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Adsorption behavior of arsenicals on MIL-101(Fe): The role of arsenic chemical structures
Summary:
The authors from Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration in East China Normal University and School of Environmental Science and Engineering, Tongji University developed a MIL-101(Fe) material with high porosity and excellent adsorption capacity, achieving significant results in the application of arsenic removal.
Background:
1. To address the problem of arsenic contamination in water, previous researchers conducted work on various adsorbents such as manganese dioxide, activated carbon, and biochar, achieving certain success, yet there are problems like low adsorption capacity and selectivity.
2. The authors in this proposed an innovative method of using MIL-101(Fe), a type of highly porosity iron-based metal-organic frameworks, and obtained excellent adsorption capacities for different arsenic species.
Research Content:
1. Synthesis:
The authors synthesized the MIL-101(Fe) material using the solvothermal method.
2. Characterizations:
1) Results of BET show a specific surface area of 1172.5 m2 g-1 and pore volume of 1.16 cm3 g-1, with pore size distribution indicating the presence of macrospores, mesopores, and micropores.
2) SEM tests show the particle size of the material is about 2-3 µm.
3) XPS and FTIR tests confirm the formation of FeAOAAs coordination and the involvement of substituent aromatic units in the adsorption process.
3. Application:
The material was tested in the adsorption of arsenate (As(V)) and its organic forms such as roxarsone (ROX), p-arsanilic acid (p-ASA) and dimethyl arsenate (DMA), and the results show maximum adsorption capacities of 232.98, 507.97, 379.65 and 158.94 mg g-1, respectively.
4. Mechanism:
The analysis of the experiment results suggests that the FeAOAAs inner-sphere coordination is the primary adsorption mechanism. The substituent aromatic units in ROX and p-ASA strengthen the adsorption through hydrogen bonds and π-π stacking interaction, while the strong FeAOAAs coordination limits the reusability of MIL-101(Fe).
Outlook：
This research confirms the potential value of MIL-101(Fe) as a remarkable adsorbent to control aqueous arsenic contamination, emphasizing the significant role of arsenic speciation and the chemical structure of the adsorbent in the adsorption process.
Adsorption behavior of arsenicals on MIL-101(Fe): The role of arsenic chemical structures
Authors: Zongchen Li, Xuemin Liu, Wei Jin, Qingsong Hu, Yaping Zhao
DOI: 10.1016/j.jcis.2019.07.046
Link: https://www.sciencedirect.com/science/article/pii/S0021979719308252
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