Adsorptive textiles for urban mining

T. Mayer-Gall*, K. Opwis, S. Gutmann, Deutsches Textilforschungszentrum Nord-West GmbH, Germany

It is well known that polyvinylamine (PVAm) forms complexes with different metals. We have developed a simple and effective padding process for the finishing of Polyethylene terephthalate (PET) woven and nonwoven fabrics with PVAm.2 The modified textiles adsorb a wide array of metal cations e.g. Cu2+, Ni2+ or Ag+ and anions such as [CrO4]2-, [PdCl4]2- or [PtCl4]2- with high adsorption capacities and fast kinetics. The adsorption properties for palladium are illustrated.

We have detected two main application areas based for our innovative adsorptive textiles. One application area is environmental remediation. The PVAm-modified substrates are able to reduce the chromate concentration in ground water samples from 50 mg/L to < 50 µg/L.3

The second useful area is the recovery of metals from low concentrated industrial process waters of metalworking and chemical industries, where an electrochemical recycling process is non-profitable. As an example, we report recovery results for Pd from low concentrated process waters of a circuit board producer. An almost complete removal of Pd from the treated waters was achieved. For industrial applications this method has the advantage being easily applied on the production site. The recovery process is more economical for Pd waste water. By textile based adsorbent about 90 % of the Pd value is redeemed in comparison to 40 % for conventional methods...

Session: L19 - Depth Filtration III
Day: 13 October 2016
Time: 13:00 - 14:15 h

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