Synthesis of C,N,S-tridoped TiO2 distribute onto silicone for photocatalytic on degradation of tetracycline under visible light irradiation

Using carbon, nitrogen, and sulfur sourced from thiourea to co-doped TiO2 (C,N,S-TiO2), was prepared via hydrothermal method using precursors of titanyl sulfate TiOSO4, obtained by decomposition of ilmenite ore in Binh Dinh. The material used to make the substrate is glass and distributed onto it is silicone and photocatalytic. The structure and properties of materials system were investigated by modern physicochemical analysis methods including scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, diffuse reflection spectroscopy UV-Vis, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX) and nitrogen isothermal adsorption. The photocatalytic ability of materials system after being carried by silicone is demonstrated by decomposing tetracycline (10 mg/L) in aqueous solution with the yield more than 88% efficiency after 6 hours under visible light irradiation. The optimum dose of the photocatalyst was 0.6 g/L under visible light irradiation. The results indicated that C, N, S co-doped TiO2 demonstrated the highest photocatalytic efficiency and a perspective recyclable potential when it is distributed onto silicone.

Waste are purifying waste.

Cost-effective and eco-friendly methods of novel sorbentproductionbased on a Ti, Ca and Mg phosphates have been carried out. The solid precursors were ammonium titanyl sulfate and calcined dolomite, which were used as titanium, calcium, and magnesium sources. The heterogeneous synthesis procedure in-cludes stepwise interaction between solid precursors and liquid phosphorus-containing agents. In mech-anochemical way to obtain the sorbent was usedonly solid reactants. Synthesiswas carriedout in a plan-etary ball mill. The final product wasa composite material, whichconsistsof the following components: TiO(OH)H2PO4·H2O, Ti(HPO4)2·H2O, CaHPO4·2H2O, MgНPO4·3H2O, and NH4MgPO4·6H2O. The new sorbent shows high sorption ability towards radionuclides in multicomponent liquid radioactive waste (LRW) sys-tems. Purification effect is based on both precipitation and ion exchange mechanism.

Estimation of the Efficiency of Methods for Electroplating Wastewater Purification from Ammonium-Tartrate Copper (II) Complexes

Wastewater purification from heavy metal compounds is a complex and urgent task. One of the main sources of pollution of the environment with ions of heavy metals is the wastewater, i.e., washing, of the electro-plating processes. Complex electrolytes based on copper compounds are stable in a wide pH range and, when released into water, cannot be removed by the traditional methods, such as neutralization and precipitation. The study estimated the efficiency of various methods of physicochemical water purification for removing complex ammonia-tartrate copper (II) complexes from water. Findings of research show that titanyl sulfate is most effective in water purification using coagulants. The efficiency of purification with the use of titanium compounds reaches 85 %, which is on average 30--40 % higher than when using traditional coagulants based on aluminum or iron compounds. Electrocoagulation processes make it possible to effectively remove complex copper compounds from water due to a combination of the processes of organic component oxidation and coagulation with iron salts. It was found that advanced oxidation processes, which are based on the reaction with a hydroxyl radical, using hydrogen peroxide, i.e., Fenton processes, make it possible to purify wastewater from copper compounds by 99.9 %. Despite the high efficiency, it is advisable to use adsorption processes only at the stage of additional water purification from previously coagulated and oxidized pollutants

Three-dimensional morphology of anatase nanocrystals obtained from supercritical flow synthesis with industrial grade TiOSO4 precursor

Anatase TiO2 (a-TiO2) nanocrystals are vital in catalytic applications both as catalysts (e.g. photodegradation) and as a carrier material (e.g. NOx removal from exhaust). The synthesis of a-TiO2 nanocrystals and their properties have been heavily scrutinized, but there exists a clear gap between the scientific literature, and the scale and price expectation of industrial application. Here it is demonstrated that the industrially most attractive Ti precursor, titanyl sulfate (TiOSO4), can be combined with the green, scalable and fast supercritical flow method to produce phase pure and highly crystalline a-TiO2 nanoparticles with high specific surface area. Control of the nanocrystal morphology is important since it is known that certain facets substantially promote catalytic activity. It is, however, in itself challenging to determine nanocrystal morphology to provide a rational basis for the synthesis control. Here we advocate the use of advanced Rietveld refinement of powder X-ray diffraction data including anisotropic size broadening models in aiding to establish the sample three-dimensional morphology. This relatively quick and robust method assists in overcoming the often encountered ambiguity inherent in two-dimensional to three-dimensional reconstruction of selected particle morphologies with transmission electron microscopy and tomography techniques.

Titanite Ores of the Khibiny Apatite-Nepheline-Deposits: Selective Mining, Processing and Application for Titanosilicate Synthesis

Geological setting and mineral composition of (apatite)-nepheline-titanite ore from the Khibiny massif enable selective mining of titanite ore, and its processing with sulfuric-acid method, without preliminary concentration in flotation cells. In this process flow diagram, titanite losses are reduced by an order of magnitude in comparison with a conventional flotation technology. Further, dissolution of titanite in concentrated sulfuric acid produces titanyl sulfate, which, in turn, is a precursor for titanosilicate synthesis. In particular, synthetic analogues of the ivanyukite group minerals, SIV, was synthesized with hydrothermal method from the composition based on titanyl-sulfate, and assayed as a selective cation-exchanger for Cs and Sr.