Synthesis Of Thiol Group Supercrosslinked Polymers And Their Mercury Adsorption Properties

Water is a natural resource closely related to human life and health,and untreated mercury-containing wastewater discharged into the ecological water environment will cause incalculable damage to aquatic organisms and human health.Therefore,the removal of mercury ions from mercury-containing wastewater is of vital importance for environmental protection.Among the many methods for mercury-containing wastewater treatment,adsorption is considered as one of the practical technologies due to many advantages,and the development of efficient mercury adsorbents has been a hot research topic in this field.With high specific surface area,rich pore structure and many excellent physicochemical properties,supercrosslinked polymers(HCPs)have a great potential in the field of efficient mercury adsorbent materials.In this thesis,two efficient mercury adsorption materials were prepared by group modification methods and composite strategies,and their structures,morphologies and mercury adsorption properties were investigated by BET,FT-IR,SEM and ICP tests.Based on the soft and hard acid-base theory,a stable coordination bond can be formed between sulfhydryl groups and mercury ions,thus achieving efficient removal of mercury ions.In this paper,HCPs(HCP-DS)were prepared using Friedel-Crafts reaction,and HCPs containing a large number of sulfhydryl groups(HCP-SH)were obtained after their reduction treatment with them as precursors.The structure and morphology of the prepared HCP-SH were characterized,and the adsorption properties of HCP-SH on mercury ions were investigated under different adsorption conditions.The results showed that HCP-SH contained a large amount of sulfhydryl groups after reduction treatment and exhibited excellent adsorption capacity for mercury ions.Optimizing the adsorption conditions,the mercury adsorption capacity of HCP-SH can reach up to 2200.8 mg/g.The selective removal of mercury ions by HCP-SH can reach 81.9% in the presence of multiple competing ions.xps results indicate that the sulfhydryl group in HCP-SH plays an important role in the adsorption of mercury ionsIn order to make the adsorbent material more convenient to separate from the mercurycontaining solution and enhance its application capability,HCP/E-51-SH composites were prepared by heating and curing method and reduction treatment method in this paper using bisphenol A epoxy resin E51 as the matrix material in order to obtain HCP/E-51-SH composites.The structure and morphology of the prepared HCP/E-51-SH composites were investigated,as well as the adsorption performance of mercury ions under different adsorption conditions.The results show that the HCP/E-51-SH composites have excellent macrostructure and stability as well as good selective mercury adsorption ability.The selective removal of mercury ions by HCP/E-51-SH composites could reach 58.2% in the presence of multiple competing ions.the XPS results showed that the selectivity of HCP/E-51-SH composites for the adsorption of mercury ions was mainly attributed to the mercapto active groups.