Hydrogen peroxide decomposition promoted by

two granular activated carbons (GAC) of different characteristics (Hydraffin P110 and Chemviron SSP-4) has been studied in a batch reactor. The operating variables investigated were the stirring speed, temperature, pH and particle size. Also, the influence of metals on the GAC surface, that can catalyze hydrogen peroxide decomposition, was observed.

RESULTS: Chemviron SSP-4 showed a higher activity to decompose hydrogen peroxide than HydraffinP110 (70 and 50% of hydrogen peroxide removed after 2 h process, respectively). Regardless of the activated carbon used, hydrogen peroxide decomposition was clearly controlled by the mass transfer, although temperature AZ 628 concentration Torin 1 and pH conditions exerted a remarkable influence on the process. Catalytic ozonation in the presence of activated carbon and hydrogen peroxide greatly improved the mineralization of oxalic acid (a very recalcitrant target compound). About 70% TOC (total organic carbon) depletion was observed after 1 h reaction in this combined system, much higher than the mineralization achieved by the single

processes used.

CONCLUSIONS: Of the two activated carbons studied, Chemviron SSP-4 with an acidic nature presented a higher activity to decompose hydrogen peroxide. However the influence of the operating variables was quite similar in both cases. Experiments carried out in the presence of tert-butanol confirmed the appearance of radical species. A kinetic study indicated that the process was controlled by the internal mass transfer and the chemical reaction on the surface of the activated carbon. The catalytic activity

of hydrogen peroxide in oxalic acid ozonation promoted by activated carbon (O(3)/AC/H(2)O(2)) was also studied. The results revealed the synergetic activity of the system O(3)/AC/H(2)O(2) to remove oxalic acid. (C) 2010 Society of Chemical Industry”
“In this study, a series of novel imperatorin derivatives 7a-7e were designed and synthesized. Their vasorelaxation activities were evaluated by the pharmacological experiments in vitro. Most of the tested compounds exhibited better water Anlotinib solubility and vasorelaxation activity in different degrees, especially 7b and 7c with EC50 values of 2.29 and 2.63M, respectively on mesenteric artery, 7d and 7e with EC50 values of 1.04 and 2.65M, respectively on brain artery. The results indicated that these novel compounds have a potential interest for the development of novel and potent vasorelaxant agents for different kinds of arteries.”
“Objectives: Inflammation is critical in abdominal aortic aneurysm (AAA) but there is no current consensus on which inflammation related cytokines are important.