There is a growing need to eliminate antibiotic resistance genes(ARGs)in the environment and mitigate widespread antibiotic resistance.Graphitic carbon nitride(g-C_(3)N_(4))was successfully synthesized via facile ther...There is a growing need to eliminate antibiotic resistance genes(ARGs)in the environment and mitigate widespread antibiotic resistance.Graphitic carbon nitride(g-C_(3)N_(4))was successfully synthesized via facile thermal polymerization approach and its pote ntial for adsorption treatment of ARGs in water was examined.Batch adsorption experimental results revealed that g-C_(3)N_(4) powders had robust adsorption activity for the gene ampC and ermB.Adsorption kinetics and isotherms were syste matically investigated to explain the adsorption mechanism.The apparent adsorption equilibrium could be reached within180 min.The adsorption process effectively re moved ARGs(ampC and ermB)from water with 3.2 log and4.2 log reductions,respectively.In addition,experimental data were analyzed by several models and simulated well with Langmuir isotherm and pseudo-second-order model.It indicated that adsorption process might be dominated by the chemical rate-limiting step.Moreover,the effects of temperature and pH on the re moval of ARGs were conducted and the isoelectric point(IEP)was obtained.Finally,we have demonstrated that the g-C_(3)N_(4) is a novel adsorbent and can be used as column packing to remove ARGs by filtration.展开更多
Multiple pollutants including pathogenic microorganism contaminations and emerging organic contaminations(EOCs)have shown a growing threat to the environment,especially the natural waters.However,the control and remov...Multiple pollutants including pathogenic microorganism contaminations and emerging organic contaminations(EOCs)have shown a growing threat to the environment,especially the natural waters.However,the control and removal of pathogenic microorganism contaminations and EOCs have been greatly limited since limited knowledge of their environmental behaviors.Thus,a novel and efficient photocatalyst Ag_(2)O/BiOBr heterojunction was synthesized and used for removal of multiple pollutants including Escherichia coli(E.coli),Staphylococcus aureus(S.aureus),tetracycline and acetaminophen under visible light.The results showed that there were valid electron transfer pathways between BiOBr and Ag_(2)O,the main electron transfer direction was the BiOBr to Ag_(2)O.Photo-generated electrons were stored in Ag_(2)O and thus separation efficiency between holes and photo-generated electrons was obviously enhanced.Active oxygen species were highly produced and eventually end up with the high efficiency of removal of multiple pollutants.For Ag_(2)O/BiOBr with Ag_(2)O content at 3%(the best performance)under visible light,log decrease of E.coli was 7.16(removal efficiency was 100%)in 120 min,log decrease of S.aureus was 7.23(removal efficiency was 100%)in 160 min,C/C0 of tetracycline was 0.06 in 180 min,C/C0 of acetaminophen was 0.17 in 180 min.This work could provide a promising candidate in the actual contaminated natural waters for cleaning multiple pollutants.展开更多
基金the financially support by the National Natural Science Foundation of China as general projects(Nos.21677080 and 21722702)the Natural Science Foundation of Hebei Province(No.B2019202078)。
文摘There is a growing need to eliminate antibiotic resistance genes(ARGs)in the environment and mitigate widespread antibiotic resistance.Graphitic carbon nitride(g-C_(3)N_(4))was successfully synthesized via facile thermal polymerization approach and its pote ntial for adsorption treatment of ARGs in water was examined.Batch adsorption experimental results revealed that g-C_(3)N_(4) powders had robust adsorption activity for the gene ampC and ermB.Adsorption kinetics and isotherms were syste matically investigated to explain the adsorption mechanism.The apparent adsorption equilibrium could be reached within180 min.The adsorption process effectively re moved ARGs(ampC and ermB)from water with 3.2 log and4.2 log reductions,respectively.In addition,experimental data were analyzed by several models and simulated well with Langmuir isotherm and pseudo-second-order model.It indicated that adsorption process might be dominated by the chemical rate-limiting step.Moreover,the effects of temperature and pH on the re moval of ARGs were conducted and the isoelectric point(IEP)was obtained.Finally,we have demonstrated that the g-C_(3)N_(4) is a novel adsorbent and can be used as column packing to remove ARGs by filtration.
基金the financial support by the National Natural Science Foundation of China as general projects(Nos.21722702 and 21677080)the Tianjin Commission of Science and Technology as Key Technologies R&D Projects(Nos.118YFZCSF00730,18YFZCSF00770 and 18ZXSZSF00230)。
文摘Multiple pollutants including pathogenic microorganism contaminations and emerging organic contaminations(EOCs)have shown a growing threat to the environment,especially the natural waters.However,the control and removal of pathogenic microorganism contaminations and EOCs have been greatly limited since limited knowledge of their environmental behaviors.Thus,a novel and efficient photocatalyst Ag_(2)O/BiOBr heterojunction was synthesized and used for removal of multiple pollutants including Escherichia coli(E.coli),Staphylococcus aureus(S.aureus),tetracycline and acetaminophen under visible light.The results showed that there were valid electron transfer pathways between BiOBr and Ag_(2)O,the main electron transfer direction was the BiOBr to Ag_(2)O.Photo-generated electrons were stored in Ag_(2)O and thus separation efficiency between holes and photo-generated electrons was obviously enhanced.Active oxygen species were highly produced and eventually end up with the high efficiency of removal of multiple pollutants.For Ag_(2)O/BiOBr with Ag_(2)O content at 3%(the best performance)under visible light,log decrease of E.coli was 7.16(removal efficiency was 100%)in 120 min,log decrease of S.aureus was 7.23(removal efficiency was 100%)in 160 min,C/C0 of tetracycline was 0.06 in 180 min,C/C0 of acetaminophen was 0.17 in 180 min.This work could provide a promising candidate in the actual contaminated natural waters for cleaning multiple pollutants.
基金supported by the National Natural Science Foundation of China (21722702 and 21872102)Tianjin Municipal Science and Technology Bureau (18YFZCSF00730, 18YFZCSF00770, 18ZXSZSF00230 and 19YFZCSF00740)。
