The Role of Carboxyl and Hydroxyl Groups of Humic Acid in Removing AuCl<sub>4</sub><sup>-</sup> from Aqueous Solution
Humic acid (HA) extracted from peat soil according to the recommended procedure of the International Humic Substances Society (IHSS) has been tested to remove AuCl4- from aqueous solution. The removal was optimum at pH 2.0 and it was mainly dictated by attachment through hydrogen bonding to unionize...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Department of Chemistry, Universitas Gadjah Mada
2017-04-01
|
| Series: | Indonesian Journal of Chemistry |
| Subjects: | |
| Online Access: | https://jurnal.ugm.ac.id/ijc/article/view/23620 |
| _version_ | 1818824206197981184 |
|---|---|
| author | Sri Sudiono Mustika Yuniarti Dwi Siswanta Eko Sri Kunarti Triyono Triyono Sri Juari Santosa |
| author_facet | Sri Sudiono Mustika Yuniarti Dwi Siswanta Eko Sri Kunarti Triyono Triyono Sri Juari Santosa |
| author_sort | Sri Sudiono |
| collection | DOAJ |
| description | Humic acid (HA) extracted from peat soil according to the recommended procedure of the International Humic Substances Society (IHSS) has been tested to remove AuCl4- from aqueous solution. The removal was optimum at pH 2.0 and it was mainly dictated by attachment through hydrogen bonding to unionized carboxyl (–COOH) groups and reduction by the action of the hydroxyl (–OH) groups to gold (Au) metal. The removal of AuCl4- improved after HA was purified through repeated immersion and shaking in a mixed solution containing 0.1 M HCl and 0.3 M HF. When the purification led to the sharp decrease in ash content from 39.34 to 0.85% (w/w) and significant increase in both the –COOH and –OH contents from 3240 to 3487 mmol/kg and from 4260 to 4620 mmol/kg, respectively; the removal of AuCl4- improved from 0.105 to 0.133 mmol/g. This improvement of AuCl4- removal by the purified HA was accompanied by higher ability in reduction to Au metal. The attached AuCl4- on –COOH groups of both crude and purified HAs was qualitatively observed by the characterization result of FT-IR spectroscopy, while the presence of Au metal on the surface of those HAs was verified by the characterization result of XRD. |
| first_indexed | 2024-12-18T23:52:11Z |
| format | Article |
| id | doaj.art-514ea988a7fe49b1a0e5ce55c3e392db |
| institution | Directory Open Access Journal |
| issn | 1411-9420 2460-1578 |
| language | English |
| last_indexed | 2024-12-18T23:52:11Z |
| publishDate | 2017-04-01 |
| publisher | Department of Chemistry, Universitas Gadjah Mada |
| record_format | Article |
| series | Indonesian Journal of Chemistry |
| spelling | doaj.art-514ea988a7fe49b1a0e5ce55c3e392db2022-12-21T20:46:53ZengDepartment of Chemistry, Universitas Gadjah MadaIndonesian Journal of Chemistry1411-94202460-15782017-04-011719510410.22146/ijc.2362015966The Role of Carboxyl and Hydroxyl Groups of Humic Acid in Removing AuCl<sub>4</sub><sup>-</sup> from Aqueous SolutionSri Sudiono0Mustika Yuniarti1Dwi Siswanta2Eko Sri Kunarti3Triyono Triyono4Sri Juari Santosa5Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281Humic acid (HA) extracted from peat soil according to the recommended procedure of the International Humic Substances Society (IHSS) has been tested to remove AuCl4- from aqueous solution. The removal was optimum at pH 2.0 and it was mainly dictated by attachment through hydrogen bonding to unionized carboxyl (–COOH) groups and reduction by the action of the hydroxyl (–OH) groups to gold (Au) metal. The removal of AuCl4- improved after HA was purified through repeated immersion and shaking in a mixed solution containing 0.1 M HCl and 0.3 M HF. When the purification led to the sharp decrease in ash content from 39.34 to 0.85% (w/w) and significant increase in both the –COOH and –OH contents from 3240 to 3487 mmol/kg and from 4260 to 4620 mmol/kg, respectively; the removal of AuCl4- improved from 0.105 to 0.133 mmol/g. This improvement of AuCl4- removal by the purified HA was accompanied by higher ability in reduction to Au metal. The attached AuCl4- on –COOH groups of both crude and purified HAs was qualitatively observed by the characterization result of FT-IR spectroscopy, while the presence of Au metal on the surface of those HAs was verified by the characterization result of XRD.https://jurnal.ugm.ac.id/ijc/article/view/23620Humic acidcarboxyl grouphydroxyl groupAuCl4-removal |
| spellingShingle | Sri Sudiono Mustika Yuniarti Dwi Siswanta Eko Sri Kunarti Triyono Triyono Sri Juari Santosa The Role of Carboxyl and Hydroxyl Groups of Humic Acid in Removing AuCl<sub>4</sub><sup>-</sup> from Aqueous Solution Indonesian Journal of Chemistry Humic acid carboxyl group hydroxyl group AuCl4- removal |
| title | The Role of Carboxyl and Hydroxyl Groups of Humic Acid in Removing AuCl<sub>4</sub><sup>-</sup> from Aqueous Solution |
| title_full | The Role of Carboxyl and Hydroxyl Groups of Humic Acid in Removing AuCl<sub>4</sub><sup>-</sup> from Aqueous Solution |
| title_fullStr | The Role of Carboxyl and Hydroxyl Groups of Humic Acid in Removing AuCl<sub>4</sub><sup>-</sup> from Aqueous Solution |
| title_full_unstemmed | The Role of Carboxyl and Hydroxyl Groups of Humic Acid in Removing AuCl<sub>4</sub><sup>-</sup> from Aqueous Solution |
| title_short | The Role of Carboxyl and Hydroxyl Groups of Humic Acid in Removing AuCl<sub>4</sub><sup>-</sup> from Aqueous Solution |
| title_sort | role of carboxyl and hydroxyl groups of humic acid in removing aucl sub 4 sub sup sup from aqueous solution |
| topic | Humic acid carboxyl group hydroxyl group AuCl4- removal |
| url | https://jurnal.ugm.ac.id/ijc/article/view/23620 |
| work_keys_str_mv | AT srisudiono theroleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution AT mustikayuniarti theroleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution AT dwisiswanta theroleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution AT ekosrikunarti theroleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution AT triyonotriyono theroleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution AT srijuarisantosa theroleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution AT srisudiono roleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution AT mustikayuniarti roleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution AT dwisiswanta roleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution AT ekosrikunarti roleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution AT triyonotriyono roleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution AT srijuarisantosa roleofcarboxylandhydroxylgroupsofhumicacidinremovingauclsub4subsupsupfromaqueoussolution |