Adsorption of nitrate in water by CTAB-modified MgFe layered double hydroxide composite biochar at low temperature: Adsorption characteristics and mechanisms

Wang, Weixin; Zhu, Qi; Huang, Ruochen; Hu, Yuhan

doi:10.1016/j.jece.2022.109090

Cited by 8 publications

(25 citation statements)

References 57 publications

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“…CTAB, as a cationic surfactant for surface modification, enhances the hydrophobicity of La@D. The hydrophobic nature indicates a greater affinity for the adsorption of organic pollutants. 44 Additionally, XRD analysis shows that CTAB molecules enter the interlayers of the Laponite nanosheets, increasing the interlayer spacing. The increased interlayer spacing allows for more exchange of pollutant molecules, 1 thereby enhancing its adsorption performance.…”

Section: Resultsmentioning

confidence: 99%

“…This indicates that the ability of the organic modifier to enter into the interlayer of Laponite is limited. It is undeniable that the successful intercalation of organic molecules is favorable for the adsorption of anionic pollutants …”

Section: Resultsmentioning

confidence: 99%

“…This is consistent with the previous conclusion. CTAB, as a cationic surfactant for surface modification, enhances the hydrophobicity of La@D. The hydrophobic nature indicates a greater affinity for the adsorption of organic pollutants . Additionally, XRD analysis shows that CTAB molecules enter the interlayers of the Laponite nanosheets, increasing the interlayer spacing.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, according to a previous study, the reaction with ΔG in the scope of −20−0 kJ/mol is a physisorption process. 44,46 3.2.7. Adsorption of PNP.…”

Section: Effect Of Dosage Figures 4b−d and S2mentioning

confidence: 99%

“…Cetyltrimethylammonium bromide (CTAB) is a positively charged surfactant commonly used for surface modification of clay materials. , It has the advantages of environmental friendliness and low toxicity . Research has indicated that CTAB modification can increase the surface functional groups of the material and also enhance its affinity for organic pollutants to improve its anionic pollutant adsorption performance. , It has been pointed out that for layered materials, CTAB molecules can increase the spacing between layers to capture pollutant molecules …”

Section: Introductionmentioning

confidence: 99%

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Cetyltrimethylammonium Bromide-Modified Laponite@Diatomite Composites for Enhanced Adsorption Performance of Organic Pollutants

Dai,

Liu,

Yang

et al. 2024

Langmuir

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This work aims to enhance the adsorption performance of Laponite @diatomite for organic pollutants by modifying it with cetyltrimethylammonium bromide (CTAB). The microstructure and morphology of the CTAB-modified Laponite @ diatomite material were characterized using SEM, XRD, FTIR, BET, and TG. Furthermore, the influences of key parameters, containing pH, adsorbent dosage, reaction time, and reaction temperature, on the adsorption process were investigated. The kinetics, thermodynamics, and isotherm models of the adsorption process were analyzed. Finally, potential adsorption mechanisms were given based on the characterization. The research findings indicate that CTAB-La@D exhibits good adsorption performance toward Congo red (CR) over a broad pH range. The maximum adsorption capacity of CR was 451.1 mg/g under the optimum conditions (dosage = 10 mg, contact time = 240 min, initial CR concentration = 100 mg/L, temperature = 25 °C, and pH = 7). The adsorption process conformed to the pseudo-second-order kinetic model, and the adsorption isotherms indicated that the adsorption process of CR was more in line with the Langmuir model, and it was physical adsorption. Thermodynamic analysis illustrates that the adsorption process is exothermic and spontaneous. Additionally, the mechanisms of electrostatic adsorption and hydrophobic effect adsorption of CR were investigated through XPS and FTIR analysis. This work provides an effective pathway for designing high-performance adsorbents for the removal of organic dye, and the synthesized materials hold great capability for practical utilization in the treatment of wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…In addition, according to a previous study, the reaction with ΔG in the scope of −20−0 kJ/mol is a physisorption process. 44,46 3.2.7. Adsorption of PNP.…”

Section: Effect Of Dosage Figures 4b−d and S2mentioning

confidence: 99%