Removal of malachite green dye by sodium dodecyl sulfate modified bentonite clay: Kinetics, thermodynamics and isotherm modeling

Bishwas, Raton Kumar; Mostofa, Sabrina; Alam, Md. Ashraful; Jahan, Shirin Akter

doi:10.1016/j.nxnano.2023.100021

Cited by 4 publications

(4 citation statements)

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“…This implies that intraparticle diffusion is not the only rate-controlling step. Film diffusion on the adsorbent surface may also be involved in adsorption rate control. ,, …”

Section: Resultsmentioning

confidence: 99%

“…The basic assumptions are a multilayer character involving van der Waals forces and that the isotherm model is highly dependent on the temperature. The D–R model is mainly used to estimate the mean free energy of adsorption ( E , kJ/mol) and is therefore considered to discriminate whether the adsorption process is physical or chemical . If E is less than 8 in the fitting result, the process is considered to be physical adsorption, and if 8 < E < 16 it is considered to be chemical adsorption.…”

Section: Resultsmentioning

confidence: 99%

“…The D−R model is mainly used to estimate the mean free energy of adsorption (E, kJ/mol) and is therefore considered to discriminate whether the adsorption process is physical or chemical. 52 If E is less than 8 in the fitting result, the process is considered to be physical adsorption, and if 8 < E < 16 it is considered to be chemical adsorption. In this study, all CTABmodified materials had E less than 8, as shown in Figure 5c and Table 2.…”

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

confidence: 99%

“…Film diffusion on the adsorbent surface may also be involved in adsorption rate control. 31,52,53 3.2.5. Adsorption Isotherms.…”

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

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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“…This implies that intraparticle diffusion is not the only rate-controlling step. Film diffusion on the adsorbent surface may also be involved in adsorption rate control. ,, …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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

confidence: 99%

“…Film diffusion on the adsorbent surface may also be involved in adsorption rate control. 31,52,53 3.2.5. Adsorption Isotherms.…”

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

confidence: 99%

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