Study On Preparation Of Porous Carbon Materials And Its Adsorption Performance For Wastewater Antibiotics

In recent years,the problem of water pollution caused by the abuse of antibiotics has received extensive attention.Compared with the chemical and biological method,the adsorption method has the advantages of simple operation,low cost and high adsorption capacity,which has been widely used in the treatment of residual antibiotics in waste water.Porous carbon materials have shown potential application prospects in adsorption,drug loading,drug delivery and release,and catalysis because of their large specific surface area,abundant pore structure and high chemical stability.In this work,porous carbon materials with different morphologies have been prepared which served as adsorbing material,and its application performance in antibiotic adsorption is studied.The main research contents are as follows:(1)Three-dimensional structural porous carbon was prepared by using waste polystyrene(PS)plastic as carbon source.Since PS is easily decomposed completely at high temperatures and has no carbon remains.Therefore,the polymerization degree of PS is increased by cross-linking in our work.Under the catalysis of the aluminum chloride,the crosslinking reaction was carried out with carbon tetrachloride as dissolving agent and crosslinking agent,and silica particle was added to create rich pore structure simultaneously.Finally,adsorption performance and recycling performance of carbon material were explored by adsorption kinetics and adsorption isotherms.(2)The large carbon nanocage was prepared by using waste plastic polyethylene(PE)as carbon source.The PE and magnesium powders are firstly mixed,then the carbon nanocage was obtained by pyrolyzing at different temperatures and removing the template.The sample carbonized at 600°C exhibited high specific surface area of 1434 m~2/g and uniform pore size distribution.Finally,we explored the adsorption properties of carbonized samples at different temperatures.(3)The tubular porous composite carbon material was prepared with carbon nanotube(CNT)as template and m-aminophenol resin as carbon source.Under the catalysis of ammonia,cetyltrimethylammonium bromide(CTAB)serving as modifier and dispersant promoted coating of m-aminophenol resin on the outside of CNT.Rapid polymerization of3-AF resin in a short time led to the compositional inhomogeneity of resin.Then the CNT composite coated with a thin porous carbon was obtained by dissolution of soluble resin in acetone and carbonization.Finally,the adsorption properties of material on cephalexin were investigated.The adsorption performance and application prospects were further analyzed by adsorption kinetics and adsorption isotherms.(4)Carbon spheres with different internal structure were prepared controllably by the dissolution protection strategy which the resorcinol/formaldehyde(RF)resin sphere was used as carbon source and template.Under the catalysis of ammonia,the resorcinol monomer and formaldehyde were rapidly polymerized forming the RF resin sphere with uneven internal components.The oligomer resin was dissolved by acetone,and then co-assembled with cetyltrimethylammonium bromide(CTAB)forming a dense shell on the outside of RF resin,which prevented the internal resin from being further dissolved.The core-shell,yolk-shell and hollow carbon spheres were prepared controllably by adjusting the amount of acetone.Finally,we studied the adsorption performance of carbon spheres with different structures on cephalexin in water,and the hollow spheres showed better adsorption performance.