Bacterial infections,especially the frequently emerging "superbugs",seriously affect the quality of human life and even threaten human health.As the emerging antimicrobial agents that effectively eradicate p...Bacterial infections,especially the frequently emerging "superbugs",seriously affect the quality of human life and even threaten human health.As the emerging antimicrobial agents that effectively eradicate pathogens,nanomaterials have been widely explored due to their effectiveness against wide-spectrum bacteria and“superbugs”.Of them,Ag/AgX nanostructures(X representing Cl,Br or I)have emerged as an excellent antibacterial agent because of their excellent photocatalytic performance in inactivating pathogens under light irradiation,which provides a new opportunity for the development of high-efficient visible-light driven photocatalytic sterilization.To date,Ag/AgX nanostructures have been widely employed in antibacterial associated fields because they are efficient in producing reactive oxygen species(ROS)and reactive chlorine species(RCS)under visible light irradiation.In this review,we summarized the recent progress of Ag/AgX nanostructures as plasmonic photocatalysts in the antibacterial field,focusing on the antibacterial effects and mechanisms of Ag/AgX nanostructures,as well as their potent applications.Finally,the challenges and prospects of Ag/AgX nanostructures acting as active antibacterial agents were discussed.展开更多
Most efficient visible-light-responsive photocatalysts are in the form of powder,leading to the tedious separation from the reaction media.Herein,we developed a versatile method for the general synthesis of free-stand...Most efficient visible-light-responsive photocatalysts are in the form of powder,leading to the tedious separation from the reaction media.Herein,we developed a versatile method for the general synthesis of free-standing polyacrylonitrile(PAN)/Ag/AgX(X=Br,I)nanofiber mats,where fibrous PAN/Ag precursor was firstly prepared via an electroless plating strategy,followed by a direct elemental halogenation with Br2/H2O or I2/ethanol solution.The as-obtained PAN/Ag/AgX nanofiber mats exhibit exceptional photocatalytic activity toward degradation of organic pollutants.Furthermore,the flexibility enables it to be easily recovered after the reaction was completed.This work provides new insights into the fabrication of membrane-based photocatalysts on a large scale.展开更多
Ag–AgX(X = Cl, Br)@TiO_2 nanoparticle-aggregated spheres with different mass ratio of R = TiO2/Ag(X) from 35:1 to 5:1 were synthesized by a facile sol–gel technique with post-photoreduction. The photocatalytic activ...Ag–AgX(X = Cl, Br)@TiO_2 nanoparticle-aggregated spheres with different mass ratio of R = TiO2/Ag(X) from 35:1 to 5:1 were synthesized by a facile sol–gel technique with post-photoreduction. The photocatalytic activities of both Ag–Ag Cl@TiO_2 and Ag–Ag Br@TiO_2 under visible light are effectively improved by ~3 times relative to TiO_2 NPAS under the simulated sunlight for the decomposition of methyl orange(MO). Ag–AgBr@TiO_2 showed 30% improvement and less stable in photocatalytic activity than that of AgCl@TiO_2. The role of Ag and Ag X nanoparticles on the surface of Ag–Ag X(X = Cl,Br)@TiO_2 was discussed. Ag on these samples not onlycan efficiently harvest visible light especially for Ag Cl, but also efficiently separate excited electrons and holes via the fast electron transfer from Ag X(X = Cl, Br) to metal Ag nanoparticles and then to TiO_2-aggregated spheres on the surface of heterostructure. On the basis of their efficient and stable photocatalytic activities under visible-light irradiation, these photocatalysts could be widely used for degradation of organic pollutants in aqueous solution.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(Nos.21304044,51663019 and 22062017)the Natural Science Foundation of Inner Mongolia Autonomous Region(Nos.2015MS0520,2019JQ03 and 2019BS02004)+2 种基金the State Key Laboratory of Medicinal Chemical Biology(Nos.201603006 and 2018051)the State Key Laboratory of Polymer Physics and Chemistry(No.2018-08)the Program of Higher-Level Talents of Inner Mongolia University(No.30105-125136).
文摘Bacterial infections,especially the frequently emerging "superbugs",seriously affect the quality of human life and even threaten human health.As the emerging antimicrobial agents that effectively eradicate pathogens,nanomaterials have been widely explored due to their effectiveness against wide-spectrum bacteria and“superbugs”.Of them,Ag/AgX nanostructures(X representing Cl,Br or I)have emerged as an excellent antibacterial agent because of their excellent photocatalytic performance in inactivating pathogens under light irradiation,which provides a new opportunity for the development of high-efficient visible-light driven photocatalytic sterilization.To date,Ag/AgX nanostructures have been widely employed in antibacterial associated fields because they are efficient in producing reactive oxygen species(ROS)and reactive chlorine species(RCS)under visible light irradiation.In this review,we summarized the recent progress of Ag/AgX nanostructures as plasmonic photocatalysts in the antibacterial field,focusing on the antibacterial effects and mechanisms of Ag/AgX nanostructures,as well as their potent applications.Finally,the challenges and prospects of Ag/AgX nanostructures acting as active antibacterial agents were discussed.
基金financially supported by the Key Project of Natural Science Foundation of Tianjin (No. 18JCZDJC97200)
文摘Most efficient visible-light-responsive photocatalysts are in the form of powder,leading to the tedious separation from the reaction media.Herein,we developed a versatile method for the general synthesis of free-standing polyacrylonitrile(PAN)/Ag/AgX(X=Br,I)nanofiber mats,where fibrous PAN/Ag precursor was firstly prepared via an electroless plating strategy,followed by a direct elemental halogenation with Br2/H2O or I2/ethanol solution.The as-obtained PAN/Ag/AgX nanofiber mats exhibit exceptional photocatalytic activity toward degradation of organic pollutants.Furthermore,the flexibility enables it to be easily recovered after the reaction was completed.This work provides new insights into the fabrication of membrane-based photocatalysts on a large scale.
基金supported by the China Postdoctoral Science Foundation (2016M602647)the Science and Technology Research Project of Chongqing Municipal Education Commission of China (KJ1400607)+3 种基金the Fundamental Research Funds for the Central Universities (CQDXWL-2014-001)NSFCQ (cstc2015jcyj A20020)NSFC (51572040, 51402112)National High Technology Research and Development Program of China (2015AA034801)
文摘Ag–AgX(X = Cl, Br)@TiO_2 nanoparticle-aggregated spheres with different mass ratio of R = TiO2/Ag(X) from 35:1 to 5:1 were synthesized by a facile sol–gel technique with post-photoreduction. The photocatalytic activities of both Ag–Ag Cl@TiO_2 and Ag–Ag Br@TiO_2 under visible light are effectively improved by ~3 times relative to TiO_2 NPAS under the simulated sunlight for the decomposition of methyl orange(MO). Ag–AgBr@TiO_2 showed 30% improvement and less stable in photocatalytic activity than that of AgCl@TiO_2. The role of Ag and Ag X nanoparticles on the surface of Ag–Ag X(X = Cl,Br)@TiO_2 was discussed. Ag on these samples not onlycan efficiently harvest visible light especially for Ag Cl, but also efficiently separate excited electrons and holes via the fast electron transfer from Ag X(X = Cl, Br) to metal Ag nanoparticles and then to TiO_2-aggregated spheres on the surface of heterostructure. On the basis of their efficient and stable photocatalytic activities under visible-light irradiation, these photocatalysts could be widely used for degradation of organic pollutants in aqueous solution.
