Gold enhanced spectroelectrochemical investigation of 2-mercaptobenzothiazole, isopropyl xanthate and butylethoxycarbonylthiourea adsorption on minerals

Hope, Gregory Alan; Buckley, Fionnuala M.; Munce, Carolyn G.; Woods, R.

doi:10.1016/j.mineng.2007.02.003

Cited by 22 publications

(5 citation statements)

References 9 publications

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“…Diisoamyl dixanthogen fluoresced when irradiated with 633 nm light and was collected using 442 nm excitation. Its spectrum is similar to spectra published for dixanthogens of other chain lengths (38,39) and shows a SS stretch at 493 cm -1 , a C=S stretch at 697 cm -1 , a CCC symmetric stretch at 780 cm -1 , a CH 3 /CH 2 rock at 917 cm -1 and a CSC antisymmetric stretch at 1047 cm -1 . Lastly, a spectrum from a pyrite sample, conditioned for 3 days in 1 mM KAX solution then rinsed, is displayed: aside from the pyrite bands at ~340 cm -1 and ~380 cm -1 , bands consistent with dixanthogen are clearly evident.…”

Section: Raman Studies Of the Interaction Of Potassium Isoamyl Xantha...supporting

confidence: 76%

A Raman Spectroscopic Investigation of Pyrite Oxidation and Flotation Reagent Interaction

Parker

Hope

2010

ECS Trans.

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The oxidation of pyrite and the interaction of xanthate or hydroxamate flotation collectors with the pyrite surface were investigated via normal and surface-enhanced Raman scattering (SERS) techniques. SERS was facilitated via vapour deposition of a discontinuous gold island film or through the application of silver colloids to the pyrite surface. The oxidation of pyrite produced a Raman-inactive solid phase, in addition to octasulfur. 442 nm irradiation could induce the formation of polymeric sulfur from the pyrite oxidation products. Dixanthogen was the major species present on pyrite conditioned with xanthate solutions under oxidizing conditions, although a bound xanthate species was also evident, particularly at reducing potentials. The interaction of hydroxamate with pyrite under oxidizing conditions produced a ferric hydroxamate compound.

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Section: Raman Studies Of the Interaction Of Potassium Isoamyl Xantha...supporting

confidence: 76%

A Raman Spectroscopic Investigation of Pyrite Oxidation and Flotation Reagent Interaction

Parker

Hope

2010

ECS Trans.

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“…Recently, surface-enhanced Raman scattering (SERS) techniques have been developed to identify species formed on mineral surfaces which were coated with a sputtered film of gold (Hope et al, 2007). In this study, surface-enhanced Raman spectroscopy was used to characterize the reaction products formed on pyrite surfaces in copper cyanide solutions.…”

Section: Surface-enhanced Raman Spectroscopymentioning

confidence: 99%

The interaction between copper species and pyrite surfaces in copper cyanide solutions

Guo

Peng

2017

International Journal of Mineral Processing

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The adsorption of copper ions and the formation of a copper sulfide phase on pyrite surfaces are of vital importance to alter the surface property of pyrite and determine its fate either to be rejected in the flotation of polymetallic sulfide ores or to be recovered in the flotation of pyritic gold ores. Cyanide and copper may co-exist in the process water with complicated speciation. The objective of this study is to understand the interaction between copper cyanide species and pyrite and clarify the possible adsorption of copper on pyrite surfaces from cyanidebearing solutions. Surface-enhanced Raman spectroscopy and electrochemical measurements were used to determine the reaction products formed on pyrite surfaces. It was found that Cu(I)bearing species were incorporated into pyrite, forming a CuS-like sulfide from copper cyanide solutions at a more oxidizing potential, while a Cu 2 S-like sulfide formed at a more reducing potential. The amount of copper deposited on pyrite was significantly improved at a more reducing potential at which the pyrite surface tended to be FeS-like. In addition, these Cu(I)sulfides on pyrite surfaces were dissolved by cyanide-bearing species at a high CN/Cu ratio, compromising the total amount of copper uptake.

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“…Therefore, the development of a portable, highly sensitive, reproducible, inexpensive detection method is a practical pursuit that is commonly researched in the area of RDX detection. In recent years, surface-enhanced Raman scattering (SERS) has been extensively applied in food safety [17,18], ore composition [19], biomedicine [20] and detection of explosives [21] because of its good reproducibility, specificity and fast turnaround time.…”

Section: Introductionmentioning

confidence: 99%

The novel sandwich composite structure: a new detection strategy for the ultra-sensitive detection of cyclotrimethylenetrinitramine (RDX)

et al. 2022

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This study presents a novel sandwich composite structure that was designed for the ultra-sensitive detection of cyclotrimethylenetrinitramine (RDX). Au nanorod arrays (Au NRAs) were prepared and bound to 10-7 M 6-MNA as adsorption sites for RDX, while Au nanorods (Au NRs) were modified using 10-5 M 6-MNA as SERS probes. During detection, RDX molecules connect the SERS probe to the surface of the Au NRAs, forming a novel type of Au NRAs-RDX-Au NRs "sandwich" composite structure. The electromagnetic coupling effect between Au NRs and Au NRAs is enhanced due to the molecular level of the connection spacing, resulting in new "hot spots". Meanwhile, Au NRAs and Au NRs have an auto-enhancement effect on 6-MNA. In addition, the presence of charge transfer in the formed 6-MNA-RDX complex induced chemical enhancement. The limits of detection (LOD) of RDX evaluated by Raman spectroscopy using 6-MNA were as low as 10-12 mg/ml (4.5×10-15 M) with good linear correlation between 10-12 and 10-8 mg/ml (correlation coefficient R2 = 0.9985). This novel sandwich composite structure accurately detected RDX contamination in drinking water and on plant surfaces in an environment with detection limits as low as 10−12 mg/ml and 10−8 mg/ml.

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Gold enhanced spectroelectrochemical investigation of 2-mercaptobenzothiazole, isopropyl xanthate and butylethoxycarbonylthiourea adsorption on minerals

Cited by 22 publications

References 9 publications

A Raman Spectroscopic Investigation of Pyrite Oxidation and Flotation Reagent Interaction

A Raman Spectroscopic Investigation of Pyrite Oxidation and Flotation Reagent Interaction

The interaction between copper species and pyrite surfaces in copper cyanide solutions

The novel sandwich composite structure: a new detection strategy for the ultra-sensitive detection of cyclotrimethylenetrinitramine (RDX)

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