[en] The brewery industry annually produces huge amounts of byproducts that represent an underutilized, yet valuable, source of biobased compounds. In this contribution, the two major beer wastes, that is, spent grains and spent yeasts, have been transformed into carbon dots (CDs) by a simple, scalable, and ecofriendly hydrothermal approach. The prepared CDs have been characterized from the chemical, morphological, and optical points of view, highlighting a high level of N-doping, because of the chemical composition of the starting material rich in proteins, photoluminescence emission centered at 420 nm, and lifetime in the range of 5.5-7.5 ns. With the aim of producing a reusable catalytic system for wastewater treatment, CDs have been entrapped into a polyvinyl alcohol matrix and tested for their dye removal ability. The results demonstrate that methylene blue can be efficiently adsorbed from water solutions into the composite hydrogel and subsequently fully degraded by UV irradiation.
Disciplines :
Chemistry
Author, co-author :
Cailotto, Simone; Department of Molecular Sciences and Nanosystems, Ca'Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy ; CSGI - Italian Research Center for Colloids and Surface Science, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Firenze, Italy
Massari, Daniele; Department of Molecular Sciences and Nanosystems, Ca'Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy ; CSGI - Italian Research Center for Colloids and Surface Science, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Firenze, Italy
Gigli, Matteo ; Department of Molecular Sciences and Nanosystems, Ca'Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy ; CSGI - Italian Research Center for Colloids and Surface Science, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Firenze, Italy
Campalani, Carlotta ; Université de Liège - ULiège > Département de chimie (sciences) > Center for Integrated Technology and Organic Synthesis ; Department of Molecular Sciences and Nanosystems, Ca'Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy
Bonini, Massimo ; CSGI - Italian Research Center for Colloids and Surface Science, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Firenze, Italy ; Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Firenze, Italy
You, Shujie ; Division of Material Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
Vomiero, Alberto; Department of Molecular Sciences and Nanosystems, Ca'Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy ; Division of Material Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
Selva, Maurizio ; Department of Molecular Sciences and Nanosystems, Ca'Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy
Perosa, Alvise ; Department of Molecular Sciences and Nanosystems, Ca'Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy
Crestini, Claudia ; Department of Molecular Sciences and Nanosystems, Ca'Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy ; CSGI - Italian Research Center for Colloids and Surface Science, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Firenze, Italy
Language :
English
Title :
N-Doped Carbon Dot Hydrogels from Brewing Waste for Photocatalytic Wastewater Treatment.
Università Ca' Foscari Venezia KAW - Knut and Alice Wallenberg Foundation
Funding text :
M.G. gratefully acknowledges Ca′ Foscari University FPI2019 grant. S.Y. and A.V. acknowledge the Kempe Foundation and the Knut & Alice Wallenberg Foundation for financial support.
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