Insights into Antimony Adsorption on {001} TiO2: XAFS and DFT Study

Environmental Science & Technology
Li YanChuanyong Jing

Abstract

Antimony (Sb) contamination poses an emerging environmental risk, whereas its removal remains a contemporary challenge due to the lack of knowledge in its surface chemistry and efficient adsorbent. In this study, self-assembly {001} TiO2 was examined for its effectiveness in Sb removal, and the molecular level surface chemistry was studied with X-ray absorption spectroscopy and density functional theory calculations. The kinetics results show that Sb adsorption followed the pseudo-second order reaction, and the Langmuir adsorption capacity was 200 mg/g for Sb(III) and 156 mg/g for Sb(V). The PZC of TiO2, which was 6.6 prior to the adsorption experiment, shifted to 4.8 and <0 after adsorption of Sb(III) and Sb(V), respectively, indicating the formation of negatively charged inner-sphere complexes. EXAFS results suggest that Sb(III/V) adsorption exhibited a bidentate binuclear surface complex. The orbital hybridizing of complexes was studied by XANES, molecular orbital theory (MO), and density of states (DOS) calculations. The change in orbital energy derived from orbital hybridizing of adsorbed Sb on surfaces is the driving force underlining the Sb surface chemistry. New bonds between Sb and TiO2 surface were formed with matched...Continue Reading

References

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Dec 23, 2016·Journal of Environmental Sciences (China)·Li YanChuanyong Jing

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Citations

Jul 12, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jianyan WangGaosheng Zhang
Mar 11, 2020·Environmental Pollution·Li YanChuanyong Jing
Aug 24, 2019·Environmental Science & Technology·Jinming Luo, John C Crittenden
Apr 11, 2019·Environmental Science & Technology·Xiaochen LiChuanyong Jing
Jan 9, 2019·Environmental Science & Technology·Yanbiao LiuWolfgang Sand
Aug 14, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Eun-Suk JeongSang-Wook Han
Nov 5, 2021·Environmental Science. Processes & Impacts·Li Ye, Chuanyong Jing
Dec 23, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Shaoyu LuChuanyong Jing

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