Fabrication of agricultural waste supported UiO-66 nanoparticles with high utilization in phosphate removal from water
Fabrication of agricultural waste supported UiO-66 nanoparticles with high utilization in phosphate removal from water
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农业废物支持的 UiO-66 纳米粒子的制备在去除水中的磷酸盐方面具有高利用率
DOI：
10.1016/j.cej.2018.12.017
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发表时间：
2019-03
影响因子：
15.1
通讯作者：
Yang Luyang
中科院分区：
文献类型：
--
作者：
Qiu Hui;Ye Meichen;Zeng Qingqing;Li Wenlu;Fortner John;Liu Lele;Yang Luyang
利用废水中的农业废物衍生材料有效去除磷酸盐是防止富营养化和水华的有效且经济的方法。在这项工作中，我们提出了一种通过原位水热合成将水稳定金属有机骨架UiO-66纳米颗粒固定在改性麦秆中的新方法，并获得了新型UiO-66纳米复合材料。 SEM和BET分析表明，UiO-66均匀分散在改性麦秆的表面和内部孔隙中。 UiO-66浸渍在带正电的麦秆(St+@UiO-66)中后，活性位点的利用率显着提高，更有利于UiO-66的分散。在高离子强度下，杂化 St+@UiO-66 的饱和吸附容量比大体积材料高 2 倍以上。与商业阴离子交换剂D201相比，St+@UiO-66表现出优异的选择性和对磷酸盐的偏好。吸附过程高度依赖于 pH 值，吸附动力学数据与伪二阶模型非常吻合。 FTIR和XPS研究表明UiO-66表面的羟基被磷酸根离子取代，并通过建立Zr-O-P配位键形成内球络合。此外，通过定期再生和完全再生的结合，St+@UiO-66可以可持续地用于除磷。结果表明，St+@UiO-66 对磷酸盐具有更好的吸附作用，并且提高了活性位点的利用率，这意味着作为一种有前景的磷酸盐吸附剂具有巨大的潜力。
Efficient removal of phosphate by agricultural waste derived materials from wastewater is an effective and economic way to prevent eutrophication and water bloom. In this work, we proposed a novel method to immobilize a water stable metal organic framework UiO-66 nanoparticle within modified wheat straw through in-situ hydrothermal synthesis and obtained the new UiO-66 nanocomposites. As indicated by SEM and BET analyses, UiO-66 is uniformly dispersed on the surface and the inner pores of modified wheat straws. The utilization rate of active sites is significantly promoted after UiO-66 impregnation within positively charged wheat straw (St+@UiO-66) which is more beneficial for UiO-66 dispersion. The saturated adsorption capacity of hybrid St+@UiO-66 is shown to be more than 2 times greater than bulky one under high ionic strength. Compared to commercial anion exchanger D201, St+@UiO-66 exhibits excellent selectivity and preference toward phosphate. The adsorption process is highly pH-dependent and adsorption kinetics data fitted well with the pseudo-second-order model. FTIR and XPS study indicated that hydroxyl groups on the surface of UiO-66 were replaced by phosphate ions and the inner-sphere complexation was formed via establishing Zr–O–P coordination bonds. In addition, St+@UiO-66 could be sustainably employed for phosphate removal through the combination of periodic regeneration and complete regeneration. It is demonstrated that St+@UiO-66 has preferable adsorption of phosphate with improved utilization of active sites, implying great potential as a promising phosphate adsorbent.
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