用直接观察法、酒石酸亚铁法和铬黑 T 祛对绿茶茶汤组分与23种金属离子的络合性能进行了研究,结果表明,有22种金属离子可与茶汤组分发生络合或还原络合反应,其中有10种金属离子参与了茶多酚的络合。钙离子可与茶汤组分生成低溶解度的络...用直接观察法、酒石酸亚铁法和铬黑 T 祛对绿茶茶汤组分与23种金属离子的络合性能进行了研究,结果表明,有22种金属离子可与茶汤组分发生络合或还原络合反应,其中有10种金属离子参与了茶多酚的络合。钙离子可与茶汤组分生成低溶解度的络合物,其溶解度及稳定性可随反应溶液 pH 升高而下降。钙络合沉淀中的主要茶汤组分是茶多酚,其中以酯型儿茶素含量最高。展开更多
Microplastics are considered as the carrier to heavy metals in the environment.But the sorption ability of microplastics influenced by photo-aging is remaining unclear.In the present study,the sorption of two kinds of...Microplastics are considered as the carrier to heavy metals in the environment.But the sorption ability of microplastics influenced by photo-aging is remaining unclear.In the present study,the sorption of two kinds of metal ions(Cu^2+ and Zn^2+)in the aqueous solution by both the virgin and aged microplastics was investigated.Polyethylene terephthalate(PET)debris,one of the typical kinds of microplastics was chosen in this study.Photo-aging of microplastics in environment was simulated using UV radiation in the laboratory.Date analysis indicated that the aged microplastics had higher adsorption capacity of heavy metals than original ones.This could be related to the increased surface area and oxygen containing function appeared in the surface of aged microplastics after UV radiation.When prolonging the time of radiation,the enhanced adsorption capacities of microplastics appeared for Cu^2+ and Zn^2+.These results showed a great interaction between the aging degree of plastics and sorption capacity to heavy metals.Meanwhile,external conditions including temperature and pH value were also showed great influence to the adsorption behavior.展开更多
文摘用直接观察法、酒石酸亚铁法和铬黑 T 祛对绿茶茶汤组分与23种金属离子的络合性能进行了研究,结果表明,有22种金属离子可与茶汤组分发生络合或还原络合反应,其中有10种金属离子参与了茶多酚的络合。钙离子可与茶汤组分生成低溶解度的络合物,其溶解度及稳定性可随反应溶液 pH 升高而下降。钙络合沉淀中的主要茶汤组分是茶多酚,其中以酯型儿茶素含量最高。
基金supported by the National Nature Science Foundation of China(Nos.5180081612 and 51608002)the University Natural Science Research Key Project of Anhui Province(No.KJ2017A061)
文摘Microplastics are considered as the carrier to heavy metals in the environment.But the sorption ability of microplastics influenced by photo-aging is remaining unclear.In the present study,the sorption of two kinds of metal ions(Cu^2+ and Zn^2+)in the aqueous solution by both the virgin and aged microplastics was investigated.Polyethylene terephthalate(PET)debris,one of the typical kinds of microplastics was chosen in this study.Photo-aging of microplastics in environment was simulated using UV radiation in the laboratory.Date analysis indicated that the aged microplastics had higher adsorption capacity of heavy metals than original ones.This could be related to the increased surface area and oxygen containing function appeared in the surface of aged microplastics after UV radiation.When prolonging the time of radiation,the enhanced adsorption capacities of microplastics appeared for Cu^2+ and Zn^2+.These results showed a great interaction between the aging degree of plastics and sorption capacity to heavy metals.Meanwhile,external conditions including temperature and pH value were also showed great influence to the adsorption behavior.
