TY - JOUR
T1 - Application of organo-ceramic adsorbents functionalized with imidazole for noble metal separations
AU - Lee, J. S.
AU - Tavlarides, L. L.
N1 - Funding Information:
The financial support of National Science Foundation through No. CTS-9805118 is gratefully acknowledged.
PY - 2002
Y1 - 2002
N2 - Imidazole-functionalized organo-ceramic adsorbents are synthesized by sol-gel processing to selectively extract noble metals. For the synthesis of these materials, N-(3-triethoxysilylpropyl)- 4,5-dihydroimidazole is used as the functional precursor and tetraethoxysilane is used as the cross-linking agent. The adsorbent synthesized at optimal conditions (SOL-IPS-F-22) has 3.0 mmol/g of ligand density and maximum uptake capacities of 1.54, 1.41, and 2.43 mmol/g for Pd(II), Pt(IV), and Au(III), respectively, at 0.1 M HCl concentration. This adsorbent has high stability, fast palladium uptake kinetics, and no adsorption of copper and iron ions. A multi-metal breakthrough experiment shows SOL-IPS-F-22 has high potential to extract these noble metals from other transition metal ions and the possibility to separate individual noble metals by a multiple column operation.
AB - Imidazole-functionalized organo-ceramic adsorbents are synthesized by sol-gel processing to selectively extract noble metals. For the synthesis of these materials, N-(3-triethoxysilylpropyl)- 4,5-dihydroimidazole is used as the functional precursor and tetraethoxysilane is used as the cross-linking agent. The adsorbent synthesized at optimal conditions (SOL-IPS-F-22) has 3.0 mmol/g of ligand density and maximum uptake capacities of 1.54, 1.41, and 2.43 mmol/g for Pd(II), Pt(IV), and Au(III), respectively, at 0.1 M HCl concentration. This adsorbent has high stability, fast palladium uptake kinetics, and no adsorption of copper and iron ions. A multi-metal breakthrough experiment shows SOL-IPS-F-22 has high potential to extract these noble metals from other transition metal ions and the possibility to separate individual noble metals by a multiple column operation.
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U2 - 10.1081/SEI-120004814
DO - 10.1081/SEI-120004814
M3 - Article
AN - SCOPUS:0036339931
SN - 0736-6299
VL - 20
SP - 407
EP - 427
JO - Solvent Extraction and Ion Exchange
JF - Solvent Extraction and Ion Exchange
IS - 3
ER -