THE INHIBITION OF THE PHOTOCHEMICAL DECOMPOSITION OF HYDROGEN PEROXIDE SOLUTIONS. I¹

Abstract

Many substances are known that inhibit the decomposition of hydrogen peroxide solutions, and some, such as acetanilide, phenacetin, benzamide, succinimide, phthalimide, etc.,2 tannic acid and derivatives,8 benzoic acid, salicylic acid, phthalic acid, etc.,4 sulfanilic acid,6 benzene sulfonic acid,6 soap,7 cinchonidine,8 ^-acetylaminophenol9 and barbituric acid10 may be used in commercial solutions as preservatives. Some of these substances were patented as early as 1906, principally for their inhibitive effect on the thermal decomposition. That they might have a similar action on the light decomposition does not seem to have been recognized until 1913 when Henri and Wurmser11 presented a number of inorganic compounds that inhibited the light reaction, and in the following year Mathews and Curtis12 added a number of organic and inorganic compounds. Recently Kailan13 and Kornfeld14 have studied the action of sodium hydroxide and sulfuric acid on the photochemical decomposition, and the latter has advanced a mechanism based on activated hydrogen and hydroxide ions and oxygen atoms, whereby the photocatalytic decomposition might take place in agreement with the known experimentally determined facts, and by which the inhibition by sodium hydroxide and sulfuric acid might be explained. Miss Kornfeld's theory regarding the mechanism, however, does not explain why sodium chloride is a fairly good inhibitor whereas sodium sulfate hardly inhibits at all; or why a 0.000,025 N solution of mercuric chloride inhibits as strongly as a 0.05 N sulfuric acid solution; or why a 0.005 N benzoic acid solution inhibits more strongly than a 0.005 N hydrochloric acid solution, the latter surely yielding a much greater hydrogen-ion concentration.1 This is the first of two papers to be presented on the subject. 2 U.

The primary radical yield in water. A comparison of the photolysis and radiolysis of solutions of hydrogen peroxide

“…MECHANIsM.-The mechanism of the photolysis of H202 has been widely discussed.4~ 243 25 The predicted rate law summarized in eqn. (1) for the photolysis has been confirmed by several authors.2-4, 26 There are a few data, however, which do not fit this kinetic scheme. Dain and Schwarz 27 found a dependence of the rate on [H202]* and Allmand and Style2 found a maximum in the quantum yield in dilute solutions.…”

Literature on technological capability: past, present and future

“…Cluster 1: absorptive capacity (AC): In Figure 2, cluster 1 has to do with the theoretical base AC. The term AC first appears in the literature in 1923 (Anderson and Taylor, 1923), but it begins to appear more forcefully in the business and management field in the 1980s, more specifically in 1981 with the indexation of the study conducted by Abbott (1981). Different authors (Cohen and Levinthal, 1990;Zahra and George, 2002) have contributed to the subject.…”