CTAB改性地质聚合物对地下污染源的阻截作用  

Interception Effect of Geopolymer Modified by CTAB on Underground Pollution Sources

作　　者：刘佳宁 洪梅[1,2] 魏涛 陈日[3] 宋博宇 LIU Jianing;HONG Mei;WEI Tao;CHEN Ri;SONG Boyu(College of New Energy and Environment,Jilin University,Changchun 130021,China;National Local Joint Engineering Laboratory of Petrochemical Pollution Site Control and Remediation Technology,Jilin University,Changchun 130021,China;BCEG Environmental Remediation Co.,Ltd.,Beijing 100020,China;Foreign Environmental Cooperation Center,Ministry of Ecology and Environment,Beijing 100035,China)

机构地区：[1]吉林大学新能源与环境学院,长春130021 [2]吉林大学石油化工污染场地控制与修复技术国家地方联合工程实验室,长春130021 [3]北京建工环境修复股份有限公司,北京100020 [4]生态环境部对外合作与交流中心,北京100035

出　　处：《硅酸盐通报》2023年第5期1831-1840,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(42177052)。

摘　　要：针对有机污染物和无机金属离子复合地下水污染源的阻截问题,本文提出了一种以十六烷基三甲基溴化铵(CTAB)为改性剂的地质聚合物阻截墙材料设计方法,并研究了改性剂掺加量对地质聚合物渗透系数、兼容性能、吸附能力及抗压强度的影响。结果表明:改性地质聚合物在保持良好渗透系数、兼容性能及抗压强度的前提下,对苯酚-六价铬复合地下水污染源表现出较高的吸附能力,可作为一种经济有效的阻截墙材料;当水玻璃掺量为8%(质量分数)、水玻璃模数为1.0、水灰比为0.30、CTAB掺加量为2.0%(质量分数)时,样品渗透系数为4.61×10^(-8)cm/s,抗压强度为6.25 MPa,对苯酚和Cr(VI)的去除率可分别达57.51%和28.18%。此外,随CTAB掺加量增大,改性地质聚合物渗透系数、吸附能力呈上升趋势,抗压强度则呈下降趋势,试块表观均未出现劣化现象。In view of the interception problem of organic pollutants and inorganic metal ions combined with groundwater pollution sources,a design method of geopolymer interception wall material with cetyltrimethylammonium bromide(CTAB)as modifier was proposed,and the influence of the amount of modifier on the permeability coefficient,compatibility,adsorption capacity and compressive strength of geopolymer were studied.The results show that the modified geopolymer has a high adsorption capacity to the phenol-hexavalent chromium compound groundwater pollution source under the premise of maintaining good permeability coefficient,compatibility and compressive strength,and can be used as an economical and effective interception wall material.When the content of sodium silicate is 8%(mass fraction),the modulus of sodium silicate is 1.0,the water-raw material ratio is 0.30,and CTAB addition is 2.0%(mass fraction),the permeability coefficient of the sample is 4.61×10^(-8)cm/s,the compressive strength is 6.25 MPa,and the removal rates of phenol and Cr(VI)can reach 57.51%and 28.18%,respectively.In addition,with the increase of CTAB addition,the permeability coefficient and adsorption capacity of the modified geopolymer increase,while the compressive strength decreases,and no deterioration phenomenon appears in the test blocks.

关 键 词：地质聚合物 十六烷基三甲基溴化铵 阻截墙 凝结时间 渗透系数 吸附能力 

分 类 号：X523[环境科学与工程—环境工程]