The Study Of The Heterogeneous Of β-CD In The Adsorption Of P-nitrphenol

β-cyclodextrin has attracted a lot of attentions due to its advantages,such as its hydrophilic exterior and hydrophobic cavity,high selectivity and low price.And the affluent hydroxy of β-CD makes it many possibilities in modifying.So it is widely used in the removing organic molecules from waste water.Renewable β-cyclodextrin(β-CD)was grafted onto the surface of silica gel using(3-chloropropyl)trimethoxysilane and ethylenediamine as linking groups to construct adsorbent in water treatment(CD@CPTMS@Si),and the obtained CD@CPTMS@Si was characterized through FT-IR,XPS,contact anglemeasurement,TGA,solid-state 13C NMR,SEM,and XRD analyses.The effects of initial pH,contact time on the adsorption performance of CD@CPTMS@Si to p-nitrophenol,and the adsorption kinetics,adsorption isotherms,adsorption thermodynamics,reusability and adsorption mechanism were investigated systematically,which indicate the adsorption of p-nitrophenol onto CD@CPTMS@Si is a very fast process and the adsorption equilibrium can be reached in 5 s with acceptable equilibrium adsorption capacity of 41.5 mg/g in pH≥8.5,much faster than many reported adsorbents based on β-CD.The adsorption of p-nitrophenol onto CD@CPTMS@Si follows the pseudo-second-order model,obeys the Freundlich model,and is a feasible,spontaneous and exothermic process which is more favorable in lower temperature.And the formation of inclusion complex and hydrogen bond interaction are two origins of p-nitrophenolbeing adsorbed onto CD@CPTMS@Si.Additionally,CD@CPTMS@Si can be recycled and reused at least five runs with acceptable adsorption capacity,is a very promising adsorbent in the fast adsorption of p-nitrophenol or its analogues from aqueous phase.Renewable β-cyclodextrin(β-CD)was immobilized onto the surface of hybrid silica using ethylenediamineas linking groups to construct an adsorbent in water treatment(CD@Si),and the obtained CD@Si was characterized through FT-IR,XPS,EDX,contact angle measurement,TGA,solid-state 13C NMR,SEM,and XRD analyses.The effect of initial pH,contact time on the adsorption performance of CD@Si for p-nitrophenol,and the adsorption kinetics,adsorption isotherms,adsorption thermodynamics,reusability and adsorption mechanism were investigated systematically,which indicate that the adsorption of p-nitrophenol onto CD@Si is a very fast process.The adsorption equilibrium can be reached in 15 s with an acceptable equilibrium adsorption capacity of 69.6 mg/g at pH 7.0,which is much faster than many reported adsorbents based on p-CD.The adsorption of p-nitrophenol onto CD@Si follows the pseudosecond-order model,obeys the Freundlich model,and is a feasible,spontaneous,and exothermic process which is more favorable at lower temperatures.And the formation of an inclusion complex and a hydrogen bond interaction are two origins of p-nitrophenol being adsorbed onto CD@Si.Additionally,CD@Si can be recycled and reused for at least five runs with an acceptable adsorption capacity,and is a very promising adsorbent for the fast adsorption of p-nitrophenol or its analogues from the aqueous phase.Additionally,this work also provides a strategy to increase the adsorption rate of adsorbents based on β-CD.