WO3/Buckypaper Membranes for Advanced Oxidation Processes

The search for efficient technologies empowering the selective capture of environmentally harmful heavy metals from wastewater treatment plants, at affordable prices, attracts wide interest but constitutes an important technological challenge. We report here an eco-friendly single-walled carbon nanotube buckypaper (SWCNT-BP) enriched with a multivariate amino acid-based metal–organic framework (MTV-MOF) for the efficient and selective removal of Pb 2+ in multicomponent water systems. Pristine MTV-MOF was easily immobilized within the porous network of entangled SWCNTs, thus obtaining a stable self-standing adsorbing membrane filter ( MTV-MOF/SWCNT-BP ). SWCNT-BP alone shows a moderately good removal performance with a maximum adsorption capacity of 180 mg·g –1 and a considerable selectivity for Pb(II) ions in highly concentrated multi-ion solutions over a wide range of lead concentration (from 200 to 10000 ppb). Remarkably, these features were outperformed with the hybrid membrane filter MTV-MOF/SWCNT-BP , exhibiting enhanced selectivity and adsorption capacity (310 mg·g –1 , which is up to 42% higher than that of the neat SWCNT-BP) and consequently enabling a more efficient and selective removal of Pb 2+ from aqueous media. MTV-MOF/SWCNT-BP was able to reduce [Pb 2+ ] from the dangerous 1000 ppb level to acceptable limits for drinking water, below 10 ppb, as established by the current EPA and WHO limits. Thus, the eco-friendly composite MTV-MOF/SWCNT-BP shows the potential to be effectively used several times as a reliable adsorbent for Pb 2+ removal for household drinking water or in industrial treatment plants for water and wastewater lead decontamination.

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“… 52 More recently, SWCNT-BPs have been proposed as innovative high-temperature-resistant and lightweight filtration systems. 53 , 54 …”

Section: Introductionmentioning

confidence: 99%

Multivariate Metal–Organic Framework/Single-Walled Carbon Nanotube Buckypaper for Selective Lead Decontamination

Baratta

Mastropietro

Bruno

et al. 2022

ACS Appl. Nano Mater.

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“…In this context, with the aim to make a step forward on MOF‐based technologies for element recovery and water remediation, we present a novel, flexible, and self‐standing MOF‐based single‐walled carbon nanotube buckypaper [ 33,36 ] (BioMOF@SWCNT‐BPs) as a new and highly performant material in REEs recovery ( Figure ). The highly crystalline bioMOF, previously reported by us [ 17 ] and prepared from the natural amino acid L‐threonine, has been homogeneously dispersed within a thin (150 µm) membrane, made with an entangled CNT network and produced by multiple steps of dispersion and filtration for lanthanide recovery from water.…”

Section: Resultsmentioning

confidence: 99%

“…It is known that both SWCNT‐BP [ 33 ] and BioMOF in polymer matrices [ 47 ] are stable after regeneration processes showing integrity and reusability over several successive cycles of adsorption and regeneration. Such properties were also confirmed for BioMOF@SWCNT‐BPs, which were reused thrice after regeneration in 250 mL ethanol for the release of adsorbed lanthanides.…”

Section: Resultsmentioning

confidence: 99%

“…[ 30,31 ] BPs merge the characteristic properties of polymer membranes such as porosity, flexibility, self‐standing, and permeation with those of CNTs such as thermal features, mechanical resistance, and enhanced electric characteristics. [ 32,33 ] The morphology of BP membranes is characterized by the presence of a porous and highly disordered structure formed by bundles of CNTs interacting via π–π and van der Waals interactions. [ 34,35 ]…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Enhanced Capture Properties of a New BioMOF@SWCNT‐BP: Recovery of the Endangered Rare‐Earth Elements from Aqueous Systems

Tursi

Mastropietro

Bruno

et al. 2021

Adv Materials Inter

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Human society is facing—among other environmental threats—an enormous challenge due to human activities. The extensive use of high‐tech devices and electronics equipment in the daily life makes, among others, rare‐earth elements (REEs) recovery from secondary sources highly required. Here, a novel bioMOF‐based single‐walled carbon nanotube buckypaper (SWCNTBP) is presented as a new and efficient composite material (BioMOF@SWCNT‐BP). The flexible and highly crystalline metal–organic framework (MOF), prepared from the natural amino acid L‐threonine, has been homogeneously dispersed within the tangled net of a self‐standing SWCNT‐BP for lanthanides recovery from water. This MOF‐carbon‐based membrane exhibits high efficiency, either in static or dynamic regimes, in the recovery of lanthanides from aqueous streams outperforming the state‐of‐the‐art. The capture performances of BPs are successfully improved after incorporation of such MOF featuring hexagonal functional channels decorated with the threonine amino acid residues, pointing toward the accessible void spaces, which boosts the capture properties of the final membrane, providing the adaptable functional environment to interact with lanthanides. This material's preparation presents also a potential for large‐scale applications with a potential benefit on natural aquatic ecosystems as well. It is highly demanded because REEs from non‐recycled waste materials are potential pollutants for surface waters.

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“…Despite their enhanced adsorption properties, due to their large surface area, porosity, and the possibility of tuning their interactions with the target pollutants by easy functionalization [37], these materials lack the possibility of easy recovery and regeneration after use due to their powdery consistency. Consequently, several researchers have tried to overcome such drawbacks by assembling such materials in buckypapers (BPs) [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

GO-SWCNT Buckypapers as an Enhanced Technology for Water Decontamination from Lead

et al. 2022

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Water decontamination is an important challenge resulting from the incorrect disposal of heavy metal waste into the environment. Among the different available techniques (e.g., filtration, coagulation, precipitation, and ion-exchange), adsorption is considered the cheapest and most effective procedure for the removal of water pollutants. In the last years, several materials have been tested for the removal of heavy metals from water, including metal-organic frameworks (MOFs), single-walled carbon nanotubes (SWCNTs), and graphene oxide (GO). Nevertheless, their powder consistency, which makes the recovery and reuse after adsorption difficult, is the main drawback for these materials. More recently, SWCNT buckypapers (SWCNT BPs) have been proposed as self-standing porous membranes for filtration and adsorption processes. In this paper, the adsorption capacity and selectivity of Pb2+ (both from neat solutions and in the presence of other interferents) by SWCNT BPs were evaluated as a function of the increasing amount of GO used in their preparation (GO-SWCNT buckypapers). The highest adsorption capacity, 479 ± 25 mg g−1, achieved for GO-SWCNT buckypapers with 75 wt.% of graphene oxide confirmed the effective application of such materials for cheap and fast water decontamination from lead.

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WO3/Buckypaper Membranes for Advanced Oxidation Processes

Cited by 7 publications

References 52 publications

Multivariate Metal–Organic Framework/Single-Walled Carbon Nanotube Buckypaper for Selective Lead Decontamination

Multivariate Metal–Organic Framework/Single-Walled Carbon Nanotube Buckypaper for Selective Lead Decontamination

Synthesis and Enhanced Capture Properties of a New BioMOF@SWCNT‐BP: Recovery of the Endangered Rare‐Earth Elements from Aqueous Systems

GO-SWCNT Buckypapers as an Enhanced Technology for Water Decontamination from Lead

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