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美國布魯克海文儀器公司>技術文章>Nanobrook Omni測量應用案例-22

技術文章

Nanobrook Omni測量應用案例-22

閱讀:322          發布時間:2018-6-21
 文獻名: Enhanced Adsorption of p-Arsanilic Acid from Water by Amine-Modified UiO-67 as Examined Using Extended X-ray Absorption Fine Structure, X-ray Photoelectron Spectroscopy, and Density Functional Theory Calculations

 

作者Chen Tian†§, Jian Zhao‡§ , Xinwen Ou, Jieting Wan, Yuepeng Cai, Zhang Lin*, Zhi Dang, and Baoshan Xing

School of Environment and Energy, Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters (Ministry of Education), Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, South China University of Technology, Guangzhou 510006, China

College of Environmental Science and Engineering, Key Laboratory of Marine Environmental Science and Ecology (Ministry of Education), Ocean University of China, Qingdao 266100, China

School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China

Stockbridge School of Agriculture, University of Massachusetts, Amherst, Massachusetts 01003, United States 

 

 

摘要:p-Arsanilic acid (p-ASA) is an emerging organoarsenic pollutant comprising both inorganic and organic moieties. For the efficient removal of p-ASA, adsorbents with high adsorption affinity are urgently needed. Herein, amine-modified UiO-67 (UiO-67-NH2) metalorganic frameworks (MOFs) were synthesized, and their adsorption affinities toward p-ASA were 2 times higher than that of the pristine UiO-67. Extended X-ray absorption fine structure (EXAFS), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculation results revealed adsorption through a combination of AsOZr coordination, hydrogen bonding, and π–π stacking, among which AsOZr coordination was the dominant force. Amine groups played a significant role in enhancing the adsorption affinity through strengthening the AsOZr coordination and π–π stacking, as well as forming new adsorption sites via hydrogen bonding. UiO-67-NH2s could remove p-ASA at low concentrations (<5 mg L1) in simulated natural and wastewaters to an arsenic level lower than that of the drinking water standard of World Health Organization (WHO) and the surface water standard of China, respectively. This work provided an emerging and promising method to increase the adsorption affinity of MOFs toward pollutants containing both organic and inorganic moieties, via modifying functional groups based on the pollutant structure to achieve synergistic adsorption effect.

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