The decolorization principle of hydrogen peroxide
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I would like to ask everyone why hydrogen peroxide can be used for decolorization, for example to decolorize phosphoric acid?
Hydrogen peroxide contains a peroxy bond, and this bond can easily break to generate peroxy radicals. These radicals have a strong ability to steal electrons, giving them high oxidizing properties. When strong oxidizing agents such as hydrogen peroxide react with pigments, the molecules of the colored substances are oxidized and thus lose their original color. When a strong oxidizer is used as a bleaching agent, the bleaching effect is permanent.
Relevant discussions and analyses are already available on this link. Attachment link: http://bbs.hcbbs.com/viewthread.php?tid=357701 (What is the oxidation mechanism of hydrogen peroxide?)
Can hydrogen peroxide remove the color from phenol-containing wastewater?
Sure, http://cache.baidu.com/c?m=9f65cb4a8c8507ed4fece76310418821480e97634b8b8753628cce0fd338081f5a35a3fd7c734e53c4c50b255bed5e5d9eab6065367551cfefbeee179be8cc3f2ffe46450a64864310d51bacc94423d565cd1abfa00e96cae741e3b9a4d0c82054dd22756df3879c5a7103ba6ae76230f4a7e95f655a07cb9927148f4e045e&p=99759a45d78815ea0be29e26490d&user=baidu Abstract: Study on the treatment of phenol-containing wastewater using an ultrasound-hydrogen peroxide-ferrous ion system -- Sichuan Environment, January 2004 -------------------------------------------------------------------------------- This source can be found on CNKI: www.cnki.net Experimental studies were conducted using an experimental setup to investigate the combined use of ultrasound, hydrogen peroxide, and ferrous ions in the treatment of phenol-containing wastewater. The effects of factors such as the initial pH value of the wastewater, the initial hydrogen peroxide concentration, ultrasonic power, and reaction time on the phenol removal rate were primarily investigated. The experimental results show that ultrasonic radiation can accelerate the oxidation process in the system consisting of hydrogen peroxide and ferrous ions, and this accelerating effect increases as the ultrasonic power rises. Under the experimental conditions, the best phenol removal efficiency was achieved when the initial pH value of the wastewater was 4–6.8 and the initial concentration of hydrogen peroxide was 140 mg/L. The degradation pattern of phenol during the treatment of phenol-containing wastewater using the ultrasonic-hydrogen peroxide-ferrous ion system follows an apparent first-order reaction.
What is the principle behind the decolorization of phosphoric acid? The colored appearance of the product indicates the presence of impurities; could it be a reaction between phosphoric acid and these impurities?