Dataset for "New studies on the photodegradation of the herbicide Glyphosate"

The photodegradation of glyphosate (PMG) in aqueous solution by the action of UV-light and the catalytic effect of copper and copper-alga Ulva lactuca was studied. The photodegradation kinetic reaction of PMG can be described using a first-order kinetic model, with a mean rate constant of k = (0.04 ± 0.01) h-1 and a mean half-life () = (17 ± 4) h. The quantum yield () obtained for the photochemical decomposition of PMG was (4.8 ± 0.1) 10-4 mol Einstein-1, and the photodegradation by-products obtained were: acetate, aminomethylphosphonic acid (AMPA), phosphate, sarcosine and to a lesser extent nitrate. The photolytic process seems to be the main responsible for the herbicide degradation. The presence of copper in the reaction media increases 30 times the rate of PMG degradation, with respect to the photodegradation in the absence of the metal. The degradation efficiency of the ternary system PMG-Cu-alga is ≈ 8 times greater than the photolysis of PMG in aqueous solution, but is at least 4 times smaller than the degradation efficiency in the presence of Cu(II). The present work represents a new approach on the photodegradation of the herbicide glyphosate and the results obtained may contribute to the development of new remediation technologies. This data are the results obtained for the photodegradation of PMG本研究探讨了水溶液中草甘膦（glyphosate, PMG）在紫外光（UV-light）作用下的光降解行为，以及铜与铜-海莴苣（Ulva lactuca）的催化效应。PMG的光降解动力学过程可通过一级动力学模型（first-order kinetic model）进行拟合，其平均反应速率常数$k=(0.04±0.01) ext{h}^{-1}$，平均半衰期$( au)=(17±4) ext{h}$。本研究测得PMG光化学分解的量子产率（quantum yield）为$(4.8±0.1)×10^{-4} ext{mol·Einstein}^{-1}$，所得光降解副产物包括乙酸盐、氨甲基膦酸（aminomethylphosphonic acid, AMPA）、磷酸盐、肌氨酸，以及少量硝酸盐。研究表明，光解过程是该除草剂降解的主要途径。与无金属存在的光降解体系相比，反应介质中铜的存在可使PMG的降解速率提升30倍。三元体系PMG-铜-海莴苣的降解效率约为纯水溶液中PMG光解的8倍，但至少比Cu(II)存在时的降解效率低4倍。本工作为除草剂草甘膦的光降解研究提供了全新思路，所得结果可为新型修复技术（remediation technologies）的开发提供有益参考。本数据集即为PMG光降解的相关实验结果。