Carbon Nanotubes (CNTs): A Potential Nanomaterial for Water Purification

Arora, Bharti; Attri, Pankaj

doi:10.3390/jcs4030135

Cited by 96 publications

(51 citation statements)

References 143 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The chemical properties of carbon nanomaterials provide the control of various adsorption parameters such as loading capacity for pollutants, recovery of pollutant through variation of solution pH, and temperature. These properties of carbon materials make them efficient and preferred adsorbents in comparison to other adsorbents [202].…”

Section: Techniques Of Removal Of Pollutantsmentioning

confidence: 99%

Carbon Nanomaterials for Wastewater Treatment

et al. 2021

View full text Add to dashboard Cite

The research progress made in recent years in removal of organic-inorganic pollutants from wastewater using various types of carbon materials as adsorbents such as carbon nanotubes, carbon nanofibers, graphenes, graphitic carbon nitride, fullerene, activated carbon spheres, and carbon quantum dots is reviewed. These carbon nanomaterials with hierarchical structures are efficient and economical adsorbents. The techniques of metal impregnation and doping help to control the porosity and surface area of nanomaterials. Electrostatic forces, p-p and p-e interactions, van der Waals weak forces, and oxygen-containing groups are considered responsible for the removal of pollutants from wastewater. The carbon nanomaterial-based photocatalysts are applied successfully in decomposition of persistent dyes under visible light. Fe 3 O 4 magnetic material is employed as recyclable adsorbent after treatment of wastewater. Freundlich and Langmuir models are found more suitable to calculate the adsorption efficiency and adsorption kinetics of pollutants. Criteria and properties of carbon nanomaterials are discussed that might play a significant role in remediation of wastewater.

show abstract

Section: Techniques Of Removal Of Pollutantsmentioning

confidence: 99%

Carbon Nanomaterials for Wastewater Treatment

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Figure 1 shows the surface structure and adsorption sites for CNT in bundles [19]. CNTs in bundles have two kinds of adsorption sites: external sites (exterior and groove) and internal sites (interior and interstitial) [18,20]. According to the study done by Zhao et al (2002), the adsorption ability and charge transferred for SWCNT are weak and small, whilst the adoption ability for CNT in bundles is high in interstitial and groove sites, which means the interior site is slightly more energetic than the exterior site.…”

Section: Methyl Orangementioning

confidence: 99%

Application of Carbon Nanotubes (CNTs) for Remediation of Emerging Pollutants - A Review

Chung

Hasyimah

Hussein

2021

Trop. Aqua. Soil Pollut.

View full text Add to dashboard Cite

Nanotechnology is currently an upward trend in diverse fields, and therefore, its application will be reviewed in this paper. One of the nanotechnologies which can be used in environmental remediation is carbon nanotube (CNT). Its excellent mechanical and chemical properties allow it to have better achievement in remediating a wide range of organic and inorganic pollutants. CNT can be categorized into two types: single-walled carbon nanotube and multi-walled carbon nanotube. Due to urbanization, various types of pollutants have been released into the environment in great amounts. For instance, estrogen is the hormone generated and released from animals and humans. However, the overconcentration of estrogen affects the physiology of biological life. Besides, pesticides are frequently used by farmers to increase the fertility of the land for agricultural purposes, while heavy metals are commonly found during anthropogenic activities. Long-term absorption of heavy metals into the body tissues will accumulate toxic effects, leading to body system dysfunction. Hence, CNT technologies, including adsorption, membrane filtration, disinfection, hybrid catalysis, and sensing and monitoring, can be applied to remediate these pollutants. However, the application of nanotechnology and CNT faces several challenges, such as production costs, toxicity, ecological risks, and public acceptance. Application of CNT also has pros and cons, such that the lightweight of the CNT allows them to replace metallic wires, but dealing with nano-sized components makes it challenging.

show abstract

“…They are broadly classified into single walled carbon nanotubes (SWCNT) and multi-walled carbon nanotubes (MWCNT), and both are extensively tested for the removal of heavy metals [39][40][41]. In the case of CNT, the adsorption process is usually controlled by four possible active sites: (i) the hollow interior of individual CNT designated as internal sites; (ii) the interstitial channels between CNT in the stacks; (iii) the grooves between adjacent CNT; and (iv) the external surface of individual CNT [42,43] (Figure 2). The sites of interstitial channels and grooves are responsible for initializing the process of adsorption, which is then followed by the adsorption of the contaminants on the external walls and the accumulation of molecules on internal axial sites.…”

Section: Carbon Nanotubesmentioning

confidence: 99%

Nanoadsorbants for the Removal of Heavy Metals from Contaminated Water: Current Scenario and Future Directions

Kumar

Rauwel

2021

Processes

View full text Add to dashboard Cite

Heavy metal pollution of aquatic media has grown significantly over the past few decades. Therefore, a number of physical, chemical, biological, and electrochemical technologies are being employed to tackle this problem. However, they possess various inescapable shortcomings curbing their utilization at a commercial scale. In this regard, nanotechnology has provided efficient and cost-effective solutions for the extraction of heavy metals from water. This review will provide a detailed overview on the efficiency and applicability of various adsorbents, i.e., carbon nanotubes, graphene, silica, zero-valent iron, and magnetic nanoparticles for scavenging metallic ions. These nanoparticles exhibit potential to be used in extracting a variety of toxic metals. Recently, nanomaterial-assisted bioelectrochemical removal of heavy metals has also emerged. To that end, various nanoparticle-based electrodes are being developed, offering more efficient, cost-effective, ecofriendly, and sustainable options. In addition, the promising perspectives of nanomaterials in environmental applications are also discussed in this paper and potential directions for future works are suggested.

show abstract

Carbon Nanotubes (CNTs): A Potential Nanomaterial for Water Purification

Cited by 96 publications

References 143 publications

Carbon Nanomaterials for Wastewater Treatment

Carbon Nanomaterials for Wastewater Treatment

Application of Carbon Nanotubes (CNTs) for Remediation of Emerging Pollutants - A Review

Nanoadsorbants for the Removal of Heavy Metals from Contaminated Water: Current Scenario and Future Directions

Contact Info

Product

Resources

About