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DESALINATION AND SEPARATION OF AMINO ACIDS BY ELECTROSSORPTION USING ELECTRODES OF ACTIVATED GRAPHENE

Abstract

In the last few years has being growing the interest by the technology called capacitive deionization (CDI) or electrosorption due to its low cost and application for desalination and water softening. In the Brazilian context, the development of CDI would be of great importance for brackish water desalination to provide drinkable water to the semiarid in order to promote the economic and social development. Another CDI application of great industrial importance would be the separation and purification of amino acids and enzymes, whose molecules can present positive or negative charges, thus allowing them to be separated by electrosorption. The CDI technology is based on the concept of charge storage on the electric double layer developed when electrodes are positively and negatively polarized, hence the development of electrode materials with high specific surface area (SSA) associated with a desired morphology and pore size distribution (PSD) is of prime interest. In this proposal, concepts of electrochemistry and materials science will be used to the development of new electrodes based on activated graphene in order to provide SSA and facilitate the mass transport, thus improving the kinetics. Different activation strategies will be studied in order to analyze its effect not only on the textural characteristics (SSA and PSD), but also to verify the effect of functional surface groups on the electrode characteristics such as wettability, surface resistivity, and capacitance. The best carbon materials will be used in a second step in which concepts of chemical and electrochemical engineering will be applied to study two electrosorption processes (desalination and amino acid separation) employing a CDI cell operating under potentiostatic and galvanostatic conditions in order to obtain the optimized process variables that maximize the desalination kinetics and charge efficiency, besides minimizing the specific energy consumption. (AU)

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SILVA, ALESSANDRA P.; ARGONDIZO, ALEXANDRE; JUCHEN, PATRICIA T.; RUOTOLO, LUIS A. M. Ultrafast capacitive deionization using rice husk activated carbon electrodes. Separation and Purification Technology, v. 271, SEP 15 2021. Web of Science Citations: 0.
BARCELOS, KAMILLA M.; OLIVEIRA, KAIQUE S. G. C.; SILVA, DOMINGOS S. A.; URQUIETA-GONZALEZ, ERNESTO A.; RUOTOLO, LUIS A. M. Efficient and stable operation of capacitive deionization assessed by electrode and membrane asymmetry. Electrochimica Acta, v. 388, AUG 20 2021. Web of Science Citations: 0.
FARIA, LURIMA U. S.; OLIVEIRA, KAIQUE S. G. C.; VEROLI, ALYNE B.; AQUINO, JOSE M.; RUOTOLO, LUIS A. M. Energy consumption and reaction rate optimization combining turbulence promoter and current modulation for electrochemical mineralization. CHEMICAL ENGINEERING JOURNAL, v. 418, AUG 15 2021. Web of Science Citations: 0.
BARCELOS, KAMILLA M.; OLIVEIRA, KAIQUE S. G. C.; RUOTOLO, LUIS A. M. Insights on the role of interparticle porosity and electrode thickness on capacitive deionization performance for desalination. DESALINATION, v. 492, OCT 15 2020. Web of Science Citations: 1.
ZORNITTA, RAFAEL L.; BARCELOS, KAMILLA M.; NOGUEIRA, FRANCISCO G. E.; RUOTOLO, LUIS A. M. Understanding the mechanism of carbonization and KOH activation of polyaniline leading to enhanced electrosorption performance. Carbon, v. 156, p. 346-358, JAN 2020. Web of Science Citations: 0.
LADO, JULIO J.; ZORNITTA, RAFAEL L.; VAZQUEZ RODRIGUEZ, INES; BARCELOS, KAMILA MALVERDI; RUOTOLO, LUIS A. M. Sugarcane Biowaste-Derived Biochars as Capacitive Deionization Electrodes for Brackish Water Desalination and Water-Softening Applications. ACS SUSTAINABLE CHEMISTRY & ENGINEERING, v. 7, n. 23, p. 18992-19004, DEC 2 2019. Web of Science Citations: 0.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.