Removal of chromium (VI) ions from polluted water using kaolinite-supported Fe/Al oxide(hydroxide) composite nanoadsorbents

Show simple item record Bezza, Fisseha Andualem Chirwa, Evans M.N. 2023-05-10T12:41:01Z 2023-05-10T12:41:01Z 2022
dc.description.abstract Hexavalent chromium (Cr (VI)) contamination of surface and groundwater has become a major environmental concern owing to the diverse applications of Cr(VI)) in several industries. In the current study kaolinite-supported and size-controlled Fe/Al oxide(oxyhydroxide) nanocomposites (Kaolinite@Fe/Al nanocomposites) were synthesized for efficient removal of Cr(VI) from aqueous solution. Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) analysis of the nanocomposites revealed that the nanocomposites were uniformly dispersed, with an average particle size of ~ 25 nm. Batch adsorption studies were carried out to study the effect of (Kaolinite@Fe/Al nanocomposites) on the removal of chromium (VI) from 100 mg/L Cr(VI) contaminated water over a wide pH range (3–10) at various adsorbent dosages. The result demonstrated that the nanocomposites’ adsorption efficiency increased with increasing adsorbent dosage. When the Kaolinite@Fe/Al nanocomposites dosage was increased from 1.0 to 3.0 g/L, the Cr(VI) removal percentage increased from 65.4 % to ∼99.0 %. This is due to the greater surface area and availability of more adsorption sites at higher dosages of the adsorbent. There was a significant removal of Cr(VI) in the pH range 3–6 reaching up to 99.0% Cr(VI) removal, however, removal efficiency decreased drastically beyond pH 6. Chromium (VI) exists as CrO4 2−, HCrO4 − and Cr2O7 2− oxyanionic species while the surface of the adsorbent becomes highly protonated, owing to the variable surface charge imparted by Al/Fe oxides/hydroxides favouring remarkable uptake of Cr(VI) in the anionic form. The experimental data fitted Langmuir adsorption model well with a maximum adsorption capacity of 70.71 mg/g. The results of the study demonstrate that Kaolinite@Fe/Al nanocomposites may have a promising potential for remediation of Cr(VI) contaminated wastewater and industrial effluents. en_US
dc.description.department Chemical Engineering en_US
dc.description.librarian am2023 en_US
dc.description.sponsorship The Water Research Commission (WRC) grant for externally funded Postdoctoral Fellowship and the National Research Foundation (NRF) of South Africa. en_US
dc.description.uri en_US
dc.identifier.citation Bezza F.A., Chirwa E.M.N., 2022, Removal of Chromium (vi) Ions from Polluted Water Using Kaolinite Supported Fe/Al Oxide(hydroxide) Composite Nanoadsorbents, Chemical Engineering Transactions, 94, 1453-1458. DOI:10.3303/CET2294242. en_US
dc.identifier.issn 2283-9216 (online)
dc.identifier.other 10.3303/CET2294242
dc.language.iso en en_US
dc.publisher Italian Association of Chemical Engineering en_US
dc.rights © 2022, AIDIC Servizi S.r.l. en_US
dc.subject Hexavalent chromium (Cr (VI)) en_US
dc.subject Contamination en_US
dc.subject Surface en_US
dc.subject Groundwater en_US
dc.subject Scanning electron microscopy (SEM) en_US
dc.subject Transmission electron microscopy (TEM) en_US
dc.title Removal of chromium (VI) ions from polluted water using kaolinite-supported Fe/Al oxide(hydroxide) composite nanoadsorbents en_US
dc.type Article en_US

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