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Title: | Selective Pd recovery from acidic leachates by 3-mercaptopropylphosphonic acid grafted TiO2: does surface coverage correlate to performance? | Authors: | Gys, Nick PAWLAK, Bram Lufungula, Leon Luntadila Marcoen, Kristof Wyns, Kenny Baert, Kitty Atia, Thomas Abo Spooren , Jeroen ADRIAENSENS, Peter Blockhuys, Frank Hauffman, Tom Meynen, Vera MULLENS, Steven Michielsen, Bart |
Issue Date: | 2022 | Publisher: | ROYAL SOC CHEMISTRY | Source: | RSC Advances, 12 (55) , p. 36046 -36062 | Abstract: | Modification of metal oxides with organophosphonic acids (PAs) provides the ability to control and tailor the surface properties. The metal oxide phosphonic acid bond (M-O-P) is known to be stable under harsh conditions, making PAs a promising candidate for the recovery of metals from complex acidic leachates. The thiol functional group is an excellent regenerable scavenging group for these applications. However, the research on organophosphonic acid grafting with thiol groups is very limited. In this study, four different metal sorbent materials were designed with different thiol surface coverages. An aqueous-based grafting of 3-mercaptopropylphosphonic acid (3MPPA) on mesoporous TiO2 was employed. Surface grafted thiol groups could be obtained in the range from 0.9 to 1.9 groups per nm(2). The different obtained surface properties were studied and correlated to the Pd adsorption performance. High Pd/S adsorption efficiencies were achieved, indicating the presence of readily available sorption sites. A large difference in their selectivity towards Pd removal from a spend automotive catalyst leachate was observed due to the co-adsorption of Fe on the titania support. The highest surface coverage showed the highest selectivity (K-d: 530 mL g(-1)) and adsorption capacity (Q(max): 0.32 mmol g(-1)) towards Pd, while strongly reducing the co-adsorption of Fe on remaining TiO2 sites. | Notes: | Michielsen, B (corresponding author), Flemish Inst Technol Res VITO NV, Sustainable Mat, Boeretang 200, B-2400 Mol, Belgium. bart.michielsen@vito.be |
Document URI: | http://hdl.handle.net/1942/39182 | e-ISSN: | 2046-2069 | DOI: | 10.1039/d2ra07214a | ISI #: | 000899118700001 | Rights: | 2022 The Author(s). Published by the Royal Society of Chemistry. Open access Articel. Thias articel is licensed under Creative Commons Atributtion-non comercial 3.0 Unported Licence. | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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Selective Pd recovery from acidic leachates by 3-mercaptopropylphosphonic acid grafted TiO2_ does surface coverage correlate to performance_.pdf | Published version | 1.22 MB | Adobe PDF | View/Open |
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