Competitive Adsorption of Anionic and Cationic Molecules on Three Activated Carbons Derived from Agroindustrial Waste

Martı́nez, Rodrigo; Vela-Carrillo, Alina Z.; Godı́nez, Luis A.; Pérez‐Bueno, José de Jesús; Robles, Irma

doi:10.2139/ssrn.4053263

Cited by 1 publication

(1 citation statement)

References 31 publications

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“…0.4 gram of each PWM and PWC was placed separately in 30 mL solutions of 0.1 M HCl, 0.1 M sodium hydroxide, 0.1 M sodium carbonate, and 0.1 M sodium hydrogen carbonate, respectively, and each sample was sealed with aluminum foil and placed at 30 °C for 10 hours and then filtered. For filtrates containing excess unconsumed washing soda, baking soda, or caustic soda, 10 mL of each filtrate was titrated against a standard solution of 0.1 M HCl to determine the number of carboxylic, phenolic, and lactone groups, and 0.1 M NaOH to assess the number of basic groups such as -NH 2 groups on each PWM and PWC [33,34].…”

Section: Preparation and Characterizations Of Adsorbentsmentioning

confidence: 99%

Eco-Friendly Detoxification of Congo Red Dye from Water by Citric Acid Activated Bioadsorbents Consisting of Watermelon and Water Chestnuts Peels Collected from Indigenous Resources

Hussain

Rehman

Imran

et al. 2022

Adsorption Science & Technology

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The native peels of two cheap, locally available adsorbents, watermelon (PWM) and water chestnuts (PWC), were chemically processed with different chemicals as modifying agents for the determination and assessment of their adsorption ability for the removal and clearance of harmful, venomous, and pernicious Congo red (CGR), as an acidic nature anionic dye, from the aqueous system. In successive batch experiments, the citric acid-treated peels CPWM and CPWC have shown more promising adsorption performance than their raw and untreated peel counterparts due to the availability of additional adsorption active binding sites evidenced through FT-IR and SEM characterizations. In the Langmuir and Temkin models, the correlation coefficients ( R 2 ) for the adsorptive removal of CGR on CPWM, PWM, CPWC, and PWC are very close to unity, 0.99 for each case of adsorption performance. Furthermore, the q max nonlinear statistical results for the elimination of CGR on citric acid-treated adsorbents (CPWM and CPWC) are 8.3 and 7.95 mg/g whereas for their unmodified forms (PWM and PWC) are 2.23 and 4.32 mg/g, respectively, reflecting homogenous and monolayer adsorption mechanism. The greater values of B T 1.4 and 1.3 J/mole, for adsorptive removal of dye on CPWM and CPWC, respectively, as compared to their unmodified forms PWM and PWC which are 0.53 and 0.55 J/mole, respectively, indicate the stronger adsorbate-adsorbent associations. The mechanism follows the pseudo second order in the better mode, while thermodynamic statics for ΔH0,ΔG0, ΔS0, and ΔE0, indicate spontaneous and exothermic behavior of adsorption. This study tends to suggest that citric acid-modified adsorbents CPWM and CPWC may indeed be exploited efficiently to eliminate Congo red dye from wastewater.

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Section: Preparation and Characterizations Of Adsorbentsmentioning

confidence: 99%