油樟叶渣活性炭对磺胺嘧啶的吸附性能

Adsorption Performance of Cinnamomum Longipaniculatum Activated Carbon toward Sulfadiazine

以油樟叶渣活性炭为吸附剂,研究活性炭投加量、吸附时间、不同初始质量浓度、吸附温度、pH值等因素对水中磺胺嘧啶吸附性能的影响,采用傅里叶红外光谱分析(FTIR)和比表面积仪(BET)对活性炭进行表征。结果表明,磺胺嘧啶初始质量浓度为20 mg/L时,投加700 mg油樟叶渣活性炭,磺胺嘧啶去除率达到54.4%,吸附时间越长,吸附效果越好,1440 min后达到吸附平衡;去除率随pH值升高不断降低,酸性环境有利于吸附磺胺嘧啶;吸附容量随温度的升高而增加,但温度超过35℃后,吸附性能下降;Langmuir和Freundlich吸附等温拟合结果表明,吸附过程为单分子层吸附;准二级动力学模型和Weber-Morris粒子内扩散方程分析结果表明,吸附过程包括物理吸附和化学吸附,以化学吸附为主,吸附速率受颗粒内扩散和外表面扩散控制。

The cinnamomum longipaniculatum activated carbon from leaf residues of cinnamomum longipaniculatum was characterized with fourier transform infrared spectroscopy(FTIR)and Brunner-Emmet-Teller(BET)measurements.The effects of the dosage of activated carbon,adsorption time,initial concentration,temperature and pH on the removal of sulfadiazine in water were investigated.The results showed that the removal rate reached 54.4%with the initial concentration of sulfadiazine of 20 mg/L and 700 mg activated carbon.Adsorption performance was improved with adsorption time,and adsorption equilibrium was achieved after 1440 min.Removal rate showed a decreasing trend with increased pH,indicating that acidic environment was conducive to the adsorption toward sulfadiazine.Adsorption capacity rose with elevated temperature and then fell above 35℃.The adsorption fitted well to the quasi-second-order kinetics equation,Weber-Morris intraparticle difussion model,Langmuir and Freundlich adsorption isotherm models,demonstrating that the adsorption was monolayer adsorption,and that the adsorption rate was mainly controlled by both internal particle difussion and surface adsorption.