A comparative study of acid-treated, base-treated, and Fenton-like reagent-treated biomass for Cr(VI) sequestration from aqueous solutions
| Autor: | Obakeng Nchoe, Themba D. Ntuli, Michael J. Klink, Fanyana M. Mtunzi, Vusumzi E. Pakade |
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| Rok vydání: | 2020 |
| Předmět: |
Chromium
chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Adsorption 020401 chemical engineering Specific surface area Environmental Chemistry Freundlich equation Biomass 0204 chemical engineering Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Aqueous solution Ecological Modeling Biosorption Hydrogen-Ion Concentration Pollution Solutions Kinetics chemistry Sodium hydroxide Reagent Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Water environment research : a research publication of the Water Environment FederationReferences. 93(3) |
| ISSN: | 1554-7531 |
| Popis: | A wide variety of biomass materials have been used for the removal of toxic chromium(VI) by biosorption. The current study investigated the efficacy of Macadamia nutshells treated with sodium hydroxide, nitric acid, and the Fenton-like reagent in the removal of Cr(VI). The adsorbents were characterized by FTIR, SEM, TGA, and elemental analysis. Effects of functional parameters influencing the adsorption of Cr(VI), solution pH (pH 1-11), contact time (5-250 min), concentration of adsorbent (1-10 g/L), and adsorbate concentration (10-200 mg/L) were investigated. The optimum conditions for biosorption were pH 1.4, adsorbent dose of 5 g/L, and 160 min of contact time. In all cases, the base-treated adsorbent displayed superior performance compared to others, with highest percent removal of 98%. The adsorbate-adsorbent interactions were better explained by the Freundlich isotherm and the pseudo-first-order rate model. The Macadamia-based adsorbents are potentially useful for Cr(VI) removal from aqueous solutions. PRACTITIONER POINTS: Three different chemical activators were investigated for the modification of Macadamia surface. The base-treated material exhibited the highest specific surface area of 12.1 m2 /g. The Cr(VI) adsorption performance for the base-treated material dwarfed the other materials. Excellent Cr(VI) removal efficiency in the presence of competitors was achieved. |
| Databáze: | OpenAIRE |
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