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. 2018 May 23;8(34):19041-19050.
doi: 10.1039/c8ra02707b. eCollection 2018 May 22.

Decontamination of radioactive cesium ions using ordered mesoporous monetite

Ali F Tag El-Din  1 , Emad A Elshehy  2 , Mahmoud O Abd El-Magied  2 , Asem A Atia  3 , Mohamed E El-Khouly  1
Affiliations

Decontamination of radioactive cesium ions using ordered mesoporous monetite

Ali F Tag El-Din et al. RSC Adv. .

Abstract

We report herein the fabrication of an environmentally friendly, low-cost and efficient nanostructured mesoporous monetite plate-like mineral (CaHPO4) as an adsorbent for removal of radioactive cesium ions from aqueous solutions. The phase and textural features of the synthesized mesoporous monetite were well characterized by XRD, FTIR, SEM, HRTEM, DLS, TGA/TDA, and N2 adsorption/desorption techniques. The results indicate that the cesium ions were effectively adsorbed by the mesoporous monetite ion-exchanger (MMT-IEX) above pH 9.0. Different kinetic and isotherm models were applied to characterize the cesium adsorption process. The fabricated monetite exhibited a monolayer adsorption capacity up to 60.33 mg g-1 at pH of 9.5. The collected data revealed the higher ability of CaHPO4 for the removal of Cs(i) from aqueous media in an efficient way.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. (a) X-ray diffraction pattern for monetite (CaHPO4) sample used in this study; Bragg reflections showed correspond to monetite as detailed in ICDD card number 04-012-8346. (b) FTIR spectra of the mesoporous monetite (MTT-IEX) sample nanoparticles.
Fig. 2
Fig. 2. (a) N2 adsorption–desorption isotherm and pore size distribution plot (inset). (b) TGA/DTA of the mesoporous MMT-IEX nanoparticles.
Fig. 3
Fig. 3. (a) Representative SEM, (b and c) TEM image for monetite nano-plates with different magnifications, (d) HRTEM shows evidence of the formation of ordered mesoporous structures, (e) STEM images of calcium (green), oxygen (blue) and phosphorous (red) and EDS analysis results, and the calculated values of the atomic abundance of the species present, and (f) particle size distribution and zeta potential (inset) of mesoporous MMT-IEX sorbent.
Fig. 4
Fig. 4. (a) Effect of pH on the adsorption of Cs(i) ions on CaP-MS; initial Cs(i) concentration 150 mg L−1, MMT-IEX weight 30 mg, solution volume 20 mL, contact time 90 min and 25 °C. (b) Effect of contact time on the adsorption of Cs(i) ions on MMT-IEX from a single ion solution; pH 9.5 initial Cs(i) concentration 150 mg L−1, MMT-IEX weight 30 mg, solution volume 20 mL at 25 °C. Kinetic profile of the cesium adsorption on MMT-IEX with different models. (c) The pseudo-second-order, (d) Weber–Morris, (e) McKay, and (f) Bangham plots for the adsorption cesium on MMT-IEX sorbent.
Fig. 5
Fig. 5. (a) Isotherm of Cs(i) ions adsorption on MMT-IEX from a single ion solution; pH 9.5, 30 mg MMT-IEX weight, 20 mL solution volume, 20 min contact time and 25 °C. (b) Langmuir, (c) D–R, and (d) Temkin plots for the adsorption cesium on the MMT-IEX sorbent.
Fig. 6
Fig. 6. Selectivity profiles of mesoporous MMT-IEX towards Cs(i) ions during the addition of various foreign metal ions (5 mg L−1) at optimal adsorption conditions (MMT-IEX weight 40 mg, volume solution 30 mL, eq. time 90 min and 25 °C). The interfered cations listed in the order (1–20) Li(i), Na(i), K(i), Mg(ii), Ca(ii), Sr(ii), Ba(ii), Rb(i), Fe(iii), Al(iii), Ni(ii), Cu(ii), Hg(ii), Pb(ii), Mn(ii), Cd(ii), La(iii), Zr(iv), U(vi) and Th(iv).
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