CexZr1 − xO2 mixed oxides applied to minimize the bromate formation in the catalytic ozonation of a filtered water

Several Ce_xZr_1 − xO₂ mixed oxides were prepared and used as catalysts to investigate the minimization of BrO₃⁻ formation in the ozonation of a filtered water containing Br⁻ in a batch reactor. The Ce_xZr_1 − xO₂ mixed oxides showed good performance in reducing BrO₃⁻ formation and removing organic compounds. The Ce_0.75Zr_0.25O₂ oxide exhibited the highest efficiency, and 53% BrO₃⁻ was reduced after 20 min reaction. The mixed oxides accelerated the decomposition of the dissolved O₃ into OH radicals, and the competitive reaction between organic compounds and Br⁻ with OH radicals was found to occur in the ozonation reaction.     

Design and synthesis of a novel d10–d10 mixed metal-based polymer with superior luminescent properties to select Ca2 + and Zn2 +

A novel luminescent probe based on Ag–Cu mixed metal coordination polymer has been designed and synthesized. Luminescent experiment indicates two peaks with maxima near 425 (Ag) and 660 nm (Cu), which shows high selectivity to Ca^2 + and Zn^2 +.     

A chromotropic acid modified SBA-15 as a highly sensitive fluorescent probe for determination of Fe<Superscript>3+</Superscript> and I<Superscript>−</Superscript> ions in water

A novel organic–inorganic hybrid nanomaterial (SBA-15-CA) was prepared by covalent immobilization of chromotropic acid onto the surface of mesoporous silica material SBA-15. Different techniques such as XRD, TEM, FT-IR, N₂ adsorption–desorption and TGA analyses were employed to characterize the grafting process. The data showed that the organic moiety (0.41 mmol g^?1) was successfully grafted to the SBA-15 and the primary hexagonally ordered mesoporous structure of SBA-15 was preserved after the grafting procedure. SBA-15-CA has been realized as a highly sensitive and selective fluorescent probe towards Fe³⁺ and I^? ions in aqueous media. SBA-15-CA exhibited a remarkable fluorescent quenching in the presence of Fe³⁺ ion over other competitive cations including Na⁺, Mg²⁺, Al³⁺, K⁺, Ca²⁺, Cr³⁺, Mn²⁺, Fe²⁺, Co²⁺, Ni²⁺, Cu²⁺, Zn²⁺, Cd²⁺, Hg²⁺, and Pb²⁺ as well as I^? ion among a series of anions including F^?, Cl^?, Br^?, CO₃^2?, HCO₃^?, CN^?, NO₃^?, NO₂^?, SCN^?, SO₄^2?, H₂PO₄^?, HPO₄^2?, and CH₃COO^?. A good linear response was observed between the concentration of the quenchers (Fe³⁺ and I^? ions) and fluorescence intensity of SBA-15-CA with detection limits of 1.5?×?10^?7 M for Fe³⁺ and 0.2?×?10^?7 M for I^?. Moreover, the effects of various pH values on the sensing ability of SBA-15-CA were investigated. Finally, the proposed method was successfully utilized for the determination of Fe³⁺ and I^? ions in river water, well water and tap water samples.     

Studies of dielectric relaxation and a.c. conductivity in [(100−<Emphasis Type="Italic">x</Emphasis>)PEO + <Emphasis Type="Italic">x</Emphasis>NH<Subscript>4</Subscript>SCN]: Al-Zn ferrite nano composite polymer electrolyte

Present work deals with findings on dielectric behaviour and a.c. conduction in a ferrite doped polymer nano composite electrolyte system, namely [(100−x) PEO + xNH₄SCN]: ferrite. The formation of nano composite and structural behavior of electrolyte was studied by XRD and SEM images. The effect of salt and ferrite on conductivity behaviour of PEO based nano composite polymer electrolyte has been investigated by the impedance spectroscopy at room temperature. The variation of dielectric permittivity and dielectric loss with frequency was carried out at ambient temperature. The a.c. conductivity seems to follow the universal power law.     

The redox pair {(μ4-TCNE)[Fe(CO)2(C5H5)]4}4+/3+: Surprisingly small metal–ligand interaction and the first resolved EPR hyperfine structure (13C, 14N, 57Fe) of a tetranuclear complex with TCNE−

Electrochemistry and absorption spectroscopy (UV/Vis, IR) of the complex {(μ₄-TCNE)[Fe(CO)₂(C₅H₅)]₄}(BF₄)₄ reveal only a small degree of metal-to-ligand π back donation, in contrast to previously characterized compounds [(TCNE)(ML_n)₄]. Accordingly, the one-electron reduced {(μ₄-TCNE)[Fe(CO)₂(C₅H₅)]₄}³⁺ exhibits a very well resolved EPR spectrum at g = 1.9965 with detectable coupling of 0.055 mT for ⁵⁷Fe in natural abundance from four coordinated [Fe(CO)₂(C₅H₅)]⁺ groups.     

Disproportionation,internal redox and comproportionation in the reaction of Hg22+ with WS42−: synthesis and structure of a novel mixed crystal, (PPh4)2[{Hg2(S)2}0.333(W2S6)0.666]

An equimolar mixture of (PPh₄)₂[Hg(CN)₂Cl₂] and metallic mercury reacts with WS₄²⁻ affording a yellow complex which on structural characterisation was found to be a solid state mixture (PPh₄)₂[{Hg₂(S₂)}_0.333(W₂S₆)_0.666].