螺旋霉素在水溶液中的光降解
Photodegradation of spiramycin in aqueous solution
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摘要: 螺旋霉素（Spiramycin，SPI）是一种广泛存在于水体中的新兴有机污染物.在表层水体，光降解是其主要的降解方式.本实验研究了高压汞灯（250W）、氙灯（1000W）和太阳光照射下SPI在超纯水和天然湖水中的光降解过程，探讨了SPI在水溶液中的光降解动力学及环境因素对其光降解的影响.结果表明，SPI在高压汞灯照射下降解最快，其次是氙灯，太阳光照射下降解最慢，均符合准一级反应动力学.高压汞灯照射下，SPI在纯水中的光降解速率小于天然湖水中，在纯水中SPI发生了直接光降解和自敏化光降解，并以直接光降解为主.SPI的光降解速率常数（k）与其初始浓度（C0）呈负相关；随水体pH增大k增大；NO3-对SPI光降解具有促进作用，NO3-浓度升高降解速率增大；而HA、NO2-对其光降解具有抑制作用，HA、NO2-浓度升高抑制率增加.Abstract: Spiramycin (SPI) is widely present in water environment as an emerging organic contaminant. In surface waters, photodegradation represents an important degradation pathway for SPI. The photodegradation of SPI was investigated in pure water and natural lake water exposed to high-pressure mercury lamp (250W), xenon lamp(1000W) and sunlight.The photodegradation kinetics of SPI and the effect of environmental factors on its photolysis in aqueous solution were investigated. According to the results, the degradation of SPI was observed at the fastest rate under high-pressure mercury lamp radiation, followed by xenon lamp and then natural sunlight according to the pseudo-first-order kinetics. The photolytic rate of SPI in pure water exposed to the high-pressure mercury lamp was lower than that in natural lake water. SPI experienced direct photolysis and self-sensitized photolysis in pure water, and direct photolysis rate was much greater than the rate of self-sensitized photolysis. The present results indicated that the photolytic rate constant (k) of SPI was negatively correlated with initial concentration(C0). With the increase of solution pH, the k increased. NO3- accelerated the photolysis,and the increased concentration of NO3- led to rise of the SPI photolysis rate. The presence of HA and NO2- inhibited the photolysis of SPI, and the inhibitory effects became more obvious with the rise of concentrations of HA and NO2.
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Key words:
- emerging organic contaminant /
- antibiotic /
- spiramycin(SPI) /
- photodegradation /
- influencing factors
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