Abstract:

We investigated the photoconversion laws of α-naphthol in laboratory simulation experiments in ice under UV irradiation, studied the impact factors, analyzed the photoproducts, and deduced reaction mechanisms. The results show that α-naphthol could be photoconverted under UV irradiation in ice, and the conversion rate increased with the decreasing of initial concentration of α-naphthol, and increased with the increasing of light intensity and ultrasonic time. The photoconversion rate of αnaphthol in natural Songhua River water was faster than that in distilled water. Strong acidic or basic conditions were beneficial to the photoconversion of αnaphthol. Added NO^-₃,NO^-₂,HCO^-₃,Fe²⁺,Fe³⁺, and Mn²⁺ all promoted the photoconversion of α-naphthol. Cl^- had no significant impact on the photoconversion of α-naphthol. Four photoproducts were determined by GC-MS in the photoconversion of α-naphthol, and the proposal photoconversion pathways of α-naphthol were condensation, oxidation and reduction reactions.

Key words: α-naphthol, photoconversion, ice