Insight into the role of the zeolitization process in enhancing the adsorption performance of kaolinite/diatomite geopolymer for effective retention of Sr (II) ions; batch and column studies.

Journal of Environmental Management
Mohamed Abdel SalamMostafa R Abukhadra

Abstract

Diatomite/kaolinite-based geopolymer (GP) was synthesized and incorporated in zeolitization process (Z/GP) to investigate the role of the zeolite phases in inducing its retention capacity of the dissolved Sr (II) ions in water. The retention of Sr (II) ions using Z/GP in comparison with GP was evaluated based on both batch and fixed-bed column studies. In the batch study, the zeolitized geopolymer (Z/GP) shows enhancement in the Sr (II) retention capacity (193.7 mg/g) as compared to the normal geopolymer (102 mg/g). Moreover, the recyclability studies demonstrate higher stability for Z/GP than GP with a retention percentage higher than 90% for five reusing runs. The kinetic and the equilibrium properties of the occurred Sr (II) retention reactions follow the assumption of the Pseudo-Second order model (R2 > 0.96) and Langmuir model (R2 > 0.97), respectively. The Gaussian energies (15.4 kJ/mol (GP) and 11.47 kJ/mol (Z/GP)) related to retention mechanism of chemical type and within the suggested range for the zeolitic ion exchange processes. The Sr (II) retention reactions by GP and Z/GP are of spontaneous and exothermic properties which qualifies the products to be used at low-temperature conditions (20 °C). The column studies a...Continue Reading

References

Jun 7, 2015·Journal of Environmental Radioactivity· LalhmunsiamaSeung-Mok Lee
Jan 9, 2017·Journal of Hazardous Materials·Eungyeong KimYong-Kwon Koh
Nov 9, 2018·Journal of Hazardous Materials·Rong ChengJianlong Wang
Nov 22, 2018·Journal of Colloid and Interface Science·Zhimin LvTasawar Hayat
Jul 8, 2020·International Journal of Biological Macromolecules·Ali H JawadZaher Mundher Yaseen
Jul 14, 2020·International Journal of Biological Macromolecules·Jinfeng MeiZhongyu Li
Oct 17, 2020·Journal of Environmental Radioactivity·Hanyu WuMingliang Kang

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