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Emerging investigator series: 3D graphene anchored zerovalent Fe/Cu aerogel activating persulfate for efficiently 2,4 dichlorophenol degradation over a broad pH range
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2021-1-11 , DOI: 10.1039/d0ew01091j Kai Liu 1, 2, 3, 4, 5 , Mengran Li 5, 6, 7, 8 , Zhenlong Zhu 1, 2, 3, 4, 5 , Baolin Gao 1, 2, 3, 4, 5 , Haicen Zeng 1, 2, 3, 4, 5 , Yibing Ma 5, 9, 10, 11 , Liping Fang 1, 2, 3, 4, 5
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2021-1-11 , DOI: 10.1039/d0ew01091j Kai Liu 1, 2, 3, 4, 5 , Mengran Li 5, 6, 7, 8 , Zhenlong Zhu 1, 2, 3, 4, 5 , Baolin Gao 1, 2, 3, 4, 5 , Haicen Zeng 1, 2, 3, 4, 5 , Yibing Ma 5, 9, 10, 11 , Liping Fang 1, 2, 3, 4, 5
Affiliation
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Nanoscale zero-valent bimetals are receiving considerable attention because of their excellent capability to degrade organic pollutants in water; however, nanoparticle aggregation reduces their reactivity, and the difficult separation limits their general application. Herein, we have developed a novel graphene aerogel anchored nano zero-valent iron and copper (GA-Fe/Cu) composite for the removal of 2,4-dichlorophenol (DCP) through activation by persulfate (PS) under aerobic conditions. The results show that the GA-Fe/Cu aerogel exhibits outstanding performances in the DCP degradation by PS activation, which increase as the Fe/Cu loading increases from 3.1% [GA-Fe/Cu(3.1)] to 9.4% [GA-Fe/Cu(9.4)]. The GA-Fe/Cu(9.4) aerogel exhibits an optimal catalytic activity for DCP degradation (∼100%) by PS activation within 60 min (k1 = 0.0748 min−1). The degradation efficiency of DCP by GA-Fe/Cu(9.4) significantly increases with increasing PS concentration, and slightly decreases from 100% to 80% upon increasing the pH from 4.5 to 9.5. The SO4˙−, ˙OH, and ˙O2− radicals are found to be the dominant reactive oxygen species (ROS) generated by PS activation with GA-Fe/Cu(9.4), while non-radical mechanisms induced by GA appear to be also responsible for the DCP degradation. In addition, 83.2% of DCP is found to be completely mineralized by this reaction system. Thus, the findings of this work provide an alternative route for the efficient removal of organic pollutants from water.
中文翻译：
新兴研究者系列：3D石墨烯固定的零价Fe / Cu气凝胶活化过硫酸盐，可在较宽的pH范围内有效地降解2,4二氯苯酚
纳米级零价双金属由于其出色的降解水中有机污染物的能力而备受关注。然而，纳米粒子聚集降低了它们的反应性，并且难以分离限制了它们的一般应用。本文中，我们开发了一种新颖的石墨烯气凝胶锚固的纳米零价铁和铜（GA-Fe / Cu）复合材料，用于在有氧条件下通过过硫酸盐（PS）的活化来去除2,4-二氯苯酚（DCP）。结果表明，GA-Fe / Cu气凝胶在PS活化的DCP降解中表现出出色的性能，随着Fe / Cu含量从3.1％[GA-Fe / Cu（3.1）]增加到9.4％[GA- Fe / Cu（9.4）]。GA-Fe / Cu（9.4）气凝胶通过60分钟内的PS活化显示出DCP降解的最佳催化活性（〜100％）（k1 = 0.0748 min -1）。GA-Fe / Cu（9.4）对DCP的降解效率随着PS浓度的增加而显着增加，并且在pH从4.5升高到9.5时从100％降低到80％。的SO 4 ˙ -，OH，和O 2 -的基团被发现是由PS激活与GA-铁/铜（9.4）中产生的占主导地位的活性氧物质（ROS），而由GA诱导非自由基机制似乎还负责DCP降级。另外，发现83.2％的DCP被该反应系统完全矿化。因此，这项工作的发现为从水中有效去除有机污染物提供了另一种途径。
更新日期：2021-01-18
中文翻译：
新兴研究者系列：3D石墨烯固定的零价Fe / Cu气凝胶活化过硫酸盐，可在较宽的pH范围内有效地降解2,4二氯苯酚
纳米级零价双金属由于其出色的降解水中有机污染物的能力而备受关注。然而，纳米粒子聚集降低了它们的反应性，并且难以分离限制了它们的一般应用。本文中，我们开发了一种新颖的石墨烯气凝胶锚固的纳米零价铁和铜（GA-Fe / Cu）复合材料，用于在有氧条件下通过过硫酸盐（PS）的活化来去除2,4-二氯苯酚（DCP）。结果表明，GA-Fe / Cu气凝胶在PS活化的DCP降解中表现出出色的性能，随着Fe / Cu含量从3.1％[GA-Fe / Cu（3.1）]增加到9.4％[GA- Fe / Cu（9.4）]。GA-Fe / Cu（9.4）气凝胶通过60分钟内的PS活化显示出DCP降解的最佳催化活性（〜100％）（k1 = 0.0748 min -1）。GA-Fe / Cu（9.4）对DCP的降解效率随着PS浓度的增加而显着增加，并且在pH从4.5升高到9.5时从100％降低到80％。的SO 4 ˙ -，OH，和O 2 -的基团被发现是由PS激活与GA-铁/铜（9.4）中产生的占主导地位的活性氧物质（ROS），而由GA诱导非自由基机制似乎还负责DCP降级。另外，发现83.2％的DCP被该反应系统完全矿化。因此，这项工作的发现为从水中有效去除有机污染物提供了另一种途径。
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