Nanotechnology, Nanomaterials, Green Chemistry, Photocatalytic dye degradation
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Scopus Publications
Scopus Publications
Enhanced Photocatalytic Activity of Hydrothermally Synthesized Perovskite Strontium Titanate Nanocubes K. S. Kiran, R. Shashanka, S. V. Lokesh Topics in Catalysis, 2025 Strontium titanate (SrTiO 3 ) nanoparticles are one of the ideal and inexpensive perovskites used extensively as photocatalysts. In the present paper, Strontium titanate nanocubes (STNCs) were successfully fabricated by a hydrothermal technique using titanium dioxide and strontium nitrate (Sr(NO 3 ) 2 ) as precursors. The X-ray diffraction studies revealed the crystallinity of the fabricated STNCs and the diffraction pattern was well-matched with standard SrTiO 3 data. The scanning electron microscope, and transmission electron microscope confirmed the perovskite structure with a regular cubic phase and a refined particle sizes of ~ 18 nm. The energy dispersive spectrometer study showed that the mole ratio of Sr and Ti (Sr/Ti) are well-matched with the precursors used initially for the synthesis of STNCs. The synthesized STNCs showed excellent photocatalytic degradation of Methylene Blue (MB) and Tartrazine (TZ) dye under UV light irradiation with the kinetic study. Around 78.9 and 76.4% of degradation of MB and TZ dye was achieved successfully under UV light using fabricated STNCs with the respective rate of 3.713 × 10 –3 and 3.56 × 10 –3 min −1 . The reusability test for prepared STNCs was also conducted to estimate the efficiency of the catalyst.
Silver nanoparticles anchored TiO2 nanotubes prepared using saponin extract as heterogeneous and recyclable catalysts for reduction of dyes Chitrabanu C. Paramesh, Guddappa Halligudra, Murthy Muniyappa, Manjunath Shetty, Kiran K. Somashekharappa, Dinesh Rangappa, Kanchugarakoppal S. Rangappa, Prasanna D. Shivaramu Ceramics International, 2021 In the present study we made an effort to synthesize silver nanoparticle anchored onto TiO2 nanotubes using saponin extracted from Simarouba glauca oil seed meal. Obtained silver anchored TiO2 nanotubes (Ag-TiO2) were characterized using spectroscopic, microscopic and X‐ray diffraction techniques and used as catalysts for reduction of nitrophenol (NP), Methylene blue (MB), Methyl orange (MO) and Congo red (CR). The reduction reactions were carried out in aqueous medium in presence of NaBH4 at room temperature. Progress of the catalytic reaction was observed by decolorization of the dye solution and monitored by recording UV-Vis spectra. It was observed that Ag-TiO2 nanotubes emerged as an effective catalyst in reducing the dyes in the time range of 2 to 7 min with pseudo first-order kinetics and also effective in the simultaneous reduction of all dyes in 12 min. In addition, the catalyst showed a good recovery yield with unaffected catalytic efficiency up to ten cycles.
Hydrothermal Synthesis of K2Ti6O13Nanotubes/Nanoparticles: A Photodegradation Study on Methylene Blue and Rhodamine B Dyes Kiran Kenchappa Somashekharappa, Sampangi Venkatesh Lokesh ACS Omega, 2021 The degradation of methylene blue and rhodamine B dyes using potassium hexatitanate nanoparticles (KTNPs) and potassium hexatitanate nanotubes (KTNTs) synthesized via a hydrothermal method as efficient photocatalysts under UV light irradiation was investigated. The kinetics of degradation was determined for the two different catalysts––KTNPs and KTNTs––by monitoring the optical absorption of the dyes. The as-synthesized KTNPs were found to be spherical in shape with an average particle size of ∼36 ± 1.7 nm, whereas the KTNTs evidenced a tubular hollow structure with ∼7 nm internal diameter and ∼12 nm external diameter, as perused by structural and morphological studies. The larger surface area of KTNTs showed a greater impact on the photodegradation of dyes manifesting their high potential as compared to KTNPs under UV irradiation, and the reusability studies showed more than 90% (KTNTs) and 80% (KTNPs) degradation of the dyes even after the fourth cycle elucidating their stability.
Improved photocatalytic degradation of methyl orange dye in uv light irradiation by k2ti6o13 nanorods Kiran K S, Lokesh S V Journal of the Turkish Chemical Society Section A Chemistry, 2021 The K2Ti6O13 nanorods (KTNRs) were synthesized by Molten Salt Solution method (MSS) using TiO2 nanoparticles and potassium chloride as precursors. As synthesized KTNRs was characterized by powder X-ray diffraction to know the crystallinity, scanning electron microscopy confirms the rod type morphology with diameter 10 to 12 nm with length up to 80 nm, functional groups were studied with FT-IR spectroscopy, optical property of KTNRs showed the bandgap energy Eg= 3.41 eV by UV-Vis spectrophotometry. The synthesized KTNRs was used as photocatalyst for degradation of the methyl orange dye under UV light illumination. The degradation of methyl orange dye followed the pseudo first order rate law. The kinetics and mechanism of MO dye degradation dye was studied for different photocatalyst dosage 5, 10 and 15 mg of KTNRs, maximum for rate constant is found for 10 mg of photocatalyst.
Synthesis of SrTiO3nanotubes from green TiO2nanoparticles for enhanced photocatalytic activity K.S. Kiran, Ashwath Narayana, S.V. Lokesh Asian Journal of Chemistry, 2020 Asian Journal of Chemistry, a Multidisciplinary Chemistry Journal is an Peer Reviewed International Journal and publishes from India. The journal has been established since January 1989 on a firm foundation of International Quality Research. This Journal encompasses all branches of chemistry and its sub – disciplines like Pharmaceutical, Biological activities of Synthetic Drugs, Environmental Chemistry, Biochemistry, Polymer Chemistry, Petroleum Chemistry, and Agricultural Chemistry, etc.
