A study of adsorption mechanism of dodecylamine on sphalerite

Xu, Shihong; Kou, Jue; Sun, Tao; Jong, Kwangsok

doi:10.1016/j.colsurfa.2015.09.040

Cited by 26 publications

(9 citation statements)

References 24 publications

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“…Those peaks were induced by the antisymmetric stretching vibration of the C─H bonds in the alkyl chain of DDA. [31][32][33] For a sufficient barrier performance, the arrangement and orientation of the particles within the coating layer is important. For this aluminum sheet metal was coated and cross-section examined by SEM.…”

Section: Resultsmentioning

confidence: 99%

Freeze Drying of Organically Modified Layered Silicates as Key Step to Improve the Barrier Properties of Organic Coatings for High Power Electronics Protection

Lommes,

Hanf,

Patzelt

et al. 2024

Adv Materials Inter

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Organically modified layered silicates can be used as barrier pigments in organic coating systems to reduce the permeation of water vapor and gases, e.g., oxygen as well as harmful gases that promote corrosion. Unmodified layered silicates are not sufficient to reduce the permeation significantly. However, the arrangement and orientation of the particles have an enormous impact on the later performance in the barrier film. In organic solvents or non‐aqueous polymer matrices the non‐modified layered silicates cannot exfoliate adequately. The organic modification influences the layer spacing and the compatibility to organic solvents. Layered silicates are modified with dodecylamine to enhance the spacing layer. The spacing layer is enhanced by 55% caused by the organic modification as it is commonly known. In contrast to previous work freeze drying of the organically modified layered silicates improved the particle distribution and by this barrier properties significantly. The modified particles reduce the diffusion of water and oxygen by ≈99.6% and 97.2%, respectively. The corrosive gas test of electronic circuit boards shows no growth of dendrites and no failure of the electronics in contrast to protective coating without the layered silicates.

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Section: Resultsmentioning

confidence: 99%

Freeze Drying of Organically Modified Layered Silicates as Key Step to Improve the Barrier Properties of Organic Coatings for High Power Electronics Protection

Lommes,

Hanf,

Patzelt

et al. 2024

Adv Materials Inter

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“…According to the graph, the main peak of C 1s The high resolution XPS spectra of C 1s on the surface of original and reagent-treated sensors are shown in Figure 12b. According to the graph, the main peak of C 1s was at 284.80 eV, which demonstrates that the C on the surface approximates the characteristic peak of the nonbound state C due to trace hydrocarbon contamination on the surface of the sensor [31]. The spectra exhibited significant asymmetric characteristics, and the C 1s peak on the dissolution surface shifted 0.12 eV towards the high binding energy direction, thus indicating the existence of other carbon-containing species of C 1s [32].…”

Section: Surface Product Composition Analysis By Xpsmentioning

confidence: 88%

Recovery of Gold from Ore with Potassium Ferrocyanide Solution under UV Light

et al. 2021

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In this study, potassium ferrocyanide, a nontoxic cyanide precursor in dark and diffuse reflection environment, was applied as reagent for the leaching of gold. The free cyanide ions could gradually release from potassium ferrocyanide solution under the ultraviolet light. Orthogonal leaching experiments were performed in gold ore to analyze the effect of solution pH, potassium ferrocyanide dosage, and temperature in a potassium ferrocyanide solution system under UV light. Response surface methodology (RSM) was applied to explore the role of potassium ferrocyanide in gold leaching; optimized results showed that the gold recovery reached 67.74% in a high-alkaline environment at a 12.6 pH, 3.8 kg/t potassium ferrocyanide dosage, 62 °C, and irradiance of 10 mW·cm−2. The gold leaching kinetics were monitored by quartz crystal microbalance with dissipation (QCM-D) of potassium ferrocyanide solution. The results indicate that the gold extraction process could be divided into two stages: adsorption and leaching, and a rigid adsorption layer formed on the reaction surface. Furthermore, X-ray photoelectron spectroscopy (XPS) analysis of the gold sensor surface after leaching reaction showed that –C≡N appears on the gold sensor surface, and the gold is oxidized to form AuCN complexes.

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“…According to the flotation solution chemical calculation, the changes of species on the sphalerite's surface with pH are shown in Figure 7, and the lgC-pH curves of dodecylamine are shown in Figure 8. As the pH increased, the dominant species on the sphalerite surface gradually transitioned from Zn 2+ cations to Zn 2 S 3− , Zn(OH) 2− 4 , and Zn(OH) − 3 anions, and the electronegativity gradually increased [20]. When the surface of sphalerite was negatively charged, the cationic collector dodecylamine could be physically adsorbed on the surface of sphalerite, and the recovery of sphalerite increased gradually.…”

Section: Solution Chemistry Analysismentioning

confidence: 99%

Flotation Mechanism of Sphalerite by Sulfuration–Amine Method

Piao

Pang

et al. 2023

Minerals

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Sphalerite is a common sulfide mineral, and xanthate is usually used as the collector of sphalerite flotation. In order to realize the simultaneous flotation of sphalerite- and zinc-containing oxide ores, in this paper, dodecylamine was used as the collector and sodium sulfide as the regulator to explore the flotation behavior of sphalerite in a sulfuration–amine system through single mineral flotation tests, and several analytical methods, including contact angle measurement, adsorption capacity test, FT-IR, and XPS, were employed to discuss the interaction mechanism of dodecylamine on the surface of sphalerite. The results confirm that dodecylamine had a strong collecting effect on sphalerite throughout almost the entire pH range, and the flotation recovery increased with the increase in pH, reaching 86.81% at pH 12. It was found that the effect of sodium sulfide on the floatability of sphalerite was relatively weak, and a weak activation effect, of about 2% improved recovery, was achieved. The results of the mechanism analysis further show that dodecylamine underwent both physical adsorption and chemical adsorption on the surface of sphalerite, and the physical adsorption was enhanced with the increase in pH. The above findings provide evidence for the simultaneous flotation of zinc-containing sulfide-oxide mixed minerals.

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A study of adsorption mechanism of dodecylamine on sphalerite

Cited by 26 publications

References 24 publications

Freeze Drying of Organically Modified Layered Silicates as Key Step to Improve the Barrier Properties of Organic Coatings for High Power Electronics Protection

Freeze Drying of Organically Modified Layered Silicates as Key Step to Improve the Barrier Properties of Organic Coatings for High Power Electronics Protection

Recovery of Gold from Ore with Potassium Ferrocyanide Solution under UV Light

Flotation Mechanism of Sphalerite by Sulfuration–Amine Method

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