Journal
CATALYSTS
Volume 12, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/catal12111390
Keywords
Fenton; parabens; methylisothiazolinone; complexing agents; humic-like substances; preservative mix; cosmetics industry
Categories
Funding
- Spanish Ministerio de Ciencia, Innovacion y Universidad [RTI 2018-097997-B-C31]
- Generalitat Valenciana [AICO/2021/014]
Ask authors/readers for more resources
The degradation of various preservatives in the cosmetics industry was investigated using a mild photo-Fenton process. The presence of iron chelators improved the degradation process, but the complexing effect of humic-like substances was found to be ineffective in the case of methylisothiazolinone (MIT). The inhibitory effect of MIT on the degradation of parabens was observed, suggesting the formation of a complex between iron and MIT. The findings highlight the importance of using mixtures of model contaminants in future studies to understand the behavior of the whole system.
The degradation of various preservatives used in the cosmetics industry, including five parabens and their most employed substitute, methylisothiazolinone (MIT), was investigated. A mild photo-Fenton process was applied using low iron concentrations (5 mg/L) at a pH of five, instead of the traditional acidic value of three. At these conditions, the paraben degradation was very low after one hour of reaction and it was necessary to present humic-like substances (HLS) acting as iron chelators to improve the process. Values obtained when MIT was treated were very low, also in the presence of HLS, indicating that their complexing effect was not acting properly. When MIT was added to the mixture of parabens an inhibitory effect was found in the presence of HLS. A possible complex between iron and MIT was suggested and the studies of hydrogen peroxide consumption and Job's plot technique confirmed this hypothesis. Evidence of the formation of this inactive complex, so far never reported, will be essential in future work when dealing with this compound using Fenton processes. Furthermore, this fact points out the importance of using mixtures of model contaminants instead of a single one or a group of the same family, since their ability to form active or inactive complexes with iron can strongly change the behavior of the whole system.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available