Person:
Sánchez Salvador, José Luis

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First Name
José Luis
Last Name
Sánchez Salvador
URI
https://hdl.handle.net/20.500.14352/86273
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Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Ingeniería Química y de Materiales
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Author: Negro Álvarez, Carlos Manuel × Subject: 66 ×

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    Cellulose nanofibers and chitosan to remove flexographic inks from wastewaters
    (Water research and technology, 2019) Balea Martín, Ana; Monte Lara, María Concepción; Fuente González, Elena De La; Negro Álvarez, Carlos Manuel; Sánchez Salvador, José Luis; Blanco Suárez, María Ángeles
    Flexographic printing technology is an economical, productive, low maintenance and versatile technology. However, the removal of these inks by the traditional flotation process during paper recycling is not possible since they remain dissolved in the waters, making necessary the development of alternative methods. Recent studies have revealed the potential use of nanocellulose (NC) combined with a cationic polyacrylamide to remove flexographic inks from wastewater. The use of a natural polymer, such as chitosan, would be an important improvement of this treatment because NC and chitosan are the two most abundant natural polymers with interesting properties, such as non-toxicity and biodegradability. Therefore, in this study the decolorization of three flexographic inks (copper phthalocyanine blue, carbon black and diarylide yellow) by the sequential addition of cellulose nanofibers, produced from recycled paper, and chitosan has been evaluated. Results show that this eco-friendly approach has high potential for the removal of water-based inks with an almost 100% reduction of turbidity and ink from the wastewater. Moreover, the final sludge containing nanocellulose and inks could be used to reinforce the pulp of the middle layers of carton board, improving the mechanical properties of the product and reducing waste generation.
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    Fit-for-use nanofibrillated cellulose from recovered paper
    (Nanomaterials, 2023) Balea Martín, Ana; Monte Lara, María Concepción; Fuente González, Elena De La; Sánchez Salvador, José Luis; Tarrés, Quim; Mutjé, Pere; Delgado-Aguilar, Marc; Negro Álvarez, Carlos Manuel
    The cost-effective implementation of nanofibrillated cellulose (CNF) at industrial scale requires optimizing the quality of the nanofibers according to their final application. Therefore, a portfolio of CNFs with different qualities is necessary, as well as further knowledge about how to obtain each of the main qualities. This paper presents the influence of various production techniques on the morphological characteristics and properties of CNFs produced from a mixture of recycled fibers. Five different pretreatments have been investigated: a mechanical pretreatment (PFI refining), two enzymatic hydrolysis strategies, and TEMPO-mediated oxidation under two different NaClO concentrations. For each pretreatment, five high-pressure homogenization (HPH) conditions have been considered. Our results show that the pretreatment determines the yield and the potential of HPH to enhance fibrillation and, therefore, the final CNF properties. These results enable one to select the most effective production method with the highest yield of produced CNFs from recovered paper for the desired CNF quality in diverse applications.