Mechanism and kinetics studies of carboxyl group formation on the surface of cellulose fiber in a TEMPO-mediated system

Sang, Xiankui; Qin, Chengrong; Tong, Zhangfa; Kong, Song; Jia, Zhuan; Wan, Guangcong; Liu, Xinliang

doi:10.1007/s10570-017-1279-9

Cited by 53 publications

(28 citation statements)

References 49 publications

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“…It is usually carried out in the condition of alkaline medium [ 36 ]. The mechanism of oxidizing C6 primary hydroxyl of cellulose using TEMPO/NaBr/NaClO system is shown in Figure 2 [ 37 ]. Unlike the TEMPO system, periodate only oxidizes the secondary hydroxyl groups of cellulose, breaking the chemical bond between C2 and C3, then forming two aldehyde groups.…”

Section: Nanocellulose Filtration Membranementioning

confidence: 99%

“… ( a ) Schematic diagram of hydrogel prepared by dissolving and cross-linking cellulose; ( b ) chemical equation of cellulose cross-linking reaction in NaOH/urea aqueous medium; ( c ) photo of hydrogel after washing of cross-linked cellulose; ( d ) the image on the left is an aqueous dispersion of chopped cellulose hydrogel, and ( e ) the image on the right is a distilled water dilution chart of the cellulose solution [ 37 ]. …”

Section: Figurementioning

confidence: 99%

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Nanocellulose Based Filtration Membrane in Industrial Waste Water Treatment: A Review

Liu

Shen

2021

Materials

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In the field of industrial wastewater treatment, membrane separation technology, as an emerging separation technology, compared with traditional separation technology such as precipitation, adsorption, and ion exchange, has advantages in separation efficiency, low energy consumption, low cost, simple operation, and no secondary pollution. The application has been expanding in recent years, but membrane fouling and other problems have seriously restricted the development of membrane technology. Natural cellulose is one of the most abundant resources in nature. In addition, nanocellulose has characteristics of high strength and specific surface area, surface activity groups, as well as being pollution-free and renewable, giving it a very wide development prospect in many fields, including membrane separation technology. This paper reviews the current status of nanocellulose filtration membrane, combs the widespread types of nanocellulose and its derivatives, and summarizes the current application of cellulose in membrane separation. In addition, for the purpose of nanocellulose filtration membrane in wastewater treatment, nanocellulose membranes are divided into two categories according to the role in filtration membrane: the application of nanocellulose as membrane matrix material and as a modified additive in composite membrane in wastewater treatment. Finally, the advantages and disadvantages of inorganic ceramic filtrations and nanocellulose filtrations are compared, and the application trend of nanocellulose in the filtration membrane direction is summarized and discussed.

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Section: Nanocellulose Filtration Membranementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Nanocellulose Based Filtration Membrane in Industrial Waste Water Treatment: A Review

Liu

Shen

2021

Materials

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“…Regarding the length of the lignocellulose nanofibers, a generalized decreased is observed after catalytic oxidation, showing a decrease of 60.07%, 55.94%, and 53.60% for the LCNF obtained from eggplant, pepper, and tomato plants. It is produced by the depolymerization and β-elimination of the cellulose amorphous regions into gluconic acid or cellulose-derived small fragments [32]. Figure 4 shows the effect of the different pretreatments on the crystallinity of the lignocellulose nanofibers.…”

Section: Lignocellulose Nanofiber Characterizationmentioning

confidence: 99%

“…Both pretreatments present similar values for the different lignocellulose nanofibers (56%-60%), all higher than the initial values shown in the cellulose pulps. This may be due to the degradation of the amorphous regions by the action of both pretreatments, maintaining the crystalline regions of cellulose and increasing the crystallinity index of the samples [32]. The thermal stability of the cellulose nanofibers is also an important parameter to study their suitability in their final application.…”

Section: Lignocellulose Nanofiber Characterizationmentioning

confidence: 99%

Horticultural Plant Residues as New Source for Lignocellulose Nanofibers Isolation: Application on the Recycling Paperboard Process

et al. 2020

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Horticultural plant residues (tomato, pepper, and eggplant) were identified as new sources for lignocellulose nanofibers (LCNF). Cellulosic pulp was obtained from the different plant residues using an environmentally friendly process, energy-sustainable, simple, and with low-chemical reagent consumption. The chemical composition of the obtained pulps was analyzed in order to study its influence in the nanofibrillation process. Cellulosic fibers were subjected to two different pretreatments, mechanical and TEMPO(2,2,6,6-Tetramethyl-piperidin-1-oxyl)-mediated oxidation, followed by high-pressure homogenization to produce different lignocellulose nanofibers. Then, LCNF were deeply characterized in terms of nanofibrillation yield, cationic demand, carboxyl content, morphology, crystallinity, and thermal stability. The suitability of each raw material to produce lignocellulose nanofibers was analyzed from the point of view of each pretreatment. TEMPO-mediated oxidation was identified as a more effective pretreatment to produce LCNF, however, it produces a decrease in the thermal stability of the LCNF. The different LCNF were added as reinforcing agent on recycled paperboard and compared with the improving produced by the industrial mechanical beating. The analysis of the papersheets’ mechanical properties shows that the addition of LCNF as a reinforcing agent in the paperboard recycling process is a viable alternative to mechanical beating, achieving greater reinforcing effect and increasing the products’ life cycles.

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“…Previous study showed that the introduction of carboxyl groups to cellulose generates a significant increase in the adsorption capacity of copper, cadmium and lead ions [ 68 ]. Moreover, the electrostatic repulsions that occur among negatively charged carboxylate ions allow a homogenous dispersion of individual cellulose fibers in water [ 69 ]. A method for fabricating carboxyl modified bacterial cellulose consists in 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) mediated oxidation that leads to the replacement of primary hydroxyl groups of cellulose with carboxyl groups [ 70 ].…”

Section: Antibacterial Nanocellulose-metal Oxides Hybridsmentioning

confidence: 99%

Nanocellulose Hybrids with Metal Oxides Nanoparticles for Biomedical Applications

Oprea

Panaitescu

2020

Molecules

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Cellulose is one of the most affordable, sustainable and renewable resources, and has attracted much attention especially in the form of nanocellulose. Bacterial cellulose, cellulose nanocrystals or nanofibers may serve as a polymer support to enhance the effectiveness of metal nanoparticles. The resultant hybrids are valuable materials for biomedical applications due to the novel optical, electronic, magnetic and antibacterial properties. In the present review, the preparation methods, properties and application of nanocellulose hybrids with different metal oxides nanoparticles such as zinc oxide, titanium dioxide, copper oxide, magnesium oxide or magnetite are thoroughly discussed. Nanocellulose-metal oxides antibacterial formulations are preferred to antibiotics due to the lack of microbial resistance, which is the main cause for the antibiotics failure to cure infections. Metal oxide nanoparticles may be separately synthesized and added to nanocellulose (ex situ processes) or they can be synthesized using nanocellulose as a template (in situ processes). In the latter case, the precursor is trapped inside the nanocellulose network and then reduced to the metal oxide. The influence of the synthesis methods and conditions on the thermal and mechanical properties, along with the bactericidal and cytotoxicity responses of nanocellulose-metal oxides hybrids were mainly analyzed in this review. The current status of research in the field and future perspectives were also signaled.

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Mechanism and kinetics studies of carboxyl group formation on the surface of cellulose fiber in a TEMPO-mediated system

Cited by 53 publications

References 49 publications

Nanocellulose Based Filtration Membrane in Industrial Waste Water Treatment: A Review

Nanocellulose Based Filtration Membrane in Industrial Waste Water Treatment: A Review

Horticultural Plant Residues as New Source for Lignocellulose Nanofibers Isolation: Application on the Recycling Paperboard Process

Nanocellulose Hybrids with Metal Oxides Nanoparticles for Biomedical Applications

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