Preparation Of Three Dimensional Ordered Macroporous Materials Derived From Chitosan And Their Performances For Chlorobenzene Adsorption

Chlorobenzenes（CBs）,widely used chemical in industrial and agricultural practises,is harmful to human health and ecosystem.The removal technologies can be divided into two major groups,namely degradation and adsorption,and the removal effectiveness depends on structures and performaces of materials to great extent.As it’s efficient and economical,adsorption technology has been widely studied at present.3DOM material is a kind of inverse opal materials,which is mainly prepared with template technique.The material features uniform pore sizes of primary pores and small internal windows among primary pores,the pore size can be modulated via PS spherer size.So3DOM material can improve mass transfer and be widely used in adsorption and catalysis.In this study,in order to explore new efficient and economical adsorbent for CBs,3DOM materials was prepared from chitosan abundant in nature.Firstly,three dimensional ordered macroporous chitosan（3D-CTS）was prepared with branched chitosan to improve mass transfer of adsorbent,as follows:polystyrene（PS）spheres were prepared with soap-free emulsion polymerization,assembled into opal template with centrifugation method.Then branched chitosan was infiltrated as precursor into the template with liquid-phase infiltration.The infiltrated template was dried under vacuum then was removed with methylbenzene,3D-CTS was consturcted consequently.The adsorption capacity of this adsorbent for various metal ions were studied.Cu/3D-CTS was prepared by loading Cu²⁺onto the 3D-CTSwith static adsorption method.Then Cu/3D-CTS was applied for chlorobenzene removal by relay adsorption.Secondly,in order to improve hydrophobicity of 3D-CTS to strengthen CB adsorption effectiveness,β-cyclodextrin was polymerized with chitosan empolying glutaraldehyde as cross-linker,and three dimensinal ordered macroporous chitosan-β-cyclodextrin（3D-CTS-CD）was resulted out simultaneously.Then adsorption performances of 3D-CTS-CD for chlorobenzene was also studied.Scanning electron microscope was adopted to character macropore structures,and the results showed that the macropores of these material are organized and connected well.Fourier transform infrared spectroscopy,X-ray diffraction,thermal gravity analysis were also adopted to character these materials.In a series of adsorption experiments,the adsorption resluts demonstrated that the adsorption capacity of Cu/3D-CTS for 100 mg/L chlorobenzene was 20.91 mg/g and the removal rate for 10 mg/L reached to 80%.The adsorption capacity of 3D-CTS-CD for 100 mg/L chlorobenzene was 22.6 mg/g..In addition,it was also proved that three dimensional ordered macroporous structure can improve mass transfer.Various conditions having influnce on chlorobenzene’s adsorption were studied as well as adsorption kinetics and adsorption thermodynamics.