Adsorption of Cu (II) ions from water by carbon nanotubes oxidized with UV-light and ultrasonication

Bayazit, Şahika Sena; İncı̇, İsmail

doi:10.1016/j.molliq.2014.10.001

Cited by 26 publications

(12 citation statements)

References 30 publications

(28 reference statements)

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“…Cu 2+ adsorption capacities on CNTs oxidized by various chemical methods are summarized in Table . These results are comparable to those reported by Tang et al who indicated that the sorption process of the CNTs for adsorbing Cu 2+ was rapid and reached equilibrium in 2 h. Also, Iman et al reported a CNT adsorption capacity of 10 mg Cu 2+ g –1 equilibrated in 40 min at 20 °C and Sahika and Ismail also reported that various CNTs with different oxidation treatments (i.e., ultrasonication/HNO 3 and UV/HNO 3 ) could generally reach over 40 mg g –1 of Cu 2+ adsorption capacities. The BSPS/CNTs with more dissociative functional groups (e.g., – COONa) compared to CNTs show better dispersion and have more effective specific surface area for adsorption to occur.…”

Section: Resultssupporting

confidence: 87%

“…37%) from Sigma-Aldrich. The MWCNTs was purified using an acid washing procedure (2.5% HCl) to remove impurities present and then rinsed with reverse osmosis (RO) water in accordance with the procedure outlined by Liang et al Thereafter, the MWCNTs were dried at 105 °C for 1 h prior to storage in a desiccator at ambient temperature. , Note that the acronym “CNTs” was used to represent the original acronym “MWCNTs”, which represents CNTs that has already been acid-washed.…”

Section: Methodsmentioning

confidence: 99%

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Persulfate Chemical Functionalization of Carbon Nanotubes and Associated Adsorption Behavior in Aqueous Phase

Huang

Liang

Chen

2016

Ind. Eng. Chem. Res.

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The chemical functionalization of carbon nanotubes (CNTs) using sodium persulfate (SPS) oxidation was designed to improve their dispersion stability in water. The test results indicated that base activated SPS oxidation of CNTs (BSPS/CNTs) adds a significant amount of oxygen functional groups to the surface of CNTs. The BSPS/CNTs dispersion is dependent on a solution within the pH range of 5−12. Experimental results obtained by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy demonstrated that CNTs were successfully modified and the carboxylic functional groups (e.g., −COO − Na + or −COO − H + ) were created. The BSPS/CNTs, which carry negative charges, enhance the dispersion characteristics of CNTs. The BSPS/CNTs adsorption capacities of inorganic ions (e.g., copper ion) and organic compounds (e.g., benzene) were higher than those obtained by raw CNTs mainly due to enhanced CNTs dispersion. Furthermore, Langmuir and Freundlich adsorption models were applied to examine both raw CNTs and BSPS/CNTs adsorption behaviors. Copper and benzene sorption onto BSPS/CNTs fit the Freundlich isotherm model well, while raw CNTs adsorption did not fit any model. The findings of this study are of great significance for the base activated persulfate oxidation process, indicating that the functionalization of CNTs enhances CNTs dispersivity in water.

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Section: Resultssupporting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Persulfate Chemical Functionalization of Carbon Nanotubes and Associated Adsorption Behavior in Aqueous Phase

Huang

Liang

Chen

2016

Ind. Eng. Chem. Res.

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“…Assuming that the reaction of CB with HNO 3 would proceed similarly to what has been proposed for soot and graphitic carbons (CNT, graphite, fullerene, etc. )[130][131][132][133], a possible mechanism of CB oxidation with HNO 3 is illustrated inFigure 21.Two molecules of HNO 3 interact with each other providing the surface with the required oxygen, with subsequent H 2 O and NOx evolution as by-products of HNO 3 treatment. CO 2…”

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confidence: 99%

Carbon black reborn: Structure and chemistry for renewable energy harnessing

Khodabakhshi

Fulvio

Andreoli

2020

Carbon

214

104

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Carbon Black (CB) is one of the most abundantly produced carbon nanostructured materials, and approximately 70% of it is used as pigment and as reinforcing phase in rubber and plastics. Recent scientific findings report on other uses of CB that are of current interest, such as renewable energy harvesting and carbon capture. The present review focuses on the use and role of CB in renewable and environmental applications relevant to contemporary global challenges focusing specifically on clean energy. Key and recent research on the structure and chemistry of CB, including its uses as precursors to graphene quantum dots and hollow carbon spheres, is discussed in relation to renewable energy devices, electrochemical energy storage and environmental remediation. The surface chemistry of CB is closely related to that of graphitic and of turbostratic carbons through the predominant hexagonal carbon lattice from graphene fragments forming its basic structural units. Consequently, modern methods for grafting polymers and functional groups are easily translated to this abundant nanostructured material. Moreover, recent advances in electron microscopy that probe the structure of CB, and its electronic and physicochemical properties in nanocomposites revived the attention of what is wrongfully considered as a scientifically uninspiring material with limited potential for future technology breakthrough. CB has the potential to surge as a key player in renewable energy and environmental applications, meaning "When Black Turns Green".

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“…The improved adsorption by oxidized CNTs compared to its pristine form has been reported by several studies. [10][11][12][13][14][15][16][17] Oxidation thus by incorporating of carboxylic or phenolic hydroxyl group on the surface of CNTs provides active sites for further chemical modications. Desired functionalities, e.g., amine, 18 thiol, 19 histidine, 20 tannic acid, 21 hydroquinone, 22 EDTA, 23 phosphinic acid, 24 starch, 25 polyacrylamide 26 etc., have been covalently introduced on to the surface of CNTs for selective and more sensitive separation of metal ions and organics.…”

Section: Introductionmentioning

confidence: 99%

Unanticipated favoured adsorption affinity of Th(iv) ions towards bidentate carboxylate functionalized carbon nanotubes (CNT–COOH) over tridentate diglycolamic acid functionalized CNT: density functional theoretical investigation

2015

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Adsorption of Cu (II) ions from water by carbon nanotubes oxidized with UV-light and ultrasonication

Cited by 26 publications

References 30 publications

Persulfate Chemical Functionalization of Carbon Nanotubes and Associated Adsorption Behavior in Aqueous Phase

Persulfate Chemical Functionalization of Carbon Nanotubes and Associated Adsorption Behavior in Aqueous Phase

Carbon black reborn: Structure and chemistry for renewable energy harnessing

Unanticipated favoured adsorption affinity of Th(iv) ions towards bidentate carboxylate functionalized carbon nanotubes (CNT–COOH) over tridentate diglycolamic acid functionalized CNT: density functional theoretical investigation

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