title: Liquid crystal polaroid glass electrode from e-waste for synchronized removal/recovery of Cr(+6) from wastewater by microbial fuel cell.
abstract: This study demonstrates the use of Liquid Crystal coated Polaroid Glass Electrode (LCPGE) material collected from disposed liquid-crystal display (LCD) computer monitor as electrodes in microbial fuel cell (MFC) for the simultaneous reduction/recovery of Cr(+6) from chromium wastewater. Fourier transform infrared spectrum (FT-IR) confirms the presence of NH2, CN, CO and OC and/or COC functional groups in LCPGE. An excellent electrochemical performance with distinct redox peaks were observed in cyclic voltammetry test (100 mV/s). The maximum current density of 110 mA/m(2) (10 mW/m(2)) was achieved by operating MFC in batch mode. At the cathode LCPGE (10.5 cm(2)) interface, toxic Cr(+6) ions readily accepted electrons and formed nontoxic Cr2O3 as confirmed by FT-IR and X-ray photoelectron spectroscopy analysis. Moreover, electrochemical impedance analysis shows that bacteria were readily attached to the surface of LCPGE (10.5 cm(2)) within 24 h in a Bioelectrochemical System (BES).
authors.affiliation: Environmental and Water Resources Division, Department of Civil Engineering, Indian Institute of Technology, Madras, 600036, India.
authors.forename: Praveena
authors.initials: P
authors.lastname: Gangadharan
authors.affiliation: Environmental and Water Resources Division, Department of Civil Engineering, Indian Institute of Technology, Madras, 600036, India. Electronic address: indunambi@iitm.ac.in.
authors.forename: Indumathi M
authors.initials: IM
authors.lastname: Nambi
authors.affiliation: Environmental and Water Resources Division, Department of Civil Engineering, Indian Institute of Technology, Madras, 600036, India.
authors.forename: Jaganathan
authors.initials: J
authors.lastname: Senthilnathan
mesh_terms: D001674:Bioelectric Energy Sources / Q000382:microbiology*; D018441:Biofilms; D002857:Chromium / Q000302:isolation & purification*; D017097:Electric Impedance; D004560:Electricity; D055664:Electrochemical Techniques; D004566:Electrodes; D059029:Electronic Waste / Q000032:analysis*; D005898:Glass / Q000737:chemistry*; D050866:Liquid Crystals / Q000737:chemistry*; D013997:Time Factors; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D002857:Chromium; D062065:Wastewater; D014874:Water Pollutants, Chemical; C074702:chromium hexavalent ion
keywords: Conducting polaroid glass; E-waste; Hexavalent chromium; Liquid crystal; Microbial fuel cell (MFC)