Pilot-scale foam and cast-coated nanocellulose filters for water treatment

Khatanbaatar Byambatsogt, Qixiang Jiang, Aayush Kumar Jaiswal, Vesa Kunnari, Alexander Bismarck, Andreas Mautner (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

Abstract

A large variety of substances, for instance heavy metal ions from different sources including mining, industry, and agricultural activities, pollute fresh water sources. Bio-based adsorbents, such as cellulose nanofibers (CNF), have recently been introduced in the process of treating water to remove hazardous pollutants primarily owing to their natural abundance, non-toxicity, and renewability. Surface modification of CNF, e.g. by catalytically oxidising the primary C6-OH groups of CNF selectively into carboxylic (COO) groups with TEMPO, yields materials that are effective in adsorbing positively charged heavy metal ions, e.g. Cu ions. However, to utilise CNF in continuous processes beyond static, batch-wise adsorption, in particular on (pre-)industrial scale, they need to be immobilised on filter substrates in thin layers and an efficient manner. In this work, we report bio-adsorbent-based filters prepared by coating TEMPO-CNF on viscose filters using two different pilot-scale coating approaches, foam and cast coating. The performance of TEMPO-CNF filters was evaluated in terms of their water permeance as well as adsorption of metal ions including Cu(II) and Ca(II). By foam coating thin layers could be fabricated in a time efficient way facilitating high adsorption capacities (52 mg g−1), whilst by cast coating higher amounts of TEMPO-CNF could be deposited allowing for adsorbing higher absolute amounts (280 mg m−2) of heavy metal ions. Graphical abstract: (Figure presented.)

Original languageEnglish
Number of pages11
JournalMonatshefte fur Chemie
DOIs
Publication statusE-pub ahead of print - 17 May 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • Carbohydrates
  • Coating
  • Foaming
  • Membranes
  • Nanocellulose
  • Surfactants

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