Abstract
A novel Graphene oxide/Laponite RD/Chitosan ternary composite was synthesized by sol-gel method and freeze-drying method. The Laponite RD was silanized by 3-aminopropyltriethoxysilane (APTES). Graphene oxide (GO) was prepared by an improved Hummers method. Under the acidic conditions, self-assembly recombination was realized by electrostatic interaction between modified Laponite RD and GO. The results from Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy confirmed that the modified Laponite RD was successfully compounded with GO, and the composite is laminated and stacked. The results from BET (Brunauer–Emmett–Teller) methods found that the BET-specific surface area of the hybrid aerogel significantly increased with the increase of the doping content of the composite, and the specific surface area of the aerogel composite with 20% doping content reached 81 m2/g. The structure of aerogel is porous, and there are numerous holes in the interior, which is closely related to adsorption properties. Thermogravimetric analysis (TG) test was used to explore the change of thermal properties of hybrid aerogel materials, and it was found that the addition of composite increased the initial decomposition temperature and thermal stability of hybrid aerogel. Finally, the potential applications of aerogel were tested, such as methylene blue adsorption and CO2 adsorption.
Highlights
The discharge of flue gas and wastewater has become a global concern, because many of the colored dyes in the wastewater are not biodegradable, and excessive emissions of flue air such as carbon dioxide will lead to serious climate change [1,2,3,4]
Laponite RD was purchased from Rockwood Lithium. 3-aminopropyl triethoxysilane (APTES), hydrochloric acid (37 wt%), methylbenzene, acetic acid and ethanol were purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China)
Conventional Laponite RD is hard to combine with Graphene oxide (GO)
Summary
The discharge of flue gas and wastewater has become a global concern, because many of the colored dyes in the wastewater are not biodegradable, and excessive emissions of flue air such as carbon dioxide will lead to serious climate change [1,2,3,4]. As for the colorful dyes, the coping strategies are chemical oxidation, membrane filtration, ion exchange and adsorption [5,6,7]. Most of these strategies are costly and unsustainable. Aerogel is a kind of nanomaterial with special structure that has many special physical and chemical properties and has potential application prospect in many aspects such as catalyst loading, medical biomaterials, selective adsorption materials and filtration materials [8,9,10]. Harris and McNeil synthesized one localized hydrogel based on cellulose nanofibers and wood pulp [1] They developed a rapid, locally formed hydrogel that adsorbs dye during gelation.
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