Magnesium Salicylate

In-situ S-doped mesoporous carbons (ACS) were fabricated through template method by using sucrose as carbon source and basic magnesium sulfate whisker (513 MOS) as both sulfur source and template.ACS were highly efficient for the activation of peroxydisulfate (PDS) towards aqueous oxytetracycline (OTC) removal.Investigation on the effects of 513 MOS/ sucrose mass ratio on the physicochem. properties and catalytic performance indicated that higher sp. surface area, pore volume, thiophene-S (C-S-C) group content as well as carbon skeleton defects contributed to the excellent activity of ACS. 100% of OTC removal was achieved by ACS-2 within 30 min under the optimal reaction condition, which outperformed most reported transition-metal based and carbon-based heterogeneous catalysts.ACS-2 also showed excellent adaptability with wide pH range as well as various pollutants.Mechanism studies showed that PDS were activated through radical and non-radical pathways, and four plausible degradation pathways of OTC were proposed according to the intermediates identification.This work provides a straightforward method for the construction of metal-free sulfur-doped activated carbons with highly activity for the removal of refractory organic pollutants.

This study presents the synthesis of new spirocyclic boron-coordinated fluorophores based on a simple and facile procedure and their optical properties.The structure of the complexes was confirmed by ¹H, ¹³C, ¹¹B NMR spectra, high resolution mass spectra and single crystal X-ray diffraction data.The effect of the substituents in the terminal aromatic cycles and the spirocycle size on the photophys. properties was investigated by a combined exptl. and computational approach.The absorption and fluorescence emission properties of the SBCs were investigated and the results obtained revealed evident relationships between the electronic nature of the substituents and their photophys. properties.These differences clearly divide the spirocomplexes into two groups with significant differences in absorption and emission properties.SBCs with an electron acceptor substituent in cycle A and an electron donor substituent in cycle B have an emission maximum in the shorter wavelength region (416-451 nm) and a quantum yield of 2.3-12.5 %.In another group of compounds with the opposite set of substituents in cycles A and B, the emission maximum is located at 469-560 nm, the quantum yield is much lower (0.1-0.4 %), but the Stokes shift (8114-8160 cm^-1) increases significantly.These differences were explained using state-of-the-art quantum chem. calculations, which show that SBCs differ in the values of the electronic charges transferred in ESs and their localisation, and have different conjugated systems.