[1] QIN Qingdong, ZHANG Zhiting, BAO Xun, GAO Xia, et al. Adsorption behavior and mechanism of organophosphate flame retardants on montmorillonite modified with hexadecyltrimethylammonium bromide [J]. Journal of Southeast University (English Edition), 2025, 41 (4): 483-492. [doi:10.3969/j.issn.1003-7985.2025.04.010]

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Adsorption behavior and mechanism of organophosphate flame retardants on montmorillonite modified with hexadecyltrimethylammonium bromide()

十六烷基三甲基溴化铵改性蒙脱土对有机磷阻燃剂的吸附行为与机理

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

41

Issue:

2025 4

Page:

483-492

Research Field:

Environmental Science and Engineering

Publishing date:

2025-11-30

Info

Title:

Adsorption behavior and mechanism of organophosphate flame retardants on montmorillonite modified with hexadecyltrimethylammonium bromide

十六烷基三甲基溴化铵改性蒙脱土对有机磷阻燃剂的吸附行为与机理

Author(s):

QIN Qingdong¹, ZHANG Zhiting¹, BAO Xun², GAO Xia¹, XU Yan¹

1.School of Civil Engineering, Southeast University, Nanjing 211189, China
2.Nanjing Water Group Co., Ltd., Nanjing 210018, China

秦庆东¹, 张志婷¹, 鲍寻², 高霞¹, 许妍¹

1.东南大学土木工程学院, 南京 211189
2.南京水务集团有限公司, 南京 210018

Keywords:

montmorillonite;  hexadecyltrimethylammonium bromide;  organophosphate flame retardants (OPFRs);  adsorption;  modification

蒙脱石; 十六烷基三甲基溴化铵; 有机磷阻燃剂; 吸附; 改性

PACS:

X505

DOI:

10.3969/j.issn.1003-7985.2025.04.010

Abstract:

The widespread presence of organophosphate flame retardants (OPFRs) in aquatic environments has raised significant concerns regarding environmental and human health risks. In this study, the adsorption behavior of two representative aromatic OPFRs, triphenylphosphine oxide (TPPO) and triphenyl phosphate (TPhP), was systematically investigated using organically modified montmorillonite (MMT). The effects of various environmental and operational parameters, including cationic surfactant dosage, temperature, pH, ionic strength, and humic acid (HA) concentration, on OPFR adsorption were thoroughly examined. Results revealed that modification with hexadecyltrimethylammonium bromide enhanced the TPPO and TPhP adsorption capacities of MMT. The adsorption process was largely independent of pH and HA concentration, and the presence of inorganic cations significantly improved the adsorption efficiency. Adsorption equilibrium was achieved within 30 min, with kinetics best described by a pseudo-second-order model. The adsorption isotherms exhibited a linear relationship, and the distribution coefficients for TPPO and TPhP were 0.16 and 0.51 L/g, respectively. Thermodynamic analysis indicated that the considered adsorption was more favorable at lower temperatures. The primary adsorption mechanism was attributed to the partitioning behavior facilitated by the organophilic nature of the modified MMT. Moreover, the adsorbent demonstrated excellent regeneration performance, with its adsorption capacity remaining stable over five consecutive cycles. Overall, these findings show that cationic surfactant-modified MMT has a promising potential for application in wastewater treatment to effectively remove OPFRs from aqueous systems.

有机磷阻燃剂（OPFRs）在水环境中的广泛存在已引发了其对潜在环境与人体健康风险的高度关注。本研究系统地考察了三苯基膦氧化物（TPPO）和三苯基磷酸酯（TPhP）两种典型的芳香族有机磷阻燃剂在有机改性蒙脱石上的吸附行为，深入探究了阳离子表面活性剂投加量、温度、pH值、离子强度以及腐殖酸浓度等多种环境与操作参数对OPFRs吸附效能的影响。结果表明，十六烷基三甲基溴化铵改性显著提高了TPPO和TPhP在蒙脱石上的吸附能力。吸附过程对pH值和腐殖酸浓度变化响应不敏感，而无机阳离子则显著提升了吸附效率。吸附在30 min内达到平衡，其动力学过程符合伪二级模型。吸附等温线呈线性关系，TPPO和TPhP的分配系数分别为0.16和0.51 L/g。热力学分析表明低温条件更有利于吸附，主要吸附机制为改性蒙脱石亲有机性驱动的分配行为。此外，改性蒙脱石在连续5次吸附-解吸循环中仍保持稳定的吸附性能，显示出良好的再生能力。研究结果表明，阳离子表面活性剂改性蒙脱石在废水处理中具有良好的应用前景，可有效去除水体中的有机磷阻燃剂。

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Memo

Memo:

Received 2025-04-15,Revised 2025-06-30.
Biography:Qin Qingdong (1980—), male, doctor, associate professor, qinqingdong@seu.edu.cn.
Foundation items:The National Natural Science Foundation of China (No. 42377020),the Innovation Project of Nanjing Water Group Co., Ltd. (No. YF2025-009).
Citation:QIN Qingdong,ZHANG Zhiting,BAO Xun,et al.Adsorption behavior and mechanism of organophosphate flame retardants on montmorillonite modified with hexadecyltrimethylammonium bromide[J].Journal of Southeast University (English Edition),2025,41(4):483-492.DOI:10.3969/j.issn.1003-7985.2025.04.010.DOI:10.3969/j.issn.1003-7985.2025.04.010

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