Selective Adsorption of Precious Metals on Sulfur-Containing Chitosan Derivatives

1994 ◽  
Vol 23 (1) ◽  
pp. 117-120 ◽  
Author(s):  
Yoshinari Baba ◽  
Hiroyuki Hirakawa ◽  
Yoshinobu Kawano
Keyword(s):  
Selective Adsorption ◽  
Precious Metals ◽  
Chitosan Derivatives ◽  
Sulfur Containing

Recovery of Precious Metals by Selective Adsorption on Dimethylamine-Modified Persimmon Peel

2010 ◽  
Vol 1 (3) ◽  
pp. 339-345 ◽  
Author(s):  
Ying Xiong ◽  
Chaitanya Raj Adhikari ◽  
Hidetaka Kawakita ◽  
Keisuke Ohto ◽  
Hiroyuki Harada ◽  
...  
Keyword(s):  
Selective Adsorption ◽  
Precious Metals

Sulfur-Containing Chitin and Chitosan Derivatives as Trace Metal Adsorbents: A Review

2013 ◽  
Vol 43 (16) ◽  
pp. 1741-1794 ◽  
Author(s):  
S. K. Yong ◽  
N. S. Bolan ◽  
E. Lombi ◽  
W. Skinner ◽  
E. Guibal
Keyword(s):  
Trace Metal ◽  
Chitosan Derivatives ◽  
Chitin And Chitosan ◽  
Sulfur Containing

scholarly journals Silicas Chemically Modified with Sulfur-Containing Groups for Separation and Preconcentration of Precious Metals Followed by Spectrometric Determination

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 481
Author(s):  
Vladimir Losev ◽  
Evgeney Elsuf’ev ◽  
Elena Borodina ◽  
Olga Buyko ◽  
Natalya Maznyak ◽  
...  
Keyword(s):  
Certified Reference Materials ◽  
Precious Metals ◽  
Substitution Reactions ◽  
Thiourea Derivatives ◽  
Chemically Modified ◽  
Dipropyl Disulfide ◽  
Separation And Preconcentration ◽  
High Concentrations ◽  
Precious Metal Ions ◽  
Sulfur Containing

Silicas chemically modified with a number of sulfur-containing groups (mercaptopropyl, mercaptophenyl, dipropyl disulfide, thiadiazole thiol, dithiocarbamate and thiourea derivatives) were proposed for the separation and preconcentration of precious metals. These adsorbents quantitatively extracted precious metals from 0.5 to 4 M solutions of hydrochloric acid. It allowed their separation from high concentrations of non-ferrous, alkaline earth, alkali and some other related metals. The selectivity of separation of kinetically labile precious metal ions in ligand substitution reactions from kinetically inert ones depended on the nature of sulfur atom within the functional group of adsorbents and increased when passing from thione to thiol sulfur. Approaches for the preconcentration of precious metals using silicas chemically modified with sulfur-containing groups prior to their AAS, ICP-OES, and ICP-MS determination in ores, concentrates and their processing products were proposed. The correctness of the developed methods was confirmed by the analysis of certified reference materials.

Thiol functionalized mesoporous silicas for selective adsorption of precious metals

2012 ◽  
Vol 35 ◽  
pp. 20-26 ◽  
Author(s):  
Huajun Zheng ◽  
Denghong Hu ◽  
Lei Zhang ◽  
Chun’an Ma ◽  
Tom Rufford
Keyword(s):  
Selective Adsorption ◽  
Precious Metals ◽  
Mesoporous Silicas

scholarly journals Preconcentration And Determination Of Precious Metals Using Silica Gel Chemically Modified With Products Of Interaction Of O- or p-Aminotiophenols With g-(Trietoxisilane)Propylisocyanate

2020 ◽  
Vol 15 (2) ◽  
pp. 53-56
Author(s):  
A.K. Trofimchuk ◽  
V.N. Losev ◽  
V.V. V.V. ◽  
E.V. Elsuf’ev ◽  
N.V. Gudymа
Keyword(s):  
Precious Metals ◽  
Silica Gels ◽  
Luminescence Spectroscopy ◽  
Surface Complexes ◽  
Chemically Modified ◽  
Gold Silver ◽  
Lower Oxidation ◽  
Sulfur Containing ◽  
Better Than

The synthesis of new complexing adsorbents with thiophenol (MPhS) and aminobenzthiazolpropyl (ABTS) groups grafted onto the surface of silica gels are considered. The extraction of precious metals (Au(III), Ag(I), Pd(II), Pt(II,IV), Rh(III), Ir(IV), Ru(IV), Os(IV)) from solutions of hydrochloric acid by MPhS and ABTS adsorbents. Contact time, acidity, temperature (25 – 95 °C), and the presence of a labilization agent tin(II) chloride is examined. It is shown that the adsorption properties of MPhS for precious metals are better than ABTS. It was proved by luminescence spectroscopy that gold, silver and platinum in the surface complexes with sulfur-containing groups are in lower oxidation states; and by the EPR method it was proved that ruthenium and osmium in surface complexes are in oxidation state +3. The formation of luminescent Ag(I), Au(I) and Pt(II) complexes on the surface of the MPhS, colored Ru(III) complexes on the surface of MPhS and ABTS, and mixed-ligand complexes of Pt(II) with surface aminobenzthiazole groups and Michler’s thioketone were used for developing methods of their adsorption luminescent, adsorption-photometric and test determinatio

scholarly journals Selective Adsorption of Mercury(II) on Chitosan Derivatives from Hydrochloric Acid.

1998 ◽  
Vol 14 (4) ◽  
pp. 687-690 ◽  
Author(s):  
Yoshinari BABA ◽  
Naohiko MATSUMURA ◽  
Kohichiro SHIOMORI ◽  
Yoshinobu KAWANO
Keyword(s):  
Hydrochloric Acid ◽  
Selective Adsorption ◽  
Chitosan Derivatives
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