Green synthesis of SnO2-ZnO-eggshell nanocomposites and study of their application in removal of mercury (II) ions from aqueous solution
Autor: | Marieh Honarmand, Mohammad Mirzadeh, Moones Honarmand |
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Rok vydání: | 2020 |
Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis Metal ions in aqueous solution chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Applied Microbiology and Biotechnology Catalysis Metal Adsorption 020401 chemical engineering 0204 chemical engineering Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Nanocomposite Aqueous solution Public Health Environmental and Occupational Health Pollution Mercury (element) chemistry visual_art visual_art.visual_art_medium Selectivity Nuclear chemistry |
Zdroj: | Journal of Environmental Health Science and Engineering. 18:1581-1593 |
ISSN: | 2052-336X |
Popis: | Mercury (Hg) in dental amalgam is the world’s hidden source of mercury contamination. The development of more eco-friendly and cost-effective adsorbents to reduce mercury pollutants in wastewater is highly desirable and is still a major challenge. In this study, a novel nanocomposite was synthesized and used as an efficient adsorbent for the removal of Hg(II) ions from aqueous solution. A green and cost-effective method was described to the synthesis of SnO2-ZnO-eggshell nanocomposites using teucrium polium extract as a renewable reductant and mild stabilizer. The biosynthesized nanocomposites were characterized by various techniques. The novel SnO2-ZnO-eggshell nanocomposites were used as an effective adsorbent in the removal of mercury (II) ions. To achieve the maximum absorption efficiency of Hg(II) ions, the effect of operating factors such as pH value, the dose of catalyst, the initial metal concentration of Hg(II) ions, and catalyst type were evaluated. The removal percentage and adsorption capacity of Hg(II) were obtained 99.15% and 396.6 mg.g−1, respectively, under optimal conditions after 5 minutes. The selectivity of SnO2-ZnO-eggshell nanocomposites for the adsorption of metal ions was studied, and the highest selectivity was obtained for adsorption of Hg (II) ions. Furthermore, the SnO2- ZnO-eggshell nanocomposites could be recovered and reused at least three times without considerable loss of their efficiency. The present approach has advantages such as rapidity, simplicity, selectivity, low cost and, most importantly, the use of nanocomposites containing a bio-waste material of eggshell for removal of Hg(II) ions from aqueous solution. |
Databáze: | OpenAIRE |
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