Preparation And Modification Of Mesoporous Carbon For Phenolic Compounds Adsorption In Water

Environmental endocrine disruptors,which are a kind of external interference of endocrine chemical substances,interfere with human and animal endocrine system,immune system,nervous system,produce abnormal phenomena,and even seriously affect the reproductive and genetic function.When the environmental endocrine disruptors are discharged into the water with sewage,they are difficult to be degraded,thus an efficient treatment method need to be find to solve the problem.The most extensively used method is adsorption.Therefore,it is imperative to develop effective adsorbents.The purpose of this paper is to synthesize a kind of adsorbent with superior performance on adsorption and regeneration,for researching the adsorption on bisphenol A（BPA）and nonylphenol ethoxylates(NPEO₁₀).The content consists of the following:（1）The mesoporous carbon（MC）was prepared in soft template,F127 as the template,and modified by melamine to obtain N-modified mesoporous carbon（NMC）,their textural properties were characterized,respectively.（2）The adsorption properties of NPEO₁₀0 and BPA were investigated by using mesoporous carbon materials and compared with activated carbon.Tested the effects of the concentration of adsorbate,the dosage of adsorbent and the pH value of solution on the adsorption process,and analyzed the kinetics,isotherm and regeneration performance of the adsorbents.（3）The effect of adsorbate concentration,influent flow rate and adsorption column height on the dynamic adsorption performance with N-modified mesoporous carbon as adsorbent were studied.The conclusions obtained from the experiment are as follows:（1）The specific surface area of the unfunctioned mesoporous carbon was larger than that of the nitrogen functionalized mesoporous carbon,which were 687.76 m²/g and 579.59 m²/g,and the pore size were 4.06 nm and 4.00 nm,respectively.（2）The adsorption properties of mesoporous carbon and N-modified mesoporous carbon for NPEO₁₀ and BPA were as follows:the equilibrium adsorption capacity was positively correlated with the initial concentration,negatively correlated with the dosage of adsorbent,and the acidic condition was favorable for the adsorption.The adsorption capacity of NMC to NPEO₁₀ and BPA was better than that of MC.Under the same conditions,the adsorption capacity of MC and NMC to NPEO₁₀ was higher than that of BPA.（3）The adsorption kinetics of NPEO₁₀ and BPA on MC and NMC were in accordance with the pseudo-second order kinetic model.The adsorption rate of NPEO₁₀ on NMC was the highest,which was 2.5 times of that of MC and 22.8 times of AC,and the adsorption rate of BPA was in the order of NMC>AC>MC.（4）The adsorption isotherms of NPEO₁₀ and BPA were better fitted by Frenudlich equation for MC and NMC,respectively.The adsorption of NPEO₁₀ and BPA were concluded to be a favorable adsorption,an exothermal and spontaneous process,and based mainly physical adsorption without bond of strong action,such as chemical bond.（5）Extraction of the adsorption saturation mesoporous carbon materials MC and NMC by NPEO₁₀ and BPA were carried out by 75%ethanol solvent extraction.The removal rate of NMC and MC after 5 times in a cycle of adsorption was more than 60%,the regeneration performance is higher than activated carbon（AC）.（6）The NMC was used to study the dynamic adsorption properties of BPA and NPEO₁₀in the adsorption column.The adsorption breakthrough curve increased with the increase of influent concentration or the influent flow rate,moved right gradually.The adsorption breakthrough time and adsorption saturation time were shortened.With the adsorbent bed height increases,the conclusion was just the opposite.