Enhanced adsorption capacity and selectivity toward inorganic and organic mercury ions from aqueous solution by dye-affinity adsorbents
| Autor: | Norasikin Saman, Hanapi Mat, Siew Chin Cheu, Shiow Tien Song, Helen Kong, Khairiraihanna Johari |
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| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Natural-gas condensate Aqueous solution Renewable Energy Sustainability and the Environment General Chemical Engineering chemistry.chemical_element 010501 environmental sciences 01 natural sciences Produced water Mercury (element) chemistry.chemical_compound Adsorption chemistry Methyl orange Environmental Chemistry Selectivity Waste Management and Disposal Methylene blue 0105 earth and related environmental sciences General Environmental Science Water Science and Technology Nuclear chemistry |
| Zdroj: | Environmental Progress & Sustainable Energy. 38:S54-S67 |
| ISSN: | 1944-7442 |
| DOI: | 10.1002/ep.12915 |
| Popis: | Adsorption of inorganic mercury [Hg(II)] and organic methylmercury [MeHg(II)] ions onto dye-affinity agrowaste (dye-AW) was investigated. The dye-affinity adsorbents were prepared by the chemical-thermal reaction between the agrowaste (AW) and dye solutions [i.e., Reactive Red 120 (RR), Reactive Black B (RB), Methylene Blue (MB), and Methyl Orange (MO)] under an alkaline condition. An almost perfect removal of Hg(II) was observed for all adsorbents, while for MeHg(II), the dye-affinity adsorbents have a higher removal efficiency than a pristine adsorbent. The maximum adsorption capacity (Q e, max ) of mercury ions onto the Reactive Red 120-modified AW (RR-AW) was 2.60 mmol g −1 for Hg(II) and 0.76 mmol g −1 for MeHg(II). The adsorption rate of Hg(II) was faster than MeHg(II), and both kinetic data followed the pseudo-second order kinetic model with the diffusion steps controlled by the film diffusion. The regenerated adsorbent showed very encouraging results especially toward Hg(II). The promising results were also obtained by using oilfield produced water (OPW) and natural gas condensate (NGC) samples. These studies finally demonstrated that the agricultural wastes initially loaded with dyes have the potential to be good mercury adsorbents. |
| Databáze: | OpenAIRE |
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