Nanocellulose/graphene oxide layered membranes: elucidating their behaviour during filtration of water and metal ions in real time

Abstract

In situ SAXS and reactive molecular dynamics (ReaxFF) computational simulations of water and metal ion interaction with CNF–GO layered membranes.

Bio-elastomer nanocomposites reinforced with surface-modified graphene oxide prepared via in situ coordination polymerization

“…[9][10][11][12] In the case of graphene oxide, which is a rather economical (though non-conductive) alternative of graphene, a major problem as nanoller is the lack of interfacial bonding with the polymer matrix (due to its high hydrophilicity), therefore leading to poor dispersion and agglomeration of the nanosheets. [13][14][15] Nevertheless, GO has a vast amount of reactive functional groups, such as hydroxyl, epoxy, and carbonyl groups, [16][17][18][19][20] which provide reactive sites for surface modifying the nanosheets to tailor specic properties, such as enhancing their compatibility with polymer matrices. 15,21 Even though different surface modication techniques in GO have been previously explored, [22][23][24][25] in this work we take advantage of the high reactivity of alkylamines to modify the surface of GO.…”

Cellulose-Based Materials for Water Remediation: Adsorption, Catalysis, and Antifouling

“…The molecular dynamics simulations data confirm the motion of the metal (Cu 2+ and Ag + ) ions into the membrane for the formation of metal clusters during adsorption (Figure 5) (Zhu et al, 2018). The high adsorption performance of the prepared membrane is mainly due to the synergistic effect of GO and CNFs (Valencia et al, 2019). GO/carboxymethyl cellulose nanofibril (CMCNF)-Fe 3+ exhibited high adsorption efficiency for Pb 2+ with good adsorbent recovery (Yu et al, 2020).…”

“…; for e.g., hybrid materials that show high mechanical properties and offer high adsorption capacities (Table 2). Nanocellulose-graphene oxide (GO) membranes were reported for the adsorption of metal ions (Cu 2+ and Ag + ) from aqueous solutions (Zhu et al, 2017(Zhu et al, , 2018Valencia et al, 2019). The adsorption process was followed in real-time using insitu small-angle X-ray scattering (SAXS) and reactive molecular dynamics (ReaxFF) computational simulations (Figure 5).…”

“…A study reported that the adsorption capacity of anionic dyes via quaternized cellulose nanofibrils using trimethylammonium chloride (TMAC) was increased with the increasing of TMAC's content on cellulose nanofibrils (Pei et al, 2013). Cationic cellulose nanofibers containing positively charged quaternary ammonium groups (QCNF) were synthesized from waste pulp residues (Sehaqui et al, (Valencia et al, 2019). This Open Access Article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.…”

Nanocellulose as a sustainable material for water purification

“…The high rejection rate, structural stability, high flux, and easy preparatory method makes the GO‐CNF membranes a worthy contender for membranes currently adopted for water remediation, food industry, and biomedicine. [ 112 ] From the tests conducted by Valencia et al, [ 113 ] the results showed that the enhanced wet mechanical properties arose from the prevention of expansion of the CNF network during water filtration due to the incorporation of a GO layer, which also appeared to protect the cellulose network from variations in the structure during re‐drying hence preventing dramatic collapse as occurs in a pristine CNF membrane.…”