期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 562, 期 -, 页码 342-351出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.11.115
关键词
Benzohydroxamic acid; Configuration; XPS; DFT; TOF-SIMS
资金
- National Natural Science Foundation of China (NSFC) [51804340]
- Innovation Driven Plan of Central South University [2018CX036]
- National Project 111 [B14034]
- National Key Scientific Research Project [2018YFC1901601, 2018YFC1901602]
- Collaborative Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources
Lead(II)-benzohydroxamic acid (Pb-BHA) complex collectors perform well with respect to scheelite flotation, and, due to their structure, they are widely used for industrial purposes. This paper examines the controversial issue of whether O, O five-membered ring or N, O four-membered ring complexes are formed when BHA coordinates with Pb ions, with their structure being comprehensively studied from the aspect of colloid and interface science. The configurations of Pb-BHA complexes are examined in a solution and on a mineral surface with experimental and computational methods. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) revealed that the five-membered ring is the dominant form of Pb-BHA complexes in a solution, whereas four-membered ring complexes are the stronger electron acceptor of the two. Moreover, XPS and time-of-flight secondary ion mass spectrometry (TOF-SIMS) confirmed that the four-membered ring complexes are stable with respect to being adsorbed on the scheelite surface. Therefore, although the four-membered ring is not as stable as the five-membered ring in a solution, it offers advantages with respect to adsorption on an electron-rich mineral surface during short-flotation processes. (C) 2019 Published by Elsevier Inc.
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