Synthesis of magnetic orderly mesoporous α-Fe2O3 nanocluster derived from MIL-100(Fe) for rapid and efficient arsenic(III,V) removal
Synthesis of magnetic orderly mesoporous α-Fe2O3 nanocluster derived from MIL-100(Fe) for rapid and efficient arsenic(III,V) removal
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DOI：
10.1016/j.jhazmat.2017.09.047
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发表时间：
2018-02-05
影响因子：
13.6
通讯作者：
Na, Ping
中科院分区：
文献类型：
--
作者：
Liu, Zhongmin;Chen, Jitao;Na, Ping
一种煅烧时间调节方法被前所未有地用于调节源自MIL-100(Fe)的新型α-Fe2O3纳米团簇的有序介观结构（MIL：拉瓦锡研究所的材料）。通过 XRD、SEM、TEM、TGA、N-2 吸附-脱附等温线、VSM、Zeta 电位、FTIR 和 XPS 对合成的磁性有序介孔 α-Fe2O3 纳米团簇进行了表征。煅烧6小时的α-Fe2O3纳米团簇表现出最佳的性能，包括高比表面积和有序的介孔性能，有利于砷（III，V）的吸附能力。 As(III)和As(V)的最大吸附容量分别为109.89和181.82 mg·g(-1)，并且在30 min内即可达到吸附平衡。动力学颗粒内扩散模型和吸附等温线表明吸附速率受孔扩散控制，吸附过程属于Langmuir单层吸附。这些结果表明，α-Fe2O3纳米团簇的有序介孔结构在砷（III，V）的快速有效吸附中发挥着关键作用。同时，吸附机理验证了砷可以通过Fe-O-As键与活性位点（Fe-OH）反应形成络合物。此外，α-Fe2O3纳米团簇由于其优异的磁性而易于分离。最重要的是，磁性有序介孔α-Fe2O3纳米团簇在实践中是一种很有前途的砷紧急处理吸附剂。 (C) 2017 Elsevier B.V. 保留所有权利。
A calcination time regulation method has been unprecedentedly used to adjust the orderly mesostructure of novel alpha-Fe2O3 nanoclusters derived from MIL-100(Fe) (MIL: Materials of Institute Lavoisier). The as-synthesized magnetic orderly mesoporous alpha-Fe2O3 nanoclusters were characterized by XRD, SEM, TEM, TGA, N-2 adsorption-desorption isotherms, VSM, Zeta potential, FTIR and XPS. The 6 h calcinated alpha-Fe2O3 nanocluster exhibited the optimal properties, including the high specific surface area and the orderly mesoporous properties, which facilitate the arsenic(III,V) adsorption capacity. The maximum adsorption capacities of As(III) and As(V) were 109.89 and 181.82 mg g(-1), respectively, and adsorption equilibrium can be reached just within 30 min. The kinetics intra-particle diffusion model and adsorption isotherms reveal that the adsorption rate is controlled by pore diffusion and the adsorption process belongs to Langmuir monolayer adsorption. These results indicate that the orderly mesoporous structure of alpha-Fe2O3 nanoclusters plays a key role in rapid and efficient adsorption for arsenic(III,V). Meanwhile, adsorption mechanism verifies that arsenic can react with active sites (Fe-OH) to form complexes by Fe-O-As bond. Moreover, alpha-Fe2O3 nanocluster can be separated easily due to its excellent magnetism. Above all, the magnetism orderly mesoporous alpha-Fe2O3 nanocluster is a promising adsorbent for emergent treatment of arsenic in practice. (C) 2017 Elsevier B.V. All rights reserved.