Chemically Dual-Modified Biochar for the Effective Removal of Cr(VI) in Solution
Here, a dual-modification strategy using KMnO<sub>4</sub> (potassium permanganate) and AlCl<sub>3</sub>·6H<sub>2</sub>O (aluminum chloride, hexahydrate) as co-modifiers to improve the Cr(VI) removal capacity of K<sub>2</sub>CO<sub>3</sub> a...
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| Format: | Article |
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MDPI AG
2021-12-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/1/39 |
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| author | Juanjuan Yang Yu Song Yan Yue Wenfei Liu Quande Che Honglei Chen Hongfang Ma |
| author_facet | Juanjuan Yang Yu Song Yan Yue Wenfei Liu Quande Che Honglei Chen Hongfang Ma |
| author_sort | Juanjuan Yang |
| collection | DOAJ |
| description | Here, a dual-modification strategy using KMnO<sub>4</sub> (potassium permanganate) and AlCl<sub>3</sub>·6H<sub>2</sub>O (aluminum chloride, hexahydrate) as co-modifiers to improve the Cr(VI) removal capacity of K<sub>2</sub>CO<sub>3</sub> activated biochar is introduced. As a result, the dual-modified biochar with KMnO<sub>4</sub> and AlCl<sub>3</sub>·6H<sub>2</sub>O has the calculated adsorption energy of −0.52 eV and −1.64 eV for HCrO<sub>4</sub><sup>−</sup>, and −0.21 eV and −2.01 eV for Cr<sub>2</sub>O<sub>7</sub><sup>2−</sup>. The Al<sub>2</sub>O<sub>3</sub> (aluminum oxide) and MnO (manganese oxide) embedded on the surface of dual-modified biochar bring more Cr(VI) absorption sites comparing to single-modified biochar, resulting in a maximum Cr(VI) saturated adsorption capacity of 152.86 mg g<sup>−</sup><sup>1</sup>. The excellent removal performance is due to the synthetic effect of electrostatic attraction, reduction reaction, complexation reaction, and physical adsorption. The experimental results also indicated that the spontaneous adsorption process agreed well with the pseudo-second order and Langmuir models. This dual-modification strategy is not limited to the treatment of Cr(VI) with biochar, and may also be incorporated with the treatment of other heavy metals in aqueous environment. |
| first_indexed | 2024-03-10T03:25:56Z |
| format | Article |
| id | doaj.art-5412be0c914d4fa791acd9c2d7ba4e76 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T03:25:56Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-5412be0c914d4fa791acd9c2d7ba4e762023-11-23T12:08:54ZengMDPI AGPolymers2073-43602021-12-011413910.3390/polym14010039Chemically Dual-Modified Biochar for the Effective Removal of Cr(VI) in SolutionJuanjuan Yang0Yu Song1Yan Yue2Wenfei Liu3Quande Che4Honglei Chen5Hongfang Ma6State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaState Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaState Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaDepartment of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USASchool of Materials Science and Engineering, University of Jinan, Jinan 250022, ChinaState Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaState Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaHere, a dual-modification strategy using KMnO<sub>4</sub> (potassium permanganate) and AlCl<sub>3</sub>·6H<sub>2</sub>O (aluminum chloride, hexahydrate) as co-modifiers to improve the Cr(VI) removal capacity of K<sub>2</sub>CO<sub>3</sub> activated biochar is introduced. As a result, the dual-modified biochar with KMnO<sub>4</sub> and AlCl<sub>3</sub>·6H<sub>2</sub>O has the calculated adsorption energy of −0.52 eV and −1.64 eV for HCrO<sub>4</sub><sup>−</sup>, and −0.21 eV and −2.01 eV for Cr<sub>2</sub>O<sub>7</sub><sup>2−</sup>. The Al<sub>2</sub>O<sub>3</sub> (aluminum oxide) and MnO (manganese oxide) embedded on the surface of dual-modified biochar bring more Cr(VI) absorption sites comparing to single-modified biochar, resulting in a maximum Cr(VI) saturated adsorption capacity of 152.86 mg g<sup>−</sup><sup>1</sup>. The excellent removal performance is due to the synthetic effect of electrostatic attraction, reduction reaction, complexation reaction, and physical adsorption. The experimental results also indicated that the spontaneous adsorption process agreed well with the pseudo-second order and Langmuir models. This dual-modification strategy is not limited to the treatment of Cr(VI) with biochar, and may also be incorporated with the treatment of other heavy metals in aqueous environment.https://www.mdpi.com/2073-4360/14/1/39biocharAl/Mn modificationCr(VI) absorptionremoval mechanismwastewater treatment |
| spellingShingle | Juanjuan Yang Yu Song Yan Yue Wenfei Liu Quande Che Honglei Chen Hongfang Ma Chemically Dual-Modified Biochar for the Effective Removal of Cr(VI) in Solution Polymers biochar Al/Mn modification Cr(VI) absorption removal mechanism wastewater treatment |
| title | Chemically Dual-Modified Biochar for the Effective Removal of Cr(VI) in Solution |
| title_full | Chemically Dual-Modified Biochar for the Effective Removal of Cr(VI) in Solution |
| title_fullStr | Chemically Dual-Modified Biochar for the Effective Removal of Cr(VI) in Solution |
| title_full_unstemmed | Chemically Dual-Modified Biochar for the Effective Removal of Cr(VI) in Solution |
| title_short | Chemically Dual-Modified Biochar for the Effective Removal of Cr(VI) in Solution |
| title_sort | chemically dual modified biochar for the effective removal of cr vi in solution |
| topic | biochar Al/Mn modification Cr(VI) absorption removal mechanism wastewater treatment |
| url | https://www.mdpi.com/2073-4360/14/1/39 |
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