改性土-膨润土隔离墙对苯酚吸附规律及其微观特性研究  

Study on the Adsorption Law of Modified Soil-bentonite Wall on Phenol and Its Microscopic Characteristics

作　　者：斯小龙 何海杰 邱战洪[1] 徐二佩 赵俭斌[2] 兰吉武 唐文荣 毛忠荣 SI Xiaolong;HE Haijie;QIU Zhanhong;XU Erpei;ZHAO Jianbin;LAN Jiwu;TANG Wenrong;MAO Zhongrong(School of Civil Engineering&Architectural,Taizhou University,Taizhou Zhejiang 318000;School of Architecture and Construction,Shenyang Jianzhu University,Shenyang Liaoning 110168;College of Civil Engineering and Architectural,Zhejiang University,Hangzhou Zhejiang 310013;Shanghai Laogang Waste Disposal Co.Ltd.,Shanghai 201302)

机构地区：[1]台州学院建筑工程学院,浙江台州318000 [2]沈阳建筑大学土木工程学院,辽宁沈阳110168 [3]浙江大学建筑工程学院,浙江杭州310013 [4]上海老港废弃物处置有限公司,上海201302

出　　处：《环境卫生工程》2021年第2期88-94,共7页Environmental Sanitation Engineering

基　　金：浙江省自然科学基金重点项目(LCZ19E080001);建设部科技计划项目(2020-K-026);浙江省自然科学基金探索项目(LQ21E080003);浙江省建设厅建设科研项目(2020-K-164);台州市科技项目(1902gy18)。

摘　　要：选取苯酚作为典型有机污染物,在有机改性膨润土与膨润土不同混合比例的条件下,进行苯酚吸附机理试验研究。首先选取浓度为150 mg/L苯酚溶液,分别按1∶1、1∶0.5和1∶0.25配比,配备有机改性膨润土-膨润土的混合土样,在3种配比条件下进行吸附试验,并根据苯酚标定曲线,确定苯酚的吸附平衡浓度及吸附平衡时间;再进行吸附动力学模型分析,发现吸附试验结果与准二阶动力学方程拟合结果最为接近;最后对不同吸附时间的有机膨润土土样进行X射线衍射(X Ray Diffraction,XRD)试验,并对图谱进行统计分析,发现吸附苯酚溶液后的有机改性膨润土的层间距随吸附时间的增加先增大后减小,且随吸附时间增加有机改性膨润土开始出现解吸附现象,直到处于饱和状态。Phenol was selected as a typical organic pollutant,and the phenol adsorption mechanism was experimentally studied under the conditions of different mixing ratios of organic modified bentonite and bentonite.Firstly,a phenol solution with a concentration of 150 mg/L was selected,a mixed soil sample of organic modified bentonite-bentonite was prepared under the conditions of three ratios of 1∶1,1∶0.5 and 1∶0.25.The adsorption experiments were carried out under the three kinds of proportioning conditions,and according to the phenol calibration curve,the equilibrium adsorption concentration and adsorption equilibrium time of phenol were determined.Then the adsorption kinetic model was analyzed,and it was found that the adsorption test results were closest to the fitting results of the quasi second order kinetic equation.Finally,the samples of organic bentonite with different adsorption times were tested by X-ray diffraction(XRD)and their atlas were statistically analyzed.It was found that the layer spacing of organic modified bentonite after adsorption of phenol solution increased firstly and then decreased with the increase of adsorption time.And with the increase of adsorption time,the organic modified bentonite began to desorb until it was in the saturated state.

关 键 词：有机改性膨润土 吸附动力学拟合 X射线衍射 土层间距 苯酚 

分 类 号：X53[环境科学与工程—环境工程]