Adsorption properties of functionalized graphene composite adsorbents on Cr(Ⅵ)
Graphene oxide/polyvinyl alcohol(GPGO)composite adsorbents were prepared by in-situ hydrothermal method using graphene oxide(GO)and polyvinyl oxide(PVA)as raw materials,3-glycidyl ether oxypropyl trimethoxysilane(GLYMO)as linker.The structure of the GPGO adsorbent was characterized by modern methods including infrared and scanning electron microscopy.The effects of m(GLYMO),pH value,adsorption time,Cr(Ⅵ)initial mass concentration,and coexisting anions on the adsorption performance of GPGO for Cr(Ⅵ)were measured through static adsorption experiments.The research results indicate that the linking effect of GLYMO and strong acidic environment can greatly promote the adsorption of GPGO for Cr(Ⅵ).The second-order kinetics and Langmuir isotherm adsorption model can well describe the adsorption process of GPGO on Cr(Ⅵ).The Langmuir model calculates that the maximum adsorption capacity of GPGO adsorbent on Cr(Ⅵ)is 384.6 mg/g.The presence of Cl-and NO3-has little effect on the adsorption performance of GPGO for Cr(Ⅵ),but SO42-has a strong inhibitory effect on this adsorption process.
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