Polydopamine-Modified Cellulose Nanofibril Composite Aerogel: An Effective Dye Adsorbent

Abstract

In this study, a new cellulose nanofibril (CNF) composite aerogel was fabricated using a green and facile mussel-inspired coating strategy. First, the CNF hydrogel was crosslinked by calcium ion followed by immersion in dopamine solution. Second, the surface of CNF was modified using polydopamine (PDA) to obtain PDA@CNF (PCNF) composite aerogel. The PCNF composite aerogels had large surface areas (368.15 m2/g) and low bulk density (27.2 mg/cm3). The composite aerogel exhibited improved mechanical properties, which were almost three times compared with those of CNF aerogel. Moreover, PCNF composite aerogel had good resilience under a wet state. The PDA functional layer remarkably enhanced the adsorption capacities of the composite aerogel for methylene blue (MB). The maximum adsorption of MB was 208 mg/g at an initial dye concentration of 50 mg/L. The adsorption isotherm and kinetic behaviors of the composite aerogel were consistent with Langmuir and pseudo-second-order models. In addition, the PCNF composite aerogels had a high adsorption capacity over a wide pH range. The reuse experiment showed that the removal efficiency of the composite aerogel remained higher than 85% after five cycles. Therefore, PCNF composite aerogels may have potential application in wastewater treatment due to its environmental sustainability and low energy consumption.

Mussel-inspired polydopamine-modified silk nanofibers as an eco-friendly and highly efficient adsorbent for cationic dyes

“…30 Lin et al prepared stomatocyte-like PDA hollow nanoparticles with a high adsorption capacity (2896 mg g −1 ) for MB. 31 Recently, PDA and its derivatives have successfully been adopted to modify different types of nanofibers, such as cellulose nanofibrils (CNF) 32 and electrospun poly(vinylidene fluoride) fibers (PVDF). 33 The resulting PDA-modified nanofibers are well-dispersed and show excellent adsorption capacity for different pollutants in water.…”

Magnetic hydroxyethyl cellulose spheres with efficient congo red removal

“…To overcome the issue, it is essential that high adsorption capacity components for pollutants are combined with cellulose, or cellulose is modified by functional groups which are able to interact with pollutants. For example, cellulose nanocrystal/graphene oxide nanocomposite (Shi et al 2014, Zaman et al 2020, cellulose nanocrystals incorporated with zinc oxide (Oyewo et al 2020), cellulose nanofibril coated with polydopamine (Huo et al 2022), and cellulose nanofibril/rectorite composite can be applied as adsorbents for the removal of toxic dye methylene blue from aqueous solution (Chen et al 2022). The materials of cellulose nanocrystal/microfibril modified by carboxyl groups can adsorb methylene blue (Wu et al2020, acrylic acid and acrylamide grafted cellulose powders (100 mesh) for acid blue 93 and methylene blue (Liu et al 2015), glycidyl methacrylate and diethylenetriamine pentaacetic acid modified epoxy cellulose for malachite green and basic fuchsine (Zhou et al 2013), phytic acid and tannin functionalized microcrystalline cellulose for cationic dye (Yuan et al 2022), polyethyleneimine modified cellulose nanofibers for methyl orange (Zhang et al 2022), trimethylammonium grafted cellulose for Eosin Y (Feng et al 2020), ionic liquid modified cellulose for Eosin Y (Wan et al…”

Gummy Nanoparticles with Glassy Shells in Electrostatic Nanocomposites

“…Tuning the properties of polymer nanocomposites has been of interest in the field of soft functional materials for many years. − Improving properties such as modulus, toughness, and conductivity can be achieved by introducing nanofillers. These nanofillers are usually inorganic such as silica − and other metal oxides, or gold, or are combined with organic building blocks such as nanocellulose, , block copolymers, and vitrimers. Specific interactions can occur between particles and their constituents on the nano scale leading to unique architectures and properties. ,, For example, cross-linked polydimethylsiloxane, PDMS, or “silicone rubber” often contains a dispersion of nanosilica to impart toughness.…”

“…1−5 Improving properties such as modulus, 6 toughness, and conductivity can be achieved by introducing nanofillers. These nanofillers are usually inorganic such as silica 7−9 and other metal oxides, or gold, 10 or are combined with organic building blocks such as nanocellulose, 11,12 block copolymers, 4 and vitrimers. Specific interactions can occur between particles and their constituents on the nano scale leading to unique architectures and properties.…”