摘要
采用化学共沉淀法制备了磁性粉煤灰,并对其吸附环丙沙星(Ciprofloxacin, CIP)的行为进行吸附动力学,吸附等温线及吸附热力学研究。结果表明:磁性粉煤灰对CIP具有较好的吸附性能,吸附过程较符合准二级吸附动力学方程(R2>0.99),颗粒内扩散过程不是吸附速率的唯一控制步骤,吸附过程同时受到外层颗粒扩散过程的控制;Freundlich吸附等温方程更能准确地描述磁性粉煤灰对CIP的吸附热力学行为,表明磁性粉煤灰对CIP的吸附属于非均匀的多分子层吸附。在研究的温度范围内,△G^(θ)<0、△H^(θ)>0、△S^(θ)<0,表明吸附行为是自发进行的吸热反应,并且在整个吸附过程中系统的紊乱度减小。
Magnetic fly ash was prepared by chemical coprecipitation method,and the adsorption kinetics,adsorption isotherm and adsorption thermodynamics for Ciprofloxacin(CIP)were studied.The results showed that magnetic fly ash had good adsorption performance for CIP,and the adsorption process was more in line with the pseudo-second-order adsorption kinetics equation(R 2>0.99).The intraparticle diffusion process was not the only control step of the adsorption rate,but also controlled by the diffusion process of outer particles.Freundlich adsorption isotherm equation can more accurately describe the thermodynamic behavior of CIP adsorption by magnetic fly ash,indicating that the CIP adsorption by magnetic fly ash belonged to non-uniform multi-molecular layer adsorption.In the studied temperature range,△G^(θ)、△H^(θ)and△S^(θ)were all less than 0.The CIP adsorption behavior by magnetic fly ash was a spontaneous endothermic reaction,and the disorder degree of the system decreased in the whole adsorption process.
作者
黄彩云
张双圣
周俊杰
Huang Caiyun;Zhang Shuangsheng;Zhou Junjie(School of Environmental Engineering,Xuzhou University of Technology,Xuzhou 221018,China)
出处
《山东化工》
CAS
2023年第6期47-49,57,共4页
Shandong Chemical Industry
基金
徐州工程学院大学生创新创业基金项目(xcx2021040)
徐州工程学院大学生创新创业基金项目(xcx2022081)
徐州工程学院大学生创新创业基金项目(2020022)。
关键词
粉煤灰
磁性
化学共沉淀法
环丙沙星
吸附动力学
吸附热力学
fly ash
magnetism
chemical co-precipitation
ciprofloxacin
adsorption kinetics
adsorption thermodynamics
作者简介
黄彩云,女,在读本科生,研究方向为污废水的处理处置;通信作者:张双圣,博士,副教授,研究方向为水污染控制。
