Precipitated silica agglomerates reinforced with cellulose nanofibrils as adsorbents for heavy metals

Abstract

PSA was inexpensively ameliorated by cellulose nanofibrils reinforcement. The resultant sponge with mechanically strong skeleton was evaluated as an excellent adsorbent for heavy metals.

Critical Review of Bioadsorption on Modified Cellulose and Removal of Divalent Heavy Metals (Cd, Pb, and Cu)

“…Table summarizes the reusability efficiency and adsorption desorption studies of various bioadsorbents. Here, 99.5% efficiency was displayed by cellulose nanifibrils . No change in reusability efficiency of cellulose hydrogel for Cu 2+ adsorption was observed by Chen et al up to six cycles.…”

“…Here, 99.5% efficiency was displayed by cellulose nanifibrils. 151 No change in reusability efficiency of cellulose hydrogel for Cu 2+ adsorption was observed by Chen et al 193 up to six cycles. Liu et al 233 investigated reusability of cellulose beads for Cu 2+ adsorption up to 30 cycles with an efficiency of 92%.…”

“…Agaba et al cross-linked precipitated silica agglomerates with TEMPO-oxidized cellulose nanofibers in the presence of 3-aminopropyltriethoxysilane in order to enhance mechanical strength and reduce brittleness in silica-containing materials. The adsorbent obtained exhibited maximum adsorption efficiencies of 157.7 mg g –1 for Pb 2+ and 130.5 mg g –1 for Cd 2+ .…”

“…Agaba et al 151 cross-linked precipitated silica agglomerates with TEMPO-oxidized cellulose nanofibers in the presence of 3aminopropyltriethoxysilane in order to enhance mechanical strength and reduce brittleness in silica-containing materials. The adsorbent obtained exhibited maximum adsorption efficiencies of 157.7 mg g −1 for Pb 2+ and 130.5 mg g −1 for TEMPO-facilitated oxidation demonstrated regioselectivity for the primary −OH group attached to a C-6 atom over the other secondary −OH groups on cellulose leading to a limited count of anionic sites on the biosorbent.…”

The effect of nanocrystalline cellulose and TEMPO-oxidized nanocellulose on the compatibility of polypropylene/cyclic natural rubber blends

“…30,31 As an individualized fiber which is supported with high ratio of its dimension, the TEMPO-oxidized nanocellulose can improve the compatibility of polymer blend as a reinforcement agent. [32][33][34][35] The comparative effect of nanocrystalline cellulose and TEMPO-oxidized nanofiber as additives or nanofillers in the nanocomposite has yet to be explored, especially in the blend of polypropylene and cyclic natural rubber (PP/CNR). The blend of PP/CNR is an example of immiscible blend.…”