A hydrophobic complex of Cu2+[bis-salicylic aldehyde-o-phenylenediamine],Cu-SPA,was prepared and used as a heterogeneous photocatalyst to degrade organic pollutants in water under visible irradiation(420 nm)at neutral...A hydrophobic complex of Cu2+[bis-salicylic aldehyde-o-phenylenediamine],Cu-SPA,was prepared and used as a heterogeneous photocatalyst to degrade organic pollutants in water under visible irradiation(420 nm)at neutral pH.The structure of complex was characterized by using nuclear magnetic resonance(NMR),elemental analysis,IR and UV-vis spectrometries.Degradation of Rhodamine B(RhB),Sulforhodamine B(SRB)and Benzoic acid(BA)in water were used as model reactions to evaluate the photocatalytic activities of Cu-SPA.The results indicated that RhB and SRB were easily adsorbed on the hydrophobic surface of Cu-SPA from aqueous solution(the maximum adsorption amount:Qmax=11.09 and 8.05μmol/g,respectively).Under visible irradiation,RhB and SRB were decolorized completely after 210 and 240 min,respectively,and BA was removed completely after 5 h.The efficiency of H2O2was>95%,in contrast to that of the reaction without catalyst or light(<20%).In water soluble medium,the hydrophobic Cu-SPA can be used more than 6 cycles.ESR results and the behavior of cyclic voltammetry showed that,in the reaction process,Cu2+-SPA was reduced to intermediate state Cu+-SPA firstly,which was extremely unstable and reacted rapidly with H2O2,leading to high reactive oxygen species(·OH radical)to degrade the substrate.展开更多
2-methylisoboneol(2-MIB)and geosmin are two typical earthy-musty odour compounds in freshwater.In order to investigate the olfactory thresholds of 2-MIB and geosmin in black carp(Mylopharyngodon piceus)and bighead car...2-methylisoboneol(2-MIB)and geosmin are two typical earthy-musty odour compounds in freshwater.In order to investigate the olfactory thresholds of 2-MIB and geosmin in black carp(Mylopharyngodon piceus)and bighead carp(Hypophthalmichthys nobilis),an improved and optimized pre-treatment method of adsorbing the earthy-musty odours combined with the technology of gas chromatography following microwave distillation-headspace solid-phase microextraction was developed.The fish back muscle samples were placed in vials with the 2-MIB/geosmin solution and reached the adsorption equilibrium.Some samples were evaluated by a panel of ten members using Flavour Profile Analysis(FPA)method,the remaining sample was used for instrumental analysis.In fish muscle blocks,it took 90 and 105 min to establish the absorption equilibrium of 2-MIB and geosmin,respectively.The olfactory thresholds of 2-MIB in the bodies of black carps and bighead carps were 0.35μg/kg and 0.30μg/kg,respectively,while the geosmin thresholds were 0.59μg/kg and 0.51μg/kg,respectively.The concentrations of 2-MIB and geosmin in the bodies of black carps were slightly higher than in bighead carps,which were probably caused by the differences in the body fat content and the volatility of 2-MIB and geosmin.展开更多
In this study,an alternative and cost-effective industrial byproduct phosphorus slag(PS)was utilized to treat simulated Cd-contaminated soil.The modified European Community Bureau of Reference(BCR)sequential extractio...In this study,an alternative and cost-effective industrial byproduct phosphorus slag(PS)was utilized to treat simulated Cd-contaminated soil.The modified European Community Bureau of Reference(BCR)sequential extraction procedure was applied to assess the ability of PS to reduce Cd mobility in contaminated soil by the incubation experiments.The results showed 2%(W/W)PS reduced the exchangeable fraction of Cd by 99.7%,which also increased the pH,electrical conductivity,cation exchange capacity,available phosphorus,and available silicon of the soil.The results suggested that the PS could decrease Cd bioavailability and improve soil nutrition.This was demonstrated by the pot experiments.The Cd accumulation in both pakchoi(Brassica chinensis L.)leaf and root was reduced along with the reduction of the Cd translocation factor(TF)and the bioaccumulation factors(BCF)in pakchoi.In Cd-contaminated soil(3.16 mg·kg^–1),the 2%(W/W)PS reduced the Cd content in the leaf and root of pakchoi by 70.7%and 58.7%,respectively.Meanwhile,the increase of the chlorophyll content in pakchoi and the promotion of pakchoi root system development suggested healthy plant growth in the PS treated soil.展开更多
基金supported by the National Natural Science Foundation of China(21207079,21307073,21177072,21377067)
文摘A hydrophobic complex of Cu2+[bis-salicylic aldehyde-o-phenylenediamine],Cu-SPA,was prepared and used as a heterogeneous photocatalyst to degrade organic pollutants in water under visible irradiation(420 nm)at neutral pH.The structure of complex was characterized by using nuclear magnetic resonance(NMR),elemental analysis,IR and UV-vis spectrometries.Degradation of Rhodamine B(RhB),Sulforhodamine B(SRB)and Benzoic acid(BA)in water were used as model reactions to evaluate the photocatalytic activities of Cu-SPA.The results indicated that RhB and SRB were easily adsorbed on the hydrophobic surface of Cu-SPA from aqueous solution(the maximum adsorption amount:Qmax=11.09 and 8.05μmol/g,respectively).Under visible irradiation,RhB and SRB were decolorized completely after 210 and 240 min,respectively,and BA was removed completely after 5 h.The efficiency of H2O2was>95%,in contrast to that of the reaction without catalyst or light(<20%).In water soluble medium,the hydrophobic Cu-SPA can be used more than 6 cycles.ESR results and the behavior of cyclic voltammetry showed that,in the reaction process,Cu2+-SPA was reduced to intermediate state Cu+-SPA firstly,which was extremely unstable and reacted rapidly with H2O2,leading to high reactive oxygen species(·OH radical)to degrade the substrate.
基金Supported by the National Natural Science Foundation of China(31472293)
文摘2-methylisoboneol(2-MIB)and geosmin are two typical earthy-musty odour compounds in freshwater.In order to investigate the olfactory thresholds of 2-MIB and geosmin in black carp(Mylopharyngodon piceus)and bighead carp(Hypophthalmichthys nobilis),an improved and optimized pre-treatment method of adsorbing the earthy-musty odours combined with the technology of gas chromatography following microwave distillation-headspace solid-phase microextraction was developed.The fish back muscle samples were placed in vials with the 2-MIB/geosmin solution and reached the adsorption equilibrium.Some samples were evaluated by a panel of ten members using Flavour Profile Analysis(FPA)method,the remaining sample was used for instrumental analysis.In fish muscle blocks,it took 90 and 105 min to establish the absorption equilibrium of 2-MIB and geosmin,respectively.The olfactory thresholds of 2-MIB in the bodies of black carps and bighead carps were 0.35μg/kg and 0.30μg/kg,respectively,while the geosmin thresholds were 0.59μg/kg and 0.51μg/kg,respectively.The concentrations of 2-MIB and geosmin in the bodies of black carps were slightly higher than in bighead carps,which were probably caused by the differences in the body fat content and the volatility of 2-MIB and geosmin.
基金Supported by the National Key Research and Development Program of China(2016YFD0800902)Major Technological Innovation Projects of Hubei Province(2017ABA157)Scientific Research and Development Project of Yichang(A18-302-a01)。
文摘In this study,an alternative and cost-effective industrial byproduct phosphorus slag(PS)was utilized to treat simulated Cd-contaminated soil.The modified European Community Bureau of Reference(BCR)sequential extraction procedure was applied to assess the ability of PS to reduce Cd mobility in contaminated soil by the incubation experiments.The results showed 2%(W/W)PS reduced the exchangeable fraction of Cd by 99.7%,which also increased the pH,electrical conductivity,cation exchange capacity,available phosphorus,and available silicon of the soil.The results suggested that the PS could decrease Cd bioavailability and improve soil nutrition.This was demonstrated by the pot experiments.The Cd accumulation in both pakchoi(Brassica chinensis L.)leaf and root was reduced along with the reduction of the Cd translocation factor(TF)and the bioaccumulation factors(BCF)in pakchoi.In Cd-contaminated soil(3.16 mg·kg^–1),the 2%(W/W)PS reduced the Cd content in the leaf and root of pakchoi by 70.7%and 58.7%,respectively.Meanwhile,the increase of the chlorophyll content in pakchoi and the promotion of pakchoi root system development suggested healthy plant growth in the PS treated soil.
