A comprehensive review on micropollutants removal using carbon nanotubes-based adsorbents and membranes

Khan, Fahad; Mubarak, Nabisab Mujawar; Khalid, Mohammad; Tan, Yie Hua; Abdullah, Ezzat Chan; Rahman, Muhammad Ekhlasur; Karri, Rama Rao

doi:10.1016/j.jece.2021.106647

Cited by 66 publications

(6 citation statements)

References 239 publications

(134 reference statements)

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“…Micropollutants (MPs), also referred to as emerging contaminants, typically consist of synthetic or natural compounds discharged from various sources, ultimately entering water bodies primarily at trace levels, ranging from a few nanograms per liter (ng/L) to several micrograms per liter (µg/L) [1][2][3]. They encompass primarily pharmaceuticals, personal care products, pesticides, stimulants, persistent organic pollutants, and microand nano-plastics, posing potential adverse effects on living organisms and environmental processes [4,5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Heterogeneous Catalytic Ozonation for Micropollutants Removal from Wastewater: Application of a Pre-Industrial-Scale Unit

Kaprara,

Psaltou,

Salapasidou

et al. 2024

Catalysts

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The present study evaluates the application of heterogeneous catalytic ozonation for the removal of micropollutants from wastewater effluent in a pre-industrial-scale unit, consisting of a post-filtration, an ozone dilution, a catalytic ozonation, and a final biological stabilization step. The important step of ozone dilution is optimized by the use of a hollow fiber membrane that minimizes the loss of ozone gas due to the transfer of ozone to the liquid phase mainly by diffusion. It is observed that the efficiency of this sub-system is maximized for the dead-end operation of the membrane and the introduction of ozone gas to the shell side and liquid phase to the lumen side of the membrane module. Under these conditions, the concentration of dissolved ozone is directly dependent on the ratio of ozone gas feed to the wastewater flow subjected to post-treatment. Regarding the removal of MPs, part of their degradation already takes place at this stage (i.e., during ozone dilution), while after the post-treatment of wastewater effluent in the catalytic ozonation bed, the MP degradation yield ranges from 35% up to complete removal, depending on the type and properties of the specific MP. The addition of a final biological filtration bed to the overall treatment unit significantly increased its performance, regarding the removal of MPs, enhancing it by an additional removal rate that can reach up to 30%.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Heterogeneous Catalytic Ozonation for Micropollutants Removal from Wastewater: Application of a Pre-Industrial-Scale Unit

Kaprara,

Psaltou,

Salapasidou

et al. 2024

Catalysts

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“…AHTN is not properly eliminated in conventional wastewater treatment plants (WWTPs) and enters rivers and bioaccumulates in the same way as TCS [ 38 , 39 ]. It has been demonstrated that absorption by MWCNT is an efficient technique for the removal of these compounds [ 29 , 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

Multiwalled Carbon Nanotubes Embedded in a Polymeric Matrix as a New Material for Thin Film Microextraction (TFME) in Organic Pollutant Monitoring

Quintanilla

Perelló²,

Merlo³

et al. 2023

Polymers

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It is essential to monitor organic pollutants to control contamination levels in environmental water bodies. In this respect, the development of new materials based on functionalised polymeric films for the measurement of toxic compounds is of interest. In this study, we prepare new films based on polymer cellulose triacetate modified with multi-walled carbon nanotubes for the monitoring of selected compounds: a fungicide (chlorpyrifos) and two emerging contaminants, the musk tonalide and the bactericide triclosan, which are used in the formulation of personal care products. The films, upon contact with water samples and following the principles of thin film microextraction, allow the determination of organic pollutants at low concentration levels. The contact time of the film with a predetermined volume of water is fixed at 60 min, and the compounds are eluted with a small volume (1 mL) of organic solvent for GC-MS analysis. Parameters such as repeatability for different films and detection limits are found to be satisfactory. Applying the method to river water demonstrates its suitability and, in the cases of chlorpyrifos and tonalide, the absence of a significant matrix effect.

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“…Due to their remarkable physical and chemical properties, CNTs, classified as single-walled nanotubes (SWNTs) and multi-walled nanotubes (MWNTs), have wild potential applications in hydrogen storage, adsorbents, chemical sensors, microwave absorption, batteries, solar cells, and field emission . Compared to MWNTs, SWNTs are more attractive due to their better mechanical, chemical, and thermal properties, high surface area and surface area, and especially better electrical conductivity, which make them a promising candidate material to monitor harmful gas molecules at low concentrations .…”

Section: Introductionmentioning

confidence: 99%

“…Among them, CNTbased gas sensors have attracted significant attention due to their high surface energy, high rich adsorption sites, electrical and thermal conductivities, and ballistic transport support, which lead to high sensitivity, fast response, and fast recovery time for monitoring the toxic gases. 18,19 Due to their remarkable physical and chemical properties, CNTs, classified as single-walled nanotubes (SWNTs) and multi-walled nanotubes (MWNTs), have wild potential applications in hydrogen storage, 20 adsorbents, 21 sensors, 22 microwave absorption, 23 batteries, 24 solar cells, 25 and field emission. 26 Compared to MWNTs, SWNTs are more attractive due to their better mechanical, chemical, and thermal properties, high surface area and surface area, and especially better electrical conductivity, which make them a promising candidate material to monitor harmful gas molecules at low concentrations.…”

Section: Introductionmentioning

confidence: 99%

Density Functional Theory Study of Adsorption and Selection Behavior of Harmful Gas Molecules on the Surface of SWNTs: Implications for Gas Sensing

Tang,

Zhao,

Liang

et al. 2023

ACS Appl. Nano Mater.

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To explore the adsorption and selection behavior of harmful gas molecules on the surface of single-walled nanotubes (SWNTs) within field-effect transistors (FETs), NO 2 , SO 2 , NO, CO 2 , H 2 S, and NH 3 adsorption effects on the electronic character of SWNTs (three different armchair SWNTs with indexes (6,6), (9,9), and (10,10)) were explored theoretically by density functional theory (DFT) calculations in this work. Two factors determining the sensing mechanism of real devices, namely, the electrostatic gate modulation caused by internal carrier mobility within SWNT networks and the interfacial Schottky barrier effects caused by the work function changes of SWNTs, will be examined. Calculated results show that the adsorption process of gas molecules on the surface of SWNTs is exothermic and energetically favored. From the work function results, it is predicted that the interfacial Schottky barrier of the contact between SWNTs and neighboring materials must be affected significantly upon adsorption of different gas molecules, which may lead to distinct electrical resistance changes of SWNT-FETs. Moreover, it is observed that electron density distribution of SWNTs is increased by NH 3 adsorption while it is decreased by other gas adsorptions. It means that the internal carrier mobility of SWNTs must be increased by NH 3 adsorption while it must be decreased by other gas adsorptions with a trend NO 2 > SO 2 > NO > CO 2 > H 2 S. Therefore, it is confirmed that SWNTs should be highly electrically sensitive and responsive to harmful gas molecules, which is favorable for their application in gas sensor areas.

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A comprehensive review on micropollutants removal using carbon nanotubes-based adsorbents and membranes

Cited by 66 publications

References 239 publications

Evaluation of Heterogeneous Catalytic Ozonation for Micropollutants Removal from Wastewater: Application of a Pre-Industrial-Scale Unit

Evaluation of Heterogeneous Catalytic Ozonation for Micropollutants Removal from Wastewater: Application of a Pre-Industrial-Scale Unit

Multiwalled Carbon Nanotubes Embedded in a Polymeric Matrix as a New Material for Thin Film Microextraction (TFME) in Organic Pollutant Monitoring

Density Functional Theory Study of Adsorption and Selection Behavior of Harmful Gas Molecules on the Surface of SWNTs: Implications for Gas Sensing

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