Three well-defined diblock copolymers ofpoly（methyl methacrylate-b-methacrylic acid） （P（MMA-b-MAA）） were synthesized using atom transfer radical polymerization method and varying poly（methacrylic acid） （PMAA...Three well-defined diblock copolymers ofpoly（methyl methacrylate-b-methacrylic acid） （P（MMA-b-MAA）） were synthesized using atom transfer radical polymerization method and varying poly（methacrylic acid） （PMAA） chain lengths. These copolymers were blended with PVC to fabricate porous membranes via phase inversion process. Membrane morphologies were observed by scanning electron microscopy （SEM）, and chemical composition changes of the membrane surfaces were measured by X-ray photoelectron spectroscopy （XPS）. Static and dynamic protein adsorption experiments were used to evaluate antifouling properties of the blend membranes. It was found that, the blend membranes containing longer PMAA arm length showed lower static protein adsorption, higher water permeation flux and better protein solution flux recovery.展开更多
Herein, functionalized graphene oxide（GO） was prepared by the covalent functionalization with amino acids（lysine, glycine, glutamic acid and tyrosine） in this study. Zeta potential results demonstrated that covale...Herein, functionalized graphene oxide（GO） was prepared by the covalent functionalization with amino acids（lysine, glycine, glutamic acid and tyrosine） in this study. Zeta potential results demonstrated that covalent functionalization of GO with amino acids was favourable for their homogeneous dispersion in water and organic solvents. Based on the higher absolute value of zeta potential and the better dipersion stability of GO-lysine, the PVDF/GO-lysine hybrid membranes were then prepared via the phase inversion induced by immersion precipitation technique. SEM images showed a better pore diameter and porosity distribution on the PVDF/GO-lysine membrane surface. The zeta potential absolute value of the PVDF/GO-lysine membrane surface was higher than that of the virgin PVDF membrane. Furthermore, the PVDF/GO-lysine membranes surface exhibited good hydrophilicity. The water flux of PVDF/GO-lysine membranes can reach two times of that of the virgin PVDF membrane. And the BSA adsorbed amount on PVDF/GO-lysine surface was decreased to 0.82 mg/cm^2 for PVDF/GO-lysine-8% membrane. Filtration experiment results indicated that the fouling resistance was significantly improved for the PVDF/GO-lysine membranes. As a result, lysine functionalized GO will provide a promising method to fabricate graphene oxide based hybrid membranes with effective antifouling property and hydrophilicity.展开更多
The relationship of corrosion resistance and antifouling behavior of 19 Cu alloys exposed to seawater of Qingdao ,Xiamen,Yulin sea areas in China for 1,2,4,8 year intervals was studied .The experiments were carried on...The relationship of corrosion resistance and antifouling behavior of 19 Cu alloys exposed to seawater of Qingdao ,Xiamen,Yulin sea areas in China for 1,2,4,8 year intervals was studied .The experiments were carried on by analyzing the composition of corrosion films formed on the surface of alloy specimens during the immersion time and by using OM,SEM,EDXA and AES experiment methods.The results verify the view point that it is the cuprous oxide film which played an important role in antifouling property of Cu alloys in seawater and throw a light on the view point in details further.The influence of different sea areas on the antifouling property of Cu alloys is also discussed.展开更多
Sustainable,environmentally friendly and low-energy desalination materials have important research value for the increasing demand of freshwater year by year.However,it is a huge challenge to maintain high heat energy...Sustainable,environmentally friendly and low-energy desalination materials have important research value for the increasing demand of freshwater year by year.However,it is a huge challenge to maintain high heat energy transfer efficiency without reducing the heat conversion capacity of specific solar photothermal conversion materials.Moreover,their efficiency and durability are greatly limited by the problems of seawater corrosion,oil,and bacteria pollutions.Till now,no related work has been reported to solve all the aforementioned problems via a simple four-birds-with-one-stone strategy.Herein,a class of multifunctional porous photothermal silver(Ag)modified Ti foams(Tf-TA/Ag series materials)is prepared for the development of advanced solar water evaporation devices,and provides alternative materials for alleviating freshwater crisis and treating sewage.The oil contact angle(OCA)changes from 41°to 180°,which significantly reduces the adhesion of oil.In addition,Tf-TA2/Ag sample also shows an excellent and sustained antibacterial effect,which maintains above 99.9%of antibacterial rate after repeated 5 times.The surface temperature of the Tf-TA2/Ag sample reaches 52.5℃ after simulated sun irradiation for 20 min,which is significantly higher than that of the contact groups(water:36.4℃,Ti foam:38.2℃ and Tf-TA2:40.9℃).The capacity of seawater evaporation and salt removal is enhanced due to the excellent photothermal properties,low reflectance,and uniform heat dissipation pores.The water production efficiency of Tf-TA2/Ag sample is 1.41 kg·m^(-2)·h^(-1) in artificial seawater and 0.76 kg·m^(-2)·h^(-1) in oily sewage under simulated sun irradiation.Furthermore,the hydrophilic and oleophobic properties of Tf-TA2/Ag are critical to extracting water from oil/water mixture in diverse water environments.Ultimately,this four-birds-with-one-stone approach provides a new perspective for the improvement of solar seawater desalination performance.展开更多
基金supported by the National 973 Program(No.2009CB623402)the National Natural Science Foundation of China(No.20974094)
文摘Three well-defined diblock copolymers ofpoly（methyl methacrylate-b-methacrylic acid） （P（MMA-b-MAA）） were synthesized using atom transfer radical polymerization method and varying poly（methacrylic acid） （PMAA） chain lengths. These copolymers were blended with PVC to fabricate porous membranes via phase inversion process. Membrane morphologies were observed by scanning electron microscopy （SEM）, and chemical composition changes of the membrane surfaces were measured by X-ray photoelectron spectroscopy （XPS）. Static and dynamic protein adsorption experiments were used to evaluate antifouling properties of the blend membranes. It was found that, the blend membranes containing longer PMAA arm length showed lower static protein adsorption, higher water permeation flux and better protein solution flux recovery.
基金financially supported by the National Natural Science Foundation of China(No.51303028)Test Center of Fuzhou University
文摘Herein, functionalized graphene oxide（GO） was prepared by the covalent functionalization with amino acids（lysine, glycine, glutamic acid and tyrosine） in this study. Zeta potential results demonstrated that covalent functionalization of GO with amino acids was favourable for their homogeneous dispersion in water and organic solvents. Based on the higher absolute value of zeta potential and the better dipersion stability of GO-lysine, the PVDF/GO-lysine hybrid membranes were then prepared via the phase inversion induced by immersion precipitation technique. SEM images showed a better pore diameter and porosity distribution on the PVDF/GO-lysine membrane surface. The zeta potential absolute value of the PVDF/GO-lysine membrane surface was higher than that of the virgin PVDF membrane. Furthermore, the PVDF/GO-lysine membranes surface exhibited good hydrophilicity. The water flux of PVDF/GO-lysine membranes can reach two times of that of the virgin PVDF membrane. And the BSA adsorbed amount on PVDF/GO-lysine surface was decreased to 0.82 mg/cm^2 for PVDF/GO-lysine-8% membrane. Filtration experiment results indicated that the fouling resistance was significantly improved for the PVDF/GO-lysine membranes. As a result, lysine functionalized GO will provide a promising method to fabricate graphene oxide based hybrid membranes with effective antifouling property and hydrophilicity.
文摘The relationship of corrosion resistance and antifouling behavior of 19 Cu alloys exposed to seawater of Qingdao ,Xiamen,Yulin sea areas in China for 1,2,4,8 year intervals was studied .The experiments were carried on by analyzing the composition of corrosion films formed on the surface of alloy specimens during the immersion time and by using OM,SEM,EDXA and AES experiment methods.The results verify the view point that it is the cuprous oxide film which played an important role in antifouling property of Cu alloys in seawater and throw a light on the view point in details further.The influence of different sea areas on the antifouling property of Cu alloys is also discussed.
基金supported by the National Natural Science Foundation of China(Nos.52263032,62062053,22375109,52061034)the Natural Science Foundation of Inner Mongolia Province(Nos.2020BS01004,2022QN03012)Young Science and Technology Talent Program of Inner Mongolia Province(No.NJYT23001)and a Talent Development Fund of Inner Mongolia Province.
文摘Sustainable,environmentally friendly and low-energy desalination materials have important research value for the increasing demand of freshwater year by year.However,it is a huge challenge to maintain high heat energy transfer efficiency without reducing the heat conversion capacity of specific solar photothermal conversion materials.Moreover,their efficiency and durability are greatly limited by the problems of seawater corrosion,oil,and bacteria pollutions.Till now,no related work has been reported to solve all the aforementioned problems via a simple four-birds-with-one-stone strategy.Herein,a class of multifunctional porous photothermal silver(Ag)modified Ti foams(Tf-TA/Ag series materials)is prepared for the development of advanced solar water evaporation devices,and provides alternative materials for alleviating freshwater crisis and treating sewage.The oil contact angle(OCA)changes from 41°to 180°,which significantly reduces the adhesion of oil.In addition,Tf-TA2/Ag sample also shows an excellent and sustained antibacterial effect,which maintains above 99.9%of antibacterial rate after repeated 5 times.The surface temperature of the Tf-TA2/Ag sample reaches 52.5℃ after simulated sun irradiation for 20 min,which is significantly higher than that of the contact groups(water:36.4℃,Ti foam:38.2℃ and Tf-TA2:40.9℃).The capacity of seawater evaporation and salt removal is enhanced due to the excellent photothermal properties,low reflectance,and uniform heat dissipation pores.The water production efficiency of Tf-TA2/Ag sample is 1.41 kg·m^(-2)·h^(-1) in artificial seawater and 0.76 kg·m^(-2)·h^(-1) in oily sewage under simulated sun irradiation.Furthermore,the hydrophilic and oleophobic properties of Tf-TA2/Ag are critical to extracting water from oil/water mixture in diverse water environments.Ultimately,this four-birds-with-one-stone approach provides a new perspective for the improvement of solar seawater desalination performance.
