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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Biowaste-Derived, Highly Efficient, Reusable Carbon Nanospheres for Speedy Removal of Organic Dyes from Aqueous Solutions
Subject
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adsorption; carbon nanospheres; kinetics; oil palm leaves
Description
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The current work explores the adsorptive efficiency of carbon nanospheres (CNSs) derived from oil palm leaves (OPL) that are a source of biowaste. CNSs were synthesized at 400, 600, 800 and 1000 C, and those obtained at 1000 C demonstrated maximum removal efficiency of ~91% for malachite green (MG). Physicochemical and microscopic characteristics were analysed by FESEM, TEM, FTIR, Raman, TGA and XPS studies. The presence of surface oxygen sites and the porosity of CNSs synergistically influenced the speed of removal of MG, brilliant green (BG) and Congo red (CR) dyes. With a minimal adsorbent dosage (1 mg) and minimum contact time (10 min), and under different pH conditions, adsorption was efficient and cost-effective (nearly 99, 91 and 88% for BG, MG and CR, respectively). The maximum adsorption capacities of OPL-based CNSs for BG were 500 and 104.16 mg/g for MG and 25.77 mg/g for CR. Adsorption isotherms (Freundlich, Langmuir and Temkin) and kinetics models (pseudo-first-order, pseudo-second-order and Elovich) for the adsorption processes of all three dyes on the CNSs were explored in detail. BG and CR adsorption the Freundlich isotherm best, while MG showed a best fit to the Temkin model. Adsorption kinetics of all three dyes followed a pseudo-second-order model. A reusability study was conducted to evaluate the effectiveness of CNSs in removing the MG dye and showed ~92% efficiency even after several cycles. Highly efficient CNSs with surface oxygen groups and speedy removal of organic dyes within 10 min by CNSs are highlighted in this paper. 2022 by the authors.
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Krishnappa B.; Bhat V.S.; Ancy V.; Joshi J.C.; S J.M.; Naik M.; Hegde G.
Source
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Molecules, Vol-27, No. 20
Publisher
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MDPI
Date
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2022-01-01
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<a href="https://doi.org/10.3390/molecules27207017" target="_blank" rel="noreferrer noopener">https://doi.org/10.3390/molecules27207017</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85140932303&doi=10.3390%2Fmolecules27207017&partnerID=40&md5=3939e489d0e4b744663558f67241d4a4" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85140932303&doi=10.3390%2fmolecules27207017&partnerID=40&md5=3939e489d0e4b744663558f67241d4a4</a>
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All Open Access; Gold Open Access; Green Open Access
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ISSN: 14203049; PubMed ID: 36296613; CODEN: MOLEF
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Online
Language
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English
Type
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Article
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Krishnappa B., Centre for Nano-Materials & Displays, B.M.S. College of Engineering, Bull Temple Road, Basavanagudi, Karnataka, Bengaluru, 560019, India, Department of Civil Engineering, B.M.S. College of Engineering, Bull Temple Road, Basavanagudi, Karnataka, Bengaluru, 560019, India; Bhat V.S., Centre for Nano-Materials & Displays, B.M.S. College of Engineering, Bull Temple Road, Basavanagudi, Karnataka, Bengaluru, 560019, India; Ancy V., Centre for Nano-Materials & Displays, B.M.S. College of Engineering, Bull Temple Road, Basavanagudi, Karnataka, Bengaluru, 560019, India; Joshi J.C., Centre for Nano-Materials & Displays, B.M.S. College of Engineering, Bull Temple Road, Basavanagudi, Karnataka, Bengaluru, 560019, India; S J.M., Department of Chemistry, AMC Engineering College, Bannerghatta Main Road, Karnataka, Bangalore, 560083, India; Naik M., Department of Civil Engineering, B.M.S. College of Engineering, Bull Temple Road, Basavanagudi, Karnataka, Bengaluru, 560019, India; Hegde G., Centre for Advanced Research and Development (CARD), CHRIST (Deemed to be University), Hosur Road, Karnataka, Bengaluru, 560029, India, Department of Chemistry, CHRIST (Deemed to be University), Hosur Road, Karnataka, Bengaluru, 560029, India