The recycling of heavy metal contaminants from wastewater as a source of valuable products perfectly fits with the principles of a Circular Economy system in view of restoring pollutants back into the system endowed with new social and economic benefits. Heavy metals are often present in such a low concentration that it makes the removal efficiency difficult to realize through the conventional physicochemical methods with high selectivity. Biosorption, conversely, by EPSs (extracellular polymeric substances) produced by several bacterial cells’ strains, is gaining a great deal of attention as an economic, efficient and sustainable depolluting process of wastewater from metal cations such as copper. Metal coordination to EPS components was thus deeply investigated by 1H NMR titration experiments. The 1,10–Phenanthroline–copper complex was exploited for quantifying the ability of different strains to sequester copper by a practical UV-Vis spectrophotometric method. The obtained data distinguished Serratia plymuthica strain SC5II as the bacterial strain displaying copper-adsorbing properties higher than any other, with Stenotrophomonas sp. strain 13a resulting in the worst one. Different analytical techniques, i.e., Dynamic Light Scattering (DLS), FT-IR analysis and SEM spectroscopy were thus employed to rationalize these results. Finally, the obtained copper chelates were successfully employed as hybrid catalysts in the asymmetric boron addition to α,β-unsaturated chalcones for the synthesis of valuable pharmaceutical intermediates, thus placing waste management in a new circular perspective.

Hybrid Catalysts from Copper Biosorbing Bacterial Strains and Their Recycling for Catalytic Application in the Asymmetric Addition Reaction of B2(pin)2 on α,β-Unsaturated Chalcones / R. Gandolfi, G. Facchetti, L. Cavalca, S. Mazzini, M. Colombo, G. Coffetti, G. Borgonovo, L. Scaglioni, S. Zecchin, I. Rimoldi. - In: CATALYSTS. - ISSN 2073-4344. - 12(2022 Apr 11), pp. 433.1-433.12. [10.3390/catal12040433]

Hybrid Catalysts from Copper Biosorbing Bacterial Strains and Their Recycling for Catalytic Application in the Asymmetric Addition Reaction of B2(pin)2 on α,β-Unsaturated Chalcones

R. Gandolfi;G. Facchetti;L. Cavalca;S. Mazzini;M. Colombo;G. Coffetti;G. Borgonovo;L. Scaglioni;S. Zecchin;I. Rimoldi
2022-04-11

Abstract

The recycling of heavy metal contaminants from wastewater as a source of valuable products perfectly fits with the principles of a Circular Economy system in view of restoring pollutants back into the system endowed with new social and economic benefits. Heavy metals are often present in such a low concentration that it makes the removal efficiency difficult to realize through the conventional physicochemical methods with high selectivity. Biosorption, conversely, by EPSs (extracellular polymeric substances) produced by several bacterial cells’ strains, is gaining a great deal of attention as an economic, efficient and sustainable depolluting process of wastewater from metal cations such as copper. Metal coordination to EPS components was thus deeply investigated by 1H NMR titration experiments. The 1,10–Phenanthroline–copper complex was exploited for quantifying the ability of different strains to sequester copper by a practical UV-Vis spectrophotometric method. The obtained data distinguished Serratia plymuthica strain SC5II as the bacterial strain displaying copper-adsorbing properties higher than any other, with Stenotrophomonas sp. strain 13a resulting in the worst one. Different analytical techniques, i.e., Dynamic Light Scattering (DLS), FT-IR analysis and SEM spectroscopy were thus employed to rationalize these results. Finally, the obtained copper chelates were successfully employed as hybrid catalysts in the asymmetric boron addition to α,β-unsaturated chalcones for the synthesis of valuable pharmaceutical intermediates, thus placing waste management in a new circular perspective.
bacterial EPSs; heavy metal recycling; copper recovery; wastewater depollution;
Settore CHIM/03 - Chimica Generale e Inorganica
Settore CHIM/11 - Chimica e Biotecnologia delle Fermentazioni
Settore AGR/16 - Microbiologia Agraria
Settore CHIM/06 - Chimica Organica
CAR_RIC21LCAVA_01 - Heavy Metal Bio-recovery and Valorization (HMBV) - CAVALCA, LUCIA - CAR_RIC - Bandi Fondazione Cariplo - 2021
PSRL621PRISO_01 - One Health Action Hub: task force di Ateneo per la resilienza di ecosistemi territoriali (1H_Hub) (Linea Strategica 3, Tema One health, one earth) - RISO, PATRIZIA - PSR_LINEA6_ / Piano di sviluppo di ricerca - Grandi Sfide di Ateneo - Linea 6 - 2021
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/922488
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