Growth and functionalization of carbon nanotubes on quartz filter for environmental applications

Amade, Roger; Hussain, Shahzad; Romero‐Ocaña, Ismael; Bertrán, E.

doi:10.7243/2050-1323-3-2

Cited by 16 publications

(7 citation statements)

References 46 publications

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“…MWCNTs (110-170 nm) revealed very short bres and large diameters, as anticipated (Fig. 5,36 The increased dispersion of MWCNTs in water proved the successful oxidation of MWCNTs. Atomic force microscopy (AFM) studies have shown that there is an insignicant decrease in length following the oxidation process.…”

Section: Characterization Of Pristine Mwcnts and Omwcntssupporting

confidence: 76%

“…1 The two forms of CNTs are the single-walled carbon nanotubes (SWCNTs) and the multi-walled carbon nanotubes (MWCNTs), which are formed from either a single roll or several cylindrical shells of graphene sheet, respectively. 5 However, especially in aqueous environments their application has been limited due to their strong van der Waals forces leading to agglomeration. 5 However, especially in aqueous environments their application has been limited due to their strong van der Waals forces leading to agglomeration.…”

Section: Introductionmentioning

confidence: 99%

“…CNTs are characterized by their extraordinary chemical and mechanical stability, unique electrical properties, [2][3][4] and strong interactions with aromatic constituents due to the delocalized p electron system. 5 However, especially in aqueous environments their application has been limited due to their strong van der Waals forces leading to agglomeration. Past studies have indicated that surface modication via covalent and non-covalent interactions improves the solubility of CNTs in organic and aqueous media.…”

Section: Introductionmentioning

confidence: 99%

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Multi-walled carbon nanotubes: innovative sorbents for pre-concentration of polychlorinated biphenyls in aqueous environments

Ndunda

Mizaikoff

2015

Anal. Methods

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Carbon nanotubes (CNTs) have demonstrated outstanding chemical and mechanical stability, electrical properties, and strong interactions with aromatic compounds owing to the p-electron system on the graphene sheets. Taking advantage of these unique properties, we have developed a fully validated sample pre-concentration technique for determination of polychlorinated biphenyls (PCBs) in aqueous environments using gas chromatography combined with a micro-cell electron capture detector (GC-mECD). The optimized method using pristine MWCNTs gave recoveries in the range of 46.0-92.5%, 51.4-91.5%, 48.7-77.8% for tap water, river water, and lake water, respectively. Compared to conventional C18 adsorbent and oxidized MWCNTs (oMWCNTs), pristine MWCNTs provided the best recoveries, thereby confirming that MWCNTs are excellent alternatives for C18, with the ability to achieve high performance. The developed protocol achieved method detection limits in the range of 0.002-0.011 mg L À1 and relative standard deviation (RSD) < 15.5%.

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Section: Characterization Of Pristine Mwcnts and Omwcntssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-walled carbon nanotubes: innovative sorbents for pre-concentration of polychlorinated biphenyls in aqueous environments

Ndunda

Mizaikoff

2015

Anal. Methods

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“…These formed agglomerates were special feature found on collecting emissions from this CNT synthesis on such hydrophilic filter fibers. The results found here, and this interpretation of the methodology for structure formation, are consistent with the results of Amade et al, who found similar structures when directly depositing untreated hydrophobic CNTs onto quartz fibers (Amade et al, 2014).…”

Section: Collection Of Exhaust Particles On Filterssupporting

confidence: 82%

Assessment of exhaust emissions from carbon nanotube production and particle collection by sampling filters

Tsai

Hofmann

Hallock

et al. 2015

Journal of the Air & Waste Management Association

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This study performed a workplace evaluation of emission control using available air sampling filters and characterized the emitted particles captured in filters. Characterized particles were contained in the exhaust gas released from carbon nanotube (CNT) synthesis using chemical vapor deposition (CVD). Emitted nanoparticles were collected on grids to be analyzed using transmission electron microscopy (TEM). CNT clusters in the exhaust gas were collected on filters for investigation. Three types of filters, including Nalgene surfactant-free cellulose acetate (SFCA), Pall A/E glass fiber, and Whatman QMA quartz filters, were evaluated as emission control measures, and particles deposited in the filters were characterized using scanning transmission electron microscopy (STEM) to further understand the nature of particles emitted from this CNT production. STEM analysis for collected particles on filters found that particles deposited on filter fibers had a similar morphology on all three filters, that is, hydrophobic agglomerates forming circular beaded clusters on hydrophilic filter fibers on the collecting side of the filter. CNT agglomerates were found trapped underneath the filter surface. The particle agglomerates consisted mostly of elemental carbon regardless of the shapes. Most particles were trapped in filters and no particles were found in the exhaust downstream from A/E and quartz filters, while a few nanometer-sized and submicrometer-sized individual particles and filament agglomerates were found downstream from the SFCA filter. The number concentration of particles with diameters from 5 nm to 20 µm was measured while collecting particles on grids at the exhaust piping. Total number concentration was reduced from an average of 88,500 to 700 particle/cm 3 for the lowest found for all filters used. Overall, the quartz filter showed the most consistent and highest particle reduction control, and exhaust particles containing nanotubes were successfully collected and trapped inside this filter.Implications: As concern for the toxicity of engineered nanoparticles grows, there is a need to characterize emission from carbon nanotube synthesis processes and to investigate methods to prevent their environmental release. At this time, the particles emitted from synthesis were not well characterized when collected on filters, and limited information was available about filter performance to such emission. This field study used readily available sampling filters to collect nanoparticles from the exhaust gas of a carbon nanotube furnace. New agglomerates were found on filters from such emitted particles, and the performance of using the filters studied was encouraging in terms of capturing emissions from carbon nanotube synthesis.

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“…Carbon nanotubes deposited on quartz filters used to eliminate and monitor the VOCs and other air pollutants by out by π-π interactions (Fig. 4) [17].Nano-adsorptive materials acting as a -super adsorbent‖ for several air pollutants like harmful gases and volatile organics via [18]:…”

Section: Adsorptionmentioning

confidence: 99%

Review Article Revolution of Nanotechnology in Air Pollution

Mohamed

2018

The International Conference on Chemical and Environmental Engi

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Importance of the field: Environmental contamination is one of the important issues that the world is confronting today, and it is expanding with each passing year and leading to grave and harmful effect to the earth. At present, the air contains various pollutants like CO, chlorofluorocarbons, volatile organic compounds, hydrocarbons, and nitrogen oxides. Water and soil are also contaminated with organic and inorganic compounds; the major sources for water and soil contamination are sewage water, industrial effluents, and random use of pesticides, fertilizers, and oil spills. In parallel, the rapid growth of nanotechnology has gained a great deal of interest in the applications of nanomaterial's potential in improved systems for monitoring and cleanup including all the three phases of environment. It can develop the pollutants sensing and detection and help in the improvement of novel remediation technologies. Areas covered in this review: In this review, we discuss the recent progress towards the use of nanotechnology in a variety of above-mentioned applications. Furthermore, we expand upon the current progress in nanomaterial engineering approaches describing several recent examples that are utilized to enhance stability, catalytic efficiency, and utilization of alternate oxidants. What the reader will gain: The review will provide a comprehensive knowledge in the definition of nanoparticles, and the nanotechnology concept, design of nanomaterial for potentially practical purposes. Finally, we provide a prospective on the future aspects of nanotechnology and its applications in air pollution remediation. Take home message: Because of its wide applications, academic researchers, environmental scientists, and health care providers are expected to gain current knowledge and future prospects of the practical use of nanomaterial in environmental fields.

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Growth and functionalization of carbon nanotubes on quartz filter for environmental applications

Cited by 16 publications

References 46 publications

Multi-walled carbon nanotubes: innovative sorbents for pre-concentration of polychlorinated biphenyls in aqueous environments

Multi-walled carbon nanotubes: innovative sorbents for pre-concentration of polychlorinated biphenyls in aqueous environments

Assessment of exhaust emissions from carbon nanotube production and particle collection by sampling filters

Review Article Revolution of Nanotechnology in Air Pollution

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