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Pan C, Niu M, Cui R, Li L, You X, Sun X, Ji C, Epstein IR, Gao Q. Mesoscopic Pitting Oscillation-Induced Periodic Anodic Layer Electrodissolution of Au(111). J Phys Chem Lett 2021; 12:12062-12066. [PMID: 34908416 DOI: 10.1021/acs.jpclett.1c03300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The electrodissolution of Au(111) in anaerobic cupric/ammonia/thiosulfate solutions, typical of a non-equilibrium dissipative system, was investigated via in situ electrochemical atomic force microscopy. At a specific initial concentration ratio of aqueous ammonia to cupric ions, the pit number and average pit area increase autocatalytically, while the pit depth increases monotonically during dissolution. A further increase in this initial concentration ratio leads to oscillatory dynamics in the pit number and average pit area while the pit depth fluctuates between one and two atoms. Mechanistic analysis indicates that alternation between formation and dissolution of a sulfur film results in periodic pitting, which produces gold dissolution layer by layer. This work presents a new dissolution mode, i.e., periodic layer dissolution generated by oscillatory pitting processes in addition to a pitting mode with a continually increasing depth, and the use of high initial concentration ratios of ammonia to cupric ion to accelerate the elimination of passivating sulfur film for Au dissolution.
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Affiliation(s)
- Changwei Pan
- Department of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China
| | - Mingshuang Niu
- Department of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China
| | - Ruijun Cui
- Department of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China
| | - Lianqun Li
- Department of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China
| | - Xinyu You
- Department of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China
| | - Xiao Sun
- Department of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China
| | - Chen Ji
- Department of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China
| | - Irving R Epstein
- Department of Chemistry and Volen Center for Complex Systems, Brandeis University, Waltham, Massachusetts 02454-9110, United States
| | - Qingyu Gao
- Department of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China
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Zhang Y, Xu B, Cui M, Li Q, Liu X, Jiang T, Lyu X. Thiosulfate leaching of gold catalyzed by hexaamminecobalt(III): Electrochemical behavior and mechanisms. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.139393] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zhang Y, Zi F, Hu X, Chen Z, Yang P, Chen Y, Qin X, Chen S, He P, Lin Y, Zhao L. Mechanism of pyrite oxidation in copper(II)-ethylenediamine-thiosulphate gold leaching system. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Zhang C, Wang Q, Nie Y, Han Z, Su Y. The copper ion reduction and oxidation cycle during the cathodic process of gold thiosulfate leaching. ASIA-PAC J CHEM ENG 2021. [DOI: 10.1002/apj.2568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Canyu Zhang
- College of Chemistry and Chemical Engineering Henan Polytechnic University Jiaozuo China
| | - Qiang Wang
- College of Chemistry and Chemical Engineering Henan Polytechnic University Jiaozuo China
| | - Yanhe Nie
- College of Chemistry and Chemical Engineering Henan Polytechnic University Jiaozuo China
| | - Zhiguo Han
- College of Chemistry and Chemical Engineering Henan Polytechnic University Jiaozuo China
| | - Yifan Su
- College of Chemistry and Chemical Engineering Henan Polytechnic University Jiaozuo China
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Nie Y, Yang L, Wang Q, Shi C, Zhu X, Chen J. Micromechanism Study of Strengthening Effect of Copper on Gold Thiosulfate Leaching. ACS OMEGA 2020; 5:31801-31809. [PMID: 33344834 PMCID: PMC7745436 DOI: 10.1021/acsomega.0c04544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 11/26/2020] [Indexed: 06/12/2023]
Abstract
To study the effect of copper on gold thiosulfate leaching, the gold dissolution of three different sample powders (gold, gold/copper, and gold/copper oxide) in a solution of 5 mM Cu2+, 0.4 M ammonia, and 0.1 M thiosulfate was studied. Scanning electron microscopy analysis showed no sulfur passivation on the gold surface, and there were more prominent corrosion pits on the gold surfaces of samples that were ground with copper or copper oxide. The Evans diagrams showed that copper and copper oxide can promote both the anode and cathode processes of gold dissolution. Based on first principle simulations, copper and copper oxide exhibited the ability to disrupt the stability of gold surface atoms and cause different degrees of relaxation. Both copper and copper oxide reduce the d-band center of the gold surface atoms and the adsorption between gold and thiosulfate. In addition, the bond length of the S-S bond of thiosulfate adsorbed onto the gold surface was longer when copper or copper oxide were not present. According to the change in the potential surface energy, the energy barriers for gold atom dissolution from gold, gold/copper, and gold/copper oxide surfaces were 1.79, 0.72, and 1.01 eV, respectively.
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Affiliation(s)
- Yanhe Nie
- College
of Chemistry and Chemical Engineering, Henan
Polytechnic University, Jiaozuo 454003, China
- Provincial
and Ministerial Collaborative Innovation Center for Safe Production
and Clean and Efficient Utilization of Coal, Jiaozuo 454003, China
| | - Lei Yang
- College
of Chemistry and Chemical Engineering, Henan
Polytechnic University, Jiaozuo 454003, China
| | - Qiang Wang
- College
of Chemistry and Chemical Engineering, Henan
Polytechnic University, Jiaozuo 454003, China
- Provincial
and Ministerial Collaborative Innovation Center for Safe Production
and Clean and Efficient Utilization of Coal, Jiaozuo 454003, China
| | - Changliang Shi
- College
of Chemistry and Chemical Engineering, Henan
Polytechnic University, Jiaozuo 454003, China
- Provincial
and Ministerial Collaborative Innovation Center for Safe Production
and Clean and Efficient Utilization of Coal, Jiaozuo 454003, China
| | - Xiaobo Zhu
- College
of Chemistry and Chemical Engineering, Henan
Polytechnic University, Jiaozuo 454003, China
- Provincial
and Ministerial Collaborative Innovation Center for Safe Production
and Clean and Efficient Utilization of Coal, Jiaozuo 454003, China
| | - Jianghao Chen
- College
of Chemistry and Chemical Engineering, Henan
Polytechnic University, Jiaozuo 454003, China
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Nie Y, Yang L, Wang Q, Shi C, Zi F, Yu H. Connection between gold dissolution in thiosulfate leaching and Cu(II) complexes during the cathodic process. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.135079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Barlow BC, Guo B, Situm A, Grosvenor AP, Burgess IJ. Shell isolated nanoparticle enhanced Raman spectroscopy (SHINERS) studies of steel surface corrosion. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113559] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Functional ZnS:Mn(II) quantum dot modified with L-cysteine and 6-mercaptonicotinic acid as a fluorometric probe for copper(II). Mikrochim Acta 2018; 185:420. [DOI: 10.1007/s00604-018-2952-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Accepted: 08/03/2018] [Indexed: 12/16/2022]
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Preparation of magnetic ferrite by optimizing the synthetic pH and its application for the removal of Cd(II) from Cd-NH3-H2O system. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.05.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Chen X, Lu Q, Liu D, Wu C, Liu M, Li H, Zhang Y, Yao S. Highly sensitive and selective determination of copper(II) based on a dual catalytic effect and by using silicon nanoparticles as a fluorescent probe. Mikrochim Acta 2018; 185:188. [DOI: 10.1007/s00604-018-2720-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 01/31/2018] [Indexed: 01/18/2023]
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Sugimura F, Sakai N, Nakamura T, Nakamura M, Ikeda K, Sakai T, Hoshi N. In situ observation of Pt oxides on the low index planes of Pt using surface enhanced Raman spectroscopy. Phys Chem Chem Phys 2018; 19:27570-27579. [PMID: 28980691 DOI: 10.1039/c7cp04277a] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In situ vibrational spectra of Pt oxides that cannot be measured with IR spectroscopy have been studied on the low index planes of Pt using surface enhanced Raman spectroscopy with bare Au nanoparticles (NPSERS). Two bands appear around 570 and 340 cm-1 at higher potentials in 0.1 M HClO4 saturated with Ar, which are assigned to the stretching vibration of Pt-O(H) and the libration vibration of Pt-O, respectively. NPSERS spectra are measured in O2 saturated solution for the first time. The band intensities of Pt-O(H) and Pt-O in O2 saturated solution are enhanced significantly compared with those in Ar saturated solution. The onset potentials of Pt-O and Pt-O(H) formation are 1.15 V(RHE) on Pt(100) and 1.2 V(RHE) on Pt(111) and Pt(110). The onset potential of Pt-O and Pt-O(H) and band shape differ from the results obtained using shell isolated surface enhanced Raman spectroscopy (SHINERS). The Pt-O and Pt-O(H) band intensities are normalized using COad as an internal standard. The Pt-O(H) band intensity depends on surface structures as Pt(110) < Pt(111) ≪ Pt(100), whereas the Pt-O band gives a different intensity order for Pt(111) and Pt(110) as Pt(111) ≤ Pt(110) ≪ Pt(100) in O2 saturated solution.
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Affiliation(s)
- Fumiya Sugimura
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
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