Chitosan and corn stover derivative bioadsorbent: characterization and application in hexavalent chromium adsorption processes

Autor(es)

de Andrade Neto, Jose Carlos ^[1] ; Pereira, Gilberto Jose ^[2] ; Morandim-Giannetti, Andreia de Araujo ^[1]

Afiliação do(s) autor(es)

^[1] Ctr Univ FEI, Dept Chem Engn, Av Humberto de Alencar Castelo Branco 3972, BR-09850901 Sao Paulo - Brazil

^[2] Ctr Univ FEI, Dept Mat Engn, Av Humberto de Alencar Castelo Branco 3972, BR-09850901 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Cellulose; v. 27, n. 11 MAY 2020.
• Citações Web of Science: 0

Resumo

Several studies related to effluents treatment containing heavy metals have been developed, especially those that enable the application of lignocellulosic residues and natural polymers as well as chitosan to obtain adsorbents. In this study, carboxymethylcellulose (CMC) was obtained from corn stover to react with chitosan (CH) and ferulic acid (F) to synthesize a bioadsorbent (CMCCHF). This biomaterial was characterized by Fourier transform infrared spectra, differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy, and nuclear magnetic resonance. The ideal application condition of CMCCHF in the hexavalent chromium adsorption process was established resulting in a pH of 3.0, 60 min of contact time, and 20 degrees C of temperature by a physisorption process, according to the pseudo-second order kinetic model and Langmuir isotherm model, respectively. The results showed a maximum adsorption capacity of 80.31 +/- 0.67 mg g(-1) for the bioadsorbent CMCCHF and 55.04 +/- 0.84 mg g(-1) for chitosan, which suggests an increase in the adsorption capacity of approximately 46%. A decrease in the solubilization of the adsorbent in acid medium was also observed when compared to chitosan, which favors its application in low pH adsorption processes. (AU)

• Processo FAPESP: 17/05485-3 - Avaliação da adsorção de cromo em carboximetilcelulose obtida a partir de palha de milho modificada e ativada com diferentes líquidos iônicos
• Beneficiário: José Carlos de Andrade Neto
• Linha de fomento: Bolsas no Brasil - Mestrado