Loughborough University
Leicestershire, UK
LE11 3TU
+44 (0)1509 263171
Loughborough University

Loughborough University Institutional Repository

Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/23588

Title: Photoelectrochemical cell for simultaneous electricity generation and heavy metals recovery from wastewater
Authors: Wang, Dawei
Li, Yi
Li Puma, Gianluca
Lianos, Panagiotis
Wang, Chao
Wang, Peifang
Keywords: Photoelectrochemical cell
Wastewater treatment
Heavy metals reduction
Electricity generation
Issue Date: 2017
Publisher: © Elsevier
Citation: WANG, D. ... et al., 2017. Photoelectrochemical cell for simultaneous electricity generation and heavy metals recovery from wastewater. Journal of Hazardous Materials, 323, Part B, pp.681-689.
Abstract: The feasibility of simultaneous recovery of heavy metals from wastewater (e.g., acid mining and electroplating) and production of electricity is demonstrated in a novel photoelectrochemical cell (PEC). The photoanode of the cell bears a nanoparticulate titania (TiO2) film capped with the block copolymer [poly(ethylene glycol)-b-poly(propylene glycol)-b-poly(ethylene glycol)] hole scavenger, which consumed photogenerated holes, while the photogenerated electrons transferred to a copper cathode reducing dissolved metal ions and produced electricity. Dissolved silver Ag+, copper Cu2+, hexavalent chromium as dichromate Cr2O72− and lead Pb2+ ions in a mixture (0.2 mM each) were removed at different rates, according to their reduction potentials. Reduced Ag+, Cu2+ and Pb2+ ions produced metal deposits on the cathode electrode which were mechanically recovered, while Cr2O72− reduced to the less toxic Cr3+ in solution. The cell produced a current density Jsc of 0.23 mA/cm2, an open circuit voltage Voc of 0.63 V and a maximum power density of 0.084 mW/cm2. A satisfactory performance of this PEC for the treatment of lead-acid battery wastewater was observed. The cathodic reduction of heavy metals was limited by the rate of electron-hole generation at the photoanode. The PEC performance decreased by 30% after 9 consecutive runs, caused by the photoanode progressive degradation.
Description: This item is closed access until 19/10/2017.
Sponsor: The study was financially supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (51421006), the National Natural Science Foundation of China (51322901 and 51479066), the Research Fund for innovation team of Ministry of Education (IRT13061), the Fundamental Research Funds for the Central Universities (No. 2014B02914, 2015B02114 and 2014B07614), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
Version: Accepted for publication
DOI: 10.1016/j.jhazmat.2016.10.037
URI: https://dspace.lboro.ac.uk/2134/23588
Publisher Link: http://dx.doi.org/10.1016/j.jhazmat.2016.10.037
ISSN: 0304-3894
Appears in Collections:Closed Access (Chemical Engineering)

Files associated with this item:

File Description SizeFormat
23588.pdfAccepted version4.62 MBAdobe PDFView/Open

 

SFX Query

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.