Preparation,Characterization And Adsorpion Properties Of Porous Organic Polymers For Pollutants In Water

Water is the source of life,and clean water quality plays a central role in the survival of all living things on Earth.In recent years,with the continuous growth of population and the subsequent acceleration of industrialization and urbanization,a variety of industrial and agricultural chemicals have been abused in large quantities,resulting in a large amount of pollution of the already scarce water resources,and the global supply of clean water resources has become increasingly tight.Therefore,in order to meet the high global demand for clean water,efficient treatment of water pollutants has become a difficult problem that the scientific community must overcome.Currently,different adsorbents and catalysts have been used to remove contaminants,however,due to a number of related limitations such as poor chemical and physical stability,small specific surface area,and low binding ability,leading researchers to focus on and explore alternative materials.Porous organic polymer is a new kind of porous material with predictable framework structure,which can be designed and synthesized precisely according to the required functions,and has unique properties such as adjustable and uniform pore structure and high specific surface area.It is a new kind of adsorbent for pollutant removal.In this paper,we investigate the design and preparation of functional porous organic polymers for the adsorption of naproxen in water and oil/water separation.The main research contents are as follows:（1）In Chapter 2,because phosphoric acid group,hydroxyl group and N-containing functional group have strong binding force to naproxen molecule,we designed the structure of porous organic polymer material reasonably,using diphenyl phosphate as the reaction monomer,two porous organic polymers LNU-68 and LNU-69 were successfully prepared by Friedel-Crafts reaction with tetraphenylporphyrin and callix[4]aromatics,respectively.They were used as solid adsorbents to remove naproson molecules from water.Due to the excellent pore structure and abundant strong affinity sites,LNU-68 and LNU-69 showed high adsorption capacity and rapid adsorption rate under simulated water environment conditions.The adsorption capacity of the two polymer materials for naproxen was 418 and 231 mg g^-1,respectively,which was higher than that of most other adsorbents,and LNU-68 reached the adsorption equilibrium at 4.5 h.In addition,LNU-68 still maintained high naproxen removal rates（>80%）in the presence of other competing ions and a high concentration of Na Cl.The adsorption capacity of LNU-68 was still above 350 mg g^-1 after 4 repeated cycles.The results show that LNU-68 porous organic polymer containing porphyrin and phosphate structure is a promising solid adsorbent for naproxen removal from water.（2）In Chapter 3,porous organic polymers consisting of high density phenyl units with stable microporous/mesoporous structures and highly hydrophobic surfaces have been widely using in the field of oil/water separation.In this chapter,we synthesized the porous organic polymer LNU-24 with high density phenyl units using 1,3,6,8-tetrabromopyrene and 1,3-diphenyldiborate pinalyl ester as the construction units by C-C connection mode.LNU-24 exhibits abundant porous structure,excellent mechanical stability and high hydrophobicity due to abundant aromatic units in the framework.In addition,LNU-24 can be coated on melamine sponge（MS）,giving the sponge superhydrophobicity,high elasticity,rich porous structure and good chemical stability.The experimental results show that the composite sponge LNU-24@Sponge can maintain its original superhydrophobicity even in the presence of extremely acidic/alkaline conditions（p H=1 and 14）and high concentration of salt.Importantly,LNU-24@Sponge exhibited excellent adsorption capacity for a variety of oils（organic solvents）,up to 61 to 135 times its own weight.In addition,the super hydrophobic LNU-24@Sponge could continuously adsorb and discharge the oil on the water surface through the vacuum way,and the separation efficiency remains basically unchanged after 10 repeats,with excellent cycle stability.It was worth mentioning that LNU-24@Sponge could also demulsifier surfactant stabilized oil-in-water emulsion,with an oil recovery efficiency of about 93%in filtrate.Good stability,excellent adsorption capacity and recyclability make LNU-24@Sponge have broad application prospects in the field of oil spill treatment and environmental remediation.