聚丙烯酰胺改良土-膨润土的渗透性及对苯酚的吸附

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (6): 2201-2208.

所属专题：新型功能材料

聚丙烯酰胺改良土-膨润土的渗透性及对苯酚的吸附

宋向阳¹, 刘霖^1,2, 张永鹏¹

1.内蒙古工业大学土木工程学院,呼和浩特 010051;
2.内蒙古自治区土木工程结构与力学重点实验室,呼和浩特 010051

收稿日期:2021-12-03 修订日期:2022-02-23 出版日期:2022-06-15 发布日期:2022-07-01
通信作者: 刘霖,副教授。E-mail:374628630@qq.com
作者简介:宋向阳(1997—),男,硕士研究生。主要从事环境岩土工程方面的研究。E-mail:431327429@qq.com
基金资助:
内蒙古自治区自然科学基金(2019MS05059)

Permeability of Polyacrylamide Modified Soil-Bentonite and Its Adsorption of Phenol

SONG Xiangyang¹, LIU Lin^1,2, ZHANG Yongpeng¹

1. School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
2. The Inner Mongolia Key Laboratory of Civil Engineering Structure and Mechanics, Hohhot 010051, China

Received:2021-12-03 Revised:2022-02-23 Online:2022-06-15 Published:2022-07-01

摘要/Abstract

摘要： 为提高土-膨润土(SB)隔离屏障的渗透性及其对苯酚的吸附效果,制备一种聚丙烯酰胺改良土-膨润土(PSB)。研究聚丙烯酰胺掺量、苯酚浓度、干湿作用、冻融作用对PSB隔离屏障渗透系数的影响及对苯酚的吸附效果,并从微观层次揭示其作用机理。结果表明:苯酚浓度对PSB隔离屏障渗透系数没有影响;干湿作用下PSB隔离屏障渗透系数增加但仍保持在同一个数量级,而冻融作用下隔离屏障渗透系数增大1~2个数量级;聚丙烯酰胺可使干湿、冻融作用下隔离屏障的渗透系数有所降低,即可有效抑制干湿、冻融的破坏作用;掺加0.7%(质量分数)聚丙烯酰胺的PSB隔离屏障对苯酚的吸附率可达69%以上,相比SB隔离屏障吸附率约提高50%,且随着苯酚污染液浓度增加,吸附率逐渐提高。该研究可为苯酚污染的隔离与封闭提供理论依据与参数支持。

关键词: 土-膨润土, 聚丙烯酰胺, 渗透系数, 吸附率, 孔隙结构, 干湿作用, 冻融作用

Abstract: In order to improve the permeability of the soil-bentonite (SB) isolation barrier and its adsorption effect on phenol, a polyacrylamide modified soil-bentonite (PSB) was prepared. The effects of polyacrylamide content, phenol concentration, dry-wet cycles and freeze-thaw cycles on the permeability coefficient of PSB isolation barrier and the adsorption effect on phenol were studied, and the mechanism of these effects were revealed at micro level. The results show that phenol concentration has no effect on permeability coefficient of PSB isolation barrier. The permeability coefficient of PSB isolation barrier increases under dry-wet cycles but remains the same order of magnitude. The permeability coefficient of PSB isolation barrier increases by 1~2 orders under freeze-thaw cycles. Polyacrylamide reduces the permeability coefficient of PSB isolation barrier under dry-wet cycles and freeze-thaw cycles, indicating that it can effectively restrain the destructive effects of dry-wet cycles and freez-thaw cycles. The adsorption rate of phenol on the PSB isolation barrier with 0.7% (mass fraction) polyacrylamide reaches over 69%, which is about 50% higher than that on the SB barrier, and gradually increases with the increase of concentration of phenol contaminated solution. The research can provide theoretical basis and parameter support for isolation and closure of phenol pollution.

Key words: soil-bentonite, polyacrylamide, permeability coefficient, adsorption rate, pore structure, dry-wet cycle, freez-thaw cycle

中图分类号:

宋向阳, 刘霖, 张永鹏. 聚丙烯酰胺改良土-膨润土的渗透性及对苯酚的吸附[J]. 硅酸盐通报, 2022, 41(6): 2201-2208.

SONG Xiangyang, LIU Lin, ZHANG Yongpeng. Permeability of Polyacrylamide Modified Soil-Bentonite and Its Adsorption of Phenol[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(6): 2201-2208.

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聚丙烯酰胺改良土-膨润土的渗透性及对苯酚的吸附

Permeability of Polyacrylamide Modified Soil-Bentonite and Its Adsorption of Phenol

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