Harnessing sustainable N-doped activated carbon from walnut shells for advanced all-solid-state supercapacitors and targeted Rhodamine B dye adsorption
This research introduces a novel approach to repurposing walnut shells, an abundant agricultural waste, to synthesize sustainable nitrogen-doped activated carbon (N@AC). The resulting material exhibits remarkable properties suitable for dual applications in high-performance all-solid-state supercapa...
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Elsevier B.V.
2025
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| author | Husain A. Ansari K. Mahajan D.K. Kandasamy M. Ansari M.N.M. Giri J. Al-Lohedan H.A. |
| author2 | 57215031715 |
| author_facet | 57215031715 Husain A. Ansari K. Mahajan D.K. Kandasamy M. Ansari M.N.M. Giri J. Al-Lohedan H.A. |
| author_sort | Husain A. |
| building | UNITEN Library |
| collection | Institutional Repository |
| content_provider | Universiti Tenaga Nasional |
| content_source | UNITEN Institutional Repository |
| continent | Asia |
| country | Malaysia |
| description | This research introduces a novel approach to repurposing walnut shells, an abundant agricultural waste, to synthesize sustainable nitrogen-doped activated carbon (N@AC). The resulting material exhibits remarkable properties suitable for dual applications in high-performance all-solid-state supercapacitors and efficient Rhodamine B dye (RhB) adsorption. In a three-electrode setup, the N@AC electrode exhibits an impressive specific capacitance of 484.6 Fg?1 at 1 Ag?1 and remarkable long-term stability, maintaining 97.4% of its initial performance even after 5000 charge-discharge cycles. Simultaneously, the all-solid-state symmetric supercapacitor configuration (N@AC//N@AC) demonstrates outstanding specific capacitance, registering at 168.8 Fg?1 at 1 Ag?1, accompanied by a favourable rate capability of 67.3% at 10 Ag?1. Notably, the N@AC//N@AC configuration attains a high energy density of 39.8 WhKg?1 at 1 Ag?1. Furthermore, N@AC//N@AC exhibits favourable cyclic stability, retaining 83.91% of its initial capacitance even after 10,000 charge-discharge cycles. Moreover, the adsorption efficiency of N@AC toward RhB is scrutinized, highlighting its efficacy in addressing environmental remediation challenges. The porous architecture and nitrogen functionalities of N@AC play a crucial role in expeditiously eliminating organic pollutants from aqueous solutions, offering a sustainable approach to treating wastewater. Optimal conditions for the highest RhB adsorption are identified: pH 7.2, a contact duration of 180 min, and an initial dye concentration of 20 mgL?1. Thermodynamic evaluations, encompassing the determination of ?H?, ?H?, and ?S?, signify the endothermic and spontaneous nature of the adsorption process. In desorption investigations, it is noted that H2O, employed as an eluting agent, proficiently releases 87.35% of the adsorbed RhB dye. ? 2024 Vietnam National University, Hanoi |
| format | Article |
| id | my.uniten.dspace-36580 |
| institution | Universiti Tenaga Nasional |
| publishDate | 2025 |
| publisher | Elsevier B.V. |
| record_format | dspace |
| spelling | my.uniten.dspace-365802025-03-03T15:43:12Z Harnessing sustainable N-doped activated carbon from walnut shells for advanced all-solid-state supercapacitors and targeted Rhodamine B dye adsorption Husain A. Ansari K. Mahajan D.K. Kandasamy M. Ansari M.N.M. Giri J. Al-Lohedan H.A. 57215031715 57217021684 8712400500 57052581200 55489853600 57198345558 6507079738 This research introduces a novel approach to repurposing walnut shells, an abundant agricultural waste, to synthesize sustainable nitrogen-doped activated carbon (N@AC). The resulting material exhibits remarkable properties suitable for dual applications in high-performance all-solid-state supercapacitors and efficient Rhodamine B dye (RhB) adsorption. In a three-electrode setup, the N@AC electrode exhibits an impressive specific capacitance of 484.6 Fg?1 at 1 Ag?1 and remarkable long-term stability, maintaining 97.4% of its initial performance even after 5000 charge-discharge cycles. Simultaneously, the all-solid-state symmetric supercapacitor configuration (N@AC//N@AC) demonstrates outstanding specific capacitance, registering at 168.8 Fg?1 at 1 Ag?1, accompanied by a favourable rate capability of 67.3% at 10 Ag?1. Notably, the N@AC//N@AC configuration attains a high energy density of 39.8 WhKg?1 at 1 Ag?1. Furthermore, N@AC//N@AC exhibits favourable cyclic stability, retaining 83.91% of its initial capacitance even after 10,000 charge-discharge cycles. Moreover, the adsorption efficiency of N@AC toward RhB is scrutinized, highlighting its efficacy in addressing environmental remediation challenges. The porous architecture and nitrogen functionalities of N@AC play a crucial role in expeditiously eliminating organic pollutants from aqueous solutions, offering a sustainable approach to treating wastewater. Optimal conditions for the highest RhB adsorption are identified: pH 7.2, a contact duration of 180 min, and an initial dye concentration of 20 mgL?1. Thermodynamic evaluations, encompassing the determination of ?H?, ?H?, and ?S?, signify the endothermic and spontaneous nature of the adsorption process. In desorption investigations, it is noted that H2O, employed as an eluting agent, proficiently releases 87.35% of the adsorbed RhB dye. ? 2024 Vietnam National University, Hanoi Final 2025-03-03T07:43:12Z 2025-03-03T07:43:12Z 2024 Article 10.1016/j.jsamd.2024.100699 2-s2.0-85187020526 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85187020526&doi=10.1016%2fj.jsamd.2024.100699&partnerID=40&md5=e6e83f41e7ece48fa13279fefcaac448 https://irepository.uniten.edu.my/handle/123456789/36580 9 2 100699 All Open Access; Gold Open Access Elsevier B.V. Scopus |
| spellingShingle | Husain A. Ansari K. Mahajan D.K. Kandasamy M. Ansari M.N.M. Giri J. Al-Lohedan H.A. Harnessing sustainable N-doped activated carbon from walnut shells for advanced all-solid-state supercapacitors and targeted Rhodamine B dye adsorption |
| title | Harnessing sustainable N-doped activated carbon from walnut shells for advanced all-solid-state supercapacitors and targeted Rhodamine B dye adsorption |
| title_full | Harnessing sustainable N-doped activated carbon from walnut shells for advanced all-solid-state supercapacitors and targeted Rhodamine B dye adsorption |
| title_fullStr | Harnessing sustainable N-doped activated carbon from walnut shells for advanced all-solid-state supercapacitors and targeted Rhodamine B dye adsorption |
| title_full_unstemmed | Harnessing sustainable N-doped activated carbon from walnut shells for advanced all-solid-state supercapacitors and targeted Rhodamine B dye adsorption |
| title_short | Harnessing sustainable N-doped activated carbon from walnut shells for advanced all-solid-state supercapacitors and targeted Rhodamine B dye adsorption |
| title_sort | harnessing sustainable n-doped activated carbon from walnut shells for advanced all-solid-state supercapacitors and targeted rhodamine b dye adsorption |
| url_provider | http://dspace.uniten.edu.my/ |