Hydroxyapatite nanoparticles(HAP NPs)were synthesized by a one‐step hydrothermal method.The surface of HAP NPs was grafted-SH and-COOH chelating groups via in situ surface‐modification with iminodiacetic acid(IDA)an...Hydroxyapatite nanoparticles(HAP NPs)were synthesized by a one‐step hydrothermal method.The surface of HAP NPs was grafted-SH and-COOH chelating groups via in situ surface‐modification with iminodiacetic acid(IDA)and 3‐mercaptopropyl trimethoxysilane(MPS)to afford dual surface‐capped nano‐amendment HAPIDA/MPS.The structure of HAP‐IDA/MPS was characterized,and its adsorption performance for Hg^(2+),Cu^(2+),Zn^(2+),Ni^(2+),Co^(2+),and Cd^(2+)was evaluated.The total adsorption capacity of 0.10 g HAP‐IDA/MPS nano‐amendment for Hg^(2+),Cu^(2+),Zn^(2+),Ni^(2+),Co^(2+),and Cd^(2+)with an initial mass concentration of 20 mg·L^(-1) reached 13.7 mg·g^(-1),about 4.3 times as much as that of HAP.Notably,HAP‐IDA/MPS nano‐amendment displayed the highest immobilization rate for Hg^(2+),possibly because of its chemical reaction with-SH to form sulfide,possessing the lowest solubility product constant among a variety of metal sulfides.展开更多
过氧化物酶广泛存在于天然水体,在外加过氧化氢(H_(2)O_(2))的条件下可有效地降解水体中的有机污染物.17β-雌二醇(E2)是水体中常见的雌激素,低浓度下仍具有极强的内分泌干扰效应,过氧化物酶可通过利用腐殖质产生的H_(2)O_(2);从而影响...过氧化物酶广泛存在于天然水体,在外加过氧化氢(H_(2)O_(2))的条件下可有效地降解水体中的有机污染物.17β-雌二醇(E2)是水体中常见的雌激素,低浓度下仍具有极强的内分泌干扰效应,过氧化物酶可通过利用腐殖质产生的H_(2)O_(2);从而影响腐殖质介导的E_(2)的光化学过程,但其是否可直接影响E2的光转化尚不清楚.本文系统地研究了辣根过氧化物酶(HRP)对E_(2)光降解过程的影响.研究发现有活性的HRP可显著促进E2的光化学转化,且促进作用随着活性的增大而增强.活性氧猝灭实验结果表明E_(2)自敏化产生的活性物种可激活HRP,从而促进了E_(2)在光照条件下的酶降解,且E_(2)在HRP溶液中的光解产物实验进一步证实了这一过程.HRP对E2酶降解的效率高于常见水质成分Suwannnee River Humic Acid(SRHA)和Fe^(3+)的促进效率,弱于NO_(3)^(-)引起的促进效率,表明HRP对污染物在天然水体中的环境归趋的影响是值得关注的.本文为深入认识雌激素的环境归趋提供科学数据,并为酶处理技术在水处理方面的应用带来巨大前景.展开更多
文摘Hydroxyapatite nanoparticles(HAP NPs)were synthesized by a one‐step hydrothermal method.The surface of HAP NPs was grafted-SH and-COOH chelating groups via in situ surface‐modification with iminodiacetic acid(IDA)and 3‐mercaptopropyl trimethoxysilane(MPS)to afford dual surface‐capped nano‐amendment HAPIDA/MPS.The structure of HAP‐IDA/MPS was characterized,and its adsorption performance for Hg^(2+),Cu^(2+),Zn^(2+),Ni^(2+),Co^(2+),and Cd^(2+)was evaluated.The total adsorption capacity of 0.10 g HAP‐IDA/MPS nano‐amendment for Hg^(2+),Cu^(2+),Zn^(2+),Ni^(2+),Co^(2+),and Cd^(2+)with an initial mass concentration of 20 mg·L^(-1) reached 13.7 mg·g^(-1),about 4.3 times as much as that of HAP.Notably,HAP‐IDA/MPS nano‐amendment displayed the highest immobilization rate for Hg^(2+),possibly because of its chemical reaction with-SH to form sulfide,possessing the lowest solubility product constant among a variety of metal sulfides.
文摘过氧化物酶广泛存在于天然水体,在外加过氧化氢(H_(2)O_(2))的条件下可有效地降解水体中的有机污染物.17β-雌二醇(E2)是水体中常见的雌激素,低浓度下仍具有极强的内分泌干扰效应,过氧化物酶可通过利用腐殖质产生的H_(2)O_(2);从而影响腐殖质介导的E_(2)的光化学过程,但其是否可直接影响E2的光转化尚不清楚.本文系统地研究了辣根过氧化物酶(HRP)对E_(2)光降解过程的影响.研究发现有活性的HRP可显著促进E2的光化学转化,且促进作用随着活性的增大而增强.活性氧猝灭实验结果表明E_(2)自敏化产生的活性物种可激活HRP,从而促进了E_(2)在光照条件下的酶降解,且E_(2)在HRP溶液中的光解产物实验进一步证实了这一过程.HRP对E2酶降解的效率高于常见水质成分Suwannnee River Humic Acid(SRHA)和Fe^(3+)的促进效率,弱于NO_(3)^(-)引起的促进效率,表明HRP对污染物在天然水体中的环境归趋的影响是值得关注的.本文为深入认识雌激素的环境归趋提供科学数据,并为酶处理技术在水处理方面的应用带来巨大前景.
