Grenda Kinga, Arnold Julien, Gamelas José A F, Rasteiro Maria G
Department of Chemical Engineering, CIEPQPF - Chemical Process Engineering and Forest Products Research Centre, University of Coimbra, Rua Sílvio Lima, 3030-790 Coimbra, Portugal E-mail:
AQUA + TECH Specialities, Chemin du Chalet-du-Bac 4, CH-1237 Avully, Geneva, Switzerland.
Water Sci Technol. 2017 Sep;76(5-6):1490-1499. doi: 10.2166/wst.2017.299.
Natural-based polyelectrolytes (PELs), with all the advantages coming from being produced from renewable and biodegradable sources, are a potential solution for the removal of dyes from wastewater. In this work, surplus Eucalyptus bleached cellulose fibres from a paper mill were modified to increase the charge and solubility of cellulose. First, reactive aldehyde groups were introduced in the cellulose backbone by periodate oxidation of cellulose. Further modification with alkylammonium produced positively charged cellulose-based PELs. The final products were characterized by several analytical techniques. The PEL with the highest substitution degree of cationic groups was evaluated for its performance in decolouration processes, bentonite being used as aid. This was found to be effective for colour removal of either anionic or cationic dyes. Bio-PELs can thus be considered as very favourable eco-friendly flocculation agents for decolouration of harsh effluents from several industries, considering their biodegradable nature and thus the ability to produce less sludge.
基于天然的聚电解质（PELs）具有源自可再生和可生物降解来源所带来的所有优势，是去除废水中染料的一种潜在解决方案。在这项工作中，对造纸厂多余的桉木漂白纤维素纤维进行了改性，以增加纤维素的电荷和溶解度。首先，通过纤维素的高碘酸盐氧化在纤维素主链中引入反应性醛基。用烷基铵进一步改性产生带正电的纤维素基PELs。最终产物通过几种分析技术进行了表征。对阳离子基团取代度最高的PEL在脱色过程中的性能进行了评估，膨润土用作助剂。结果发现，这对于去除阴离子或阳离子染料的颜色均有效。考虑到生物PELs的可生物降解性质以及因此产生较少污泥的能力，它们可被视为用于使多个行业的苛刻废水脱色的非常有利的环保絮凝剂。
