Removing arsenic from water with an original and modified natural manganese oxide ore : batch kinetic and equilibrium adsorption studies
Arsenic contamination of drinking water is a serious water quality problem in many parts of the world. In this study, a low-cost manganese oxide ore from Vietnam (Vietnamese manganese oxide (VMO)) was firstly evaluated for its performance in arsenate (As(V)) removal from water. This material contains both Mn (25.6%) and Fe (16.1%) mainly in the form of cryptomelane and goethite minerals. At the initial As(V) concentration of 0.5 mg/L, the adsorption capacity of original VMO determined using the Langmuir model was 0.11 mg/g. The modified VMOs produced by coating VMO with iron oxide (Fea-VMO) and zirconium oxide (Zra-VMO) at 110 °C and 550 °C achieved the highest As(V) adsorption capacity when compared to three other methods of VMO modifications. Langmuir maximum adsorption capacities of Fea-VMO and Zra-VMO at pH 7.0 were 2.19 mg/g and 1.94 mg/g, respectively, nearly twenty times higher than that of the original VMO. Batch equilibrium adsorption data fitted well to the Langmuir, Freundlich, and Temkin models and batch kinetics adsorption data to pseudo-first order, pseudo-second order, and Elovich models. The increase of pH progressively from 3 to 10 reduced As(V) adsorption with a maximum reduction of 50-60% at pH 10 for both original and modified VMOs. The co-existing oxyanions considerably weakened the As(V) removal efficiency because they competed with As(V) anions. The competition order was PO43- > SiO32- > CO32- > SO42-. The characteristics of the original and modified VMOs evaluated using SEM, FTIR, XRD, XRF, surface area, and zeta potential explained the As(V) adsorption behaviour.
Medienart: |
E-Artikel |
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Erscheinungsjahr: |
2020 |
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Erschienen: |
2020 |
Enthalten in: |
Zur Gesamtaufnahme - volume:27 |
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Enthalten in: |
Environmental science and pollution research international - 27(2020), 5 vom: 18. Feb., Seite 5490-5502 |
Sprache: |
Englisch |
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Beteiligte Personen: |
Nguyen, Thi Thuc Quyen [VerfasserIn] |
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Links: |
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Anmerkungen: |
Date Completed 21.05.2020 Date Revised 10.01.2021 published: Print-Electronic Citation Status MEDLINE |
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doi: |
10.1007/s11356-019-07284-3 |
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funding: |
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Förderinstitution / Projekttitel: |
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PPN (Katalog-ID): |
NLM304545767 |
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245 | 1 | 0 | |a Removing arsenic from water with an original and modified natural manganese oxide ore |b batch kinetic and equilibrium adsorption studies |
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520 | |a Arsenic contamination of drinking water is a serious water quality problem in many parts of the world. In this study, a low-cost manganese oxide ore from Vietnam (Vietnamese manganese oxide (VMO)) was firstly evaluated for its performance in arsenate (As(V)) removal from water. This material contains both Mn (25.6%) and Fe (16.1%) mainly in the form of cryptomelane and goethite minerals. At the initial As(V) concentration of 0.5 mg/L, the adsorption capacity of original VMO determined using the Langmuir model was 0.11 mg/g. The modified VMOs produced by coating VMO with iron oxide (Fea-VMO) and zirconium oxide (Zra-VMO) at 110 °C and 550 °C achieved the highest As(V) adsorption capacity when compared to three other methods of VMO modifications. Langmuir maximum adsorption capacities of Fea-VMO and Zra-VMO at pH 7.0 were 2.19 mg/g and 1.94 mg/g, respectively, nearly twenty times higher than that of the original VMO. Batch equilibrium adsorption data fitted well to the Langmuir, Freundlich, and Temkin models and batch kinetics adsorption data to pseudo-first order, pseudo-second order, and Elovich models. The increase of pH progressively from 3 to 10 reduced As(V) adsorption with a maximum reduction of 50-60% at pH 10 for both original and modified VMOs. The co-existing oxyanions considerably weakened the As(V) removal efficiency because they competed with As(V) anions. The competition order was PO43- > SiO32- > CO32- > SO42-. The characteristics of the original and modified VMOs evaluated using SEM, FTIR, XRD, XRF, surface area, and zeta potential explained the As(V) adsorption behaviour | ||
650 | 4 | |a Journal Article | |
650 | 4 | |a Adsorption | |
650 | 4 | |a Arsenic | |
650 | 4 | |a Iron oxide and zirconium oxide modification | |
650 | 4 | |a Manganese oxide ore | |
650 | 4 | |a Water treatment | |
650 | 7 | |a Manganese Compounds |2 NLM | |
650 | 7 | |a Oxides |2 NLM | |
650 | 7 | |a Water Pollutants, Chemical |2 NLM | |
650 | 7 | |a Water |2 NLM | |
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650 | 7 | |a Arsenic |2 NLM | |
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700 | 1 | |a Loganathan, Paripurnanda |e verfasserin |4 aut | |
700 | 1 | |a Nguyen, Tien Vinh |e verfasserin |4 aut | |
700 | 1 | |a Vigneswaran, Saravanamuthu |e verfasserin |4 aut | |
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