A perspective on graphene based aerogels and their environmental applications

Pinelli, Filippo; Piras, Chiara; Rossi, Filippo

doi:10.1016/j.flatc.2022.100449

Cited by 24 publications

(18 citation statements)

References 101 publications

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“…The binding event can then be detected using various transduction methods such as electrochemical techniques. Aerogel-based biosensors have several advantages over traditional biosensors, including increased sensitivity and selectivity due to their large surface area and porosity [21,22]. They also have potential for point-of-care diagnostics, as they can be designed to be portable and easy to use [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Trends on Aerogel-Based Biosensors for Medical Applications: An Overview

Almeida,

Merillas,

Pontinha

2024

IJMS

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Aerogels are unique solid-state materials composed of interconnected 3D solid networks and a large number of air-filled pores. This structure leads to extended structural characteristics as well as physicochemical properties of the nanoscale building blocks to macroscale, and integrated typical features of aerogels, such as high porosity, large surface area, and low density, with specific properties of the various constituents. Due to their combination of excellent properties, aerogels attract much interest in various applications, ranging from medicine to construction. In recent decades, their potential was exploited in many aerogels’ materials, either organic, inorganic or hybrid. Considerable research efforts in recent years have been devoted to the development of aerogel-based biosensors and encouraging accomplishments have been achieved. In this work, recent (2018–2023) and ground-breaking advances in the preparation, classification, and physicochemical properties of aerogels and their sensing applications are presented. Different types of biosensors in which aerogels play a fundamental role are being explored and are collected in this manuscript. Moreover, the current challenges and some perspectives for the development of high-performance aerogel-based biosensors are summarized.

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Section: Introductionmentioning

confidence: 99%

Trends on Aerogel-Based Biosensors for Medical Applications: An Overview

Almeida,

Merillas,

Pontinha

2024

IJMS

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“…They have unique characteristics, such as low heat conductivity and large specific surface area. They are suitable for specific constructional, electrical, medical, and environmental applications because of their unique properties 42 , 43 . A novel class of integrated aerogels may now be synthesized thanks to organic precursors that can create stable covalently linked (C–C) organic polymers 44 .…”

Section: Introductionmentioning

confidence: 99%

Mechanisms and factors affecting the removal of minocycline from aqueous solutions using graphene-modified resorcinol formaldehyde aerogels

Yazdanbakhsh,

Behzadi,

Moghaddam

et al. 2023

Sci Rep

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In recent years, concerns about the presence of pharmaceutical compounds in wastewater have increased. Various types of residues of tetracycline family antibiotic compounds, which are widely used, are found in environmental waters in relatively low and persistent concentrations, adversely affecting human health and the environment. In this study, a resorcinol formaldehyde (RF) aerogel was prepared using the sol–gel method at resorcinol/catalyst ratio of 400 and resorcinol/water ratio of 2 and drying at ambient pressure for removing antibiotics like minocycline. Next, RF aerogel was modified with graphene and to increase the specific surface area and porosity of the modified sample and to form the graphene plates without compromising the interconnected porous three-dimensional structure of the aerogel. Also, the pores were designed according to the size of the minocycline particles on the meso- and macro-scale, which bestowed the modified sample the ability to remove a significant amount of the minocycline antibiotic from the aqueous solution. The removal percentage of the antibiotic obtained by UV–vis spectroscopy. Ultimately, the performance of prepared aerogels was investigated under various conditions, including adsorbent doses (4–10 mg), solution pHs (2–12), contact times of the adsorbent with the adsorbate (3–24 h), and initial concentration of antibiotic (40–100 mg/l). The results from the BET test demonstrated that the surface area of the resorcinol formaldehyde aerogel sample, which included 1 wt% graphene (RF-G1), exhibited an augmentation in comparison to the surface area of the pure aerogel. Additionally, it was noted that the removal percentage of minocycline antibiotic for both the unmodified and altered samples was 71.6% and 92.1% at the optimal pH values of 4 and 6, respectively. The adsorption capacity of pure and modified aerogel for the minocycline antibiotic was 358 and 460.5 mg/g, respectively. The adsorption data for the modified aerogel was studied by the pseudo-second-order model and the results obtained from the samples for antibiotic adsorption with this model revealed a favorable fit, which indicated that the chemical adsorption in the rapid adsorption of the antibiotic by the modified aerogel had occurred.

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“…Aerogels are a highly intriguing group of solid materials known for their exceptional lightweight nature, low density, high porosity, and high surface area primarily attributed to their distinct porous structure 1 . These materials exhibit an impressively high porosity range, spanning from 80% to 99.8%, resulting in an extremely low bulk density of 3–150 mg/cm 3 and a significantly large surface area of 500–1000 m 2 /g 2 – 4 . Aerogels are first reported by Kistler and co‐workers, where they discover a porous materials made up of linked nanostructures, formed by replacing the liquid in their gels with gas through super critical drying 5 .…”

Section: Introductionmentioning

confidence: 99%

Eco‐friendly production and performance evaluation of water‐resistant cellulose nanofiber bioaerogels

Mawardi,

Saharudin,

Ahmad

et al. 2023

Polymer Engineering & Sci

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A sustainable and environmentally conscious approach was employed to create a cellulose nanofiber (CNF) bioaerogel. This modified technique was used for its affordability and eco‐friendly nature, involved the use of reduced concentrations of NaOH solution (ranging from 0 to 0.5 M) to disperse the CNFs. The process included mixing, freezing, neutralizing, and freeze‐drying, ultimately resulting in well‐structured 3D bioaerogels. The concentration of NaOH had a significant impact on the properties of the bioaerogels. The density of the aerogels increases with higher concentration of NaOH. All treated aerogels exhibited impressive water resistance and maintained their structural integrity when exposed to water, indicating promising practical applications. This enhanced structural integrity is attributed to CNF chain rearrangement, facilitated by CNF swelling, dissolution in NaOH, and homogenization. FTIR and XRD analyses provided insight into the transition from cellulose I to cellulose‐II in the bioaerogel structure. These findings contribute to the development of eco‐friendly bioaerogels for environmentally conscious applications. Further research is needed to gain a deeper understanding of the process and to optimize conditions for specific bioaerogel properties.

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A perspective on graphene based aerogels and their environmental applications

Cited by 24 publications

References 101 publications

Trends on Aerogel-Based Biosensors for Medical Applications: An Overview

Trends on Aerogel-Based Biosensors for Medical Applications: An Overview

Mechanisms and factors affecting the removal of minocycline from aqueous solutions using graphene-modified resorcinol formaldehyde aerogels

Eco‐friendly production and performance evaluation of water‐resistant cellulose nanofiber bioaerogels

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