Technology And Mechanism Of PPCPs Removal:Based On Functional Groups Regulation Of Polymeric Adsorbent

Drugs which taken by animals may partly enter natural waters through metabolism.Personal care products,such as sunscreen and facial cleanser,will flow into natural waters through a sewage treatment plant by washing.However,the above actions can not be completely avoided and prohibited.The drugs and personal care products(PPCPs)will do harm to human beings or have potential hazards because of its bioaccumulation and bioactivity.Therefore,this paper discussed the removal of typical PPCPs(drugs:Norfloxacin,Tylosin,Diclofenac sodium;personal care products:Benzophenone-4)which have been frequently detected in water by several polymer materials.The potential application of macromolecule adsorbents in removing typical PPCPs in water was discussed from two aspects(synthetic macromolecule materials(resin DMA)and biological composite materials(MCPs)).Zeta potential and surface morphology of macromolecule adsorbent were investigated.The anti-pH,anti-humic acid,anti-salt ion and reusability of the adsorbents were studied.The adsorption mechanism was further investigated by adsorption kinetics,adsorption thermodynamics and DFT calculation.The results show that:(1)In this work,a series of novel tertiary amine-functionalized crosslinking polymeric resins,synthesized using different proportions of raw materials,were employed for the adsorption of Benzophenone-4.During the synthesis process,a facile one-step fabrication method,following the concept of cleaner production,was established for the reduction of unnecessary derivatization steps,extra pollution,costs and time.Among these tertiary amine-functionalized resins,the optimal one with relatively larger pore diameter,larger specific surface area,and fewer inner defects,exhibited the highest adsorption capacity of 154 mg/g.Such a value was notably larger than several frequently reported commercial adsorbents.The performance of the resin not only owned strong resistance against influences of coexisting natural organic matter and inorganic ions,but also bore reuse without much capacity loss after adsorption-desorption cycles.The adsorption process is monolayer adsorption,and the adsorption experimental data are more followed pseudo-second-order kinetic equation.Adsorption interfacial interactions were studied,via both experimental analyses and chemical calculations.Electrostatic attraction played a leading role during adsorption.(2)The prepared natural polymer composite MCPs have core-brush structure,and a large number of functional groups in the graft chain increase the adsorbent's affinity to pollutants.For norfloxacin and tylosin,modified CS-MCP with polyanions(poly(sodium p-styrenesulfonate))branches exhibited high Qe(165 mg/g and 134 mg/g,respectively);whereas for DCF,modified MCP with polycations(poly(p-vinylbenzyl trimethylammonium chloride))branches is favored(151 mg/g).Considerable resistance against coexisting pharmaceuticals and inorganic ions,as well as reusability,of the adsorbents,were found.Physico-chemical analyses,instrumental characterizations and theoretical calculations demonstrated that electrostatic attraction and ?-? interactions contributed to adsorption.