Title

Multifunctional composite aerogels—As micropollutant scavengers

Document Type

Book Chapter

Publication Title

Inorganic-organic composites for water and wastewater treatment

First Page

229

Last Page

266

Publisher

Springer

School

School of Engineering

Comments

Mertah, O., James, A., Zargar, M., Chauhan, S., Kherbeche, A., & Chellam, P. V. (2022). Multifunctional composite aerogels—As micropollutant scavengers. In E. Lichtfouse, S. S. Muthu & A. Khadir (Eds.), Inorganic-organic composites for water and wastewater treatment (pp. 229-266). Springer, Singapore.

https://doi.org/10.1007/978-981-16-5928-7_7

Abstract

Composite aerogels are low-density porous material with a high surface area, facilitating their application in wastewater treatment. The surface of these aerogels can be modified based on the ionic charge of the target pollutants. Improved properties like high gas holdup, a low mean free path of diffusion, high mechanical strength, and integrated 3D gel architecture make them an ideal matrix for several environmental applications. This review focuses on carbon, silica, metal-based, and biopolymer composite aerogels toward effluent treatment. The challenges in the synthesis of aerogels using various reduction methods and strategies for surface modification of aerogels having improved water treatment properties are compared. Composite aerogels’ application for removing textile dyes, heavy metals, and pesticides, and the oil separation is discussed along with relevant reaction kinetics. The adsorptive and photocatalytic removal of micropollutants by aerogels are also compared. Though several novel composite aerogels have been experimented with in wastewater treatment, the toxicity implications limit their extensive scale application. The toxicity of precursor compounds such as polyacrylonitrile, resorcinol–formaldehyde, phenol, Tetramethyl orthosilicate (TMOS), and leaching of nanoparticles from aerogels are discussed. As a solution to these impediments, bio-aerogels’ use and further improvement for water treatment are highly warranted. The possibility of using aerogels in large-scale applications in moving toward a sustainable circular economy is also emphasized.

DOI

10.1007/978-981-16-5928-7_7

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