Functionalization of petroleum pitch-based porous carbon foams and their application in radionuclides adsorption/decontamination

Kim, Do Kyung; Kim, Sung Hyun; Hong, Jin‐Yong

doi:10.1016/j.cartre.2021.100108

Cited by 4 publications

(1 citation statement)

References 33 publications

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“…The other contaminant, hexavalent chromium (Cr(VI)), exists in the aquatic environment in various anionic forms of HCrO 4 − , Cr 2 O 7 2− , and CrO 4 2− depending on the pH of the medium (Zekavat et al 2020).Radionuclides of cesium and chromium co-exist in radioactive liquid wastes generated from radioisotope production facilities and/or radiochemistry research laboratories. Among the various technologies applied for the removal of (radio)contaminants from liquid wastes which include solvent extraction, chemical precipitation, reverse osmosis, membrane separation, and adsorption (Kim et al 2021;Pineda et al 2021;Chen et al 2020;Rogers et al 2012), the last one is often preferred due to its high efficiency, simplicity, low-cost, and reversibility. Inorganic, organic, and composite materials are the three known types of adsorbents used for this process.…”

Section: Introductionmentioning

confidence: 99%

Efficient adsorption of cesium cations and chromate anions by one-step process using surfactant-modified zeolite

Hamoud

Abo-Zahra

Attia

et al. 2023

Environ Sci Pollut Res

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Natural zeolite is organically modified with the surfactant cetyltrimethylammonium bromide (CTAB) and employed as a dual-function material for simultaneous adsorption of Cs+ cations and HCrO4− anions from aqueous solutions. Unmodified and modified zeolites are characterized by Fourier transform infrared (FTIR), dynamic light scattering (DLS), nitrogen adsorption–desorption isotherms, and X-ray diffraction (XRD). The results showed that CTAB-zeolite had the efficiency to simultaneously adsorb the concerned species in the pH range 2.5–4.2. The kinetic data showed that 90 and 300 min for Cs(I) and Cr(VI), respectively, were sufficient to attain equilibrium and the data are well-fitted by the double-exponential kinetic model. Of the studied adsorption isotherm models, Redlich-Peterson was the best one for describing the equilibrium adsorption isotherms. Values of ∆H°, ∆S°, and ∆G° for the present adsorption processes are estimated. CTAB-zeolite exhibited adsorption capacities of 0.713 and 1.216 mmol/g for Cs(I) and Cr(VI), respectively, which are comparable with the data reported in the literature. The adsorption mechanism of the concerned (radio)toxicants is proposed.

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