改性蔗渣焚烧灰对废水中硫酸盐的吸附性能  

Adsorption Characteristics of Modified Bagasse Ash to Sulfate in the Wastewater

作　　者：牛耿[1,2] 廖雷 师杰峰[3] NIU Geng;LIAO Lei;SHI Jiefeng(College of Environmental Science and Engineering,Guilin University of Technology Guilin,Guangxi 541006)

机构地区：[1]桂林理工大学环境科学与工程学院,广西桂林541006 [2]广西危险废物处置产业化人才小高地,广西桂林541004 [3]广东华锋碧江环保科技有限公司,广东肇庆526100

出　　处：《工业安全与环保》2018年第9期20-24,共5页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(51468011);广西科技攻关计划项目(桂科攻1355003-7)

摘　　要：以改性蔗渣焚烧灰为吸附材料,通过吸附实验研究其吸附去除硫酸盐的吸附机理。利用伪一级和伪二级动力学模型以及内扩散模型,对吸附动力学实验结果进行分析。结果表明,改性蔗渣焚烧灰吸附去除硫酸盐较符合伪二级动力学特征,整个吸附反应的吸附速率主要由颗粒内扩散决定;用Langmuir和Freundlich等温模型分析实验数据发现,Langmuir模型更好地描述改性蔗渣焚烧灰对硫酸盐的吸附过程;用Van’t Hoff方程式计算吸附过程热力学参数ΔH和ΔS均为正值,ΔG为负值,说明该吸附反应是自发的、吸热的,且是反应过程中体系混乱度增加的反应。The adsorption characteristics of bagasse ash to sulphate are evaluated.Adsorption kinetics data are also tested using pseudo-first-order,pseudo-second-order and intraparticle diffusion models.It shows that the modified bagasse ash removal of sulfate is in line with the pseudo-second-order reaction and the adsorption rate is mainly controlled by particle diffusion.The Langmuir and Freundlich isothermal models show that the Langmuir model can better describe the adsorption process of modified bagasse ash to sulfate.Van’t Hoff equation is used to calculate the adsorption thermodynamics parameters,and the results show thatΔH andΔS are positive andΔG is negative,meaning that the adsorption process is spontaneous,endothermic and it is also a reaction that the degree of system confusion is increased.

关 键 词：改性蔗渣焚烧灰 硫酸盐 吸附动力学 吸附等温线 吸附热力学 

分 类 号：X703[环境科学与工程—环境工程]