Adsorption behavior of chromium in an aqueous suspension of δ-alumina in absence and in presence of humic substances
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Ashraf A. El-sayed
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Hisham F. Aly
Abstract
The radioisotope Cr-51 was exploited for studying the chromium adsorption behavior in aqueous media of alumina in aqueous media. Where, it represents 1.8% by weight and exists in earth’s crust in different forms. Factors affecting this adsorption behavior are pH, amount of alumina and humic acid presence. In case of pH adsorption curves, three different areas under peak can be described based on pH changes which lead to the formation of different species too. The first area is the maximum constant adsorption at pH, range 1–3, the second one is adsorption decreasing with increasing pH through pH range 4–7 and the third one is step-down adsorption at higher pH range. The increasing amount of alumina leads to increase in the percent adsorption, where 10 and 2 g/l alumina were found to have 100% while in case of 0.2 g/l it is 80%. The presence of humic acid decreases the adsorption of chromate with increasing pH to be 30% comparing to 80% in case of 0.2 g/l alumna at pH 2. This can be also indicated by adsorption capacity which is found to be 436.8 μg/g in case of 0.2 g alumina; and it decreases in presence of Humic Acid (HA) to 145.8 μg/g at same weight of alumina. Also, the equilibrium capacities are found as 54.6 μg/g for 2 g/l and 1.2 μg/g for 10 g/l. Triple layer model (TLM) was used for simulation of chromium adsorption behavior in presence of alumina with the applied conditions of study. The results showed high coincidence with the practically found data.
Acknowledgments
As a part of Ph.D. thesis the first author would like to thanks Prof. Dr. Saad E. Hassan, who sponsored such work. Also, thanks to prof. Dr. H. F.Aly and late Prof. Dr. A. A.Rassoul and late Emeritus Dr. S. A. Al-Alfy for continuous support and advice. Part of this work was done in EC, Ispra Italy as part of an IAEA scientific visiting program in 1994–1995.
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Author contribution: Ashraf A. El-sayed, conceptualization, drafting of manuscript and data analysis. Hisham F. Aly, revision and correction.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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© 2022 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Original Papers
- Spectroscopic investigation of the different complexation and extraction properties of diastereomeric diglycolamide ligands
- Influence of plutonium oxidation state on the formation of molecular hydrogen, nitrous acid and nitrous oxide from alpha radiolysis of nitric acid solution
- Efficient enrichment of U(VI) by two-dimensional layered transition metal carbide composite
- Application of artificial neural networks for predicting the isotopic composition of high burn-up solid plutonium sample using the 90–105 keV gamma-spectrum region
- Efficient and selective adsorption of U(VI) by succinic acid modified iron oxide adsorbent
- Electrochemical reduction of uranium and rhenium in hydrochloric acid system
- A sensitive improved method for analyzing diffusion coefficients of Cs in compacted bentonite with different lengths
- Adsorption behavior of chromium in an aqueous suspension of δ-alumina in absence and in presence of humic substances
- A novel theranostic probe [111In]In-DO3A-NHS-nimotuzumab in glioma xenograft
- Lead-free Sb-based polymer composite for γ-ray shielding purposes
Artikel in diesem Heft
- Frontmatter
- Original Papers
- Spectroscopic investigation of the different complexation and extraction properties of diastereomeric diglycolamide ligands
- Influence of plutonium oxidation state on the formation of molecular hydrogen, nitrous acid and nitrous oxide from alpha radiolysis of nitric acid solution
- Efficient enrichment of U(VI) by two-dimensional layered transition metal carbide composite
- Application of artificial neural networks for predicting the isotopic composition of high burn-up solid plutonium sample using the 90–105 keV gamma-spectrum region
- Efficient and selective adsorption of U(VI) by succinic acid modified iron oxide adsorbent
- Electrochemical reduction of uranium and rhenium in hydrochloric acid system
- A sensitive improved method for analyzing diffusion coefficients of Cs in compacted bentonite with different lengths
- Adsorption behavior of chromium in an aqueous suspension of δ-alumina in absence and in presence of humic substances
- A novel theranostic probe [111In]In-DO3A-NHS-nimotuzumab in glioma xenograft
- Lead-free Sb-based polymer composite for γ-ray shielding purposes
