Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations
Biochar can retain large amounts of protons and metals in the drainage water from acid sulfate soils and mine sites. Metal sorption can, however, be influenced by many factors, such as pH and metal composition. This study investigated proton, Al, and Fe retention capacity of eucalyptus biochar (1% w...
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| Format: | Article |
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MDPI AG
2018-01-01
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| Series: | Water |
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| Online Access: | http://www.mdpi.com/2073-4441/10/1/55 |
| _version_ | 1811259570245337088 |
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| author | Tan Dang Petra Marschner Rob Fitzpatrick Luke M. Mosley |
| author_facet | Tan Dang Petra Marschner Rob Fitzpatrick Luke M. Mosley |
| author_sort | Tan Dang |
| collection | DOAJ |
| description | Biochar can retain large amounts of protons and metals in the drainage water from acid sulfate soils and mine sites. Metal sorption can, however, be influenced by many factors, such as pH and metal composition. This study investigated proton, Al, and Fe retention capacity of eucalyptus biochar (1% w/v) at different pH and metal concentrations. In the absence of metals, the biochar had a high proton binding capacity, (up to 0.035 mmol of H+), whereas its capacity to retain hydroxide ions was limited. A batch experiment was carried out at pH 4 and pH 7 with 10−6, 10−5, 10−4, 10−3, and 10−2 M of added Fe or Al. Added metals precipitated considerably prior to addition of the biochar except that Al remained highly soluble at pH 4. The biochar had a high retention capacity for Al and Fe; at high (>1 mM) concentrations, over 80% of soluble metals were retained. Metal competition for binding sites of both Al and Fe at different ratios was investigated, but increasing concentrations of one metal did not reduce retention of the other. The results confirmed that biochar has high metal binding capacity under both acidic and neutral conditions. |
| first_indexed | 2024-04-12T18:33:36Z |
| format | Article |
| id | doaj.art-0539b92ed8e54b3ebce329f14d6c7f70 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-04-12T18:33:36Z |
| publishDate | 2018-01-01 |
| publisher | MDPI AG |
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| series | Water |
| spelling | doaj.art-0539b92ed8e54b3ebce329f14d6c7f702022-12-22T03:21:00ZengMDPI AGWater2073-44412018-01-011015510.3390/w10010055w10010055Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal ConcentrationsTan Dang0Petra Marschner1Rob Fitzpatrick2Luke M. Mosley3Acid Sulfate Soils Centre, The University of Adelaide, Adelaide, SA 5005, AustraliaSchool of Agriculture, Food and Wine, The University of Adelaide, Adelaide, SA 5005, AustraliaAcid Sulfate Soils Centre, The University of Adelaide, Adelaide, SA 5005, AustraliaAcid Sulfate Soils Centre, The University of Adelaide, Adelaide, SA 5005, AustraliaBiochar can retain large amounts of protons and metals in the drainage water from acid sulfate soils and mine sites. Metal sorption can, however, be influenced by many factors, such as pH and metal composition. This study investigated proton, Al, and Fe retention capacity of eucalyptus biochar (1% w/v) at different pH and metal concentrations. In the absence of metals, the biochar had a high proton binding capacity, (up to 0.035 mmol of H+), whereas its capacity to retain hydroxide ions was limited. A batch experiment was carried out at pH 4 and pH 7 with 10−6, 10−5, 10−4, 10−3, and 10−2 M of added Fe or Al. Added metals precipitated considerably prior to addition of the biochar except that Al remained highly soluble at pH 4. The biochar had a high retention capacity for Al and Fe; at high (>1 mM) concentrations, over 80% of soluble metals were retained. Metal competition for binding sites of both Al and Fe at different ratios was investigated, but increasing concentrations of one metal did not reduce retention of the other. The results confirmed that biochar has high metal binding capacity under both acidic and neutral conditions.http://www.mdpi.com/2073-4441/10/1/55biocharacid sulfate soilprotonmetal binding |
| spellingShingle | Tan Dang Petra Marschner Rob Fitzpatrick Luke M. Mosley Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations Water biochar acid sulfate soil proton metal binding |
| title | Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations |
| title_full | Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations |
| title_fullStr | Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations |
| title_full_unstemmed | Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations |
| title_short | Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations |
| title_sort | assessment of the binding of protons al and fe to biochar at different ph values and soluble metal concentrations |
| topic | biochar acid sulfate soil proton metal binding |
| url | http://www.mdpi.com/2073-4441/10/1/55 |
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