Solvent and pH Dependences of Mixing Enthalpies of <i>N</i>-Glycylglycine with Protocatechuic Acid

Wang, Chunmei; Niu, Meiju; Liu, Min; Sun, Dezhi; Wang, Bingquan; Wang, Zhengping; Li, Dacheng; Liu, Guiqin; Han, Jun

doi:10.1021/acs.jced.5b00666

Cited by 2 publications

(1 citation statement)

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“…Protocatechuic acid was not detected for the assayed conditions at pH 10 in isolated solutions, which could be justified by its dissociation at higher pH values, as reported by Wang et al [33]. Also, among the studied four phenolic compounds, protocatechuic acid was the one that presented different trends in the mixture solution (Fig.…”

Section: Degradation Of Phenolic Acidssupporting

confidence: 56%

Degradation of phenolic acids by gamma radiation as model compounds of cork wastewaters

Madureira¹,

Barros

Melo³

et al. 2018

Chemical Engineering Journal

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• The radiolytic degradation of four phenolic compounds from cork wastewaters was studied under different pH and atmospheres.• The degradation of the compounds was more evident in isolated than in the mixture solutions.• In the quaternary mixture, it were achieved higher degradation rates under irradiation with N 2 O.• Some of the compounds are a degradation product of the others.• 2,3,4-Trihydroxybenzoic acid and methyl gallate were identified as radiolytic products of the phenolic acids. G R A P H I C A L A B S T R A C T A R T I C L E I N F O Keywords:Phenolic acids Gamma radiation Radiolytic degradation Cork wastewaters A B S T R A C TThe degradation by gamma radiation of four phenolic compounds (gallic acid, protocatechuic acid, vanillic acid and syringic acid) present in cork wastewaters was studied in several treatment conditions. The irradiations were performed under different pH (natural, 3, 7 and 10) and atmospheres (aerated, N 2 O and O 2 ) for isolated and aqueous mixture solutions of standard phenolic acids. The degradation of the compounds was higher in isolated than in the mixture solutions indicating a protective effect in the quaternary mixture solution. The saturation with N 2 O promoted the highest degradation rates for all phenolic acids in the mixture. However, at natural pH and in air it was achieved degradation efficiencies > 50% for gallic, vanillic and syringic acids in isolated and mixture solutions for a treatment dose of 20 kGy. It was verified that some of the compounds are a degradation product of the others, for example gallic acid was found to be a radiolytic product of syringic, vanillic and protocatechuic acids. Two different compounds were identified as radiolytic products of the studied phenolic acids, and their fragmentation pathways were proposed. The results highlighted that ionizing radiation could be used as clean technology for pollutants degradation using doses of 20 kGy.

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Section: Degradation Of Phenolic Acidssupporting

confidence: 56%