Facile synthesis of thiolated silica-encapsulated magnetic adsorbents: Effective adsorption and rapid separation of Au(Ⅰ) from thiosulfate solution
Source abstract
Abstract
It is important to develop a facile and highly efficient synthetic strategy to fabricate an adsorbent exhibiting excellent adsorption performance and separation ability to recover Au from thiosulfate solutions. Herein, we report a magnetic silica composite (Fe 3O 4 @SiO 2 -SH) that was successfully fabricated using an economical, one-pot synthesis method for efficient Au(I) adsorption. The results revealed that the performance of the adsorbent was pH dependent, and the single saturated adsorption capacity was 15.11 mg/g. The adsorption process could be well-explained by the Elovich kinetic model and Langmuir isotherm model, indicating that chemical adsorption dominated the monolayer adsorption process. Furthermore, the adsorption process was exothermic. The chemical structures and properties of the adsorbents were analyzed using various characterization and analysis methods. The chelating interaction between -SH and Au(I) promoted the adsorption of Au on Fe 3O 4 @SiO 2-SH. The gold-loaded, highly reusable adsorbent could be readily eluted using Na 2S 2O 3 (3 mol/L), and > 90% of the gold could be recovered from the adsorbent in a thiosulfate gold leaching solution with Cu 2+-NH 3-S 2O 3 2- as the leaching system. Most of the adsorbent in the pulp could be collected using a magnet, and this reduced the separation cost. The adsorbent can recover more than 90% of gold in both simulated and actual thiosulfate-based gold leaching solutions, indicating that the results reported herein provide a cost-effective strategy for the fabrication of magnetic silica composites characterized by a satisfactory adsorption capacity.
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Research context
OpenAlex topics: Extraction and Separation Processes · Adsorption and biosorption for pollutant removal · Minerals Flotation and Separation Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (54)
Show source-provided references
1. Environmentally friendly extraction of gold from refractory concentrate using a copper – ethylenediamine – thiosulfate solution10.1016/j.jclepro.2019.01.007 ↗
2. Thiosulphate leaching of gold in the Cu–NH3–S2O32−–H2O system: An updated thermodynamic analysis using predominance area and species distribution diagrams10.1016/j.mineng.2020.106336 ↗
3. Ammoniacal thiosulfate leaching of pressure oxidized sulfide gold concentrate with low reagent consumption10.1016/j.hydromet.2014.10.014 ↗
4. Novel extraction process for gold recovery from thiosulfate solution using phosphonium ionic liquids10.1021/acssuschemeng.1c01705 ↗
5. Gold cementation from ammonium thiosulfate solution by zinc, copper and aluminium powders10.2320/matertrans.43.485 ↗
6. Applying an external reduction potential to reduce the consumption of zinc powder during gold cementation10.1016/j.mineng.2022.107981 ↗
7. Eco-friendly and reagent recyclable gold extraction by iodination leaching-electrodeposition recovery10.1016/j.jclepro.2021.129115 ↗
8. Kinetic studies of gold leaching from a gold concentrate calcine by thiosulfate with cobalt-ammonia catalysis and gold recovery by resin adsorption from its pregnant solution10.1016/j.seppur.2018.12.064 ↗
9. Modification of activated carbon by chemical vapour deposition through thermal decomposition of thiourea for enhanced adsorption of gold thiosulfate complex10.1016/j.seppur.2020.116632 ↗
10. Adsorption of the gold–thiosulfate complex ion onto cupric ferrocyanide (CuFC)-impregnated activated carbon in aqueous solutions10.1016/j.hydromet.2015.04.009 ↗
11. The use of new modified activated carbon in thiosulfate solution: A green gold recovery technology10.1016/j.seppur.2019.115834 ↗
12. Making untreated carbon effective in cleaner thiosulfate system: A new and high-efficiency method including gold adsorption and desorption10.1016/j.jclepro.2021.130185 ↗
13. In-situ Reduction of Au(Ⅰ) for Efficient Recovery of Gold from Thiosulfate Solution by 3D MoS2/Chitosan Aeroge10.1021/acssuschemeng.9b06639 ↗
14. The recovery of gold from ammoniacal thiosulfate solutions containing copper using ion exchange resin columns10.1016/S0304-386X(03)00183-X ↗
15. Interfacial properties of mercaptopropyl-functionalised silica gel and its adsorption performance in the recovery of gold(I) thiosulfate complex10.1016/j.cej.2020.124547 ↗
16. In-situ reduction of gold thiosulfate complex on molybdenum disulfide nanosheets for a highly-efficient recovery of gold from thiosulfate solutions10.1016/j.hydromet.2020.105369 ↗
17. Calcined high-sulfur coal for highly efficient adsorption of Au(S2O3)23– from a gold thiosulfate leaching solution using an external reduction potential10.1021/acssuschemeng.2c02215 ↗
18. Magnetic phosphorylated chitosan composite as a novel adsorbent for highly effective and selective capture of lead from aqueous solution10.1016/j.jhazmat.2020.124195 ↗
19. Magnetic nanoparticles: design and characterization, toxicity and biocompatibility, pharmaceutical and biomedical applications10.1021/cr300068p ↗
20. Highly efficient removal of toxic lead ions from aqueous solutions using a new magnetic metal‐organic framework nanocomposite10.1002/jccs.201800378 ↗
21. Review on the progress in synthesis and application of magnetic carbon nanocomposites10.1039/c1nr10165j ↗
22. Functionalized lignin-based magnetic adsorbents with tunable structure for the efficient and selective removal of Pb(II) from aqueous solution10.1016/j.cej.2021.130409 ↗
23. On the Use of Magnetite for Gold Recovery From Chloride Solution10.1080/08827508.2010.483359 ↗
24. Melamine sponge loading improves the separation performance of magnetic hydroxyapatite for Pb(Ⅱ) adsorption10.1016/j.seppur.2022.120851 ↗
25. Gold recovery from copper anode slime by means of magnetite nanoparticles (MNPs)10.1016/j.hydromet.2014.01.007 ↗
26. Gold recovery from ammonia-thiosulfate leaching solution assisted by PEI-functionalized magnetite nanoparticles10.1016/j.hydromet.2019.105128 ↗
27. Extraction of Gold and Copper from a Gold Ore Thiosulfate Leachate by Use of Functionalized Magnetic Nanoparticles10.1080/08827508.2019.1636048 ↗
28. PVP modified Fe3O4@SiO2 nanoparticles as a new adsorbent for hydrophobic substances10.1016/j.jpcs.2019.05.004 ↗
29. Synthesis and characterization of Fe3O4@SiO2 magnetic composite nanoparticles by a one-pot process10.1007/s12613-016-1329-6 ↗
30. Synthesis and characterization of magnetic iron oxide – silica nanocomposites used for adsorptive recovery of palladium (II)10.1080/1539445X.2021.1999270 ↗
31. Silica-Coated Magnetic Nanocomposites for Pb2+ Removal from Aqueous Solution10.3390/app10082726 ↗
32. Removal of cadmium from aqueous solutions using inorganic porous nanocomposites10.1007/s11814-019-0262-6 ↗
33. Mercury(II) adsorption by a novel adsorbent mercapto-modified bentonite using ICP-OES and use of response surface methodology for optimization10.1016/j.microc.2018.01.028 ↗
34. Facile preparation of sulfhydryl modified montmorillonite nanosheets hydrogel and its enhancement for Pb(II) adsorption10.1016/j.chemosphere.2021.130727 ↗
35. Study of adsorption property and mechanism of lead(II) and cadmium(II) onto sulfhydryl modified attapulgite10.1016/j.arabjc.2020.102960 ↗
36. One-step processing of low-cost and superb natural magnetic adsorbent: kinetics and thermodynamics investigation for dye removal from textile wastewater10.1016/j.apt.2021.03.013 ↗
37. Decoration of serpentine with iron ore as an efficient low-cost magnetic adsorbent for Cr (VI) removal from tannery wastewater10.1016/j.powtec.2021.04.061 ↗
38. Interfacial properties of mercaptopropyl-functionalised silica gel and its adsorption performance in the recovery of gold(I) thiosulfate complex10.1016/j.cej.2020.124547 ↗
39. Study on oxygen pressure thiosulfate leaching of gold without the catalysis of copper and ammonia10.1016/j.hydromet.2019.05.006 ↗
40. Efficient environmental recovery of Au(I) from thiosulfate solution on triphenylphosphine-oxide-modified vermiculite10.1016/j.jclepro.2022.133993 ↗
41. Development of Stable, Efficient, and Recyclable Amine-Containing Microspheres for Gold(I) Thiosulfate Complex Recovery10.1021/acssuschemeng.2c05267 ↗
42. Highly effective removal of mercury and lead ions from wastewater by mercaptoamine-functionalised silica-coated magnetic nano-adsorbents: Behaviours and mechanisms10.1016/j.apsusc.2016.09.098 ↗
43. Superparamagnetic nanocomposite Fe3O4@SiO2-NH2/CQDs as fluorescent probe for copper (II) detection10.1016/j.matlet.2020.128404 ↗
44. Amino-functionalized Fe3O4@SiO2 core-shell magnetic nanoparticles for dye adsorption10.3390/nano11092371 ↗
45. Functionalized magnetic iron oxide (Fe3O4) nanoparticles for capturing gram-positive and gram-negative bacteria10.1166/jbn.2014.1848 ↗
46. Gold recovery from ammonia-thiosulfate leaching solution assisted by PEI-functionalized magnetite nanoparticles10.1016/j.hydromet.2019.105128 ↗
47. Influences of surface coating, UV irradiation and magnetic field on the algae removal using magnetite nanoparticles10.1021/es5049573 ↗
48. Use of carboxyl functional magnetite nanoparticles as potential sorbents for the removal of heavy metal ions from aqueous solution10.1021/je5011196 ↗
49. Thiol modified Fe3O4@SiO2 as a robust, high effective, and recycling magnetic sorbent for mercury removal10.1016/j.cej.2013.04.060 ↗
50. Surface engineered magnetic nanoparticles for removal of toxic metal ions and bacterial pathogens10.1016/j.jhazmat.2011.06.074 ↗
51. Magnetic adsorbent of Fe3O4@SiO2 core-shell nanoparticles modified with thiol group for chloroauric ion adsorption10.1016/j.apsusc.2016.03.099 ↗
52. Molecular Spectroscopy by Means of ESCA II. Sulfur compounds. Correlation of electron binding energy with structure10.1088/0031-8949/1/5-6/020 ↗
53. Comparison of self-assembled monolayers on gold: coadsorption of thiols and disulfides10.1021/la00087a027 ↗
54. XPS photoelectron spectra of cluster compounds of gold10.1016/S0020-1693(00)93875-1 ↗