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Hydrogen peroxide combined with acid treatment demonstrates its respective characteristics for the separation of lignocellulosic biomass. Herein, holocellulose was extracted from Cattail leaves (CL) by a two-step treatment with alkali and hydrogen peroxide-acetic acid (HPAA). Then carboxylated nanocellulose was hydrolyzed with a mixed organic/inorganic acid. The chemical composition of the holocellulose and the physicochemical properties of the separated carboxylated nanocellulose were comparable. Carboxyl groups were introduced on the nanocellulose as a result of the esterification process with citric acid (CA), which endows the nanocellulose with high thermal stability (315-318 °C) and good light transmission (>80 %). Furthermore, morphological analyses revealed that nanocellulose had a spider-web-like structure with diameter between 5 and 20 nm., Competing Interests: Declaration of competing interest We declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work, there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of the manuscript entitled., (Copyright © 2023 Elsevier B.V. All rights reserved.)

In this study, polyacrylonitrile (PAN) @ bamboo shoot shell cellulose nanowhisker (BSCN) @ carbon nanotube (CNT) electrospun composite membrane with enhanced dye adsorption performance was prepared. Methyl blue (MB) was used for dye experiment. The results showed that with the increase of BSCNs, the diameter of the nanofibers in composite membranes gradually increased. When 1.2% BSCNs was added, the removal rate of methylene blue is up to 92.56%, and the kinetics was also investigated. The prepared different composite membranes were characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, thermal gravimetric analysis (TGA) to investigate the surface morphology of fabricated structures, functional groups on the surface of nanofibers and thermal properties. The prepared TEMPO oxidized BSCN based composite membranes can be used as an excellent substrate in the elimination of methylene blue, which is promising in the development of environment-friendly water purifying materials. [ABSTRACT FROM AUTHOR]

[Display omitted] • Collagen/carboxylated CNF composite aerogels are successfully fabricated. • CDs can promote the in vitro self-assembly behavior of collagen. • CDs are beneficial for improving the properties of the collagen composite aerogels. • Composite aerogels have an excellent pH-responsive for drug delivery system. pH-responsive materials have great potential for use in various advanced fields, such as microreactors and drug delivery. This work proposes a promising strategy for preparing composite aerogels with pH-responsive properties based on collagen (COL) and TEMPO-oxidized cellulose nanofibers (CNFs) through the self-assembly behavior of COL molecules for controlled-drug release. COL fibrils and carboxylated CNFs (cCNFs) exhibited a high-density, physical cross-linked supramolecular double network structure. Specifically, cyclodextrins (CDs) were introduced to optimize the structural stability and slow-release capability of the composite aerogels. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and thermogravimetric analyses were used to characterize the structure of the aerogels, and the swelling behavior and water contact angle of the aerogels were evaluated. Using 5-fluorouracil (5-FU) as the model drug, the slow-release mechanism was subsequently revealed. Compared with the COL aerogels and COL/cCNF composite aerogels, the COL/cCNF@CD composite aerogels exhibited enhanced structural stability and slow-release performance through the synergistic enhancement effect of cCNFs and CDs. The aerogels also exhibited sensitivity to pH for regulating 5-FU release, and the COL composite aerogels with CDs and cCNFs maintained excellent cytocompatibility. In conclusion, CDs had a positive effect on the structural stability and pH-responsiveness of the composite aerogels and promoted the possible utilization of aerogels in drug delivery systems. [ABSTRACT FROM AUTHOR]