功能化多孔碳的制备及其对芳烃的吸附

Preparation of sulfhydryl modified porous carbon and its adsorption of aromatic hydrocarbons

液体石蜡油是重要的化工原料,但其芳香烃杂质会严重影响下游产品质量.以木质素磺酸钠为基体,ZnCl_(2)为活化剂,用后接枝法引入巯基官能团,再在管式炉中通入氮气进行高温碳化,制备了多孔碳材料(PSC)并研究了其对典型芳香族杂质的吸附.结果表明:不同处理条件(微波、超声波、蓝光)下,对液体石蜡中萘的吸附都产生显著影响,其中比表面积从1177.57 m^(2)‧g^(-1)至1775.42 m^(2)‧g^(-1)不等,最大吸附量达702.28 mg‧g^(-1).同时,虽引入巯基的多孔碳材料(PSC-SH)与未引入巯基的多孔碳材料(PSC)的比表面积和孔容差距不大,但PSC-SH对萘的吸附量是PSC的2.07倍,是因巯基的引入使得样品的活性位点增加,增加了对萘的吸附量.

Liquid paraffin is an important chemical raw material,but its aromatic hydrocarbon impurities greatly affect the quality of downstream products.Using sodium lignosulfonate as the matrix and ZnCl_(2)as the activator,a sulfhydryl modified porous carbon material(PSC)was prepared by post grafting followed by carbonation in a tube furnace under high temperature and nitrogen protection,and its adsorption for typical aromatic impurities was investigated.The results revealed the processing conditions(microwave treatment,ultrasonication,and blue light irradiation)had significant effect on its adsorption of naphthalene in liquid paraffin,of which the specific surface area varied from 1177.57 m^(2)‧g^(-1)to 1775.42 m^(2)‧g^(-1)and the maximum adsorption reached 702.28 mg‧g^(-1).It was also found that with or without sulfhydryl groups,the difference in specific surface area and pore volume between the PSCs(PSC-SH vs PSC)was not significant,but the adsorption capacity of PSC-SH for naphthalene was 2.07 times as much as that of PSC,suggesting that introduction of sulfhydryl groups greatly increased the active sites of the sample for the adsorption of naphthalene.