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In this work, the reaction between H 2 O 2 and tungsten powder in the presence of Tris(hydroxymethyl) aminomethane was studied experimentally. The production of hydroxyl radicals can be quantified indirectly by quantifying the scavenging product formaldehyde (CH 2 O). XRD, XPS, and SEM analysis shows that no significant structural or compositional changes occur after reaction. We compared H 2 O 2 consumption and CH 2 O formation in both heterogeneous W (s) /H 2 O 2 /Tris system and homogeneous W (aq) /H 2 O 2 /Tris system. Increasing the amount of W powder leads to the increase in dissolution rate of W species, insignificant increase of H 2 O 2 consumption rate and the decrease of final CH 2 O production. By contrast, the consumption rate of H 2 O 2 increases as increasing the concentration of dissolved W species. Based on the experimental results, a mechanism of H 2 O 2 reacting with W powder in the presence of Tris is proposed. The mechanism well explained the relationship between surface reactions and homogeneous Haber–Weiss peroxide chain breakdown.
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Yang et al. (2015) studied this question.
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