Bifunctional Titania Float for Metal Ion Reduction and Organics Degradation, via Sunlight

Abstract

The present study demonstrates the use of a bifunctional titania float in sunlight to cause the simultaneous oxidation of formic acid and reduction of Cr(VI) to Cr(III). Nanosized anatase TiO2 was synthesized by wet chemical methods and characterized by various microscopy and spectroscopy techniques. A float has been fabricated with the above nanopowder for water purification via sunlight-mediated photocatalysis. The impractical reduction of chromium in sunlight was made feasible by the use of photoactive nanotitania, unlike the UV light, which requires only the acid for complete reduction of chromium. The organic’s (formic acid) degradation and Cr(VI) reduction were observed to support each other till the completion of both oxidation and reduction, respectively. Formic acid with the catalyst (in the form of a float) in sunlight causes indirect scavenging of holes to enhance the catalytic efficiency and bring up the reduction rate on par with UV light, making the water purification an environmentally friendly and recyclable process.

Multifunctional Floating Titania‐Coated Macro/Mesoporous Photocatalyst for Efficient Contaminant Removal

“…[46] After different photocatalytic reaction times, the concentration of RhB, MO, or MB was analyzed with a Shimadzu Model UV2550 spectrophotometer, and the concentration of Cr VI was measured by inductively coupled plasma-atomic emission spectrometry (Optima 7000DV, PE, USA). In addition, the mineralization ratios of RhB, MO, and MB were examined using TOC-VCPN after reaction.…”

Preparation and Characterization of Chitosan Thin Films on Mixed-Matrix Membranes for Complete Removal of Chromium

“…At basic pH it exists as CrO 4 2− , which shows an absorption peak at λ max =370 nm (inset of Figure ). In the acidic range it exists mainly in HCrO 4 − and Cr 2 O 7 2− forms, which show two intense absorption peaks at λ max =255 and 350 nm (Figure ); these species have greater oxidation power than CrO 4 2− , and hence chromium reduction is feasible only in acidic medium.…”

Synthetic Progress in cMyc‐Max Oncoprotein Miniaturization: Semi‐Online Monitoring Gives Solid‐Phase Access to Hydrophobic b(‐HLH‐)ZIP Peptidosteroid Tweezers (Eur. J. Org. Chem. 4/2013)

“…The experimental site was in Harbin, oriented at 44°04′ N and 125°42′ E. All the sunlight experiments were conducted around the midyear of 2013 at midday during the maximum solar irradiation with an average light intensity of 1000 W m −2 (measured with Solar Power Meter SM206) 46. After different photocatalytic reaction times, the concentration of RhB, MO, or MB was analyzed with a Shimadzu Model UV2550 spectrophotometer, and the concentration of Cr VI was measured by inductively coupled plasma‐atomic emission spectrometry (Optima 7000DV, PE, USA).…”