Because of its significant toxicological effects on the environment and human health,arsenic(As)is a major global issue.In this study,an Fe-based metal-organic framework(MOF)(Materials of Institut Lavoisier:MIL-100(Fe...Because of its significant toxicological effects on the environment and human health,arsenic(As)is a major global issue.In this study,an Fe-based metal-organic framework(MOF)(Materials of Institut Lavoisier:MIL-100(Fe))which was impregnated with reduced graphene oxide(rGO)by using a simple hydrothermal method and coated with birnessitetype manganese oxide(δ-MnO2)using the one-pot reaction process(MIL-100(Fe)/rGO/δ-MnO2 nanocomposites)was synthesized and applied successfully in As removal.The removal efficiency was rapid,the equilibrium was achieved in 40 min and 120 min for As(Ⅲ)and As(Ⅴ),respectively,at a level of 5 mg/L.The maximum adsorption capacities of As(Ⅲ)and As(Ⅴ)at pH 2 were 192.67 mg/g and 162.07 mg/g,respectively.The adsorbent revealed high stability in pH range 2-9 and saturated adsorbent can be fully regenerated at least five runs.The adsorption process can be described by the pseudo-second-order kinetic model and Langmuir monolayer adsorption.The adsorption mechanisms consisted of electrostatic interaction,oxidation and inner sphere surface complexation.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 51302079 and U1510103)the Natural Science Foundation of Hunan Province (Grant No. 2017JJ1008)
基金supported by the Social Development Fund of Guangdong Province(No.2017A020216018)the Guangzhou Science and Technology Project(No.201904010319)
文摘Because of its significant toxicological effects on the environment and human health,arsenic(As)is a major global issue.In this study,an Fe-based metal-organic framework(MOF)(Materials of Institut Lavoisier:MIL-100(Fe))which was impregnated with reduced graphene oxide(rGO)by using a simple hydrothermal method and coated with birnessitetype manganese oxide(δ-MnO2)using the one-pot reaction process(MIL-100(Fe)/rGO/δ-MnO2 nanocomposites)was synthesized and applied successfully in As removal.The removal efficiency was rapid,the equilibrium was achieved in 40 min and 120 min for As(Ⅲ)and As(Ⅴ),respectively,at a level of 5 mg/L.The maximum adsorption capacities of As(Ⅲ)and As(Ⅴ)at pH 2 were 192.67 mg/g and 162.07 mg/g,respectively.The adsorbent revealed high stability in pH range 2-9 and saturated adsorbent can be fully regenerated at least five runs.The adsorption process can be described by the pseudo-second-order kinetic model and Langmuir monolayer adsorption.The adsorption mechanisms consisted of electrostatic interaction,oxidation and inner sphere surface complexation.
