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首页> 外文期刊>Journal of environmental science and health >Photocatalytic mineralization of glyphosate in a small-scale plug flow simulation reactor by UV/TiO_2
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Photocatalytic mineralization of glyphosate in a small-scale plug flow simulation reactor by UV/TiO_2

机译：UV / TiO_2在小型活塞流模拟反应器中草甘膦的光催化矿化作用

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摘要

The present work involves the photocatalytic mineralization of glyphosate on a plug flow reactor by UV/TiO_2. The effect of catalyst loading shows an optimal value (0.4 g L~(-1)) which is necessary to mineralize glyphosate. The kinetic rate of glyphosate mineralization decreases with the increasing initial concentration of glyphosate, and the data can be described using the first-order model. An alkaline environment is conducive to glyphosate mineralization. The mineralization efficiency increases with elevated flow rate to 114 mL min~(-1), which is followed by a decrease with a further increase in flow rate due to the reduction of the residence time. The presence of external oxidants (K_2S_2O_8, H_2O_2 and KBrO_3) and photosencitizer (humic acid) can significantly enhance glyphosate mineralization. Photocatalysis oxidation ability of the three studied oxidants decrease in the order of: S_aO_8~(2-) > BrO_3~-> H_2O_2. Finally, the Langmuir-Hinshelwood (L-H) model was used to rationalize the mechanisms of reactions occurring on TiO_2 surfaces and L-H model constants were also determined.
机译：目前的工作涉及草甘膦在活塞流反应器上通过UV / TiO_2的光催化矿化作用。催化剂负载量的影响显示出最佳值（0.4 g L〜（-1）），这对于矿化草甘膦是必需的。草甘膦矿化的动力学速率随草甘膦初始浓度的增加而降低，并且可以使用一阶模型来描述数据。碱性环境有利于草甘膦的矿化。矿化效率随着流速增加至114 mL min〜（-1）而增加，随后由于停留时间的减少而降低，并随着流速的进一步增加而降低。外部氧化剂（K_2S_2O_8，H_2O_2和KBrO_3）和光敏剂（腐殖酸）的存在可以大大增强草甘膦的矿化作用。三种研究氧化剂的光催化氧化能力依次为：S_aO_8〜（2-）> BrO_3〜-> H_2O_2。最后，使用Langmuir-Hinshelwood（L-H）模型合理化了TiO_2表面上发生的反应的机理，并确定了L-H模型常数。

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