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Abeysinghe H, Wickramasinghe G, Perera S, Etampawala T. MWCNT Buckypaper as Electrochemical Sensing Platform: A Rapid Detection Technology for Phthalic Acid Esters in Solutions*. ChemistrySelect 2022. [DOI: 10.1002/slct.202201900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hansini Abeysinghe
- Department of Polymer Science Faculty of Applied Sciences University of Sri Jayewardenepura, Gangodawila Nugegoda 10250 Sri Lanka
| | - Gimhani Wickramasinghe
- Department of Physics Faculty of Natural Sciences Open University of Sri Lanka, Nawala Nugegoda 11222 Sri Lanka
| | - Susira Perera
- Department of Physics Faculty of Natural Sciences Open University of Sri Lanka, Nawala Nugegoda 11222 Sri Lanka
| | - Thusitha Etampawala
- Department of Polymer Science Faculty of Applied Sciences University of Sri Jayewardenepura, Gangodawila Nugegoda 10250 Sri Lanka
- Center for Advanced Material Research (CAMR) Faculty of Applied Sciences University of Sri Jayewardenepura, Gangodawila Nugegoda 10250 Sri Lanka
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De Silva T, Damery C, Alkhaldi R, Karunanithy R, Gallaba DH, Patil PD, Wasala M, Sivakumar P, Migone A, Talapatra S. Carbon Nanotube Based Robust and Flexible Solid-State Supercapacitor. ACS APPLIED MATERIALS & INTERFACES 2021; 13:56004-56013. [PMID: 34792349 DOI: 10.1021/acsami.1c12551] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
All solid-state flexible electrochemical double-layer capacitors (EDLCs) are crucial for providing energy options in a variety of applications, ranging from wearable electronics to bendable micro/nanotechnology. Here, we report on the development of robust EDLCs using aligned multiwalled carbon nanotubes (MWCNTs) grown directly on thin metal foils embedded in a poly(vinyl alcohol)/phosphoric acid (PVA/H3PO4) polymer gel. The thin metal substrate holding the aligned MWCNT assembly provides mechanical robustness and the PVA/H3PO4 polymer gel, functioning both as the electrolyte as well as the separator, provides sufficient structural flexibility, without any loss of charge storage capacity under flexed conditions. The performance stability of these devices was verified by testing them under straight and bent formations. A high value of the areal specific capacitance (CSP) of ∼14.5 mF cm-2 with an energy density of ∼1 μW h cm-2 can be obtained in these devices. These values are significantly higher (in some cases, orders of magnitude) than several graphene as well as single-walled nanotube-based EDLC's utilizing similar electrolytes. We further show that these devices can withstand multiple (∼2500) mechanical bending cycles, without losing their energy storage capacities and are functional within the temperature range of 20 to 70 °C. Several strategies for enhancing the capacitive charge storage, such as physically stacking (in parallel) individual devices, or postproduction thermal annealing of electrodes, are also demonstrated. These findings demonstrated in this article provide tremendous impetus toward the realization of robust, stackable, and flexible all solid-state supercapacitors.
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Affiliation(s)
- Thushani De Silva
- Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Cole Damery
- Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Rana Alkhaldi
- Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Robinson Karunanithy
- Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Dinuka H Gallaba
- Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Prasanna D Patil
- Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Milinda Wasala
- Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Poopalasingam Sivakumar
- Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Aldo Migone
- Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Saikat Talapatra
- Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, United States
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De Luca P, Siciliano C, Macario A, Nagy JB. The Role of Carbon Nanotube Pretreatments in the Adsorption of Benzoic Acid. MATERIALS 2021; 14:ma14092118. [PMID: 33922057 PMCID: PMC8122370 DOI: 10.3390/ma14092118] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 04/17/2021] [Accepted: 04/20/2021] [Indexed: 12/15/2022]
Abstract
Four different types of multi-walled carbon nanotubes (MWCNTs) were used and compared for the treatment of benzoic acid contaminated water. The types of nanotubes used were: (1) non-purified (CNTsUP), as made; (2) purified (CNTsP), not containing the catalyst; (3) oxidized (CNTsOX), characterized by the presence of groups such as, –COOH; (4) calcined (CNTs900), with elimination of interactions between nanotubes. In addition, activated carbon was also used to allow for later comparison. The adsorption tests were conducted on an aqueous solution of benzoic acid at concentration of 20 mg/L, as a model of carboxylated aromatic compounds. After the adsorption tests, the residual benzoic acid concentrations were measured by UV-visible spectrometry, while the carbon nanotubes were characterized by TG and DTA thermal analyses and electron microscopy (SEM). The results show that the type of nanotubes thermally treated at 900 °C has the best performances in terms of adsorption rate and amounts of collected acid, even if compared with the performance of activated carbons.
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Affiliation(s)
- Pierantonio De Luca
- Department of Mechanical, Energy and Management Engineering, University of Calabria, I-87036 Arcavacata di Rende, Italy;
- Correspondence: ; Tel.: +39-0984-496757
| | - Carlo Siciliano
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, I-87036 Arcavacata di Rende, Italy;
| | - Anastasia Macario
- Department of Environmental Engineering, University of Calabria, I-87036 Arcavacata di Rende, Italy;
| | - Jànos B. Nagy
- Department of Mechanical, Energy and Management Engineering, University of Calabria, I-87036 Arcavacata di Rende, Italy;
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High-temperature liquid chromatography for evaluation of the efficiency of multiwalled carbon nanotubes as nano extraction beds for removal of acidic drugs from wastewater. Greenness profiling and comprehensive kinetics and thermodynamics studies. J Chromatogr A 2021; 1639:461891. [PMID: 33513471 DOI: 10.1016/j.chroma.2021.461891] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 01/03/2021] [Accepted: 01/05/2021] [Indexed: 12/13/2022]
Abstract
The retention behavior of a series of acidic drugs, namely ketoprofen (KET), naproxen (NAP), diclofenac (DIC), and ibuprofen (IBU), on the heat-resisting ZORBAX 300SB-C18 column, was studied thermodynamically using high-temperature liquid chromatography (HTLC). A perfect correlation of the compounds' lipophilicity and the calculated thermodynamic indicators evidenced its contribution to the retention behavior. Besides, the steric fitting has a subsidiary effect on IBU retention. Isocratic HTLC separation of the four compounds was achieved using an aqueous mobile phase containing 30% acetonitrile-0.2% acetic acid-0.2% triethylamine at 60 °C. This method has been utilized to monitor the adsorption efficiency of multiwalled carbon nanotubes (MWCNTs) for the removal of the four NSAIDs from water. Different variables affecting the remediation process have been optimized such as the time of contact, pH, ionic strength, temperature, and the mass of MWCNTs. The kinetics and thermodynamics of the adsorption were investigated. The adsorption was evidenced to take place via pseudo-second-order kinetics and the intraparticle diffusion is the rate-controlling step. The thermodynamic investigation showed that the adsorption process is exothermic and enthalpy-driven, and the adsorption is more extensive at a lower temperature. The MWCNTs showed excellent adsorption efficiency of about 76.4 to 97.6% at the optimum conditions. The obtained results are promising and encouraging for the full-scale application of MWCNTs for remediation of NSAIDs-related water pollution. The green analytical chemistry metric "AGREE" and the analytical eco-scale score tool confirmed that the developed protocol is greener and more favorable to the environment and user than most of the reported literature.
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