Aerogels for water treatment: A review

Ganesamoorthy, Ramasamy; Kumar, V. Vinod; Kumar, Rajnish; Kushwaha, Omkar S.; Mamane, Hadas

doi:10.1016/j.jclepro.2021.129713

Cited by 99 publications

(47 citation statements)

References 133 publications

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“…Several approaches were developed to change the nature of nanocellulose aerogel to become superhydrophobic, enhance its compressibility and elasticity and make it magnetically responsive for easier recovery and reusability. Several review articles have been published regarding the synthesis and characterization of highly hydrophobic, oil-absorbing aerogels [ 14 ] and aerogels for general application and water treatment applications [ 15 ]. Zamparas et al [ 16 ] discussed the modification methods for improving the hydrophobicity of natural sorbents without specifying any type of biopolymers.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Modification Strategies of Nanocellulose-Based Aerogels for Oil Absorption Application

et al. 2022

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Oil spills and oily wastewater have become a major environmental problem in recent years, directly impacting the environment and biodiversity. Several techniques have been developed to solve this problem, including biological degradation, chemicals, controlled burning, physical absorption and membrane separation. Recently, biopolymeric aerogels have been proposed as a green solution for this problem, and they possess superior selective oil absorption capacity compared with other approaches. Several modification strategies have been applied to nanocellulose-based aerogel to enhance its poor hydrophobicity, increase its oil absorption capacity, improve its selectivity of oils and make it a compressible and elastic magnetically responsive aerogel, which will ease its recovery after use. This review presents an introduction to nanocellulose-based aerogel and its fabrication approaches. Different applications of nanocellulose aerogel in environmental, medical and industrial fields are presented. Different strategies for the modification of nanocellulose-based aerogel are critically discussed in this review, presenting the most recent works in terms of enhancing the aerogel performance in oil absorption in addition to the potential of these materials in near future.

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Section: Introductionmentioning

confidence: 99%

Recent Progress in Modification Strategies of Nanocellulose-Based Aerogels for Oil Absorption Application

et al. 2022

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“…[ 26 ]. Gel aging can increase cross-linking and can result in the creation of aerogels with excellent pore sizes, as well as large surface areas [ 27 ]. For the additional solvent exchange, different solvents with low surface tensions can be used, which can lower the surface tension of the pore liquid of the hydrogel.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Precursor’s Nature and Drying Conditions on the Structure, Morphology, and Thermal Properties of TiO2 Aerogels

Donėlienė¹,

Fataraitė‐Urbonienė

Danchova

et al. 2022

Gels

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A cost-effective solution for the synthesis of high-porosity TiO2 aerogels, which can be used as a mesoporous perovskite network charge-carrier material during the manufacture of solar cells, is described. The effects of the synthesis parameters (precursor (titanium (IV) isopropoxide (TIP) and tetrabutyl orthotitanate (TBOT)), additional solvent exchange (n-hexane (nH), cyclohexane (CH), and diethyl ether (DE)), subcritical drying (800 mbar vacuum, 70 °C, 8 h), aging, and calcination on the aerogel’s structure have been investigated. Methods of XRD, FT-IR, BET, Raman, STA, SEM, UV–vis, and thermal conductivity measurements were applied to find out the relation between the synthesis conditions and the properties of the synthesized aerogels. Amorphous aerogels are polydispersed systems with the highest probability of pore diameter from 0.5 to 15 nm. An nH-exchanged, aged aerogel synthesized from the precursor TIP shows the highest diameter of pores. After calcination, the aerogels tend to crystallize into an anatase phase and the size of the crystallites depends on the precursor’s nature. Calcination leads to a significant increase in both the apparent and true density of the aerogels, and it also results in an increase in porosity and thermal conductivity.

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“…[1][2][3] Thus, they have become good candidates for use in thermal insulation, 4,5 environmental remediation, 6 energy and gas storage, 7 catalyst supports, 8,9 electrical devices, 10 and many other fields. [11][12][13] Traditional aerogels such as inorganic aerogels have excellent properties and are often used in industrial and building insulation, while their intrinsic brittleness limits their applications, [14][15][16] especially in extreme environments such as aerospace. 17 Accordingly, over the last several years, interest has turned to organic polymer-based aerogels due to their excellent mechanical and environmental stability to silica and other metal-oxide aerogels.…”

Section: Introductionmentioning

confidence: 99%

“…Aerogels are porous materials with unique properties, such as high porosity, low density, pore size, and high surface area 1–3 . Thus, they have become good candidates for use in thermal insulation, 4,5 environmental remediation, 6 energy and gas storage, 7 catalyst supports, 8,9 electrical devices, 10 and many other fields 11–13 . Traditional aerogels such as inorganic aerogels have excellent properties and are often used in industrial and building insulation, while their intrinsic brittleness limits their applications, 14–16 especially in extreme environments such as aerospace 17 .…”

Section: Introductionmentioning

confidence: 99%

Preparation of polyimide aerogels by freeze‐extraction and chemical imidization for 3D printing

Guo

Qin

Yao

et al. 2022

J of Applied Polymer Sci

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Polyimide (PI) aerogels with excellent mechanical and thermal stability, low density, and flexibility have attracted extensive attention in recent years. However, the existing preparation method usually requires chemical pre‐crosslinking followed by supercritical drying or freeze drying, and then thermal imidization, which has the weakness of a complicated preparation method and high cost. In this study, PI aerogels were prepared by a simple method that involved freeze extraction and chemical imidization, which exhibited low density (0.14 g cm−3), high porosity (85.61%), excellent thermal stability (T5% and Tg were 418.12 and 230.60°C, respectively), shape fidelity, and compressibility. Furthermore, this method regulated the pore size, such as the macro/microstructure, and then used the PI aerogel ink to build complex architectures by 3D printing. As a proof of concept, pyramids, multilayer grids, ring‐hole disks, Chinese knots and cuboids were printed, and all of them exhibited the shape fidelity property after freeze‐extraction and chemical imidization. Therefore, we believe this novel preparation method enables significant promotion of the application potential of PI aerogels and 3D printing.

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Aerogels for water treatment: A review

Cited by 99 publications

References 133 publications

Recent Progress in Modification Strategies of Nanocellulose-Based Aerogels for Oil Absorption Application

Recent Progress in Modification Strategies of Nanocellulose-Based Aerogels for Oil Absorption Application

The Influence of the Precursor’s Nature and Drying Conditions on the Structure, Morphology, and Thermal Properties of TiO2 Aerogels

Preparation of polyimide aerogels by freeze‐extraction and chemical imidization for 3D printing

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