Rapid degradation of atrazine by hydroxyl radical induced from montmorillonite templated subnano-sized zero-valent copper
Rapid degradation of atrazine by hydroxyl radical induced from montmorillonite templated subnano-sized zero-valent copper
复制标题
蒙脱土模板化亚纳米零价铜诱导羟基自由基快速降解莠去津
DOI：
10.1016/j.chemosphere.2017.04.025
复制
发表时间：
2017
期刊：
影响因子：
8.8
通讯作者：
Gu Cheng
中科院分区：
文献类型：
--
作者：
Hong Ran;Guo Zupei;Gao Juan;Gu Cheng
以蒙脱石粘土矿物为模板剂，制备了亚纳米零价铜（ZVC）。蒙脱石表面电荷的离散分布有效地分离了形成的ZVC颗粒，抑制了它们的聚集。X-射线衍射结果表明，蒙脱土上的纳米ZVC颗粒尺寸为1.6 μ m，比常规方法制备的纳米ZVC颗粒小得多。以蒙脱土为模板的ZVC（ZVCMMT）对莠去津的降解表现出良好的上级活性，在几分钟内可降解90%以上的莠去津（15 μM）。结果还表明，降解过程是强烈依赖于合成ZVCMMT的水化状态。与新鲜制备的ZVCMMT相比，冷冻干燥的ZVCMMT表现出更高的反应性，这可以通过阿特拉津和氧残留在冷冻干燥的ZVCMMT表面上的更高吸附来解释。此外，ZVCMMT与阿特拉津反应后，阿特拉津的毒性显著降低，表明ZVCMMT可作为一种有前途的持久性有机污染物快速修复材料。
In this study, subnano-sized zero-valent copper (ZVC) was synthesized using montmorillonite clay mineral as the template. The discrete distribution of surface charge on montmorillonite effectively separates the formed ZVC particles and inhibits their aggregation. X-ray diffraction result indicates that the size of ZVC particles on montmorillonite is ∼6 Å, which is much smaller than nano-ZVC prepared by conventional method. The montmorillonite templated ZVC (ZVCMMT) shows superior reactivity as indicated by the degradation of atrazine, over 90% atrazine (15 μM) could be degraded in a few min. Hydroxyl radical is confirmed as the reactive species, which is produced from the activation of oxygen by ZVC. It was also shown that the degradation process is strongly dependent on the hydration status of synthesized ZVCMMT. The freeze dried ZVCMMT exhibits higher reactivity compared to freshly prepared ZVCMMT, which can be explained by the higher adsorption of atrazine and oxygen residue on freeze dried ZVCMMT surface. In addition, the toxicity of atrazine is significantly decreased after the reaction with ZVCMMT, indicating that ZVCMMT could be used as a promising material for rapid remediation of persistent organic contaminants.