Ye Xuejun, Chen Daniel, Li Kuyen, Wang Bin, Hopper Jack
Department of Chemical Engineering, Lamar University, Beaumont, Texas 77710, USA.
Water Environ Res. 2007 Aug;79(8):851-7. doi: 10.2175/106143007x194338.
This study investigates the products, kinetics, and reactor design of atrazine photolysis under 254-nm ultraviolet-C (UVC) irradiation. With an initial atrazine concentration of 60 microg/L (60 ppbm), only two products remain in detectable levels. Up to 77% of decomposed atrazine becomes hydroxyatrazine, the major product. Both atrazine and hydroxyatrazine photodecompose following the first-order rate equation, but the hydroxyatrazine photodecomposition rate is significantly slower than that of atrazine. For atrazine photodecomposition, the rate constant is proportional to the square of UVC output, but inversely proportional to the reactor volume. For a photochemical reactor design, a series of equations are proposed to calculate the needed UVC output power, water treatment capacity, and atrazine outlet concentration.
本研究调查了在254纳米紫外线C（UVC）照射下阿特拉津光解的产物、动力学和反应器设计。初始阿特拉津浓度为60微克/升（60 ppb m）时，只有两种产物的浓度可被检测到。高达77%分解的阿特拉津变成了羟基阿特拉津，这是主要产物。阿特拉津和羟基阿特拉津均遵循一级速率方程进行光分解，但羟基阿特拉津的光分解速率明显慢于阿特拉津。对于阿特拉津的光分解，速率常数与UVC输出的平方成正比，但与反应器体积成反比。对于光化学反应器设计，提出了一系列方程来计算所需的UVC输出功率、水处理能力和阿特拉津出口浓度。
