Preparation of water insoluble β-cyclodextrin-co-thiourea polymer and its application as a new absorbent for removal Lead (II) ions from Wastewater

A novel insoluble β-cyclodextrin-thiourea (β-CD-TU) polymer was synthesized from reacting thiourea with nanoporous β-cyclodextrin and epichlorohydrin. The structure of this polymer was characterized by fourier transform infrared (FT-IR), scanning electron microscope (SEM), thermal gravimetric analysis (TGA) and elemental analyses (CHNS). The prepared porous co-polymer was used as very attractive and effective adsorbents for the removal of heavy metal ions such as lead(II) ions from wastewater. The effect of contact time and initial adsorbent dose on the extent of adsorption was investigated. The equilibrium data obtained by experiments were well analyzed by adsorption isotherms which the results are well fitted with Langmuir model at ambient temperature. A maximum monolayer coverage capacity (qm) 285.126 mg.g-1. More importantly, the adsorption effectiveness of the β-CD-TU remained constant through five regeneration cycles.

Keywords:

β-cyclodextrin-thiourea , Removal of heavy metal ions , Lead (II) ions.