Photochemical behaviour of humic acid synthesized from phenol

✍ Scribed by J.P. Aguer; C. Richard

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 411 KB
• Volume: 84
• Category: Article
• ISSN: 1010-6030
• DOI: 10.1016/1010-6030(94)03845-7

✦ Synopsis

A bumic-like material was synthesized by photo-oxidation of phenol at 253.7 nm, and its ability to photoproduce reactive species was compared with that of commercial bumic acids.

Irradiation at 253.7 nm of homogeneous solutions of bumic acids leads to the formation of eLq which are converted into bydroxyl radicals in aerated or oxygenated solutions. At this wavelength, synthetic and commercial bumic acids have similar behavioms. At ha300 nm, production of e, is not observed.

The formation of singlet oxygen was investigated over the range 365434 nm. It is shown that commercial bumic acids produce singlet oxygen whereas synthetic bumic acid does not. Thus the formation of singlet oxygen can be attributed to cbromophoric groups present in commercial bumic acids but not in the synthetic bumic acid.