Construction of a Superhydrophobic Sodium Alginate Aerogel for Efficient Oil Absorption and Emulsion Separation

Yang, Sam; Chen, Xiuping; Li, Yiming; Yin, Zichao; Bao, Mutai

doi:10.1021/acs.langmuir.0c03229

Cited by 83 publications

(30 citation statements)

References 57 publications

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“…Specifically, the hierarchically porous structure of sorbent can hold some these viscous oils which results in a high oil sorption capacity. [124][125][126][127][128][129][130][131][132][133] On the other hand, the absorption mechanism happens not only on the surfaces but mostly inside the polymer matrix with an extensive polymer matrix swelling (Figure 4B). The Flory−Rehner theory (Equation ( 1)) can be used to determine the network structure (i.e., crosslinking density and molecular weight between cross-links) and provide the structure−property relationships.…”

Section: Oil Removal Mechanisms Of Sorbentsmentioning

confidence: 99%

A Role for Newly Developed Sorbents in Remediating Large‐Scale Oil Spills: Reviewing Recent Advances and Beyond

Kim

Zhang

Chung

et al. 2021

Advanced Sustainable Systems

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The conservation of ocean and freshwater have been crucial issues over the past decades, and oil/water separation is a well‐known technology to restore polluted water systems. In the meantime, oil sorbents serve as a promising means of achieving water conservation to recover from oil spills, which require a multi‐factorial approach to review high selectivity, capacity, and rate of oil recovery. However, reusability is a critical component to consider in incidents with large‐scale spills. With the development of sorbent technology, some studies have progressed to explore surface engineering and material design for high oil sorption capacity and durability. Thus, this systemic review, a summary of sorbent developments, serves as a guide to understanding practical applications that can apply to large‐scale oil spills and recognize remaining issues. In this review, the oil weathering process and oil sorption mechanisms in relation to the characteristics of target pollutants are introduced. Then, this comprehensive review focuses on materials in advanced sorbents. These materials have properties including, aligned channels for fast sorption, self‐heating capabilities for viscous oil cleanup, and magnetic‐responsiveness to enhance a collection of final products. The perspective and challenges for the next generation of oil spills remediation technology‐based oil sorbents materials are finally presented in the last section.

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Section: Oil Removal Mechanisms Of Sorbentsmentioning

confidence: 99%

A Role for Newly Developed Sorbents in Remediating Large‐Scale Oil Spills: Reviewing Recent Advances and Beyond

Kim

Zhang

Chung

et al. 2021

Advanced Sustainable Systems

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“…Three-dimensional (3D) aerogels are one of the lightest solids in the world, with low density and high surface area and porosity, making them very suitable for applications such as absorption, − impacting energy damping, and impacting heat and acoustic insulation. , In particular, superhydrophobic aerogels, − whose hydrophobic surface can selectively adsorb the oil phase from oily wastewater, are regarded as an ideal material for cleaning oily pollution and separating oil/water mixtures. In the past few decades, various aerogels have been successfully applied to effectively remove oil pollutants. − More recently, by assembling MOFs on the surface of biomass fiber and then directly carbonizing them, carbon aerogels with the three-dimensional porous structure have been prepared to adsorb 35–119 times their own weight in organic pollutants .…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Waste Cardboard Aerogels as Effective and Reusable Oil Absorbents

Shi

Zhong

et al. 2021

Langmuir

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As the main component of the municipal waste, waste cardboard has caused a host of environmental problems. Therefore, the reasonable disposal of waste cardboard is of great significance to global sustainable development and green economics. Herein, using waste cardboard as the raw material, a superhydrophobic aerogel has been developed with a unique three-dimensional porous network structure, which exhibits excellent selective oil absorption capacities. The aerogel was made by combining Ca 2+ cross-links and postmodification with stearic acid. Superhydrophobic aerogels can absorb various organic solutions and its maximum absorption capacity can reach 47 times its own weight. Meanwhile, the size of aerogels has been further expanded, with a diameter of 21.2 cm and a height of 3.2 cm, which can absorb 34 times its own weight of kerosene. More importantly, the aerogel can also absorb oil droplets in oil/water emulsions with an adsorption efficiency of over 98.5%. Moreover, the aerogel can be employed multiple times without significantly reducing the adsorption capacity via distillation or squeezing, depending upon the type of pollutions. Consequently, we believe that these facile and inexpensive superhydrophobic aerogels can effectively adsorb oily wastewater, which matches well with the requirement for environmentally friendliness from the perspective of practical application.

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“…Aerogel, a type of highly porous material with extremely high specific surface area, ultralow density, and excellent thermal insulation performance, etc. has found broad application in the fields of energy reduction, environmental remediation, drug delivery, catalysis, and aerospace. − The building blocks of the aerogels are usually connected by weak physical interaction such as hydrogen bonding or van der Waals force (e.g., supramolecular aerogel, , graphene aerogel, − and cellulose aerogel, − ) or chemical bonding (e.g., silica aerogel − ). Both physical interaction and chemical bonding are too weak to resist capillary force occurred during the ambient pressure drying (APD) process.…”

Section: Introductionmentioning

confidence: 99%

Silica Aerogels with Self-Reinforced Microstructure for Bioinspired Hydrogels

Wang

et al. 2021

Langmuir

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Aerogel is a kind of high-performance lightweight open-porous solids with ultralow density, high specific surface area, and broad application in many emerging fields including biotechnology, energy, environment, aerospace, etc. A giant challenge remains in preventing of the hydrophilic aerogel framework shrinkage when replacing of solvent with air in its extremely abundant nanosized pores during its fabrication process in ambient conditions. In this work, started from a linear polymeric precursor with further condensation reaction, superhydrophilic silica aerogels with self-reinforced microstructure and the least volume shrinkage have been successfully obtained via ambient pressure drying process without use of any additives in the presence of a low surface tension solvent. The resulting superhydrophilic silica aerogels possess specific surface area up to 1065 m 2 /g, pore volume up to 2.17 cm 3 /g and density down to 84 mg/cm 3 , and these values are comparable to those of their counterparts obtained by supercritical CO 2 drying process. Moreover, as an application demonstration, the bioinspired hydrogels with desirable mechanical flexibility and adhesive performance at extremely harsh environment (e.g., below −50 °C) have been successfully synthesized by mimicking carrier of a functional bioagent with the resulting superhydrophilic silica aerogel microparticles. Our work has made a significant step forward for future high-performance hydrophilic aerogels with self-enhanced microstructures and the resulting superhydrophilic aerogels have shown great potentials in making functional hydrogels with bionic properties.

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Construction of a Superhydrophobic Sodium Alginate Aerogel for Efficient Oil Absorption and Emulsion Separation

Cited by 83 publications

References 57 publications

A Role for Newly Developed Sorbents in Remediating Large‐Scale Oil Spills: Reviewing Recent Advances and Beyond

A Role for Newly Developed Sorbents in Remediating Large‐Scale Oil Spills: Reviewing Recent Advances and Beyond

Superhydrophobic Waste Cardboard Aerogels as Effective and Reusable Oil Absorbents

Silica Aerogels with Self-Reinforced Microstructure for Bioinspired Hydrogels

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