Research on the Adsorption Mechanism and Performance of Cotton Stalk-Based Biochar
In this research, we produced two types of biochar (BC) using cotton stalks as raw material and KOH as an activator, and compared their performance and adsorption mechanisms in the removal of tetracycline (TC) and methylene blue (MB) from wastewater. The results showed that the biochar generated usi...
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2024-12-01
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| author | Qiushuang Cui Yong Huang Xufei Ma Sining Li Ruyun Bai Huan Li Wen Liu Hanyu Wei |
| author_facet | Qiushuang Cui Yong Huang Xufei Ma Sining Li Ruyun Bai Huan Li Wen Liu Hanyu Wei |
| author_sort | Qiushuang Cui |
| collection | DOAJ |
| description | In this research, we produced two types of biochar (BC) using cotton stalks as raw material and KOH as an activator, and compared their performance and adsorption mechanisms in the removal of tetracycline (TC) and methylene blue (MB) from wastewater. The results showed that the biochar generated using both procedures formed pores that connected to the interior of the biochar and had extensive microporous and mesoporous structures. The molten salt approach produces biochar with a higher specific surface area, larger pore size, and higher pore volume than the impregnation method, with a maximum specific surface area of 3095 m<sup>2</sup>/g. KBCM-900 (the BC produced using the molten salt method at 900 °C) had a better adsorption effect on TC, with a clearance rate of more than 95% in 180 min and a maximum adsorption amount of 912.212 mg/g. The adsorption rates of the two BCs for MB did not differ significantly at low concentrations, but as the concentration increased, KBCI-900 (the BC generated by the impregnation method at 900 °C) exhibited better adsorption, with a maximum adsorption of 723.726 mg/g. The pseudo-second-order kinetic model and the Langmuir isotherm model may accurately describe the TC and MB adsorption processes of KBCI-900 and KBCM-900. The KBCI/KBCM-900 adsorption process combines physical and chemical adsorption, with the primary mechanisms being pore filling, π–π interactions, hydrogen bonding, and electrostatic interactions. As a result, biochar generated using the molten salt method is suitable for the removal of large-molecule pollutants such as TC, whereas biochar prepared using the impregnation method is suitable for the removal of small-molecule dyes such as MB. |
| format | Article |
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| institution | Kabale University |
| issn | 1420-3049 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj-art-5f35e9c5af0d441ca658312e2e3f2c7c2024-12-27T14:42:25ZengMDPI AGMolecules1420-30492024-12-012924584110.3390/molecules29245841Research on the Adsorption Mechanism and Performance of Cotton Stalk-Based BiocharQiushuang Cui0Yong Huang1Xufei Ma2Sining Li3Ruyun Bai4Huan Li5Wen Liu6Hanyu Wei7State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, ChinaState Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, ChinaDepartment of Chemistry and Applied Chemistry, Changji University, Changji 831110, ChinaState Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, ChinaState Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, ChinaState Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, ChinaState Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, ChinaState Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, ChinaIn this research, we produced two types of biochar (BC) using cotton stalks as raw material and KOH as an activator, and compared their performance and adsorption mechanisms in the removal of tetracycline (TC) and methylene blue (MB) from wastewater. The results showed that the biochar generated using both procedures formed pores that connected to the interior of the biochar and had extensive microporous and mesoporous structures. The molten salt approach produces biochar with a higher specific surface area, larger pore size, and higher pore volume than the impregnation method, with a maximum specific surface area of 3095 m<sup>2</sup>/g. KBCM-900 (the BC produced using the molten salt method at 900 °C) had a better adsorption effect on TC, with a clearance rate of more than 95% in 180 min and a maximum adsorption amount of 912.212 mg/g. The adsorption rates of the two BCs for MB did not differ significantly at low concentrations, but as the concentration increased, KBCI-900 (the BC generated by the impregnation method at 900 °C) exhibited better adsorption, with a maximum adsorption of 723.726 mg/g. The pseudo-second-order kinetic model and the Langmuir isotherm model may accurately describe the TC and MB adsorption processes of KBCI-900 and KBCM-900. The KBCI/KBCM-900 adsorption process combines physical and chemical adsorption, with the primary mechanisms being pore filling, π–π interactions, hydrogen bonding, and electrostatic interactions. As a result, biochar generated using the molten salt method is suitable for the removal of large-molecule pollutants such as TC, whereas biochar prepared using the impregnation method is suitable for the removal of small-molecule dyes such as MB.https://www.mdpi.com/1420-3049/29/24/5841methylene bluetetracyclinebiocharadsorptionKOH modification |
| spellingShingle | Qiushuang Cui Yong Huang Xufei Ma Sining Li Ruyun Bai Huan Li Wen Liu Hanyu Wei Research on the Adsorption Mechanism and Performance of Cotton Stalk-Based Biochar Molecules methylene blue tetracycline biochar adsorption KOH modification |
| title | Research on the Adsorption Mechanism and Performance of Cotton Stalk-Based Biochar |
| title_full | Research on the Adsorption Mechanism and Performance of Cotton Stalk-Based Biochar |
| title_fullStr | Research on the Adsorption Mechanism and Performance of Cotton Stalk-Based Biochar |
| title_full_unstemmed | Research on the Adsorption Mechanism and Performance of Cotton Stalk-Based Biochar |
| title_short | Research on the Adsorption Mechanism and Performance of Cotton Stalk-Based Biochar |
| title_sort | research on the adsorption mechanism and performance of cotton stalk based biochar |
| topic | methylene blue tetracycline biochar adsorption KOH modification |
| url | https://www.mdpi.com/1420-3049/29/24/5841 |
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