Electrosorptive desalination is a very simple and appealing approach to satisfy the increasing demand for drinking water. The large-scale application of this technology calls for the development of easy-to-produce, cheap and highly performing electrode materials and for the identification and tailoring of their most influential properties, as well. Here, biosynthesised bacterial cellulose is used as a carbon precursor for the production of three-dimensional nanostructures endowed with hierarchically porous architecture and different density and type of intrinsic and hetero-atom induced lattice defects. The produced materials exhibit unprecedented desa- lination capacities for carbon-based electrodes. At an initial concentration of 585 mg L −1 (10 mmol L −1 ), they are able to remove from 55 to 79 mg g −1 of salt; as the initial concentration rises to 11.7 g L −1 (200 mmol L −1 ), their salt adsorption capacity reaches values ranging between 1.03 and 1.35 g g −1 . The results of the thorough material characterisation by complementary techniques evidence that the relative amount of oxygenated surface functional species enhancing the electrode wettability play a crucial role at lower NaCl concentrations, whereas the availability of active non-sp 2 defect sites for adsorption is mainly influential at higher salt concentrations.

Bacterial-cellulose-derived carbonaceous electrode materials for water desalination via capacitive method: The crucial role of defect sites

Pantò, Fabiola;Triolo, Claudia;Santangelo, Saveria
Conceptualization
2020

Abstract

Electrosorptive desalination is a very simple and appealing approach to satisfy the increasing demand for drinking water. The large-scale application of this technology calls for the development of easy-to-produce, cheap and highly performing electrode materials and for the identification and tailoring of their most influential properties, as well. Here, biosynthesised bacterial cellulose is used as a carbon precursor for the production of three-dimensional nanostructures endowed with hierarchically porous architecture and different density and type of intrinsic and hetero-atom induced lattice defects. The produced materials exhibit unprecedented desa- lination capacities for carbon-based electrodes. At an initial concentration of 585 mg L −1 (10 mmol L −1 ), they are able to remove from 55 to 79 mg g −1 of salt; as the initial concentration rises to 11.7 g L −1 (200 mmol L −1 ), their salt adsorption capacity reaches values ranging between 1.03 and 1.35 g g −1 . The results of the thorough material characterisation by complementary techniques evidence that the relative amount of oxygenated surface functional species enhancing the electrode wettability play a crucial role at lower NaCl concentrations, whereas the availability of active non-sp 2 defect sites for adsorption is mainly influential at higher salt concentrations.
AMORPHOUS CARBON, BACTERIAL CELLULOSE, RAMAN SPECTROSCOPY, LATTICE DEFECTS, CAPACITIVE DEIONIZATION
HIERARCHICALLY POROUS CARBON
REDUCED GRAPHENE OXIDE
COMPOSITE ELECTRODES
FUNCTIONAL GROUPS
ION STORAGE
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12318/63635
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