Tags

Type your tag names separated by a space and hit enter

Zero-valent iron treatment of dark brown colored coffee effluent: Contributions of a core-shell structure to pollutant removals.
J Environ Manage. 2016 Dec 01; 183(Pt 3):478-487.JE

Abstract

The decolorization and total organic carbon (TOC) removal of dark brown colored coffee effluent by zero-valent iron (ZVI) have been systematically examined with solution pH of 3.0, 4.0, 6.0 and 8.0 under oxic and anoxic conditions. The optimal decolorization and TOC removal were obtained at pH 8.0 with oxic condition. The maximum efficiencies of decolorization and TOC removal were 92.6 and 60.2%, respectively. ZVI presented potential properties for pollutant removal at nearly neutral pH because of its core-shell structure in which shell or iron oxide/hydroxide layer on ZVI surface dominated the decolorization and TOC removal of coffee effluent. To elucidate the contribution of the core-shell structure to removals of color and TOC at the optimal condition, the characterization of ZVI surface by scanning electron microscopy (SEM) with an energy dispersive X-ray spectroscope (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) was conducted. It was confirmed that the core-shell structure was formed and the shell on ZVI particulate surface and the precipitates formed during the course of ZVI treatment consisted of iron oxides and hydroxides. They were significantly responsible for decolorization and TOC removal of coffee effluent via adsorption to shell on ZVI surface and inclusion into the precipitates rather than the oxidative degradation by OH radicals and the reduction by emitted electrons. The presence of dissolved oxygen (DO) enhanced the formation of the core-shell structure and as a result improved the efficiency of ZVI treatment for the removal of colored components in coffee effluents. ZVI was found to be an efficient material toward the treatment of coffee effluents.

Authors+Show Affiliations

Research Center for Biochemical and Environmental Engineering, Department of Applied Chemistry, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan.Bio-Nano Electronics Research Centre, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan.Research Center for Biochemical and Environmental Engineering, Department of Applied Chemistry, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan.Research Center for Biochemical and Environmental Engineering, Department of Applied Chemistry, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan. Electronic address: ykawase@toyonet.toyo.ac.jp.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27623374

Citation

Tomizawa, Mayuka, et al. "Zero-valent Iron Treatment of Dark Brown Colored Coffee Effluent: Contributions of a Core-shell Structure to Pollutant Removals." Journal of Environmental Management, vol. 183, no. Pt 3, 2016, pp. 478-487.
Tomizawa M, Kurosu S, Kobayashi M, et al. Zero-valent iron treatment of dark brown colored coffee effluent: Contributions of a core-shell structure to pollutant removals. J Environ Manage. 2016;183(Pt 3):478-487.
Tomizawa, M., Kurosu, S., Kobayashi, M., & Kawase, Y. (2016). Zero-valent iron treatment of dark brown colored coffee effluent: Contributions of a core-shell structure to pollutant removals. Journal of Environmental Management, 183(Pt 3), 478-487. https://doi.org/10.1016/j.jenvman.2016.08.081
Tomizawa M, et al. Zero-valent Iron Treatment of Dark Brown Colored Coffee Effluent: Contributions of a Core-shell Structure to Pollutant Removals. J Environ Manage. 2016 Dec 1;183(Pt 3):478-487. PubMed PMID: 27623374.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Zero-valent iron treatment of dark brown colored coffee effluent: Contributions of a core-shell structure to pollutant removals. AU - Tomizawa,Mayuka, AU - Kurosu,Shunji, AU - Kobayashi,Maki, AU - Kawase,Yoshinori, Y1 - 2016/09/09/ PY - 2016/03/31/received PY - 2016/08/29/revised PY - 2016/08/31/accepted PY - 2016/9/14/pubmed PY - 2017/4/25/medline PY - 2016/9/14/entrez KW - Coffee effluent KW - Core-shell structure KW - Decolorization KW - Precipitation KW - TOC removal KW - Zero-valent iron SP - 478 EP - 487 JF - Journal of environmental management JO - J Environ Manage VL - 183 IS - Pt 3 N2 - The decolorization and total organic carbon (TOC) removal of dark brown colored coffee effluent by zero-valent iron (ZVI) have been systematically examined with solution pH of 3.0, 4.0, 6.0 and 8.0 under oxic and anoxic conditions. The optimal decolorization and TOC removal were obtained at pH 8.0 with oxic condition. The maximum efficiencies of decolorization and TOC removal were 92.6 and 60.2%, respectively. ZVI presented potential properties for pollutant removal at nearly neutral pH because of its core-shell structure in which shell or iron oxide/hydroxide layer on ZVI surface dominated the decolorization and TOC removal of coffee effluent. To elucidate the contribution of the core-shell structure to removals of color and TOC at the optimal condition, the characterization of ZVI surface by scanning electron microscopy (SEM) with an energy dispersive X-ray spectroscope (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) was conducted. It was confirmed that the core-shell structure was formed and the shell on ZVI particulate surface and the precipitates formed during the course of ZVI treatment consisted of iron oxides and hydroxides. They were significantly responsible for decolorization and TOC removal of coffee effluent via adsorption to shell on ZVI surface and inclusion into the precipitates rather than the oxidative degradation by OH radicals and the reduction by emitted electrons. The presence of dissolved oxygen (DO) enhanced the formation of the core-shell structure and as a result improved the efficiency of ZVI treatment for the removal of colored components in coffee effluents. ZVI was found to be an efficient material toward the treatment of coffee effluents. SN - 1095-8630 UR - https://www.unboundmedicine.com/medline/citation/27623374/Zero_valent_iron_treatment_of_dark_brown_colored_coffee_effluent:_Contributions_of_a_core_shell_structure_to_pollutant_removals_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0301-4797(16)30647-8 DB - PRIME DP - Unbound Medicine ER -