Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 560888
Title Sugarcane Biowaste-Derived Biochars as Capacitive Deionization Electrodes for Brackish Water Desalination and Water-Softening Applications
Author(s) Lado, Julio J.; Zornitta, Rafael L.; Vázquez Rodríguez, Inés; Malverdi Barcelos, Kamila; Ruotolo, Luís A.M.
Source ACS sustainable chemistry & engineering 7 (2019)23. - ISSN 2168-0485 - p. 18992 - 19004.
DOI https://doi.org/10.1021/acssuschemeng.9b04504
Department(s) Organic Chemistry
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) biowaste valorization - capacitive deionization - KOH activation - pyrolysis - sugarcane bagasse fly ash
Abstract

The sugarcane ethanol industry is currently generating an intensive amount of biowaste while consuming significant water resources. In this work, sugarcane bagasse fly ash (SCBFA), a major biowaste with high amounts of fixed carbon, is employed as a precursor for activated carbon (SCBFA-AC) production. Here, SCBFA-ACs are valorized as the main component of carbon electrodes employed in capacitive deionization (CDI), an emerging desalination technology. In this way, an abundant and low-cost biowaste could be used as a green alternative to treat the water. Different activation methods of SCBFA were explored obtaining SCBFA-AC with a broad spectrum of structural and chemical properties. The electrochemical characterization of SCBFA-AC showed the positive impact of large surface areas, good combination of micro- and mesopores, and the presence of surface functional groups on specific capacitances (117 F g-1). Subsequently, CDI and membrane CDI experiments showed the importance of ion-exchange membranes on improving charge efficiency values (from 5-30 to 80-95%) and consequently, salt adsorption capacity, SAC, from ≈5 to 22 mg g-1. This SAC value, one of the highest ever obtained with biowaste electrodes, only suffered a slight reduction (19 mg g-1) after 70 CDI cycles. Finally, SCBFA electrodes were successfully tested for water-softening applications, reaching 15 mg g-1 when operating using CaCl2 solutions instead of NaCl. This study represents a great example of the water-energy-food nexus in the framework of the circular economy.

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