John Libbey Eurotext

Environnement, Risques & Santé

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Zinc, copper, and manganese complexation by hemp: chemical abatement and ecotoxicological impact Volume 17, issue 3, May-June 2018

Figures

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Tables

Authors
1 UMR 6249 Chrono-environnement
Université de Bourgogne Franche-Comté
16, route de Gray
25000 Besançon
France
2 UMET UMR 8207
Ingénierie des systèmes polymères
Université de Lille 1
59655 Villeneuve d’Ascq
France
3 Eurochanvre
7, route de Dijon
70100 Arc-les-Gray
France
4 Istituto di Chimica e Biochimica G. Ronzoni
81 via G. Colombo
20133 Milano
Italy
5 University of Bucharest
PROTMED Research Centre
050663 Bucharest
Romania
* Tirés à part
  • Key words: complexation, metals, hemp, sorption, batch method
  • DOI : 10.1684/ers.2018.1174
  • Page(s) : 240-52
  • Published in: 2018

In this study, two hemp-based materials were used for the complexation of Cu, Mn, and Zn cations present in single and ternary solutions as a batch. The first material was a hemp-based felt (Hemp1). The second was hemp felt coated with a maltodextrin-1,2,3,4-butane tetracarboxylic polymer to give it ion-exchange properties (Hemp2A). The performance of Hemp2A was compared with those of non-modified felt under different experimental conditions, including contact time, initial metal concentration, pH, and presence of NaCl. For both single and ternary solutions, the contact time to reach equilibrium was found to be 10 minutes for Hemp1 and 45 minutes for Hemp2A. The adsorption process was independent of pH between 4 and 6 but dependent on the initial concentration above 25 mg/l and on the presence of NaCl for both materials. The order of abatement was Cu > Zn > Mn in both single and ternary systems, independent of the solution and material used. Hemp2A exhibited higher adsorption capacities, indicating the important role of the carboxylate groups favoring chemisorption (ion-exchange, electrostatic interactions). Preliminary adsorption tests performed on two real effluents showed that the materials exhibited high adsorption capacities for both metal pollution and organic load. Toxicity tests showed interesting environmental effects. Two bioassays based on the immobilization of a freshwater crustacean (Daphnia magna) and the germination rate of a specific lettuce (Lactuca sativa) were used. Biological tests confirmed the ability of the hemp-based materials to radically decrease the chemical toxicity of the effluent.