Surface Molecularly Imprinted Polymers Based On Porous Carbon Nanospheres For Phenol And Quinoline Removal

Coking wastewaters always have complex composition,high concentration and high toxicity,which have caused serious environmental problems and long-term harm to aquatic ecology and human health.The problems need to be urgently resolved.Phenol and quinoline are typical hard-to-degrade organic compounds in coking wastewater,with high content,large proportion and carcinogenic effects.Both phenol and quinoline are highly toxic and difficult to degrade,bringing great toxicity to coking wastewater.And the improper handling can cause harmful risks to the environment and human health.On the other hand,the recovery of the two compounds has great economic value.Therefore,aiming at the problem that organic pollutant molecules mentioned above are difficult to be selectively removed from coking wastewater,we use surface molecularly imprinted polymers(SMIP)with predetermination,specific recognition and wide applicability to solve the problem.The main research contents are as follows:(1)Preparation and performance test of phenol SMIP prepared using two functional polymersThrough the optimization of functional monomers and solvents,acrylamide(Am)was used as the functional monomer,acrylamide-2-methylpropanesulfonic acid(AMPS)as the hydrophilic functional monomer,and chloroform as the solvent.With PCMSs as the carrier,ethylene glycol dimethacrylate(EGDMA)as the cross-linking agent,and azobisisobutyronitrile(AIBN)as the initiator,hydrophilic surface molecularly imprinted polymers(AMPS-Am/MIP)were prepared to selectively adsorb phenol from coking wastewater.The surface morphology,functional group,thermal stability and hydrophilicity of AMPS-Am/MIP were investigated,and the adsorption properties including kinetic,isothermal,adsorption selectivity and regeneration were tested in detail.The results show that the adsorption of AMPS-Am/MIP towards phenol reaches equilibrium in 180 min and the adsorption capacity is 86.65 mg g^-1,its relative selection factor is up to1.89 and the material exhibits a retention of 80%of its capacity after 5times of adsorption-regeneration cycles,which suggests that AMPS-Am/MIP has good adsorption properties.When p H value is around 8(close to coking wastewater),the adsorption capacity maintains at 46.84 mg g^-1.(2)Preparation and performance test of quinoline SMIP with adsorption selectivityThrough the optimization of functional monomers and solvents,?-methacrylic acid(MAA)was used as the functional monomer,chloroform as the solvent,PCMSs as the carrier,EGDMA as the cross-linking agent,and AIBN as the initiator,surface molecularly imprinted polymers(MAA/MIP)were prepared to selectively adsorb quinoline from coking wastewater.The surface morphology,functional group,thermal stability and hydrophilicity of MAA/MIP were investigated,and the adsorption properties including kinetic,isothermal,adsorption selectivity and regeneration were tested in detail.The results show the good adsorption properties of MAA/MIP:the adsorption of MAA/MIP towards phenol reaches equilibrium in 150 min and the adsorption capacity is 86.65 mg g^-1,its relative selection factor is up to1.89 and the material can be uesed for 5 times of adsorption-regeneration cycles without substantial capacity loss.The adsorption capacity maintains at 87.52 mg g^-1when p H value is around 8,indicating the applicability and high efficiency of MAA/MIP in alkalescent coking wastewater treatment.