Mechanochemical Synthesis Of Porous Polymers And Adsorption Of Water Contaminants

In rencent years,pharmaceuticals and personal care products and so on water contaminants largely appears in industrial wastewater,which caused huge pollutants to water environment.Industrials wastewater enter into natural water system,which will bring great harm to human body and aquatic organism.Organic pollutants receive more and more attention due to their characteristic of mutagenesis,carcinogenic,inheritance and so on.Usually,high concentration industrial wastewater were treated by activated-sludge method,microbial degradation method,ozonation method,photodegradation method and so on before charge.But above methods exist defects of high cost,difficult operating,incomplete treatment,easily caused secondary contaminants and so on.To remove low concentration organic contaminants in wastewater and drinking water requires rapid and effective treatment.Compared with above methods,adsorption has the advantage of low cost,high removal efficiency,easy to operating and so on in treating with wastewater containing low concentration organic wastewater.Highly efficient preparing adsorbents with superior adsorption properties is the key of adsorption method face the problem of removal organic contaminants in water.Nowadays,there developed a great variety of adsorbents,such as porous carbon,metallic oxide,metal-organic compounds,porous organic polymers and so on.Among them,porous organic polymers have great potential in application field of contaminants adsorption due to their abundant functional groups,adjustable porous structure,various synthetic pathways as well as the possibility of mass preparation.Solvothermal method is the common method to prepare porous organic polymers,while it exist defects of organic solvent loss,long reaction time,many by-products,low yield rate and so on.Mechanochemistry abandon the using of organic solvent as well as safe and efficient reaction,which is a synthesis method fitting the principle of green chemistry.This paper takesβ-cyclodextrin（β-CD）and hexachlorophosphazene（HCCP）as monomer to prepare series of cyclodextrin polyurethane porous polymers（CDPUs）and polymerized phosphonitrile-based porous polymers by mechanochemistry.Analyzed the characteristic of chemical structure,morphology and porosity by various characterization.At the same time,studied the removal property of two kinds of polymers for adsorption on phenols and phenothiazines organic contaminants and cleared the mechanism of adsorption.The main research contents and results in this paper are as follows:1,The study onβ-cyclodextrin polyurethane porous polymers prepared by mechanochemistry and adsorption removal of bisphenols contaminants in water.Takingβ-cyclodextrin as monomer and various diisocyanates as linkers to prepare series ofβ-cyclodextrin polyurethane porous polymers（CDPUs）by solid-state mechanochemistry in the conditions of room temperature,in a short time（<2 h）and without any organic solvents and catalysis.This mechanochemistry synthesis method can also extend to prepare CDPUs-based composites for special separation such as magnetic separation.CDPUs can successfully as adsorption for adsorbing phenols contaminants due to their lots of adsorption active sites containing the cavities ofβ-CD,bridging amino,dissociated amino and benzene ring.The adsorption capacity of bisphenol A can reach up to 105.34 mg g^-1.This kind of porous polymers have the advantages of fast adsorption speed,high adsorption capacity for phenol contaminants.The mechanism of this action can attribute to the synergistic effect of“host-guest”recognition,hydrogen bond andπ-πelectron donor acceptor interaction.This work provides a new idea for rational designing organic porous polymers adsorbent and its sustainable using for controlling water contaminants adsorption.2,The study on polymerized phosphonitrile-based porous polymers prepared by mechanochemistry and adsorption removal of phenothiazines contaminants in water.Taking hexachlorophosphazene as monomer and various phenols as linkers to prepare series of polymerized phosphonitrile-based porous polymers by solid-state mechanochemistry in the conditions of room temperature,in a short time（<3 h）and without any organic solvents and catalysis.Polymerized phosphonitrile-based porous polymers can successfully as adsorption for adsorbing phenothiazines contaminants due to their lots of adsorption active sites containing phosphorus nitrogen bond,bridging phosphorus oxygen bond and benzene ring.The adsorption capacity of promethazine hydrochloride can reach up to 319.52 mg g^-1.This kind of porous polymers have the advantages of fast adsorption speed,high adsorption capacity for phenothiazines contaminants.The mechanism of this action can attribute to the synergistic effect of electronic interaction,hydrogen bond andπ-πelectron donor acceptor interaction.This work provides a new idea for rational designing organic porous polymers adsorbent and its sustainable using for controlling water contaminants adsorption.