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Photoactive Titania Float for Disinfection of Water; Evaluation of Cell Damage by Bioanalytical Techniques
Author(s) -
Shwetharani R.,
Jyothi M. S.,
Laveena P. D.,
Geetha Balakrishna R.
Publication year - 2014
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12277
Subject(s) - doping , anatase , x ray photoelectron spectroscopy , band gap , photocatalysis , materials science , analytical chemistry (journal) , nanotechnology , transmission electron microscopy , chemistry , chemical engineering , optoelectronics , environmental chemistry , catalysis , biochemistry , engineering
A photoactive float was fabricated with the modified titania to cause a feasible disinfection of water, contaminated with E. coli . The commercially available titania was doped with neodymium by pulverization technique to enhance its activity in sunlight and a multiapproach technique was used to evaluate the extended efficiency of the doped sample. X‐ray diffraction patterns depicted the retention of anatase phase on doping and the existence of neodymium was confirmed by the energy dispersive atomic X‐ray analysis and the X‐ray photoelectron spectroscopy. Transmission electron microscopy and Bruner–Emmett–Teller analysis depicted a marginal increase in the particle size and a decrease in the surface area, respectively. Doping induces semiconductor behavior with lower band energy that could respond to visible light and exhibit better disinfection activity. The “f” and “d” transitions of the lanthanide in doped sample caused new electronic behavior of trapping/detrapping effect together with bandgap narrowing. The amount of malondialdehyde, protein, DNA and RNA released on destruction of E. coli was observed to be 0.915 × 10 −3 μ g mL −1 , 859.912 μ g mL −1 , 20.173 μ g mL −1 and 1146.073 μ g mL −1 , respectively. The above analytical methods along with standard plate count method substantiated the enhanced disinfection efficiency of the doped sample in sunlight.