Preparation Of Activated Carbons By Waste MTBE Etherified Resins And Research On Adsorption Properties

In this paper,activated carbons were prepared from waste MTBE etherified resins and used to adsorb methylene blue in wastewater.The pHysical and chemical properties of activated carbons and adsorption mechanism were characterized by XPS?FTIR?BET?SEM?TG-DSC as well as other technologies.studies had shown activated carbon(KAC)activated by KOH had an excellent adsorption on methylene blue,the adsorption capacity of Langmuir monolayer reached 478.5 mg/g,and the adsorption process conforms to the second-order kinetic model which indicated that the adsorption process was controlled by the chemical adsorption process.The negatively charged oxygen-containing functional groups on the surface of KAC under alkaline conditions formed chemical bonds with positively charged methylene blue molecules.In addition,the oxygen-containing functional groups on the surface of activated carbon reacted with methylene blue molecules to form amides.Thermodynamic studies had found that the adsorption process was spontaneous and endothermic,and the adsorption enthalpy was 41.16 kJ/mol.At the same time,the synthesized activated carbon was also used to adsorb and remove sulfides from LPG.The study found that activated carbon modified with copper nitrate could greatly improve its desulfurization performance,because Cu2+ could form S-M(?)bond with thioether and reacted with thiol to form thiolate.The desulfurization performance of activated carbon was proportional to its specific surface area,and the optimal reaction temperature was 30?.The optimum loading of copper ions was 10%wt and the optimal roasting temperature of copper nitrate-modified activated carbon was 400?.XPS analysis found that some of the Cu(?)self-reduced to Cu(?)after roasting under nitrogen which could provide more active sites than Cu(?)Active sites,which improves desulfurization performance.The DMDS-TPD results showed that the activated carbon was more strongly bound to dimethyl disulfide after being modified by copper ions.The kinetic study found that the adsorption of dimethyl disulfide by Cu(?)-AC Adsorbent conformed to the pseudo-second-order kinetic model.The thermodynamic study found that the adsorption process was mainly based on monomolecular layer adsorption as well as bimolecular layer adsorption and the Langmuir single layer adsorption was 34.96(mg-S/g).The adsorption process was a non-spontaneous exothermic reaction,and the reaction heat was-17.00 kJ/mol.Cu(?)-AC Adsorbent had good regeneration performance.Four regenerations could still remove 60%of the sulfide.The best regeneration condition was regeneration under nitrogen atmospHere at 400? for 2 h.