Cellulose Nanofibril/Carbon Nanomaterial Hybrid Aerogels for Adsorption Removal of Cationic and Anionic Organic Dyes

Abstract

Advances in nanoscale science and engineering are providing new opportunities to develop promising adsorbents for environmental remediation. Here, hybrid aerogels are assembled from cellulose nanofibrils (CNFs) and carbon nanomaterials to remove cationic dye methylene blue (MB) and anionic dye Congo red (CR) in single and binary systems. Two classes of carbon nanomaterials, carbon nanotubes (CNTs) and graphene nanoplates (GnPs), are incorporated into CNFs with various amounts, respectively. The adsorption, mechanics and structure properties of the hybrid aerogels are investigated and compared among different combinations. The results demonstrate CNF–GnP 3:1 hybrid exhibits the best performance among all composites. Regarding a single dye system, both dye adsorptions follow a pseudo-second-order adsorption kinetic and monolayer Langmuir adsorption isotherm. The maximal adsorption capacities of CNF–GnP aerogels for MB and CR are 1178.5 mg g−1 and 585.3 mg g−1, respectively. CNF–GnP hybrid show a superior binary dye adsorption capacity than pristine CNF or GnP. Furthermore, nearly 80% of MB or CR can be desorbed from CNF–GNP using ethanol as the desorption agent, indicating the reusability of this hybrid material. Hence, the CNF–GnP aerogels show great promise as adsorption materials for wastewater treatment.

Studying the Adsorptive Behavior of Poly(Acrylonitrile-co-Styrene) and Carbon Nanotubes (Nanocomposites) Impregnated with Adsorbent Materials towards Methyl Orange Dye

“…In addition, Zare et al [ 22 ] studied the elimination of noxious Congo dye by MWCNTs from aquatic solutions and concluded that it has an excellent potential of 92%, with a q max of 352.10 mg g −1 of dye. Recently, Yu et al [ 23 ] used carbon nanocompounds for the removal of methylene blue and congo red dyes from aqueous solution. The maximum capacity of the adsorption process was found to be methylene blue and congo red at the levels of 1387.2 and 351.7 mg g −1 .…”

Sawdust-Based Cellulose Nanocrystals Incorporated with ZnO Nanoparticles as Efficient Adsorption Media in the Removal of Methylene Blue Dye

“… 2 Dyes have been reported as one of the dangerous organic pollutants that require urgent attention because they are composed of many chemicals. 3 , 4 The major sources of dyes in water bodies are effluents from textile, paper, rubber, plastics, paints, printing, and leather industries. 5 , 6 The most commonly used dye in textiles and printing industries is methylene blue (MB).…”

Adsorption Processes in the Removal of Organic Dyes from Wastewaters: Very Recent Developments

“…Methylene blue functionalized-organic polymer 2740 [55] cellulose hydrogel 756 [56] modified grapheme oxide 257 [57] functionalized lignosulfate 63 [58] Methyl orange NiAlTi 1250 [59] MIL-101-NH 2 462 [60] polyaniline composite 148 [26] Crystal violet fly ash 433 [61] polyaniline-metal oxides 50 [24] Congo red MIL-100(Fe) 1791 [31] cellulose/carbon aerogels 585 [43] polyaniline-metal oxides 33 [24] Rhodamine B Ni-graphene composite 963 [14] MoS 2 nanoflowers 365 [62] polyaniline-metal oxides 20 [24]…”