Different Sequential Chemical Treatments Used to Obtain Bleached Cellulose from Orange Bagasse

Autor(es)

Fernandes Pereira, Paulo Henrique ; Fernandes, Luana Lima ; Ubirajara Santos, Liziane Beatriz ; Ornaghi Jr, Heitor L. ; Hilario Cioffi, Maria Odila

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF NATURAL FIBERS; v. N/A, p. 13-pg., 2022-06-04.

Resumo

The development of efficient pretreatments is widely used in biobased products aiming to add value to the residue. In this study, orange bagasse is investigated for cellulose extraction under moderate chemical sequential extraction conditions. Three pretreatments are evaluated: alkaline treatment, organosolv, and residue insoluble alcohol. Then, all pretreated samples are bleached. The results are analyzed by chemical composition, Fourier transformed infrared spectroscopy, X-ray diffraction, and thermogravimetric analysis. In general, similar results are observed for all bleaching samples, independently of the pretreatment. A similar cellulose amount is observed among the samples. When compared only to the pretreatments, alkaline shows to be a more effective way of presenting a higher crystallinity index. Hemicellulose and lignin are mostly removed after pretreatment. FTIR and XRD indicated that the pretreatment seems to be more effective in the first step. TG curves presented a more homogeneous pattern due to cellulose removal showing three steps for pre-treatment and two steps for bleached samples. The obtained cellulose has numerous potential applications, and a suitable route can be selected according to available reagents. (AU)

• Processo FAPESP: 17/19530-0 - Preparação e caracterização de nanofibras de celulose a partir do bagaço de laranja pêra
• Beneficiário: Luana Lima Fernandes
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 15/10386-9 - Preparação e caracterização de filmes nanocompósitos biodegradáveis a partir de resíduos da casca e coroa do abacaxi para uso em embalagem
• Beneficiário: Paulo Henrique Fernandes Pereira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/16168-6 - Preparação e caracterização de celulose a partir do bagaço de laranja pêra
• Beneficiário: Liziane Beatriz Ubirajara Santos
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica