Photoconversion of Phenol in Ice with the Presence of Nitrate

Abstract

Abstract:

The photolysis of nitrate ion(NO₃^-) is widely studied in water. The formation of mutagens by photochemical reaction of aromatic compounds in aqueous solution was also observed and attributed to a photochemical nitration. While NO₃^- is one of the dominating anions found in ice samples in both polar regions, the photolysis of NO₃^- in ice is still an unknown field. Hence, the aim of this paper is to determine the kinetics and pathways of phenol photoconversion induced by NO-3 in ice. Using 125 W high-pressure mercury lamp as light source, under the condition of low temperature(-14—-12 ℃), the ice photoconversion reaction of phenol was studied when NO₃^- existed in ice. Each factor on phenol photoconversion in ice and phenol photoconversion dynamics were inspected. The results showed that initial concentration of phenol, initial concentration of NO₃^-, pH value and light strength all had greater influence on phenol photoconversion in ice. The photoconversion rate of phenol increases rapidly with the increasing of the initial concentration of NO₃^- and light intensity, and decreases with the increasing of the initial concentration of phenol. Under the strong acid or alkali were decreased the photoconversion rate of phenol. The photoconversion of phenol follows first-order kinetics equation. The photoproducts of phenol photolysis in ice were analyzed by GC-MS and LC-MS and on this basis the photoconversion mechanism of phenol was proposed.

Key words: Phenol, Photoconversion, Nitrate, Ice phase

CLC Number:

O644.11
X132

TrendMD:

KANG Chun-Li*, TANG Xiao-Jian, GUO Ping, GAO Hong-Jie, PENG Fei, LIU Xing-Juan. Photoconversion of Phenol in Ice with the Presence of Nitrate[J]. Chem. J. Chinese Universities, 2009, 30(4): 757.

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