Ceramic matrices for immobilization of heavy metals adsorbed on rice husk
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Ceramic matrices for immobilization of heavy metals adsorbed on rice husk Melisa Romano1 · Gisela Pelozo2 · Nancy Quaranta2 · Valeria Corne1 · María del Carmen García1 Received: 5 November 2019 / Accepted: 15 April 2020 © Springer Nature Switzerland AG 2020
Abstract Numerous studies have been conducted about the removal of heavy metal ions from aqueous solutions using lignocellulosic materials, which are capable of adsorbing various contaminants present even at low concentrations. Rice husk constitutes biomass waste that has found multiple applications in different fields, such as the removal of heavy metals by adsorption. After this process, a biomass-contaminant waste is generated, which currently does not have viable and low-cost alternatives for its final disposal. Thus, the objective of this work is to evaluate the possibility of incorporating rice husk contaminated with Cu–Ni–Cd and Pb–Zn into ceramic matrices, to immobilize these hazardous metals. Ceramic pieces from mixtures of commercial clay and rice husk with adsorbed metal, added by 10% in volume were obtained. The raw materials were characterized by different techniques, such as SEM-EDS, XRD, DTA-TGA, particle size distribution, ecotoxicity, etc., while in ceramic products were analysed porosity, permanent volumetric variation, weight loss of ignition, ecotoxicity, among others. From the overall results, it is possible to conclude that the obtained ceramic pieces have immobilized within their structure, the heavy metals present on rice husk. The bricks have excellent physical and mechanical properties that make possible their use in civil construction. Graphic abstract
Nancy Quaranta: CIC Researcher * Melisa Romano, [email protected] | 1Dpto. de Materias Básicas, Facultad Regional Concepción del Uruguay, Universidad Tecnológica Nacional, Ingeniero Pereyra 676, E‑3260 Concepción del Uruguay, Entre Ríos, Argentina. 2Grupo de Estudios Ambientales (GEA), Facultad Regional San Nicolás, Universidad Tecnológica Nacional, Colón 332, 2900 San Nicolás, Buenos Aires, Argentina. SN Applied Sciences
(2020) 2:964
| https://doi.org/10.1007/s42452-020-2767-3
Vol.:(0123456789)
Research Article
SN Applied Sciences
(2020) 2:964
| https://doi.org/10.1007/s42452-020-2767-3
Keywords Heavy metals · Rice husk · Ceramic matrices · Clay bricks
1 Introduction The continuous population growth and industrial development have led to the demand for new products and services whose processes generate liquid effluents with high concentrations of bioaccumulative, non-biodegradable and carcinogenic toxic substances. These effluents must be adequately treated to eliminate their toxicity or reduce it to adequate levels so they can be discarded to watercourses without damaging ecosystems. Heavy metals such as lead, copper, cadmium, zinc and nickel, are considered priority environmental pollutants, due to the toxicity that metal ions present in living organisms. After their release from various sources, such as industrial and agricultural activities, heavy metals are no
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