Phosphorylated nanocellulose papers for copper adsorption from aqueous solutions

Abstract

Copper is a major problem in industrial wastewater streams, seriously affecting the quality of potential drinking water. Several approaches, including continuous membrane processes or batch-wise application of adsorbents, are in use to tackle this problem. Unfortunately, these processes suffer from their particular drawbacks, such as low permeance or disposal of saturated adsorbents. However, a combination of these processes could constitute a step towards a more efficient copper removal solution. Here, we present a nanopaper ion-exchanger prepared from cellulose nanofibrils produced from fibre sludge, a paper industry waste stream, for the efficient, continuous removal of copper from aqueous solutions. This nanopaper ion-exchanger comprises phosphorylated cellulose nanofibrils that were processed into nanopapers by papermaking. The performance of these phosphorylated nanopaper membranes was determined with respect to their rejection of copper and permeance. It was shown that this new type of nanopaper is capable of rejecting copper ions during a filtration process by adsorption. Results suggest that functional groups on the surface of the nanopapers contribute to the adsorption of copper ions to a greater extent than phosphate groups within the bulk of the nanopaper. Moreover, we demonstrated that those nanopaper ion-exchangers could be regenerated and reused and that in the presence of calcium ions, the adsorption capacity for copper was only slightly reduced.

Microscopic and Spectroscopic Analyses of Selected Agricultural Formulations Containing Various nanostructures

“…The emergence of antibiotic-resistant bacteria has led to an increased use of silver and copper as an antimicrobial and detoxifying agent [21][22]. There are more than 100 Ag-containing pesticides.…”

Direct sulfation of cellulose fibers using a reactive deep eutectic solvent to produce highly charged cellulose nanofibers

“…The superior properties of nanocellulose can lead to the production of novel materials, such as flexible, lightweight green electronics, and even recyclable solar cells (Zhou et al 2013(Zhou et al , 2014. Nanocellulosic materials are also a source of biodegradable chemicals to be utilized, for example, in wastewater purification (Suopajärvi et al 2013;Sirviö et al 2015a;Mautner et al 2016;Venäläinen and Hartikainen 2018).…”

Modified/Unmodified Nanoparticle Adsorbents of Cellulose Origin With High Adsorptive Potential for Removal of Pb(II) From Aqueous Solution

“…3-as the FT-IR of the synthesized nanoparticles revealed the presence of the phosphate ester groups around 900-1003 cm -1 for P-O, P-O-C and P-OH which appeared as shoulder vibrations while P=O bond vibration was observed around 1203 cm -1 on the nanomaterial`s surface (Mautner et al 2016;Azeh et al 2017). The presence of these groups have been reported to show high tendency of complexing with divalent metal ions through surface complexation mechanisms.…”