental results show that the energy injected into the NTP system has a positive correlation to voltage and frequency.Oxygen has the greatest influence on TCB decomposition.The optimal reaction condition was at 15 kV,1000 Hz,an initial concentration of 20 mg m^?3,a flow rate of 2 l min^?1,H2O at 4%,and O2 at 0%.Under this condition,the TCB removal efficiency could reach 92%.According to the generated product backstepping,the hydroxyl radical(·OH)plays an important role in TCB decomposition due to its strong oxidation,which participates in the dechlorination and oxidation reactions as free radicals,and the possible decomposition pathway of TCB by NTP is inferred from the identified byproducts.It is of great significance to investigate the influence of the parameters of TCB decomposition using NTP technology in order to provide references for industrial application.展开更多
In this paper,narrow-pulse power discharge is used to study the synergistic control of mercury and dioxins,in which 1,2,4-trichlorobenzene(TCB)was used as a dioxin analog,by using a selfdesigned experimental system.Th...In this paper,narrow-pulse power discharge is used to study the synergistic control of mercury and dioxins,in which 1,2,4-trichlorobenzene(TCB)was used as a dioxin analog,by using a selfdesigned experimental system.The competitive effects of NO,SO2 and HC1 on the TCB removal by non-thermal plasma are discussed.The influence of acid gas on TCB degradation is reflected in the competitive effect.NO has the greatest influence on TCB degradation efficiency.The oxidation efficiency of Hg°decreased by about 10%in all three acidic gas atmospheres,and the effect of each gas component on Hg()oxidation is complex.In the flue gas atmosphere of'acid gas+Hg°+TCB',the mechanism of the synergistic control of Hg°and TCB by the nonthermal plasma is different,which has competition and promotion relationship between each other.The contribution of various flue gas components to the results was complicated,but the overall experimental results show that the synergistic control effect of the system can continue to improve.According to the generated product backstepping,-OH plays an important role in the synergistic control of the degradation of Hg°and TCB.Through this study,we hope to provide basic research data for the collaborative control of flue gas in the incineration industry.展开更多
Hollow microsphere structure cobalt hydroxide(h-Co(OH)2) was synthesized via an optimized solvothermal-hydrothermal process and applied to activate peroxymonosulfate(PMS) for degradation of a typical pharmaceutically ...Hollow microsphere structure cobalt hydroxide(h-Co(OH)2) was synthesized via an optimized solvothermal-hydrothermal process and applied to activate peroxymonosulfate(PMS) for degradation of a typical pharmaceutically active compound,ibuprofen(IBP).The material characterizations confirmed the presence of the microscale hollow spheres with thin nanosheets shell in h-Co(OH)2,and the crystalline phase was assigned to a-Co(OH)2.h-Co(OH)2 could efficiently activate PMS for radicals production,and 98.6% of IBP was degraded at 10 min.The activation of PMS by h-Co(OH)2 was a pHindependent process,and pH 7 was the optimum condition for the activation-degradation system.Scavenger quenching test indicated that the sulfate radical(SO4^·-) was the primary reactive oxygen species for IBP degradation,which contributed to 75.7%.Fukui index(f^-) based on density functional theory(DFT) calculation predicted the active sites of IBP molecule for SO4^·- attack,and then IBP degradation pathway was proposed by means of intermediates identification and theoretical calculation.The developed hollow Co(OH)2 used to efficiently activate PMS is promising and innovative alternative for organic contaminants removal from water and wastewater.展开更多
Global warming caused primarily by excessive emissions of CO_(2) has attracted worldwide attention.Herein,three 2-hydroxypyridium ionic liquids(ILs)based task-specific deep eutectic solvents(DESs)were synthesized to a...Global warming caused primarily by excessive emissions of CO_(2) has attracted worldwide attention.Herein,three 2-hydroxypyridium ionic liquids(ILs)based task-specific deep eutectic solvents(DESs)were synthesized to absorb CO_(2) and physical properties including density,viscosity,and melting points were measured to explore the effect on CO_(2) absorption.The CO_(2) absorption capacities of the ILs-based task-specific DESs were investigated at different pressures and temperatures,which showed that the maximum absorption capacity of the DES was up to 1.48 molCO_(2)·molDES^(-1) or 0.233 gCO_(2)·gDES^(-1) at the atmospheric pressure and 25℃.The plausible absorption mechanism was also proposed by a combination of 1:1 and 2:1 stoichiometric reactions of CO_(2) and the IL-based task-specific DES via multiple-site absorption,which was confirmed by ^(13)C and ^(1)H nuclear magnetic resonance(NMR),Fourier transform infrared(FT-IR)spectroscopy,quantum chemical calculation,and reaction equilibrium thermodynamic modeling.The thermodynamic properties,including absorption Gibbs free energy,absorption enthalpy,and absorption entropy were rationally deduced and explained.Furthermore,the excellent CO_(2) absorption capacity and regenerability of multiple-site task-specific DES make it a new environmentally eco-friendly choice for highly efficient CO_(2) absorption and subsequent CO_(2) transformation.展开更多
基金the Major Science and Technology Projects of Shanxi Province(No.20181102017)the Hebei Province Central Guidance Local Science and Technology Development Special(No.19943816G)+1 种基金the Open Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accumulation and Exploitation(under planning)the Fundamental Research Funds for the Central Universities(No.2009QH03).
文摘Non-thermal plasma(NTP)is regarded as a potential application for environmental pollution control due to its ability to remove pollutants.As a major precursor of dioxins,the influence of the parameters of 1,2,4-trichlorobenzene(TCB)decomposition using NTP technology was investigated through a series of experiments,including voltage,frequency,water content,initial concentration,flow rate,and oxygen content.The experimental results show that the energy injected into the NTP system has a positive correlation to voltage and frequency.Oxygen has the greatest influence on TCB decomposition.The optimal reaction condition was at 15 kV,1000 Hz,an initial concentration of 20 mg m^?3,a flow rate of 2 l min^?1,H2O at 4%,and O2 at 0%.Under this condition,the TCB removal efficiency could reach 92%.According to the generated product backstepping,the hydroxyl radical(·OH)plays an important role in TCB decomposition due to its strong oxidation,which participates in the dechlorination and oxidation reactions as free radicals,and the possible decomposition pathway of TCB by NTP is inferred from the identified byproducts.It is of great significance to investigate the influence of the parameters of TCB decomposition using NTP technology in order to provide references for industrial application.
文摘In this paper,narrow-pulse power discharge is used to study the synergistic control of mercury and dioxins,in which 1,2,4-trichlorobenzene(TCB)was used as a dioxin analog,by using a selfdesigned experimental system.The competitive effects of NO,SO2 and HC1 on the TCB removal by non-thermal plasma are discussed.The influence of acid gas on TCB degradation is reflected in the competitive effect.NO has the greatest influence on TCB degradation efficiency.The oxidation efficiency of Hg°decreased by about 10%in all three acidic gas atmospheres,and the effect of each gas component on Hg()oxidation is complex.In the flue gas atmosphere of'acid gas+Hg°+TCB',the mechanism of the synergistic control of Hg°and TCB by the nonthermal plasma is different,which has competition and promotion relationship between each other.The contribution of various flue gas components to the results was complicated,but the overall experimental results show that the synergistic control effect of the system can continue to improve.According to the generated product backstepping,-OH plays an important role in the synergistic control of the degradation of Hg°and TCB.Through this study,we hope to provide basic research data for the collaborative control of flue gas in the incineration industry.
基金partially supported by the National Natural Science Foundation of China(Nos.21906001 and 51721006)supported by MOE Key Laboratory of Resources and Environmental Systems Optimization(NCEPU)
文摘Hollow microsphere structure cobalt hydroxide(h-Co(OH)2) was synthesized via an optimized solvothermal-hydrothermal process and applied to activate peroxymonosulfate(PMS) for degradation of a typical pharmaceutically active compound,ibuprofen(IBP).The material characterizations confirmed the presence of the microscale hollow spheres with thin nanosheets shell in h-Co(OH)2,and the crystalline phase was assigned to a-Co(OH)2.h-Co(OH)2 could efficiently activate PMS for radicals production,and 98.6% of IBP was degraded at 10 min.The activation of PMS by h-Co(OH)2 was a pHindependent process,and pH 7 was the optimum condition for the activation-degradation system.Scavenger quenching test indicated that the sulfate radical(SO4^·-) was the primary reactive oxygen species for IBP degradation,which contributed to 75.7%.Fukui index(f^-) based on density functional theory(DFT) calculation predicted the active sites of IBP molecule for SO4^·- attack,and then IBP degradation pathway was proposed by means of intermediates identification and theoretical calculation.The developed hollow Co(OH)2 used to efficiently activate PMS is promising and innovative alternative for organic contaminants removal from water and wastewater.
基金financial support from the National Natural Science Foundation of China(22278134,22472055)。
文摘Global warming caused primarily by excessive emissions of CO_(2) has attracted worldwide attention.Herein,three 2-hydroxypyridium ionic liquids(ILs)based task-specific deep eutectic solvents(DESs)were synthesized to absorb CO_(2) and physical properties including density,viscosity,and melting points were measured to explore the effect on CO_(2) absorption.The CO_(2) absorption capacities of the ILs-based task-specific DESs were investigated at different pressures and temperatures,which showed that the maximum absorption capacity of the DES was up to 1.48 molCO_(2)·molDES^(-1) or 0.233 gCO_(2)·gDES^(-1) at the atmospheric pressure and 25℃.The plausible absorption mechanism was also proposed by a combination of 1:1 and 2:1 stoichiometric reactions of CO_(2) and the IL-based task-specific DES via multiple-site absorption,which was confirmed by ^(13)C and ^(1)H nuclear magnetic resonance(NMR),Fourier transform infrared(FT-IR)spectroscopy,quantum chemical calculation,and reaction equilibrium thermodynamic modeling.The thermodynamic properties,including absorption Gibbs free energy,absorption enthalpy,and absorption entropy were rationally deduced and explained.Furthermore,the excellent CO_(2) absorption capacity and regenerability of multiple-site task-specific DES make it a new environmentally eco-friendly choice for highly efficient CO_(2) absorption and subsequent CO_(2) transformation.
