Banca de QUALIFICAÇÃO: WESLEN FERNANDES DA SILVA MATUSIAKI

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : WESLEN FERNANDES DA SILVA MATUSIAKI
DATA : 06/07/2026
HORA: 09:00
LOCAL: meet.google.com/zkx-kkmm-enp
TÍTULO:

Production, Characterization, and Application of Biochar Obtained from Corn Straw as an Adsorbent for the Removal of Textile Dye from Aqueous Solution

PALAVRAS-CHAVES:

Pyrolysis. Chemical activation. Adsorption.

PÁGINAS: 62
GRANDE ÁREA: Outra
ÁREA: Multidisciplinar
RESUMO:

Agricultural activities in the state of Mato Grosso generate large volumes of corn straw, whose improper management can cause environmental and operational impacts in the field. Converting this biomass into biochar via pyrolysis emerges as an alternative for residue valorization, with potential application as an adsorbent due to its porosity and the presence of surface functional groups. In parallel, textile industry effluents may contain reactive dyes with high stability and difficult removal by conventional treatments, such as the
anionic reactive red BF-4B. In this context, this study aimed to evaluate the potential of biochars produced from corn straw as adsorbents for the removal of textile dye in aqueous media. The biochars were produced after biomass pre-treatment (cutting and grinding) and chemical activation with 85% phosphoric acid, followed by drying and pyrolysis according to a full 2222 factorial design with three replicates at the central point, varying temperature (300, 500, and 700 °C) and residence time (1, 3, and 5 h). Adsorptive efficiency was evaluated in batch tests (7 h, shaking in an orbital shaker), quantifying dye removal by UV–Vis spectrophotometry at
510 nm. As partial results, the experimental design indicated higher removals under the conditions 500 °C/3 h (92.93 ± 2.04%; 91.31 ± 0.46%; 89.17 ± 1.40%), 700 °C/1 h (90.04 ± 1.08%), and 700 °C/5 h (89.78 ± 0.96%), with no statistical difference among these treatments (Tukey, p<0.05p<0.05), whereas
300 °C/1 h showed intermediate performance (58.96 ± 7.96%) and 300 °C/5 h the lowest value (31.90 ± 2.90%). ANOVA indicated that the effects of temperature, time, and their interaction were not significant (p>0.05p>0.05), suggesting similar performance within the optimum range of 500–700 °C.
Seeking greater energy sustainability, the condition of 500 °C for 1 h was tested, yielding 90.79 ± 1.81% removal, with no significant difference compared to longer times at the same temperature. FTIR characterization showed that increasing pyrolysis severity promotes a transition from a more functionalized
matrix (O–H, aliphatic C–H, and C=O bands) to a more aromatic andcondensed structure (aromatic C=C), with a reduction of oxygenated groups at higher temperatures. Thus, the continuation of the study was directed to the biochar produced at 500 °C/1 h, as it combined high removal efficiency with lower energy cost of processing.

MEMBROS DA BANCA:
Presidente - 253800001 - RAQUEL APARECIDA LOSS
Interna - 279342002 - DANIELLE STORCK TONON
Externa ao Programa - 52978001 - CLAUDINEIA APARECIDA QUELI GERALDI