摘要:
以太阳光和紫外光为光源,对1-丁酰基苯酚的两个异构体在液相中的光化学行为进行研究.结果表明:紫外光下,p-(1-丁酰基)苯酚、o-(1-丁酰基)苯酚在各种介质中的光解速率遵循一级动力学方程,p-(1-丁酰基)苯酚在各种溶剂中光解迅速,o-(1-丁酰基)苯酚在丙酮中的光解速率远大于其在甲醇、正己烷中的光解速率.在不同pH缓冲溶液中进行紫外光照2h,p-(1-丁酰基)苯酚在pH=7的缓冲溶液中光解最快,o-(1-丁酰基)苯酚紫外光照16.5h,在pH=9的缓冲溶液中光解最快.水中溶解物对p-(1-丁酰基)苯酚和o-(1-丁酰基)苯酚的光解均有一定的抑制作用.太阳光下,p-(1-丁酰基)苯酚在甲醇、正己烷中能稳定存在,光照40h浓度无变化.在丙酮中光降解显著,129.4mg·l-1p-(1-丁酰基)苯酚的丙酮溶液光照40h,光解率为46.2%;o-(1-丁酰基)苯酚的甲醇、正己烷溶液在太阳光下分别有轻微光解,而在丙酮中光解显著,138.8mg·l-1o-(1-丁酰基)苯酚的丙酮溶液光照40h,光解率为95.1%.
Abstract:
The photochemical behaviors of 1 butanoyl phenol by UV irradiation or sunlight in various solvents was examined.Under UV light,the photodegradation rate of p-(1 butanoyl)phenol or o-(1 butanoyl)phenol followed first order kinetics. p-(1 butanoyl)phenol decomposed rapidly in various solvents,and o-(1 butanoyl)phenol decomposed much faster in acetone than in methanol or n hexane. p-(1 butanoyl)phenol decomposed most quickly in pH 7 aqueous buffered samples under 2 hours UV irradiation,while o-(1 butanoyl)phenol decomposed most quickly in pH 9 aqueous buffered samples under 16.5 hours UV irradiation.The photodegradation of p-(1 butanoyl)phenol and o-(1 butanoyl)phenol also-depended upon the dissolved impurities.The presence of dissolved impurities slowed the rate of the photodegradation.Under sunlight, p-(1 butanoyl)phenol decomposed very slowly in n hexane or methanol,and relatively faster in acetone:46.3% of 129.4 mg·l-1 p-(1 butanoyl)phenol was decomposed by 40 hours irradiation; o-(1 butanoyl)phenol decomposed slightly in n hexane or methanol,and 95.1% of 138.8mg·l-1 o-(1 butanoyl)phenol in acetone was decomposed by 40 hours irradiation in sun light.
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