Engineering a low-cost diatomite with Zn-Mg-Al Layered triple hydroxide (LTH) adsorbents for the effectual removal of Congo red: Studies on batch adsorption, mechanism, high selectivity, and desorption

Vishal, K.; Aruchamy, Kanakaraj; Sriram, G.; Ching, Yern Chee; Oh, Tae Hwan; Hegde, Gurumurthy; Ajeya, Kanalli V.; Joshi, Siddharth; Sowriraajan, A. V. E.; Jung, Ho‐Young; Kurkuri, Mahaveer D.

doi:10.1016/j.colsurfa.2023.130922

Cited by 19 publications

(5 citation statements)

References 113 publications

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“…In addition, the peaks at 830 and 656 cm −1 are linked to the vibration of the benzene ring and the C−S bond in CR. 58,69 Thus, FTIR illustrated that the adsorption of CR occurs through physical interactions. The possible mechanism is the hydrophobic interaction of NH 3 + in CTAB with −SO 3 − in CR.…”

Section: Possible Adsorption Mechanismmentioning

confidence: 99%

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: Possible Adsorption Mechanismmentioning

confidence: 99%

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

Dai,

Liu,

Yang

et al. 2024

Langmuir

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“…Nanostructured materials with unique physicochemical properties offer a promising solution for efficient adsorption. Ideally, such materials should be environmentally friendly, have a high adsorption capacity, be selective and reusable, and facilitate the easy removal of the adsorbate [ 17 ]. Mixed metal oxide nanocomposites are currently of great interest to researchers due to their broad range of catalytic, electronic, and magnetic properties and their suitability for heterogeneous catalysis [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Process Optimization and Equilibrium, Thermodynamic, and Kinetic Modeling of Toxic Congo Red Dye Adsorption from Aqueous Solutions Using a Copper Ferrite Nanocomposite Adsorbent

Parimelazhagan,

Chinta,

Shetty

et al. 2024

Molecules

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In the present investigation of copper ferrite, a CuFe2O4 nanocomposite adsorbent was synthesized using the sol–gel method, and its relevance in the adsorptive elimination of the toxic Congo red (CR) aqueous phase was examined. A variety of structural methods were used to analyze the CuFe2O4 nanocomposite; the as-synthesized nanocomposite had agglomerated clusters with a porous, irregular, rough surface that could be seen using FE-SEM, and it also contained carbon (23.47%), oxygen (44.31%), copper (10.21%), and iron (22.01%) in its elemental composition by weight. Experiments were designed to achieve the most optimized system through the utilization of a central composite design (CCD). The highest uptake of CR dye at equilibrium occurred when the initial pH value was 5.5, the adsorbate concentration was 125 mg/L, and the adsorbent dosage was 3.5 g/L. Kinetic studies were conducted, and they showed that the adsorption process followed a pseudo-second-order (PSO) model (regression coefficient, R2 = 0.9998), suggesting a chemisorption mechanism, and the overall reaction rate was governed by both the film and pore diffusion of adsorbate molecules. The process through which dye molecules were taken up onto the particle surface revealed interactions involving electrostatic forces, hydrogen bonding, and pore filling. According to isotherm studies, the equilibrium data exhibited strong agreement with the Langmuir model (R2 = 0.9989), demonstrating a maximum monolayer adsorption capacity (qmax) of 64.72 mg/g at pH 6 and 302 K. Considering the obtained negative ΔG and positive ΔHads and ΔSads values across all tested temperatures in the thermodynamic investigations, it was confirmed that the adsorption process was characterized as endothermic, spontaneous, and feasible, with an increased level of randomness. The CuFe2O4 adsorbent developed in this study is anticipated to find extensive application in effluent treatment, owing to its excellent reusability and remarkable capability to effectively remove CR in comparison to other adsorbents.

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“…Vishal et al explored the adsorption performance and mechanism of Congo red by the DE with Zn-Mg-Al Layered triple hydroxide using batch experiment. The post-modified DE exhibited a higher adsorption capacity (q m = 44.0 mg/g) than bare DE (q m = 0.9 mg/g) for Congo red at pH = 7 [14]. Wang et al improved the multilevel pore structure of DE by loading carbon nanotubes onto the surface of diatomite, and enhanced the adsorption capacity of organic contaminants in shale gas flow back water [15].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Chitosan-Diatomite/Calcium Alginate Composite Hydrogel Beads for the Adsorption of Congo Red Dye

Zhao

Shen

2023

Water

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In this paper, novel eco-friendly cross-linked chitosan-diatomite/calcium alginate (CS-DE@CA) composite hydrogel beads were successfully prepared for water purification. The obtained sorbents were characterized and studied by using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), which confirmed the successful modification and encapsulation of diatomite into hydrogel beads. The adsorption performance of composite beads for Congo red in an aqueous solution was studied by ultraviolet-visible spectrophotometry. In particular, the CS-DE@CA exhibited higher removal efficiencies (~89.9%) than the removal efficiencies (~83.6%) of the DE@CA (in the temperature = 20 °C, 100 mL, 50 mg/L, and pH = 7). It was also found that adsorption capacity of Congo red increased from 23.28 mg/g to 38.84 mg/g when the starting concentration increased from 25 mg/L to 75 mg/L. The adsorption process was dominated by chemisorption, and its maximum adsorption capacity for Congo red was calculated to be 48.42 mg/g by Langmuir model. Additionally, the as-prepared sorbent maintained an exceptional adsorption capacity after four adsorption–desorption cycles. Overall, this study also provides new guidance and avenues for further fabrication and development of eco-friendly purifier for the removal of Congo red in contaminated water.

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Engineering a low-cost diatomite with Zn-Mg-Al Layered triple hydroxide (LTH) adsorbents for the effectual removal of Congo red: Studies on batch adsorption, mechanism, high selectivity, and desorption

Cited by 19 publications

References 113 publications

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

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

Process Optimization and Equilibrium, Thermodynamic, and Kinetic Modeling of Toxic Congo Red Dye Adsorption from Aqueous Solutions Using a Copper Ferrite Nanocomposite Adsorbent

Preparation of Chitosan-Diatomite/Calcium Alginate Composite Hydrogel Beads for the Adsorption of Congo Red Dye

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