Adsorption of Direct Red 243 dye onto clay: kinetic study and isotherm analysis

Kavcı, Erbil

doi:10.5004/dwt.2021.26861

Cited by 10 publications

(3 citation statements)

References 61 publications

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“…where K D is the absorption energy constant (mol 2 /kJ 2 ) used to calculate the average of sorption free energy E (KJ mol −1 ) provided by Equation ( 8), with adsorption being physical (E < 8 KJ mol −1 ), based on ion exchange (E = 8-16 KJ mol −1 ), or chemisorption (E = 20-40 KJ mol −1 ) [27]. In Equation (9), ε is the Polanyi potential (KJ mol −1 ), R is the universal gas constant (8.314 × 10 −3 KJ mol −1 ), and T is the temperature (K).…”

Section: Isotherm Studymentioning

confidence: 99%

Remediation of Methyl Orange Dye in Aqueous Solutions by Green Microalgae (Bracteacoccus sp.): Optimization, Isotherm, Kinetic, and Thermodynamic Studies

Al Shra’ah,

Al-Fawwaz,

Ibrahim

et al. 2024

Separations

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This study aims to assess the ability of old, immobilized fresh, and free fresh green microalgae (a Bracteacoccus sp.) to remove methyl orange (MO) dye from aqueous solutions. The effects of four factors, including initial MO concentration (5–25 mg L−1), adsorbent dose (0.02–0.10 g mL−1), temperature (4–36 °C), and contact time (5–95 min), were examined. The Box–Behnken design (BBD) was used to determine the number of required experiments and the optimal conditions expected to provide the highest removal percentage of MO dye from aqueous solutions. The experimental data were applied to four isotherm models (Langmuir, Freundlich, Dubinin–Radushkevich (D–R), and Temkin isotherm models) and three kinetic models (pseudo–first–order, pseudo–second–order, and Elovich kinetic models). The results indicate that the highest removal of MO (97%) could be obtained in optimal conditions consisting of an initial MO concentration of 10.0 mg L−1, an adsorbent dose of 0.10 g mL−1, a temperature of 20 °C, and a contact time of 75 min. Moreover, the experimental data were best fitted by the Langmuir and Temkin isotherm models and followed a pseudo-second-order kinetic model. The interaction between MO and the Bracteacoccus sp. was confirmed by UV and ESI/MS analyses, indicating that MO removal occurred via both sorption and degradation processes.

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Section: Isotherm Studymentioning

confidence: 99%

Remediation of Methyl Orange Dye in Aqueous Solutions by Green Microalgae (Bracteacoccus sp.): Optimization, Isotherm, Kinetic, and Thermodynamic Studies

Al Shra’ah,

Al-Fawwaz,

Ibrahim

et al. 2024

Separations

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“…[7] Among them, adsorption techniques are regarded as one of the most commonly used methods due to their easy operation and high efficiency. [8,9] To date, various adsorbents such as zeolite, [10,11] activated carbon, [12,13] clay, [14,15] metal oxides, [16,17] and polymer resin [18][19][20] have been widely used to adsorb dyes in water. Unfortunately, these adsorbents suffer from several drawbacks such as slow adsorption rate, inefficient adsorption, and poor reusability.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, various treatment models are being used to remove dyes in water bodies, including chemical precipitation, [3] electro‐coagulation, [4] photocatalytic decomposition, [5] adsorption, [6] and ion exchange [7] . Among them, adsorption techniques are regarded as one of the most commonly used methods due to their easy operation and high efficiency [8,9] . To date, various adsorbents such as zeolite, [10,11] activated carbon, [12,13] clay, [14,15] metal oxides, [16,17] and polymer resin [18–20] have been widely used to adsorb dyes in water.…”

Section: Introductionmentioning

confidence: 99%

Efficient Adsorption and Removal of Congo Red from Aqueous Solution Using Magnetic Covalent Organic Framework Nanocomposites

Wei

Long

et al. 2023

ChemistrySelect

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In this work, a core‐shell structured magnetic covalent organic framework (Fe3O4@TpPDA) was synthesized through simple in‐situ growth method by using 1,3,5‐triformylphloroglucinol (Tp) and 1,4‐phenylenediamine (PDA) as precursors, and used as adsorbents for the efficient adsorption and removal of Congo red from aqueous solution. The as‐prepared Fe3O4@TpPDA was characterized by Fourier transform infrared spectroscopy, X‐ray powder diffraction, X‐ray photoelectron spectroscopy spectra and transmission electron microscopy. The influence of initial concentration, adsorption time, and temperature was evaluated. The adsorption of Congo red onto Fe3O4@TpPDA was investigated by adsorption models including Langmuir, Freundlich, pseudo‐first‐order and pseudo‐second‐order kinetic models. The adsorption behavior was fitted well with the Langmuir isotherm and consistent with the pseudo secondary dynamics model. The maximum adsorption capacity was found to be 179.4 mg/g. According to thermodynamic analysis, Congo red adsorption is a spontaneous endothermic reaction. Furthermore, the reusability of Fe3O4@TpPDA was determined by recycling it up to seven times. Thus, Fe3O4@TpPDA was considered to be an excellent adsorbent for the quick and efficient adsorption of Congo red from environmental water.

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A facile and cost‐effective method for crystalline cellulose extraction from sugarcane bagasse applied to remove crystal violet dye from solution

Phong,

Tien,

2024

Vietnam Journal of Chemistry

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In this work, crystalline cellulose (CC) was extracted from sugarcane bagasse through a facile modification method and further applied to absorb crystal violet dye (CV) in aqueous media. The proposed modification approach uses a mixture of NaOH and H2O2 only in a two‐step extraction process. This method is more straightforward than previous extraction methods, which used complex mixtures of solvents and additives. The yield obtained was 76.90%, approximately higher than several works declared before. The as‐prepared product was then determined with Fourier transform infrared spectroscopy (FT‐IR) and X‐ray diffraction (XRD) to analyze the presence of the functional groups and crystallinity, respectively. Furthermore, surface morphology, specific surface area of 0.634 m2 g−1, pore diameters of 3.010 nm, and pore size distribution of the obtained CC were determined with scanning electron microscope (SEM) and Brunauer–Emmett–Teller (BET) methods from the nitrogen adsorption–desorption isotherm, respectively. Additionally, serial experiments were conducted to investigate the influence of pH on the CV removal process. The results showed that the extracted material had a wide operating pH range of 6.0–9.0 and exhibited the highest CV treatment ability at pH 7.0. Besides, the effect of the parameters on the CV removal abilities, such as contact time (1–90 min), adsorbent dose (0.01–0.5 g), and initial CV concentration (10–100 mg L−1), was also investigated. To evaluate the CV removal ability of extract CC in the aqueous media and propose a suitable adsorption mechanism, we used several adsorption isotherms and adsorption kinetic models, such as Langmuir, Freundlich, Temkin, and Elovich. The obtained results showed that the adsorbent followed the pseudo‐second‐order kinetic model. Moreover, according to the Langmuir adsorption isotherm model, the maximum CV adsorption capacity (qm) of the CC was 8.857 mg g−1. Thermodynamic parameters such as −20 < ΔG0 < 0 (kJ mol−1), ΔH0 was 29.500 kJ mol−1, and the positive ΔS0 proved that the CV adsorption process of the CC was physical adsorption, spontaneous and endothermic. Overall, this study offers a simple approach based on the acid hydrolysis method for the high‐value utilization of sugarcane bagasse to isolate CC. This obtained product could become an active adsorbent for removing CV from the aqueous solutions.

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Adsorption of Direct Red 243 dye onto clay: kinetic study and isotherm analysis

Cited by 10 publications

References 61 publications

Remediation of Methyl Orange Dye in Aqueous Solutions by Green Microalgae (Bracteacoccus sp.): Optimization, Isotherm, Kinetic, and Thermodynamic Studies

Remediation of Methyl Orange Dye in Aqueous Solutions by Green Microalgae (Bracteacoccus sp.): Optimization, Isotherm, Kinetic, and Thermodynamic Studies

Efficient Adsorption and Removal of Congo Red from Aqueous Solution Using Magnetic Covalent Organic Framework Nanocomposites

A facile and cost‐effective method for crystalline cellulose extraction from sugarcane bagasse applied to remove crystal violet dye from solution

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