LAPSE:2021.0645
Published Article
LAPSE:2021.0645
Sorption of Organic Pollutants onto Soils: Surface Diffusion Mechanism of Congo Red Azo Dye
Camelia Smaranda Bețianu, Petronela Cozma, Mihaela Roșca, Elena-Diana Comăniță Ungureanu, Ioan Mămăligă, Maria Gavrilescu
July 28, 2021
For the protection of human and ecological receptors from the effects of soil pollution with chemical compounds, we need to know the behavior and transport of pollutants in soil. This work investigated the Congo red (CR) acid dye sorption on three natural soils collected from central and northeastern regions of Romania, symbolized as IS-65, IS-T, and MH-13. To define the mechanism of sorption and identify the rate governing step, various diffusion models such as Weber−Morris intraparticle diffusion, Boyd, film and pores diffusion, and mass transfer analysis have been verified. The intraparticle diffusion analysis of Congo red sorption onto soils has been described by a multi-linear plots, showing that the sorption process takes place by surface sorption and intraparticle diffusion in macro, meso, and micropores. The values of intraparticle diffusion coefficient kid increased with any rise of the initial concentration of pollutant. The results show that the values of pore diffusion coefficient (Dp) and film diffusion coefficient (Df) are found to be from 10−8 to 10−10 cm2 s−1, indicating that film diffusion influences the sorption rate limiting step. The intraparticle diffusion analysis shows that the plots did not pass through the origin and have two distinct parts, confirming that intraparticle diffusion is not the single determining mechanism involved in the sorption of Congo red on soils IS-65, IS-T, and MH-13. The results revealed that the sorption process has a complex nature, since both external diffusion and internal diffusion are involved in the sorption of CR from solution onto the investigated soils.
Keywords
Congo red, diffusion, rate limiting step, soil, sorption mechanism
Suggested Citation
Smaranda Bețianu C, Cozma P, Roșca M, Comăniță Ungureanu ED, Mămăligă I, Gavrilescu M. Sorption of Organic Pollutants onto Soils: Surface Diffusion Mechanism of Congo Red Azo Dye. (2021). LAPSE:2021.0645
Author Affiliations
Smaranda Bețianu C: Department of Environmental Engineering and Management, “Cristofor Simionescu” Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73 Prof. D. Mangeron Blvd., 700050 Iaşi, Romania
Cozma P: Department of Environmental Engineering and Management, “Cristofor Simionescu” Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73 Prof. D. Mangeron Blvd., 700050 Iaşi, Romania [ORCID]
Roșca M: Department of Environmental Engineering and Management, “Cristofor Simionescu” Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73 Prof. D. Mangeron Blvd., 700050 Iaşi, Romania
Comăniță Ungureanu ED: Department of Environmental Engineering and Management, “Cristofor Simionescu” Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73 Prof. D. Mangeron Blvd., 700050 Iaşi, Romania
Mămăligă I: Department of Chemical Engineering, “Cristofor Simionescu” Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73 Prof. D. Mangeron Blvd., 700050 Iaşi, Romania [ORCID]
Gavrilescu M: Department of Environmental Engineering and Management, “Cristofor Simionescu” Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73 Prof. D. Mangeron Blvd., 700050 Iaşi, Romania; Academy
Journal Name
Processes
Volume
8
Issue
12
Article Number
E1639
Year
2020
Publication Date
2020-12-11
Published Version
ISSN
2227-9717
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PII: pr8121639, Publication Type: Journal Article
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LAPSE:2021.0645
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doi:10.3390/pr8121639
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Jul 28, 2021
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Calvin Tsay
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