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Duarte MP, Adeola AO, Fuoco G, Jargaille TJ, Naccache R. Efficient Decaffeination with Recyclable Magnetic Microporous Carbon from Renewable Sources: Kinetics and Isotherm Analysis. ENVIRONMENTAL RESEARCH 2024; 258:119446. [PMID: 38909946 DOI: 10.1016/j.envres.2024.119446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 06/11/2024] [Accepted: 06/18/2024] [Indexed: 06/25/2024]
Abstract
Rapid global urbanization and population growth have ignited an alarming surge in emerging contaminants in water bodies, posing health risks, even at trace concentrations. To address this challenge, novel water treatment and reuse technologies are required as current treatment systems are associated with high costs and energy requirements. These drawbacks provide additional incentives for the application of cost-effective and sustainable biomass-derived activated carbon, which possesses high surface area and low toxicity. Herein, we synthesized microporous activated carbon (MAC) and its magnetic derivative (m-MAC) from tannic acid to decaffeinate contaminated aqueous solutions. Detailed characterization using SEM, BET, and PXRD revealed a very high surface area (>1800 m2/g) and a highly porous, amorphous, heterogeneous sponge-like structure. Physicochemical and thermal analyses using XPS, TGA, and EDS confirmed thermal stability, unique surface moieties, and homogeneous elemental distribution. High absorption performance (>96 %) and adsorption capacity (287 and 394 mg/g) were recorded for m-MAC and MAC, respectively. Mechanistic studies showed that the sorption of caffeine is in tandem with multilayer and chemisorptive mechanisms, considering the models' correlation and error coefficients. π-π stacking and hydrogen bonding were among the interactions that could facilitate MAC-Caffeine and m-MAC-Caffeine bonding interactions. Regeneration and reusability experiments revealed adsorption efficiency ranging from 90.5-98.4 % for MAC and 88.6-93.7 % for m-MAC for five cycles. Our findings suggest that MAC and its magnetic derivative are effective for caffeine removal, and potentially other organic contaminants with the possibility of developing commercially viable and cost-effective water polishing tools.
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Affiliation(s)
- Michelle P Duarte
- Department of Chemistry and Biochemistry and the Centre for NanoScience Research, Concordia University, Montreal, QC, H4B 1R6, Canada; Quebec Centre for Advanced Materials, Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, H4B 1R6, Canada
| | - Adedapo O Adeola
- Department of Chemistry and Biochemistry and the Centre for NanoScience Research, Concordia University, Montreal, QC, H4B 1R6, Canada; Quebec Centre for Advanced Materials, Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, H4B 1R6, Canada.
| | - Gianluca Fuoco
- Department of Chemistry and Biochemistry and the Centre for NanoScience Research, Concordia University, Montreal, QC, H4B 1R6, Canada; Quebec Centre for Advanced Materials, Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, H4B 1R6, Canada
| | - Tyler J Jargaille
- Department of Chemistry and Biochemistry and the Centre for NanoScience Research, Concordia University, Montreal, QC, H4B 1R6, Canada; Quebec Centre for Advanced Materials, Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, H4B 1R6, Canada
| | - Rafik Naccache
- Department of Chemistry and Biochemistry and the Centre for NanoScience Research, Concordia University, Montreal, QC, H4B 1R6, Canada; Quebec Centre for Advanced Materials, Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, H4B 1R6, Canada.
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Zhang C, Ying Z, Jiang Y, Wang H, Zhou X, Xuan W, Zheng P. Solvent-controlled synthesis of hydrophilic and hydrophobic carbon dots. Phys Chem Chem Phys 2023; 26:314-322. [PMID: 38062935 DOI: 10.1039/d3cp04273a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Hydrophilicity and hydrophobicity are of paramount importance in surface chemistry. In this study, a solvent-controlled synthesis of hydrophilic and hydrophobic carbon dots (CDs) was prepared via a solvothermal process using pentafluorobenzyl alcohol as the carbon source in either deionized water or N,N-dimethylformamide (DMF) medium. By simply varying the reaction solvent to control the doping of nitrogen and fluorine elements, the hydrophilicity or hydrophobicity of the CDs could be regulated. Hydrophobic and hydrophilic CDs showed blue and green light under a UV lamp, respectively. Besides, we regulated the volume ratio of water/DMF (1 : 2, 1 : 1 and 2 : 1) in the reaction solvent to prepare amphiphilic CDs and further studied their hydrophilicity and hydrophobicity. Furthermore, the sensitivity of hydrophobic CDs to water was investigated. In water detection, the photoluminescent intensity of the blue peak and green peak showed high linearity within the water content of 4-80% and 10-80%, respectively (limit of detection = 0.08%, v/v, in DMF).
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Affiliation(s)
- Chenhan Zhang
- Laboratory for Nanoelectronics and NanoDevices, School of Electronic Information, Hangzhou Dianzi University, Hangzhou, 310018, China.
| | - Zhihua Ying
- Laboratory for Nanoelectronics and NanoDevices, School of Electronic Information, Hangzhou Dianzi University, Hangzhou, 310018, China.
| | - Yuan Jiang
- Laboratory for Nanoelectronics and NanoDevices, School of Electronic Information, Hangzhou Dianzi University, Hangzhou, 310018, China.
| | - Haiyang Wang
- Laboratory for Nanoelectronics and NanoDevices, School of Electronic Information, Hangzhou Dianzi University, Hangzhou, 310018, China.
| | - Xuebin Zhou
- Laboratory for Nanoelectronics and NanoDevices, School of Electronic Information, Hangzhou Dianzi University, Hangzhou, 310018, China.
| | - Weipeng Xuan
- Laboratory for Nanoelectronics and NanoDevices, School of Electronic Information, Hangzhou Dianzi University, Hangzhou, 310018, China.
| | - Peng Zheng
- Laboratory for Nanoelectronics and NanoDevices, School of Electronic Information, Hangzhou Dianzi University, Hangzhou, 310018, China.
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