Sodium Dodecylbenzenesulfonate Self-Assembled LDH Based on Dual Reversal of Surface Charge/Hydrophilicity-Hydrophobicity: Efficient Removal Mechanism of Crystal Violet

Wenxian Wang; Minghui Wu; Xiaolong Sun; Yifan Bian; Shiping Zhou; Shouqing Liu; Huijuan Li; Haijiao Xie

doi:10.1007/s12209-026-00491-3

Transactions of Tianjin University ›› :1 -18. DOI: 10.1007/s12209-026-00491-3

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Sodium Dodecylbenzenesulfonate Self-Assembled LDH Based on Dual Reversal of Surface Charge/Hydrophilicity-Hydrophobicity: Efficient Removal Mechanism of Crystal Violet

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¹Yunnan Provincial Key Laboratory of State Forestry and Grassland Administration On Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China, Southwest Forestry University, 650224, Kunming, China

², Hangzhou Yanqu Information Technology Co., Ltd., 310003, Hangzhou, China

Corresponding author:

^a muzilihuijuan@163.com

Wenxian Wang,

Wenxian Wang Master’s candidate, Southwest Forestry University.

Minghui Wu,

Minghui Wu Master’s candidate, Southwest Forestry University.

Xiaolong Sun,

Xiaolong Sun Master’s candidate, Southwest Forestry University.

Yifan Bian,

Yifan Bian Master’s candidate, Southwest Forestry University.

Shiping Zhou,

Shiping Zhou Professor, Southwest Forestry University.

Shouqing Liu,

Shouqing Liu Professor, Southwest Forestry UniversityHuijuan Li, Associate Professor, Southwest Forestry University Haijiao Xie, Hangzhou Yanqu Information TechnologyCo., Ltd.

Huijuan Li,

Huijuan Li Prof. of College of Materials and Chemical Engineering, Southwest Forestry University. She has long been engaged in research in the fields of automotive exhaust catalysis and photocatalytic degradation of pollutants in water. A total of 30 papers have been published in domestic and international journals, including 20 indexed in SCI and 3 in EI. As an associate editor, one textbook titled Guidance for Physical Chemistry Experiments was co-edited and published by Yunnan Education Publishing House. Three Chinese invention patents have been filed, with two granted. Completed research projects include one project funded by the Yunnan Provincial Department of Education, one general project of the Yunnan Provincial Agricultural Basic Research Joint Special Program, and two teaching research projects at Southwest Forestry University. Currently underway are one key project of the Yunnan Provincial Agricultural Basic Research Joint Special Program, one open fund project of the Key Laboratory of National Forestry and Grassland Administration for Efficient Utilization of Forestry Biomass in Southwest China, and one project of the Biomass Materials Chemistry and Application Innovation Platform at Southwest Forestry University.

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Abstract

The environmental challenges posed by the discharge of printing and dyeing wastewater urgently require effective treatment technologies. This study developed an efficient adsorbent through sodium dodecylbenzenesulfonate (SDBS) self-assembled Mg/Al-layered double hydroxides (LDHs) via a one-step hydrothermal method. When an Mg²⁺/Al³⁺/SDBS molar ratio was 3:1:1.40, and calcination was performed at 300 °C for 2 h, the adsorbent achieved a markedly high removal efficiency of 84.8% and an adsorption capacity of 63.6 mg/g, substantially outperforming the unmodified LDH (8.4% removal, 6.3 mg/g). SDBS acted as an effective structure modifier, inducing morphology regulation, a dual inversion of hydrophilicity/hydrophobicity (the contact angle of Mg/Al-LDH was measured to be 124.08°, whereas that of Mg/Al/SDBS-LDH was 0°), and surface charge reversal, which critically enhanced the adsorption of crystal violet (CV). The synergistic mechanism involved mesopore filling, electrostatic attraction, hydrogen bonding, and π–π interactions. This study demonstrates that SDBS-modified LDHs are highly promising adsorbents for advancing environmental remediation strategies.

Keywords

SDBS-modified Mg/Al-LDH / Morphological control / Hydrophilicity/hydrophobicity adjustment / Adsorption mechanism

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Wenxian Wang, Minghui Wu, Xiaolong Sun, Yifan Bian, Shiping Zhou, Shouqing Liu, Huijuan Li, Haijiao Xie. Sodium Dodecylbenzenesulfonate Self-Assembled LDH Based on Dual Reversal of Surface Charge/Hydrophilicity-Hydrophobicity: Efficient Removal Mechanism of Crystal Violet. Transactions of Tianjin University 1-18 DOI:10.1007/s12209-026-00491-3

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