Adsorption of Congo Red Dye on HDTMA Surfactant-Modified Zeolite A Synthesized from Fly Ash

Jumaeri,; Santosa, Sri Juari; Sutarno, .

doi:10.4028/www.scientific.net/ddf.382.307

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…Similar results were found that the CR adsorption was best explained by a pseudo-second-order model [15]. The value of R 2 in pseudo-second-order shows that the adsorption occurs chemically, forming chemical bonds between the adsorbate molecule and the adsorbent surface [30].…”

Section: Adsorption Kineticssupporting

confidence: 81%

“…The adsorption kinetics of CR dye with Mg(OH)2 from seawater bittern was tested using the Lagergren pseudo-first-order model, as in equation ( 4), and the pseudo-second-order Ho shown in equation (5). Where qe and qt are adsorption capacity at equilibrium and at time t (mg/g), k1 and k2 are rate constants of pseudo-first-order and pseudo-secondorder [30,31]. Based on equations ( 4) and ( 5), the kinetic curve of CR adsorption with the Mg(OH)2 is presented in Figure 8.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

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Congo Red Dye Adsorption using Magnesium Hydroxide from Seawater Bittern

et al. 2022

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The study of Mg(OH)2 from seawater bittern as an adsorbent for Congo red (CR) from an aqueous solution has been performed. This study aimed to determine the effect of pH, contact time, and initial CR concentration on CR adsorption by Mg(OH)2. The adsorption kinetics and isotherms of CR on Mg(OH)2 in an aqueous solution were also studied. The optimum adsorption was obtained at pH 8 within 90 minutes of contact time with an adsorption capacity of 46.3 mg/g for an initial CR concentration of 29 mg/L. The adsorption process followed the Freundlich isotherm model with an n value of 2.579 and the pseudo-second-order kinetic model with a k2 value of 0.0021 g mg−1min−1.

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Section: Adsorption Kineticssupporting

confidence: 81%

Section: Adsorption Kineticsmentioning

confidence: 99%

Congo Red Dye Adsorption using Magnesium Hydroxide from Seawater Bittern

et al. 2022

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“…These studies are dependent upon physical and chemical properties of adsorbents and affect the adsorption mechanism [54,55]. Popular models such as pseudofirst-order, pseudo-second-order [55], and Elovich models [56][57][58] were considered to elucidate CR adsorption mechanism on adsorbents.…”

Section: Effect Of Contact Timementioning

confidence: 99%

Adsorptive Behavior of Tartaric Acid Treated Holarrhena antidysenterica and Citrullus colocynthis Biowastes for Decolourization of Congo Red Dye from Aqueous Solutions

Basharat

Rehman

Basharat

2022

Journal of Chemistry

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The aim of the present work is to eradicate Congo red (CR) dye from aqueous solutions since the dye compounds are harmful to human life and the environment leading to detrimental results. For this purpose, Holarrhena antidysenterica (HA) and Citrullus colocynthis (CC) adsorbents were used for the adsorptive removal of Congo red dye from wastewaters. The unmodified adsorbents (U-HA and U-CC) were chemically modified using tartaric acid (TA). Morphological structures were examined by FTIR and SEM. Batch adsorption studies were tested at a variety of pH, time exposure, temperatures, and adsorbent dosages. Thermodynamic parameters such as Gibbs free energy ( ∆ G ° ), enthalpy ( ∆ H ° ), entropy changes ( ∆ S ° ), and energy of activation ( E a ) were also calculated. The results revealed that tartaric acid-Citrullus colocynthis (TA-CC) gave optimum conditions of time of contact (35 min), temperature conditions (40°C), pH (3), and dosage of adsorbent (1.6 g) for maximum dye removal. Tartaric acid-Holarrhena antidysenterica (TA-HA) gave equilibrium time of contact (30 min), temperature (40°C), and pH optimum (2) along with a 1.6 g dosage of adsorbent. Mechanistic understanding of adsorption isotherm provided that the Langmuir model was followed by raw and modified adsorbents. Maximum adsorption capacities Q max attained were 60.61 (mg g-1), 128.21 (mg g-1), 87.71 (mg g-1), and 131.57 (mg g-1), respectively, for U-HA, TA-HA, U-CC, and TA-CC. The results of kinetic modeling displayed a high value of R 2 (0.99) along with minimal error (RMSE) for dye removal showing that the pseudo-second-order kinetic model has acceptable accuracy. Fourier transform infrared proposed the electrostatic, pi-pi interactions, and hydrogen bonding as dominant adsorption mechanisms at acidic pH, respectively. Rate-determining steps comprise both surface and intraparticle diffusions. Thermodynamics indicated that the dye adsorption of CR is spontaneous, exothermic, and favorable in nature. These agricultural wastes due to specific points such as low cost, availability, and high removal rates of adsorption are highly competent for the expulsion of anionic dye like CR from wastewaters.

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