The mass production and wide usage of surfactants and aromatic compounds disturb seriously the natural ecosystem of physical,chemical and biological processes.The study on the mechanisms of joint toxicity can indicate...The mass production and wide usage of surfactants and aromatic compounds disturb seriously the natural ecosystem of physical,chemical and biological processes.The study on the mechanisms of joint toxicity can indicate the characterization of real environmental behavior and assessment of joint ecological effect.The toxicity to Photobacterium phosphoreum of different mixture systems of cationic surfactant of dodecyl dimethyl benzyl ammonium chloride (DDBAC) and three substituted aromatic compounds according to equi-concentration ratio of 1∶1,as well as individual toxicity,were determined respectively.They were evaluated by toxicity unit (TU),additive index (AI),similarity parameter (λ),and mixtures toxicity index (MTI).Four evaluating methods were compared and the modes of joint action of different systems were analyzed.It was shown that coherent results were obtained by four different evaluating methods in most situations.Conclusions can be drawn that the joint effects of different mixture systems were synergistic.Mechanisms of joint toxicity action could be discussed according to luminescence principle of Photobacterium phosphoreum and molecule structures of the mixture components.展开更多
随着新型冠状病毒肺炎(COVID-19)在全球的流行,主要成分为苯扎氯铵的消毒剂大量使用对环境带来威胁.本研究通过水热法成功制备了铁基金属有机骨架MIL-88A,将其作为光催化剂成功实现了苯扎氯铵在可见光下的高效降解.通过SEM、XRD、XPS以...随着新型冠状病毒肺炎(COVID-19)在全球的流行,主要成分为苯扎氯铵的消毒剂大量使用对环境带来威胁.本研究通过水热法成功制备了铁基金属有机骨架MIL-88A,将其作为光催化剂成功实现了苯扎氯铵在可见光下的高效降解.通过SEM、XRD、XPS以及UV-visDRS等表征方法研究了MIL-88A的形貌、结构以及光催化性能.为了达到光催化降解苯扎氯铵的最佳效率,探究了MIL-88A在不同条件下的光催化降解性能.结果表明,MIL-88A在pH=5,H2O2投加量为0.9 mL·L^(-1),MIL-88A剂量为0.25 g·L^(-1)时,降解效果最好,35 min DDBAC降解效率达到100%.采用UHPLC-Q-TOF-MS确定了降解中间产物,分析了苯扎氯铵可能的降解途径.此外,基于分子轨道理论和自由基淬灭实验证明了氧化降解苯扎氯铵过程中羟基自由基是主要贡献者.通过发光细菌法对DDBAC及其中间体的毒性进行了评估,结果表明,MIL-88A可见光光芬顿工艺能够实现溶液脱毒.光催化降解循环实验以及对催化剂反应前后的表征证明了MIL-88A具有较高的稳定性.展开更多
文摘The mass production and wide usage of surfactants and aromatic compounds disturb seriously the natural ecosystem of physical,chemical and biological processes.The study on the mechanisms of joint toxicity can indicate the characterization of real environmental behavior and assessment of joint ecological effect.The toxicity to Photobacterium phosphoreum of different mixture systems of cationic surfactant of dodecyl dimethyl benzyl ammonium chloride (DDBAC) and three substituted aromatic compounds according to equi-concentration ratio of 1∶1,as well as individual toxicity,were determined respectively.They were evaluated by toxicity unit (TU),additive index (AI),similarity parameter (λ),and mixtures toxicity index (MTI).Four evaluating methods were compared and the modes of joint action of different systems were analyzed.It was shown that coherent results were obtained by four different evaluating methods in most situations.Conclusions can be drawn that the joint effects of different mixture systems were synergistic.Mechanisms of joint toxicity action could be discussed according to luminescence principle of Photobacterium phosphoreum and molecule structures of the mixture components.
文摘随着新型冠状病毒肺炎(COVID-19)在全球的流行,主要成分为苯扎氯铵的消毒剂大量使用对环境带来威胁.本研究通过水热法成功制备了铁基金属有机骨架MIL-88A,将其作为光催化剂成功实现了苯扎氯铵在可见光下的高效降解.通过SEM、XRD、XPS以及UV-visDRS等表征方法研究了MIL-88A的形貌、结构以及光催化性能.为了达到光催化降解苯扎氯铵的最佳效率,探究了MIL-88A在不同条件下的光催化降解性能.结果表明,MIL-88A在pH=5,H2O2投加量为0.9 mL·L^(-1),MIL-88A剂量为0.25 g·L^(-1)时,降解效果最好,35 min DDBAC降解效率达到100%.采用UHPLC-Q-TOF-MS确定了降解中间产物,分析了苯扎氯铵可能的降解途径.此外,基于分子轨道理论和自由基淬灭实验证明了氧化降解苯扎氯铵过程中羟基自由基是主要贡献者.通过发光细菌法对DDBAC及其中间体的毒性进行了评估,结果表明,MIL-88A可见光光芬顿工艺能够实现溶液脱毒.光催化降解循环实验以及对催化剂反应前后的表征证明了MIL-88A具有较高的稳定性.
