Adsorption performance and mechanism of waste paper-derived phosphorus-rich carbon for separation of uranium from radioactive wastewater

Wei, Xiaolong; Li, Hong; Zhang, Xu; Luo, Chuanlei; Wang, Hai; Liu, Longcheng; Yue, Chengtao

doi:10.1016/j.jece.2024.112486

Cited by 8 publications

(1 citation statement)

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“…Wastepaper is a complex material and contains cellulose fibers (containing functional polar groups, such as alcohol and ether) and inorganic fillers, such as kaolin, clay, and calcium carbonate [21]. Paper waste is biocompatible and biodegradable, is produced in large quantities, and is, therefore, readily available [22]. The cellulose-rich nature of paper waste makes it a good potential resource for the production of carbon material for the removal of MB and Cr(VI).…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%