Bisphenol A adsorption and transport in loess and cationic surfactant/hydrophilic polymer modified bentonite liners

Haijian Xie; Jiawei Wu; Mengzhen Yu; Huaxiang Yan; Shakil Masum; Peifu Cai; Yun Chen

doi:10.1016/j.jenvman.2023.117604

Bisphenol A adsorption and transport in loess and cationic surfactant/hydrophilic polymer modified bentonite liners

J Environ Manage. 2023 Jun 15:336:117604. doi: 10.1016/j.jenvman.2023.117604. Epub 2023 Mar 3.

Authors

Haijian Xie¹, Jiawei Wu², Mengzhen Yu¹, Huaxiang Yan³, Shakil Masum⁴, Peifu Cai¹, Yun Chen⁵

Affiliations

¹ College of Civil Engineering and Architecture, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China; Center for Balance Architecture, Zhejiang University, 148 Tianmushan Road, Hangzhou, 310007, China.
² College of Civil Engineering and Architecture, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China; The Architectural Design and Research Institute of Zhejiang University Co. Ltd, 148 Tianmushan Rd, Hangzhou, 310058, China.
³ College of Civil Engineering and Architecture, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China. Electronic address: yanhuaxiang@zju.edu.cn.
⁴ Geoenvironmental Research Centre, Cardiff University, S Glam, Cardiff, Wales, CF24 3AA, UK.
⁵ Center for Balance Architecture, Zhejiang University, 148 Tianmushan Road, Hangzhou, 310007, China; The Architectural Design and Research Institute of Zhejiang University Co. Ltd, 148 Tianmushan Rd, Hangzhou, 310058, China.

PMID: 36871453
DOI: 10.1016/j.jenvman.2023.117604

Abstract

Bisphenol A (BPA) is a toxic endocrine disruptor often found in landfill leachate. Adsorption behaviors and mechanisms of BPA onto organo-bentonites amended loess, e.g., Hexadecyltrimethylammonium chloride-bentonite (HTMAC-B) and Carboxymethylcellulose-bentonite (CMC-B) were experimentally investigated. The adsorption capacity of loess amended by HTMAC-B (LHB) and CMC-B (LCB) is 4.2 and 4 times greater than that of loess (L), respectively. It is attributed to the increase of hydrogen bonds and hydrophobic lateral interactions between the adsorbent and the adsorbate. The binary (Pb²⁺-BPA) systems may enhance BPA adsorption onto the samples by the formation of coordination bonds between the hydroxyl group of BPA and Pb²⁺ ions. A cycled column test was used for investigating the transport behavior of BPA in LHB and LCB samples. The hydraulic conductivity of loess amended by the organo-bentonite (e.g., HTMAC-B, CMC-B) is generally lower than 1 × 10^-9 m/s. Especially for CMC-B amended loess, the hydraulic conductivity can be reduced to 1 × 10^-12 m/s. This guarantees the hydraulic performance of the liner system. Transport behavior of BPA in cycled column test is explained by the mobile-immobile model (MIM). Modelling results showed that loess amended by organo-bentonites can increase the breakthrough time of BPA. In comparison to loess-based liner, the breakthrough time of BPA for LHB and LCB can be increased by a factor of 10.4 and 7.5, respectively. These results indicate that organo-bentonites can serve as a potentially effective amendment for improving the adsorption of loess-based liners.

Keywords: Adsorption; Bisphenol A; Breakthrough time; Landfill liner; Loess amended organo-bentonites.

MeSH terms

Adsorption
Lead*
Surface-Active Agents
Water Pollutants, Chemical* / chemistry

Substances

bisphenol A
Lead
hexadecyltrimethylammonium bentonite
Water Pollutants, Chemical
Surface-Active Agents