English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The pharmaceutical, fine chemical, photography, and military industries have aggressively sought means of eliminating organic solvents from their cleaning operations because many organic cleaning solvents have been characterized as hazardous or toxic wastes. As a substitute, we previously found that 3% hydrogen peroxide (H 2 O 2 ) in water effectively removed tenacious residues from glass surfaces. Studies also showed that mild heating and a moderately high solution pH (8.5 to 9.5) enhanced cleaning. Possible mechanisms of such cleaning process were investigated herein by studying kinetic properties of the process via Accelerating Rate Calorimetry. The activation energy and on-set temperature of hydrogen peroxide decomposition decreased and rate constants increased as increasing solution pHs. The decomposition was first order, uncatalyzed reaction at initial pH 5.0, and a more rapid second order reaction at initial pH 8.5 in titanium bombs. The rate constant of the second order alkaline-induced decomposition was estimated as 0.019 M -1 s -1  at 30 °C in titanium bombs. The lowest rate constant was observed as 1 x 10 -8  s -1  at 30 °C and pH 5.0-7.0 using 3% H 2 O 2  . The presence of chromatographic silica gel did not exhibit a catalytic effect on the decomposition of H 2 O 2  in a manner that lowered the activation energy, although it did lower the reaction rate and increase the onset temperature to some extent. As much as 35 g/L silica gel was also found to almost completely depress the reactions. The actual asphalt cleaning process was also simulated inside the calorimeter bomb, but yielded no significant changes in kinetic properties.

journal of advanced oxidation technologies

Hydrogen Peroxide Cleaning of Asphalt from Surfaces The Accelerating Rate Calorimetry (ARC™) Study: The Effect of Silica Gel and Solution pH on Hydrogen Peroxide Decomposition