Two stable thiazolylazo anion radical complexes of ruthenium(II), [Ru(L1 •-)(Cl)(CO)(PPh 3 ) 2 ] (1) and [Ru(L2 •-)(Cl)(CO)(PPh 3 ) 2 ](2) (where L1 = 2 0 -Thiazolylazo-2-imidazole and L2 = 4-(2 0 -Thiazolylazo)-1-n-hexadecyloxy-naphthalene), have been synthesized and characterized by spectroscopic and electrochemical techniques. The radical nature of the complexes has been confirmed from their room temperature magnetic moments and X-band ESR spectra. The radical complexes display a moderately intense (e * 10 4 M -1 cm -1 ) and relatively broad band in 430-460 nm region. In the microcrystalline state, complexes (1) and (2) display strong ESR signals at g = 1.951 and g = 1.988, respectively. In CH 2 Cl 2 solution, complexes (1) and (2) show a quasireversible one-electron response near -0.64 and -0.59 V, respectively, versus Ag/AgCl
The current research describes the synthesis, characterization, and application of CoFe 2 O 4 /g-C 3 N 4 /Bentonite as a novel nanocomposite for the e cient degradation of aniline blue under solar irradiation. Powder XRD, TIR, SEM, TEM, VSM, and UV-DRS were used to describe the formation and morphology of the composite. The composite has been used as a heterogeneous photo catalyst to degrade aniline blue in the presence of H 2 O 2 . In the presence of H 2 O 2 in solar radiation, it was possible to degrade 88.5 % of 10 ppm aniline blue solution just in 50 minutes using 50 mg of the composite. The improvement in photodegradation rate in the existence of H 2 O 2 was attributed to the advanced oxidation process (AOP) mechanism of Photo Fenton involving the production of reactive hydroxyl and perhydroxyl radicals. The degradation was found to follow 1st order kinetics with high regression coe cient with elevated rate constant.
This work presents completely a new, green, and non‐expensive route of synthesis of zinc oxide (ZnO) nanoparticles (NPs) using purple tea leaves. The crystalline nature of purple tea‐mediated ZnO NPs (PT‐ZnO NPs) was confirmed by XRD and SAED analyses. Further characterizations of PT‐ZnO NPs were done using UV‐vis spectroscopy, FTIR spectroscopy, SEM‐EDX, and TEM. The size of synthesized NPs was calculated to be 15.1 nm which presented spherical morphology with some sorts of agglomeration. The PT‐ZnO NPs when applied as visible light‐driven photocatalyst for degradation of dyes, Malachite green (MG) and Rhodamine B (RB) showed that degradation was found to be higher in their binary solution (MG‐RB) than in their single solution (MG/RB). MG 95% and RB 35% was degraded in their binary solution where as in their respective single dye solution MG 89% and RB 22% got degraded within the experimental time. The highly pure, PT‐ZnO NPs are considered to have comparable photocatalytic activity with respect to most of the reported works and hence might find a way for its practical application for waste water treatment in the real world. The PT‐ZnO NPs could be reused at least for five times without any significant loss in degradation efficiency.
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