烟梗基多孔炭的制备及其磺胺二甲基嘧啶吸附性能研究

Preparation of hierarchically porous carbons from tobacco stems and study on their adsorption of sulfamethazine

磺胺二甲基嘧啶(SMZ)的大量使用会对生态环境产生不利影响,并导致耐药菌的产生,对人类健康构成重大风险。以烟梗为原料的生物炭具有价格低廉、绿色环保等优势,可用于SMZ的吸附。本文以草酸钾与碳酸钙为二元活化剂,制备了性能优异的多孔炭材料(TS-PC-800),具有最大的平衡吸附容量(852.4 mg/g)。当SMZ溶液pH为;3-6时,多孔炭具有良好的吸附性能,当pH为7-9时,其吸附性能显著下降。等温吸附实验和吸附动力学研究结果表明,TS-PC-800对SMZ的吸附符合Langmuir模型,吸附过程符合伪二阶动力学模型。在T=318 K,SMZ溶液初始浓度C_(0)=200 mg/L时,其理论饱和吸附量Q_(m)=1121 mg/g,且10 min左右能快速达到吸附平衡。循环实验表明TS-PC-800具有良好的稳定性和再生性能,经过4次循环,吸附量仍可达781 mg/g。

The large-scale use of sulfamethazine(SMZ)has adverse effects on the ecological environment,and will also lead to the production of drug-resistant bacteria and pose a major risk to human health.Biochar with tobacco stems as a raw material has the advantages of wide sources and low price,and can be used for the adsorption of SMZ.In this paper,K_(2)C_(2)O_(4)and CaCO_(3)are used as double activators to prepare a porous carbon material(TS-PC-80O)with excellent performance,which has the largest equilibrium ad-sorption capacity(852.4 mg/g).When the pH of the SMZ solution is 3-6,the porous carbon has good adsorption performance,and when the pH is 7-9,its adsorption performance decreases significantly.The results of adsorption isotherm experiments and adsorption kinetics show that the adsorption of SMZ by TS-PC-800 conforms to the Langmuir model,and the adsorption process conforms to the pseudo-second-order kinetic model.When T=318 K and the initial concentration of SMZ solution C_(o)=200 mg/L,its theoretical sat-urated adsorption capacity Q_(m)=1121 mg/g,and the adsorption equilibrium can be quickly reached in about 10 minutes.Cycle ex-periments show that TS-PC-800 has good stability and regeneration performance.After 4 cycles,the adsorption capacity can stil reach 781 mg/g.