Hydrodechlorination of Aroclor 1260 in Aqueous Two-phase Mixture Catalyzed by Biogenerated Bimetallic Catalysts

Baldi, Franco; Gallo, Michele; Paganelli, Stefano; Tassini, Riccardo; Sperni, Laura; Piccolo, Oreste; Zambon, Stefano; Piazza, Rossano; Natile, Marta Maria; Armelao, Lidia

doi:10.9734/irjpac/2016/25136

Cited by 4 publications

(11 citation statements)

References 27 publications

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“…Positive synergies among the different metals, embedded in a peculiar polysaccharide moiety, were found when Metx-EPS (I) was used as a catalyst in the removal of PCBs by hydrodechlorination reaction, permitting to work under milder conditions with a better efficacy than our previous studies where mono-or bimetallic Pd species prepared by the same microorganism had been used [5]. This result was not easily predictable, especially when the reaction was carried out in the presence of a sample of real water taken from a contaminated site.…”

Section: Resultsmentioning

confidence: 79%

“…So a new metals-polymeric composite, Met x -EPS (I) was obtained from exhausted catalytic converters and, after characterization with different methods, its catalytic activity and a possible synergic effect due to the presence of different metals embedded in EPS was verified in the hydrodechlorination treatment of a methanolic solution of polychlorinated biphenyls (PCBs) in distilled water and in a sample of polluted sea water (Mar Piccolo, Taranto, Italy). The results were compared with those recently obtained by us using Pd-EPS or Pd,Fe-EPS [5].…”

Section: Introductionmentioning

confidence: 92%

“…The quantitative analysis of XANES and EXAFS spectra is performed with the IFEFFIT program package [6] in combination with FEFF6 program code [7] for ab initio calculation of photoelectron scattering paths. The determination of PCB congeners was performed in full scan mode on a fused silica capillary column (HP5-MS 30 m, 0.25 mm x 0.25 mm; Agilent Technologies) installed in a ThermoFinnigan (Trace GC 2000) coupled to a quadrupole mass spectrometer (ThermoFinnigan Trace MS), using the same conditions described in our previous work [5].…”

Section: Materials and Instrumentationmentioning

confidence: 99%

“…A solution of 7 mg of Aroclor 1260 (~0.0195 mmol assuming MW 358 as medium value) in 2 ml of methanol was then added to the aqueous phase as well as 1.7 mg (0.021 mmol) of ammonium acetate. The Schlenk tube was then transferred into a 150 ml stainless steel autoclave under nitrogen, pressurized with 1 MPa of H 2 , instead of 3MPa used previously with Pd-EPS or Pd, Fe-EPS [5], and stirred at 60°C for 20 h. The reactor was then cooled to room temperature and opened under nitrogen. Then, the organic products were separated from the catalyst extracting them from the aqueous phase with 10 mL of n-hexane.…”

Section: Optimized Protocol Of Hydrodechlorination Of Aroclor 1260 Usmentioning

confidence: 99%

“…Removal of polychlorinated pollutants present in water by catalysed hydrodechlorination is still a challenging target due to the presence of different catalyst poisons. As part of our research activity in environmental remediation and in finding potential sustainable protocols using heterogeneous water compatible catalysts we had recently studied the hydrodechlorination of a methanolic solution of Aroclor 1260 (a reference PCB mixture) with Pd-EPS and Fe,Pd-EPS in pure distilled water in the presence of ammonium acetate [5] (Scheme 1).…”

Section: Catalyst Activitymentioning

confidence: 99%

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A Biogenerated Polymetallic Catalyst from Society's Wastes

Piccolo¹,

Paganelli

Zanatta

et al. 2019

CSIJ

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Aims: Preparation of the new metals-polymeric composite, Met x -EPS (I), to be used as a green catalyst in water or in two-phase aqueous conditions. Study Design: Recovery and valorization of polymetallic wastes to obtain directly new catalysts using a microorganism to explore their application in removal of difficult and dangerous chemical pollutants present in aqueous environment. Place and Duration of Study: Dipartimento di Scienze Molecolari 2 Methodology: For the preparation of Met x -EPS (I), the metals source was an exhausted catalytic converter that was grinded and treated with an acidic solution at 20-25°C. After filtration, the solution was concentrated, neutralized and added to a broth of Klebsiella oxytoca DSM 29614 to produce (I) where metals are embedded in a peculiar polysaccharide structure. The composite was easily recovered from the fermentation broth and purified. The process protocol was verified many times and was shown to be reproducible satisfactorily. The % recovery of metals, originally present in the converter, was good as determined by atomic absorption. The morphology and the chemical state of main metals in (I) were investigated by X-ray absorption spectroscopy methods (XANES and EXAFS). No metallic alloy seems to be evident. Results: As first application of (I) as catalyst, the hydrodechlorination treatment of polychlorinated biphenyls (PCBs) was studied in water/methanol. A significant removal of higher chlorinated congeners was observed working at 1MPA of hydrogen and 60°C. This result improves significantly and surprisingly the methodology, previously studied by us using mono-or bi-metals embedded in the same polysaccharide moiety, indicating that positive synergies among the different metals were operating. Conclusion: The preparation of this new polymetallic species embedded in a polysaccharide moiety starting from spent catalytic converters represents an alternative valorisation of metallic wastes. Moreover, a synergic effect was exerted by the different metals when the catalyst Met x -EPS (I) was used in the hydrodechlorination treatment of polychlorinated biphenyls (PCBs) in water/methanol. Finally, a promising preliminary proof of concept for the removal of polychlorinated aromatic pollutants even in contaminated aqueous sites was carried out.Keywords: Metals-polymeric composite; biogenerated polymetallic exopolysaccharide; new catalyst from metallic wastes; hydrodechlorination of PCBs in water.

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Section: Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 92%

Section: Materials and Instrumentationmentioning

confidence: 99%

Section: Optimized Protocol Of Hydrodechlorination Of Aroclor 1260 Usmentioning

confidence: 99%

Section: Catalyst Activitymentioning

confidence: 99%

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A Biogenerated Polymetallic Catalyst from Society's Wastes

Piccolo¹,

Paganelli

Zanatta

et al. 2019

CSIJ

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Sustainable Synthesis of Aryl and Heteroaryl Aldehydes

Paganelli

Tassini

Piccolo³

2022

ChemistrySelect

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Aromatic aldehydes are important intermediates for the synthesis of valuable fine and specialty chemicals and many procedures for their preparation have been developed but, nowadays, most of these synthetic methods require large amounts of reagents and multiple steps, with production of wastes. In this paper, we focused on the synthesis of some (hetero)aromatic aldehydes, used either as industrial flavor/fragrances of commercial interest, such as Heliotropine®, or as key intermediates for the preparation of some APIs and of other fragrances such as Lioral® and Helional®, by reductive carbonylation of halo derivative precursors. In order to carry out an easier and more applicable process, hydrogen donors, instead of gaseous flammable and explosive hydrogen, and recyclable phosphine free low metal content catalysts, were employed.

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