Tailoring electronic configurations in adsorptive sites for the enhancement of As(V) removal from groundwater
Tailoring electronic configurations in adsorptive sites for the enhancement of As(V) removal from groundwater
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调整吸附位点的电子配置以增强地下水中 As(V) 的去除
DOI：
10.2166/ws.2019.197
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发表时间：
2020-05
期刊：
影响因子：
1.7
通讯作者：
Jian Shen
中科院分区：
文献类型：
--
作者：
Kaixun Tian;Jing Xiao;He Zhao;Jian Shen
在过去的几十年中，重金属污染，如砷（V），已成为一个重要的问题，对水环境安全。由于实际可行性和成本效益的原因，随着吸附剂的快速发展，吸附已广泛用于水处理和回用领域。然而，精确控制吸附剂位点的电子构型以提高吸附性能在很大程度上是未开发的。在这项研究中，以证明电子构型对吸附性能的影响，我们合成了颗粒活性炭（GAC）负载的铁基氢氧化物吸附剂通过改变过渡金属的价态。此外，通过X射线光电子能谱（XPS），傅里叶变换红外光谱（FT-IR），和扫描电子显微镜（SEM），以确定表面结构和形态学特性的吸附剂。吸附性能研究表明，Fe（II）-GAC的吸附容量和除砷效率是Fe（III）-GAC的2倍，这是由于吸附剂与阳离子污染物（如Fe-O和As物种）之间的电荷转移所致。最后，选择PO 43-作为对照样品，以确认去除机理的合理性。总的来说，从电荷转移的电子构型的微调不仅有利于重金属去除通道，而且为吸附剂设计用于有机物去除提供基础信息。
In the past few decades, heavy metal pollution, such as As(V), has become an important issue for aqueous environment safety. For reasons of practical feasibility and cost-effectiveness, adsorption has been widely used in the water treatment and reuse community, with rapid development of adsorbents. However, the precise control of the electronic configuration of the adsorbents' sites to enhance adsorption performance is largely unexplored. In this study, to demonstrate the effect of electronic configuration on adsorption performance, we synthesized granular activated carbon (GAC) supported Fe-based hydroxides adsorbents by varying the valence state in transition metals. Furthermore, the adsorbents are characterized by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) to identify surface structure and morphological properties. Adsorptive performance studies show that the adsorption capacity and arsenic removal efficiency of Fe(II)-GAC are twice those of Fe(III)-GAC, as a matter of charge transfer between adsorbents and cationic pollution (such as Fe-O and As species). Finally, PO43− was selected as a control sample to confirm the rationality of the removal mechanism. Collectively, fine-tuning of the electronic configuration from charge transfer will not only benefit heavy metal removal channels, but also supply fundamental information for adsorbents design for organics removal.
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