GO accelerate iron oxides formation and tetrabromobisphenol A removal enhancement in the GO loaded NZVI system
GO accelerate iron oxides formation and tetrabromobisphenol A removal enhancement in the GO loaded NZVI system
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GO 加速氧化铁的形成并增强负载 GO 的 NZVI 系统中四溴双酚 A 的去除
DOI：
10.1016/j.envpol.2022.120512
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发表时间：
2022-10-30
影响因子：
8.9
通讯作者：
Li, Hui
中科院分区：
文献类型：
--
作者：
Wang, Wenbing;Dong, Qianling;Li, Hui
四溴双酚A（TBBPA）是一种新兴的持久性有机污染物，很难用常规方法去除。本研究通过制备和优化GO负载纳米零价铁（NZVI/GO）来提高反应速率和TBBPA的去除效率。结果表明，GO负载显著降低了NZVI的自聚集，聚集体尺寸减小了50.00%（1400-700 nm）。同时，与NZVI（0.40 +/- 0.08 h（-1））体系相比，GO显著提高了NZVI/GO体系中TBBPA的反应速率kobs（1.11 +/- 0.11 h（-1）），并且当NZVI与GO的质量比达到1.0时，这种增加比其他质量比更显著（177.5%）。此外，X射线衍射和X射线光电子能谱分析表明，Fe 2+的转变被改变和富集的GO。在NZVI表面只检测到磁铁矿（Fe 3 O 4），而在NZVI/GO界面上检测到磁赤铁矿（γ-Fe 2 O3）、赤铁矿（α-Fe 2 O3）和Fe 3 O 4，它们通过TBBPA的-OH进一步进行络合吸附。这种特定的络合吸附是NZVI/GO系统中TBBPA和中间体的另一种潜在的加速去除机制。本研究为利用GO与NZVI的协同效应拓宽TBBPA去除的应用领域提供了新的视角。
Tetrabromobisphenol A (TBBPA) is an emerging persistent organic pollutant, which is very difficult to remove by common methods. In this study, the GO-load nanoscale zero-valent iron (NZVI/GO) was fabricated and opti-mized to improve the reaction rate and removal efficiency for TBBPA reliably and efficiently. The results showed that GO-load significantly reduced the self-aggregation of NZVI and the aggregate size decreased by 50.00% (1400-700 nm). Meanwhile, GO significantly improved the reaction rate kobs (1.11 +/- 0.11 h(-1)) of TBBPA in the NZVI/GO system compared to the NZVI (0.40 +/- 0.08 h(-1)) system, and this increment was more pronounced (177.5%) when the mass ratio of NZVI-to-GO reached 1.0 than other mass ratios. Furthermore, X-Ray Diffraction and X-ray photoelectron spectroscopy analysis suggested that the Fe2+ transformation was changed and enriched by the GO. Only magnetite (Fe3O4) was detected on the surface of NZVI, whereas the maghemite (gamma-Fe2O3), hematite (alpha-Fe2O3), and Fe3O4 were detected on the interface of NZVI/GO, which further performed the complexation adsorption through the -OH of TBBPA. This specific complexation adsorption is another potential accelerated removal mechanism for TBBPA and intermediates within the NZVI/GO system. This research has put forward a new perspective for widening the application of TBBPA removal using the synergistic effect between GO and NZVI.