This work presents the steps preparation of the Caucasian hair, for later carbonization and its transformation as carbonaceous material, aiming the production of a carbonaceous material activated from a raw material coming from residues. Some of the steps are the conversion of hair into felt and the subsequent oxidation which aims to eliminate the cortex and promote crosslinking between the protein chains. This process allows the hair to be transformed into a thermoset, as well as to promote evaporation of the hair cortex, leaving the hollow filament. As a sequential step, carbonization and activation of the obtained material was carried out. Such conditions indicate that Caucasian hair can become an activated carbon fiber of high surface area and high adsorption capacity, desirable characteristics for a future application as molecular sieve.
Carbon material is the largest material used as electrode on advanced energy storage devices. The modern lifestyle requires more energy, consequently, more smart energy use and efficient devices are needed. The constant evolution of materials technologies looking for green material and renewable raw material, that have minimal impact on the environment, is one of the most important subjects studied in recent years. The scientific and industry community are paying more attention to new forms of carbon such as nanotubes, graphene, and activated carbon fiber. The purpose of this work is to convert human hair into a hollow carbon filament to be used as a supercapacitor electrode. The human hair needs 3 stages to be converted into carbon filament: textile manufacture, oxidation, and carbonization. The electrochemical behavior was analyzed in a threeelectrode electrochemical cell system with 2 M of H 2 SO 4 electrolyte medium. The behavior of the electrode was characterized electrochemically by galvanostatic charge/discharge curves, cyclic voltammetry, and electrochemical impedance spectroscopy, showing 163 F g -1 of a maximum value of specific capacitance.
Esse trabalho apresenta as etapas de preparação do cabelo caucasiano, uma alternativa de matéria prima de baixo custo, para posterior carbonização e sua transformação como material carbonoso. Algumas das etapas consistem na conversão do cabelo em feltro e a posterior oxidação que tem o objetivo de eliminar o córtex, permitindo obter fibras ocas e posterior material carbonoso. Tais condições indicam que o cabelo caucasiano pode tornar-se uma fibra de carbono de alta e rápida capacidade de adsorção para futura utilização como filtro molecular. PALAVRAS-CHAVE: cabelo; oxidação térmica; fibra de carbono. ABSTRACT: This work presents the steps of preparation of caucasian hair as an alternative raw low cost material, for carbonization and transformation as carbon material. Some of the steps are the conversion of the hair into felt and the subsequent oxidation that has the objective of eliminate the cortex, allowing to obtain hollow fibers and later carbon material. Such conditions indicate that caucasian hair can become a carbon fiber with high and fast adsorption capacity for future use as a molecular filter.
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