Cellulose‐based formaldehyde adsorbents with large capacities: Efficient use of polyethylenimine for graphene oxide stabilization in alkaline–urea system

Abstract

A cellulose-based polyethylenimine modified graphene oxide (PEI-GO) composite aerogel is fabricated through the alkalineurea aqueous system. Inspired from the performance of nanocarriers in gene delivery, this article proposes a pathway to disperse GO in the green environment with strong electrolyte concentrations via the decorated branched PEI. The entire aqueous system shows good miscibility and stability. Meanwhile, the dynamic light scattering results indicate that PEI-GO and cellulose chains become entangled to form a new supramolecular complex in the alkaline-urea solution, and a "hand" model is devised accordingly. The efficient dispersion of PEI-GO (1-0.1%) over the entire cellulose support structure (3%) enables the resultant aerogel to exhibit a gaseous formaldehyde adsorption capacity, that is, 8.51 times greater than the pure cellulose aerogel under ambient temperatures. This dual function opens up enormous opportunities to process cellulose-based GO materials in this green and inexpensive solvent with strong electrolyte concentrations.

Impact of CeO2 nanoparticles on the aggregation kinetics and stability of polystyrene nanoplastics: Importance of surface functionalization and solution chemistry

“…PS-NH 2 would remain stable in seawater or in electrolyte solutions, as already reported in previous studies ( Dong et al, 2019 ;Yu et al, 2019 ). The high stability of PS-NH 2 may be derived from the branched polymer PEI chain layer on the surface of the PS NPs, which provides steric repulsion to overcome the electrostatic attraction Ying et al, 2019 ). Overall, the difference in CCC values shows that surface functional groups have significant influences on the colloidal stability of PS NPs ( Gewert et al, 2015 ;Yu et al, 2019 ).…”

Preparation of amino cellulose aerogel and its formaldehyde adsorption properties

“…In addition, the grafting of PEI onto the hydroxyl groups of cellulose by adding cross-linking agents can alleviate the reduction of the speci c surface area of aerogels and improve the adsorption capacity of aerogels. Yin et al (Yin et al 2019) effectively dispersed graphene oxide with modi ed PEI in alkaline urea aqueous solution, and then constructed cellulose-based aerogel, and successfully adsorbed formaldehyde, but the adsorption effect for formaldehyde was not good.…”

Preparation of Microcrystalline Cellulose/N-(2-aminoethyl)-3- Aminopropyl Methyl Dimethoxysilane Composite Aerogel and Adsorption Properties for Formaldehyde

“…Therefore, many adsorbents, such as SiO 2 [18,19], Al 2 O 3 [20], MOFs [21] and microporous carbonaceous materials [22,23], have been widely studied for indoor formaldehyde adsorption and removal. In recent years, various novel materials, such as active carbon fibers (ACFs), carbon nanotubes (CNTS), graphene, metal-organic skeletons (MOF) and porous organic polymers (pops) [7,9,22,24,25], have been introduced as effective adsorbents for removing HCHO. The adsorption performance of nitrogencontaining porous materials for HCHO is better than that of common adsorbents, and the adsorption performance is closely related to the type and content of surface nitrogen [26].…”