双酚A在黄河兰州段沉积物上的吸附行为研究  

Behavior of Adsorption of Bisphenol A on Sediments of Yellow River’s Lanzhou Section

作　　者：吴嘉丽 苏宏伟 蒋煜峰[1] 张晓珍 何蕊 刘哲炜 WU Jiai;SU Hongwei;JIANG Yufeng;ZHANG Xiaozhen;HE Rui;LIU Zhewei(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《环境科学与技术》2024年第4期133-139,共7页Environmental Science & Technology

基　　金：国家自然科学基金项目:西北地区天然有机肥黄土改良对典型有机污染物环境行为影响及潜在风险研究(21966020)。

摘　　要：为研究典型环境激素类污染物在黄河上游沉积物上的吸附行为,文章选用黄河兰州段沉积物为研究对象,双酚A(BPA)为代表性污染物。采用批平衡实验法研究了BPA在黄河沉积物上的吸附动力学、吸附等温线以及沉积物粒径、pH对吸附过程的影响。结果表明,准二级动力学模型能更好地拟合BPA在黄河兰州段沉积物上的吸附动力学过程(R^(2)=0.999),且分为快、慢和吸附平衡3个阶段,10 h左右达到吸附平衡;Freundlich模型对BPA在沉积物上的吸附等温线拟合度更高(R^(2)≥0.986)。25~45℃温度范围内吉布斯自由能ΔG^(θ)和焓变ΔH^(θ)均<0,熵变ΔS^(θ)>0,表明吸附为自发进行的放热过程,且吸附过程体系的混乱度增加。沉积物粒径越小,对BPA的吸附能力越强;pH对吸附的影响表现为酸性促进而碱性抑制。For the purpose of researching the adsorption behavior of environmental hormones typically contained in the sedi-ments of the upper-reach of the Yellow River,the sediments of Lanzhou section of the Yellow River were selected as a re-search object with BPA(bisphenol A)as the representative environmental hormone.The adsorption kinetics and adsorption isotherm process of BPA in the River’s sediments,as well as the effects of sediment particle size and pH value on the adsorp-tion process,were studied by the batch equilibrium test.Consequently,it was showed that the quasi-second-order kinetic model could better fit the adsorption kinetic process of BPA in the sediments of the Yellow River(R^(2)=0.999),the adsorption process being gradually in three stages:fast adsorption,slow adsorption and adsorption equilibrium,and it took 10 hours all so to reach adsorption equilibrium;and the Freundlich isotherm adsorption model fit the adsorption isotherm process of BPA on the sediments the best(R^(2)≥0.986).Within the temperature range of 25~45℃,both of Gibbs free energyΔG^(θ)and enthalpy changeΔH^(θ)were<0,entropy changeΔS^(θ)being>0,which indicated that the adsorption of BPA onto the River’s sediments was a spontaneous exothermic process,and the disorder degree of the adsorption process system intensified;the smaller sedi-ments particle size,the stronger the adsorption of BPA on the sediments;and as to the effects of pH value on the adsorption,it was showed that acidity boosted the adsorption,while alkality inhibited it.

关 键 词：黄河沉积物 双酚A 吸附动力学 吸附等温线 影响因素 

分 类 号：X703[环境科学与工程—环境工程]