Removal of dyes from aqueous solution using fly ash and red mud
Abstract
Fly ash and red mud have been employed as adsorbents for the removal of a typical basic dye, methylene blue, from aqueous solution. Heat treatment and chemical treatment have also been applied to the as-received fly ash and red mud samples. It is found that fly ash generally shows higher adsorption capacity than red mud. The raw fly ash and red mud show adsorption capacity at 1.4 x 10(-5) and 7.8 x 10(-6) mol/g, respectively. Heat treatment reduces the adsorption capacity for both fly ash and red mud but acid treatment by HNO(3) induces a different effect on fly ash and red mud. Nitric acid treatment results in an increase in adsorption capacity of fly ash (2.4 x 10(-5) mol/g) while it decreases the adsorption capacity for red mud (3.2 x 10(-6) mol/g). The adsorption data have been analysed using Langmuir, Freundlich and Redlich-Peterson isotherms. The results indicate that the Redlich-Peterson model provides the best correlation of the experimental data. Isotherms have also been used to obtain the thermodynamic parameters such as free energy, enthalpy and entropy of adsorption. For fly ash and red mud, adsorption of methylene blue is endothermic reaction with DeltaH(0) at 76.1 and 10.8 kJ/mol, respectively.
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In other domains, coal fly ash is considered a forerunner for several applications in adsorption, material synthesis such as zeolites, geopolymers, ceramics, and as a catalyst support.
“In other domains, coal fly ash is considered as a forerunner for several applications in adsorption, 162-164 material synthesis such as zeolites, [165][166][167] geopolymers, 168-170 ceramics, 171,172 and as a catalyst support.[173][174][175]”
From Sustainable hybrid photocatalysts: titania immobilized on carbon materials derived from renewable and biodegradable resources (2016) · cites this paper as [163]
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- Authors
- Wang, S., Boyjoo, Y., Choueib, A., & Zhu, Z. H.
- Affiliations
- Curtin University (AU)
- Corresponding author
- Wang, Shaobin
- Venue
- Water Research
- Publisher
- Elsevier BV
- Published
- 2005-01
- Volume
- 39
- Issue
- 1
- Pages
- 129-138
- ISSN
- 0043-1354 (ISSN-L)
- OpenAlex
- W2087434336
- Cited by
- 924
- References
- 20
- Citations by year
- 2026: 16 · 2025: 23 · 2024: 43 · 2023: 31 · 2022: 41 · 2021: 46 · 2020: 57 · 2019: 46 · 2018: 73 · 2017: 56 · 2016: 56 · 2015: 61 · 2014: 54 · 2013: 55 · 2012: 51
- FWCI
- 33.81
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Water Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Mechanical Engineering › Bauxite Residue and Utilization
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Coal and Its By-products
- Keywords
- dye removal, methylene blue, fly ash, red mud, adsorption, low-cost adsorbent, nitric acid treatment, heat treatment, adsorption isotherms, Redlich-Peterson isotherm, adsorption thermodynamics, wastewater treatment
- MeSH terms
- Adsorption, Aluminum, Carbon, Hot Temperature, Hydrogen-Ion Concentration, Industrial Waste, Methylene Blue, Solutions, Water Pollutants, Chemical, Nitric Acid, Particulate Matter, Coal Ash
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