摘要
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.
Abstract
The cinnamomum longipaniculatum activated carbon from leaf residues of cinnamomum longipaniculatum was characterized with fou-rier 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 mod-el,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.
基金项目
香料植物资源开发与利用四川省高等学校重点实验室开放基金(21XLY01)
四川省省级大创项目(S202110641087)
四川省省级大创项目(S202310641088)
国家科技期刊平台
NSTL
万方数据