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

Xie, Haijian, Wu, Jiawei, Yu, Mengzhen, Yan, Huaxiang, Masum, Shakil ORCID:, Cai, Peifu and Chen, Yun 2023. Bisphenol A adsorption and transport in loess and cationic surfactant/hydrophilic polymer modified bentonite liners. Journal of Environmental Management 336 , 117604. 10.1016/j.jenvman.2023.117604

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0301-4797
Date of Acceptance: 24 February 2023
Last Modified: 11 Apr 2023 12:34

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