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Laminated Porous Diatomite Monoliths for Adsorption of Dyes From Water
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-4628-3857
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-4888-6237
2019 (English)In: Environmental Progress & Sustainable Energy, ISSN 1944-7442, E-ISSN 1944-7450, Vol. 38, no s1, p. 377-385Article in journal (Refereed) Published
Abstract [en]

Structured laminated diatomite monoliths with superior mechanical properties were prepared by controlled freeze-casting of the aqueous suspensions of diatomite powders for wastewater treatment. The directional freezing of suspensions with solids loading of 25, 30, and 37 wt % at cooling from 0.5 to 5 K/min resulted in the formation of lamellar pores and solid walls with the thickness of 12–30 and 14–39 μm, respectively. The increase in solid loading and freezing rate resulted in refinement of the porous structure. Durable monoliths with the mechanical strength of 5.3 MPa were obtained by thermal treatment of the freeze-dried green bodies at 1,373 K. Diatomite monoliths with a pore size of 29.6 μm showed the removal of model dye pollutant Rhodamine B from water by adsorption and long-term water stability. The dye uptake capacity of monolith changed from 1.38 to 17.04 mg/g for the initial dye concentrations between 1.0 and 12.5 mg/L at 298 K and pH = 6, respectively. The adsorption data analysis using Lagergren's pseudo-first-order, pseudo-second-order, and intra-particle diffusion models revealed that diatomite monoliths offered efficient mass transfer in the porous laminated scaffold and to the adsorption sites and bulk diffusion of dye molecules in water was the rate-limiting mechanism for dye removal. © 2018 American Institute of Chemical Engineers Environ Prog, 2018.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019. Vol. 38, no s1, p. 377-385
Keywords [en]
porous ceramic, diatomite, freeze‐casting, adsorption, dye uptake
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-71352DOI: 10.1002/ep.13064ISI: 000460576900040Scopus ID: 2-s2.0-85054712187OAI: oai:DiVA.org:ltu-71352DiVA, id: diva2:1258932
Note

Validerad;2019;Nivå 2;2019-03-08 (johcin)

Available from: 2018-10-26 Created: 2018-10-26 Last updated: 2019-04-12Bibliographically approved

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Nikjoo, DariushAkhtar, Farid

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