Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparison
The capacity and underlying mechanism of hydrochars derived from commercial D -glucose and wasted orange peels (designated as pristine-hydrochars) and further modified with nitric acid (designated as oxidized-hydrochars) to adsorb methylene blue were investigated. Both pristine- and oxidized-hydroch...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2019-10-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1177/0263617419867519 |
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| _version_ | 1832544703299452928 |
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| author | Duy H Nguyen Hai Nguyen Tran Huan-Ping Chao Chu-Ching Lin |
| author_facet | Duy H Nguyen Hai Nguyen Tran Huan-Ping Chao Chu-Ching Lin |
| author_sort | Duy H Nguyen |
| collection | DOAJ |
| description | The capacity and underlying mechanism of hydrochars derived from commercial D -glucose and wasted orange peels (designated as pristine-hydrochars) and further modified with nitric acid (designated as oxidized-hydrochars) to adsorb methylene blue were investigated. Both pristine- and oxidized-hydrochars were characterized by scanning electron microscopy, Brunauer–Emmet–Teller-specific surface area, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and mass titration. The maximum methylene blue adsorption capacity at 30°C estimated by the Langmuir model was found to follow the order: mGH (246 mg/g) > mOPH (107 mg/g) > OPH (59.6 mg/g) > GH (54.8 mg/g). Six adsorption mechanisms were elucidated, in which the electrostatic interaction and hydrogen bonding were identified as the primary methylene blue-hydrochar adsorptive interaction; furthermore, because the nitric acid modification process enhanced oxygen- and nitrogen-containing functional groups and unsaturated bonds on the surface of oxidized-hydrochars, the π – π and n – π interaction became minor pathways for methylene blue adsorption onto oxidized-hydrochars. Our results suggest that modified hydrochars could be used as environmentally friendly adsorbents alternative to activated carbon in dealing with methylene blue contamination in aqueous solutions. |
| format | Article |
| id | doaj-art-9e0085e93fdb4a6fa4ece2c1d2b01e75 |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2019-10-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-9e0085e93fdb4a6fa4ece2c1d2b01e752025-02-03T10:07:22ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382019-10-013710.1177/0263617419867519Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparisonDuy H NguyenHai Nguyen TranHuan-Ping ChaoChu-Ching LinThe capacity and underlying mechanism of hydrochars derived from commercial D -glucose and wasted orange peels (designated as pristine-hydrochars) and further modified with nitric acid (designated as oxidized-hydrochars) to adsorb methylene blue were investigated. Both pristine- and oxidized-hydrochars were characterized by scanning electron microscopy, Brunauer–Emmet–Teller-specific surface area, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and mass titration. The maximum methylene blue adsorption capacity at 30°C estimated by the Langmuir model was found to follow the order: mGH (246 mg/g) > mOPH (107 mg/g) > OPH (59.6 mg/g) > GH (54.8 mg/g). Six adsorption mechanisms were elucidated, in which the electrostatic interaction and hydrogen bonding were identified as the primary methylene blue-hydrochar adsorptive interaction; furthermore, because the nitric acid modification process enhanced oxygen- and nitrogen-containing functional groups and unsaturated bonds on the surface of oxidized-hydrochars, the π – π and n – π interaction became minor pathways for methylene blue adsorption onto oxidized-hydrochars. Our results suggest that modified hydrochars could be used as environmentally friendly adsorbents alternative to activated carbon in dealing with methylene blue contamination in aqueous solutions.https://doi.org/10.1177/0263617419867519 |
| spellingShingle | Duy H Nguyen Hai Nguyen Tran Huan-Ping Chao Chu-Ching Lin Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparison Adsorption Science & Technology |
| title | Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparison |
| title_full | Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparison |
| title_fullStr | Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparison |
| title_full_unstemmed | Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparison |
| title_short | Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparison |
| title_sort | effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue an adsorption mechanism comparison |
| url | https://doi.org/10.1177/0263617419867519 |
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