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研究了常用美白剂——光甘草定的光降解过程.首先研究了光源种类对光甘草定光降解的影响,结果发现紫外线更容易使光甘草定发生降解.为了研究其光降解动力学,将不同初始浓度的光甘草定置于紫外线下照射.结果显示,它的光降解速率随着浓度的减小而增大,且降解过程符合一级反应动力学.研究发现光甘草定在甲醇中表现出最高的稳定性.为了干预光甘草定的光降解,过氧化氢、盐酸(氢氧化钠)、金属离子、聚合物、紫外吸收剂、表面活性剂、还原剂和络合剂等被加入到光甘草定的溶液中.结果证明某些紫外吸收剂和表面活性剂能够有效地保护光甘草定,而诸如过氧化氢、盐酸(氢氧化钠)和金属离子等则会加快光甘草定的光降解.这些研究结果将有利于光甘草定的处方设计,以及加速它作为一种环境污染物时的降解过程.
The photodegradation process of the common whitening agent-Guangcao Ding was studied.Firstly, the effects of different light sources on the photodegradation of Guangcao were studied, and it was found that it was easier for photoperiod to degrade by ultraviolet light.In order to study its photodegradation kinetics, The initial concentration of Glycyrrhiza uralensis was exposed to ultraviolet light and the results showed that its photodegradation rate increased with the decrease of concentration and the degradation process accorded with the first order reaction kinetics.The results showed that Guangli Cao was the highest in methanol In order to intervene in the photodegradation of mecodoferrin, hydrogen peroxide, hydrochloric acid (sodium hydroxide), metal ions, polymers, ultraviolet absorbers, surfactants, reducing agents and complexing agents and the like are added to light licorice The results show that some UV absorbers and surfactants can effectively protect the Guang Gancao Ding, and such as hydrogen peroxide, hydrochloric acid (sodium hydroxide) and metal ions, etc., will speed up the light of photoperiod melamine degradation. These findings will favor the prescription design of GLP and accelerate its degradation as an environmental pollutant.