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首页> 外文期刊>Environmental Science & Technology >Copper-glyphosate sorption to microcrystalline gibbsite in the presence of soluble Keggin Al-13 polymers
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Copper-glyphosate sorption to microcrystalline gibbsite in the presence of soluble Keggin Al-13 polymers

机译：在可溶性Keggin Al-13聚合物存在下草甘膦铜吸附到微晶菱铁矿上

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Among the most reactive yet largely neglected adsorbents of toxicant species occurring in acidic aquatic environments are the is an element of-Keggin Al-13 polyoxocations [AlO4Al12(OH)(24)(H2O)(12)(7+)], known generally as Al-13 polymers. Here, we report on the sorption of Cu(II), a common ingredient of pesticides, and glyphosate {N-[phosphonomethyl]glycine (PMG)}, a widely applied herbicide, to microcrystalline gibbsite [gamma-Al-(OH)(3)] in the presence of soluble Al-13 polymers over the pH range 4-7. In the presence of gibbsite and soluble Al-13 polymers, dissolved Cu(II) decreased gradually with pH, achieving a minimum at pH 5.5. Between pH 5.5 and 6.0, however, soluble Cu increased markedly, with approximately 80% of the added metal remaining in solution at pH 5.86. At pH > 6.0, soluble Cu once again decreased, becoming undetectable at pH 7. The anomalous Cu solubilization was attributed to a concomitant deprotonation of soluble Al-13 polymers, yielding surface OH groups possessing high affinity for Cu(II). Removal of Cu from solution at pH > 6.0 is facilitated by flocculation of the Al-13 polymers to which Cu had sorbed. The sorption behavior of the zwitterionic PMG in the presence of gibbsite and Al-13 polymers was consistent with this interpretation, there being a dramatic increase in sorbed PMG at pH > 6.0 as the Al-13 polymers deprotonated and flocculated. Copper and PMG loss from solution with increasing pH when both adsorptives were added to the gibbsite-Al-13 polymer system was broadly similar to what was observed in the PMG-free systems, although small differences were detected in response to varying the order of adsorptive addition. The inclusion of soluble Al polymers in our experiments exposes a fundamental limitation of models based on but a single inorganic adsorbent as a means to predict the behavior of trace metals and xenobiotic organic compounds in natural systems.
机译：在酸性水生环境中发生的最有反应力但最被忽视的有毒物质吸附剂是-Keggin Al-13多氧合[AlO4Al12（OH）（24）（H2O）（12）（7+）]的元素。作为Al-13聚合物。在这里，我们报道了农药的常见成分Cu（II）和广泛应用的除草剂草甘膦{N- [膦酰基甲基]甘氨酸（PMG）}对微晶菱铁矿[γ-Al-（OH）（ 3）]在pH范围4-7的可溶性Al-13聚合物存在下。在三水铝石和可溶性Al-13聚合物存在下，溶解的Cu（II）随着pH值逐渐降低，在pH 5.5时达到最小值。然而，在pH 5.5和6.0之间，可溶性Cu显着增加，大约80％的添加金属保留在pH 5.86的溶液中。在pH> 6.0时，可溶性Cu再次降低，在pH 7时变得不可检测。异常的Cu增溶归因于可溶性Al-13聚合物的去质子化，产生了对Cu（II）具有高亲和力的表面羟基。通过絮凝吸附有Cu的Al-13聚合物，可以在pH值大于6.0的情况下从溶液中去除Cu。在三水铝石和Al-13聚合物存在下，两性离子PMG的吸附行为与该解释一致，随着Al-13聚合物去质子化和絮凝，在pH> 6.0时，吸附的PMG急剧增加。当将两种吸附剂都添加到三水铝铝13聚合物体系中时，随着pH值的增加，溶液中铜和PMG的损失与无PMG的体系中观察到的大致相似，尽管检测到吸附顺序的变化存在很小的差异。加成。在我们的实验中包含可溶性Al聚合物暴露了基于一个单一无机吸附剂作为模型预测自然系统中痕量金属和异源有机化合物行为的方法的基本限制。

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