title: Degradation of organic pollutants by Ag, Cu and Sn doped waste non-metallic printed circuit boards.
abstract: The disposal and reuse of waste printed circuit boards have been the major global concerns. Printed circuit boards, a form of Electronic waste (hereafter e-waste), have been chemically processed, doped with Ag+, Cu2+and Sn2+, and used as visible light photocatalysts against the degradation of methylene blue and methyl violet. The elemental analyses of pristine and metal doped printed circuit board were obtained using energy dispersive X-ray fluorescence (EDXRF) spectra and inductively coupled plasma optical emission spectroscopy (ICP-OES). The morphology of parent and doped printed circuit board was obtained from scanning electron microscopy (SEM) measurements. The photocatalytic activity of parent and metal doped samples was carried out for the decomposition of organic pollutants, methylene blue and methyl violet, under visible light irradiation. Metal doped waste printed circuit boards (WPCBs) have shown higher photocatalytic activity against the degradation of methyl violet and methylene blue under visible light irradiation. Scavenger experiments were performed to identify the reactive intermediates responsible for the degradation of methylene blue and methyl violet. The reactive species responsible for the degradation of MV and MB were found to be holes and hydroxyl radicals. A possible mechanism of degradation of methylene blue and methyl violet is given. The stability and reusability of the catalysts are also investigated.
authors.affiliation: Centre for Materials for Electronics Technology (CMET), Cherlapally, HCl (PO), Hyderabad 500051, India.
authors.forename: Kadari
authors.initials: K
authors.lastname: Ramaswamy
authors.affiliation: Centre for Materials for Electronics Technology (CMET), Cherlapally, HCl (PO), Hyderabad 500051, India.
authors.forename: Velchuri
authors.initials: V
authors.lastname: Radha
authors.affiliation: Department of Chemistry, Osmania University, Hyderabad 500 007, India.
authors.forename: M
authors.initials: M
authors.lastname: Malathi
authors.affiliation: Department of Chemistry, Osmania University, Hyderabad 500 007, India. Electronic address: mugavithal@gmail.com.
authors.forename: Muga
authors.initials: M
authors.lastname: Vithal
authors.affiliation: Centre for Materials for Electronics Technology (CMET), Cherlapally, HCl (PO), Hyderabad 500051, India. Electronic address: rathnam1960@gmail.com.
authors.forename: Nagegownivari R
authors.initials: NR
authors.lastname: Munirathnam
mesh_terms: D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D059029:Electronic Waste / Q000032:analysis; D004785:Environmental Pollutants / Q000737:chemistry*; D005840:Gentian Violet / Q000737:chemistry; D017665:Hydroxyl Radical / Q000737:chemistry; D008751:Methylene Blue / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D055668:Photochemical Processes; D011208:Powders; D012834:Silver / Q000737:chemistry; D013052:Spectrometry, X-Ray Emission; D014001:Tin / Q000737:chemistry; D018505:Waste Management / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D004396:Coloring Agents; D004785:Environmental Pollutants; D011208:Powders; D017665:Hydroxyl Radical; D012834:Silver; D014001:Tin; D003300:Copper; D005840:Gentian Violet; D008751:Methylene Blue
keywords: E-waste; Elemental doping; Photocatalytic activity; Printed circuit board; Scavenger