Interpretation of the adsorption process of toxic Cd<sup>2+</sup> removal by modified sweet potato residue

Gao, Yu; Yi, Zhuolin; Wang, Jinling; Ding, Fan; Fang, Yang; Du, Anping; Jiang, Yijia; Zhao, Hai; Jin, Yanling

doi:10.1039/d3ra06855b

Cited by 1 publication

(1 citation statement)

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“…The graph shows that stabilization and equilibrium were achieved within 60 min for all adsorbents. The rapid adsorption removal observed at the beginning of the process can be explained by the fact that the adsorbent initially had abundant active sites and a larger exposed surface area and pore size [31]. Over time, the pores and surface area became occupied and the active sites depleted, resulting in little to no adsorption [32].…”

Section: Contact Time Effectmentioning

confidence: 99%

Activated Carbon from Paper Waste as Potential Adsorbents for Methylene Blue and Hexavalent Chromium

Mabalane,

Thabede,

Shooto

2024

Applied Sciences

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Environmental pollution is a significant problem and is increasing gradually as more and more harmful pollutants are being released into water bodies and the environment. Water pollutants are dangerous and pose a threat to all living organisms and the ecosystem. Paper waste is one of the most widespread and largest wastes in the world. This research aims to address two important problems simultaneously: the reduction in solid waste in the environment using activated carbon from paper waste as potential adsorbents and the removal of harmful contaminants from water. Carbon from paper waste was activated with H2O2, HNO3, and KMnO4 for the adsorption of Cr(VI) and MB. SEM, EDX, FTIR, Raman, and BET were used to determine the properties of the materials. The surface morphology of the materials consisted of amorphous particles. EDX shows that all activated samples have a higher content of (O) than carbon paper waste. Adsorption studies showed that there was a stronger interaction between the pollutants and the adsorbent at a higher initial concentration (200 mg/L) than at the lower initial concentrations. The contact time data show that uptake increases when the interaction time between the contaminant and the adsorbent is increased. The tests for the pH of the solution show that the adsorption of Cr(VI) decreases when the pH is gradually increased, whereas the adsorption of MB increases when the pH of the solution is increased. The results fit better with the Freundlich isotherm and PSO models. The temperature studies show that the enthalpy was positive, indicating that the uptake process is endothermic. The Gibbs free energy values were all negative, indicating that adsorption between the adsorbents and the pollutants was favored. After four consecutive cycles, all the samples retained more than 60% of their uptake capability.

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Section: Contact Time Effectmentioning

confidence: 99%

Activated Carbon from Paper Waste as Potential Adsorbents for Methylene Blue and Hexavalent Chromium

Mabalane,

Thabede,

Shooto

2024

Applied Sciences

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Interpretation of the adsorption process of toxic Cd²⁺ removal by modified sweet potato residue

Abstract: Sweet potato residue modified by NaOH removed Cd2+ by complexation, ion exchange, and precipitate during a monolayer chemisorption adsorption process.

Cited by 1 publication

References 55 publications

Activated Carbon from Paper Waste as Potential Adsorbents for Methylene Blue and Hexavalent Chromium

Activated Carbon from Paper Waste as Potential Adsorbents for Methylene Blue and Hexavalent Chromium

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Interpretation of the adsorption process of toxic Cd2+ removal by modified sweet potato residue

Abstract: Sweet potato residue modified by NaOH removed Cd2+ by complexation, ion exchange, and precipitate during a monolayer chemisorption adsorption process.

Cited by 1 publication

References 55 publications

Activated Carbon from Paper Waste as Potential Adsorbents for Methylene Blue and Hexavalent Chromium

Activated Carbon from Paper Waste as Potential Adsorbents for Methylene Blue and Hexavalent Chromium

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Interpretation of the adsorption process of toxic Cd²⁺ removal by modified sweet potato residue