Preparation of Silver Nanoparticle-based sensor for the electrochemcialdetection of thiourea in leaching solutions of waste and electronic equipment

AGUSTÍN TASHDJIAN, IGNACIO PEDRE, FERNANDO BATTAGLINI, GLADIS J. LABRADA DELGADO, M. GUADALUPE SÁNCHEZ-LOREDO, GRACIELA A. GONZÁLEZ; MARÍA GUADALUPE SANCHEZ LOREDO, GRACIELA ALICIA GONZÁLEZ; GRACIELA ALICIA GONZÁLEZ

ELECTROANALYSIS

WILEY-V C H VERLAG GMBH

Lugar: Weinheim; Año: 2013 vol. 25 p. 2124 - 2129

1040-0397

Waste of electrical and electronic equipment is an interesting secondary resource of base and precious metals. Particularly the use of thiourea-leaching in acidic medium was proposed for noble metals recovery. In this work, a novel and easy-to-use electrochemical sensor was developed, aimed to test thiourea from leaching solutions containing significant thiourea and copper amounts. The sensor was constructed using silver nanoparticles (AgNPs) deposited on screen-printed electrodes. Its performance was studied in a synthetic leaching solution; changes in the overall surface charge of AgNPs resulting in changes in the charge-transfer resistance for the copper ions were evaluatedby electrochemical impedance spectroscopy.