Effect of synthesis parameters on the chromium content and catalytic activities of mesoporous Cr-MSU-x prepared under acidic conditions

Article Abstract:

Synthesis parameters, including different templates, initial Si/Cr molar ratios and temperature, have a detectable influence on the actual Cr content and structure property of mesoporous chromium-incorporated MSU-x molecular sieves that are prepared by nonionic poly-(ethylene oxide) surfactant templating under acidic conditions. Higher concentrations of chromium in the source gel solution and lower aging temperatures can increase the actual Cr content but reduce the short-range order of the Cr-MSU-x product .

Surface active agents, Surface Active Agent Manufacturing, Analysis, Porous materials, Catalysis

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Second harmonic generation (SHG) phase measurement of Cr(VI) at a buried interface

Article Abstract:

The process of second harmonic generation (SHG) phase measurement carried out on methyl ester-fictionalized fused quartz/water interfaces, which are the interfaces buried between two condensed-phase media, in presence or absence of Cr(VI), using an optical arrangement is presented. The phase difference of SHG signals generated at the interface in presence and absence of Cr(VI) is 85 degrees, which is consistent with SHG resonance enhancement observed for the surface-bound Cr(VI) near 290nm.

All Other Basic Organic Chemical Manufacturing, Esters, Salts & Halides NEC, Methods, Esters, Methyl groups, Harmonic analysis, Harmonic analysis (Mathematics), Methyl compounds

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Tracking oxytetracyline mobility across environmental interfaces by second harmonic generation

Article Abstract:

The binding behavior of the antibiotic oxytetracycline (OTC) to mineral oxide/water interfaces in the presence and absence of organic functional groups using the interface-specific technique second harmonic generation (SHG) is examined. Results reveal that OTC binding to fused quartz, methyl ester, carboxylic acid, and alkyl interfaces is fully reversible and highly dependent on solution pH, with appreciable adsorption occurring only at pH 8.

Science & research, Basic Chemical Manufacturing, Industrial Organic Chemicals, Organic Chemicals, Research, Organic compounds, Hydrogen-ion concentration, Oxytetracycline, pH

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