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Solar photocatalytic detoxification of cyanide by different forms of TiO_2
Chockalingam Karunakaran,Paramasivan Gomathisankar,Govindasamy Manikandan 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.5
The photocatalytic efficiencies of TiO_2 nanocrystals of different modifications (anatase, rutile, P25 Degussa,Hombikat), to oxidize cyanide ion and subsequently the cyanate also, under natural sunlight at 950±25W m^−2 in alkaline solution have been compared. The oxides have been characterized by powder XRD, UV-visible diffuse reflectance and impedance spectroscopies. Under identical solar irradiance, the reaction follows Langmuir-Hinshelwood kinetics on cyanide, and depends on the apparent area of the catalyst bed and dissolved oxygen. However, the adsorption of cyanide on TiO_2 in dark is too small to be measured analytically. The photocatalytic activity of TiO_2 is not solely governed by the band gap or charge-transfer resistance or capacitance or phase composition but is in accordance with the specific surface area or the average crystallite size; rutile is an exception.
Efficient Photocatalytic Degradation of Salicylic Acid by Bactericidal ZnO
Karunakaran, Chockalingam,Naufal, Binu,Gomathisankar, Paramasivan Korean Chemical Society 2012 대한화학회지 Vol.56 No.1
Salicylic acid degrades at different rates under UV-A light on $TiO_2$, ZnO, CuO, $Fe_2O_3$, $Fe_3O_4$ and $ZrO_2$ nanocrystals and all the oxides exhibit sustainable photocatalysis. While ZnO-photocatalysis displays Langmuir-Hinshelwood kinetics the others follow first order on [salicylic acid]. The degradation on all the oxides enhance with illumination intensity. Dissolved oxygen is essential for the photodegradation. ZnO is the most efficient photocatalyst to degrade salicylic acid. Besides serving as the effective photocatalyst to degrade salicylic acid it also acts as a bactericide and inactivates E.coli even in absence of direct light.
Karunakaran Chockalingam,Singh I. Jeba,Vinayagamoorthy Pazhamalai 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.2
Cubic Ag2O-deposited anatase TiO2 nanospheres with cubic Ni0.5Zn0.5Fe2O4-core have been obtained by a 2-stage synthesis. They have been characterized by energy-dispersive X-ray spectroscopy, high-resolution scanning and transmission electron microscopies, X-ray and selected area electron diffractometries, vibrating sample magnetometry, nitrogen adsorption and desorption, and UV–visible diffuse reflectance and photoluminescence spectroscopies. The synthesized samples are superparamagnetic and absorb UV-A light and visible light in the entire wavelength range. Structure directing agent polyvinylpyrrolidone provides little influence on the Ag2O-capping process. The synthesized Ni0.5Zn0.5Fe2O4-core/Ag2O-capped TiO2-shell nanospheres are whole visible light-active magnetically recoverable photocatalyst; capped Ag2O sensitizes anatase TiO2 under whole visible light and the ferrite core buried in TiO2 lattice enables magnetic recovery of the photocatalytic nanospheres.