Characterization of Wood Derived Hierarchical Cellulose Scaffolds for Multifunctional Applications

Segmehl, Jana S.; Studer, Vanessa; Keplinger, Tobias; Burgert, Ingo

doi:10.3390/ma11040517

Cited by 29 publications

(24 citation statements)

References 29 publications

(36 reference statements)

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“…Furthermore, P25 nanoparticles dispersed in aqueous solutions were coated on the surface of N-wood, Half B-wood, and B-wood to obtain P25 nanoparticles supported on the N-wood (NP-wood), Half B-wood (HBP-wood ), and B-wood (BP-wood), respectively. As shown in Figure 1e, Raman spectra revealed that peak intensity of B-wood at 1300, 1602, and 1730 cm −1 decreased compared with that of N-wood, which further demonstrated the removal of most of the lignin in B-wood [37]. Moreover, the degradation of the cellulose was negligible, while both lignin and hemicellulose were dramatically removed, as shown in our previous work [38].…”

Section: Resultssupporting

confidence: 74%

Bleached Wood Supports for Floatable, Recyclable, and Efficient Three Dimensional Photocatalyst

Guo

et al. 2019

Catalysts

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To suppress the agglomeration of a photocatalyst, facilitate its recovery, and avoid photolysis of dyes, various support materials such as ceramic, carbon, and polymer have been investigated. However, these support materials pose the following additional challenges: ceramic supports will settle down at the bottom of their container due to their high density, while the carbon support will absorb the UV-vis light for its black color. Herein, we propose a floatable, UV transmitting, mesoporous bleached wood with most lignin removal to support P25 nanoparticles (BP-wood) that can effectively, recyclable, three dimensional (3D) photocatalytic degrade dyes such as methylene blue (MB) under ambient sunlight. The BP-wood has the following advantages: (1) The delignification makes the BP-wood more porous to not only quickly transport MB solutions upstream to the top surface, but is also decorated with P25 nanoparticles on the cell wall to form a 3D photocatalyst. (2) The delignification endows the BP-wood with good UV transmittance to undergo 3D photocatalytic degradation under sunlight. (3) It can float on the surface of the MB solution to capture more sunlight to enhance the photodegradation efficiency by suppressing the photolysis of MB. (4) It has comparable or even better photocatalytic degradation of 40 mg/L and 60 mg/L MB than that of P25 nanoparticles suspension. (5) It is green, recyclable, and scalable.

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Section: Resultssupporting

confidence: 74%

Bleached Wood Supports for Floatable, Recyclable, and Efficient Three Dimensional Photocatalyst

Guo

et al. 2019

Catalysts

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“…Structural changes of the cellulosic scaffold under these reaction conditions (hydrogen peroxide and acidic environment) have not been studied in this paper. However, no significant structural changes are expected, as cellulose is supposed to be stable under these reaction conditions, according to literature …”

Section: Resultsmentioning

confidence: 99%

Nanoparticle‐Mediated Enzyme Immobilization on Cellulose Fibers: Reusable Biocatalytic Systems for Cascade Reactions

Goldhahn

Burgert

Chanana

2019

Adv Materials Inter

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Enzymatic biocatalysis has the potential to enable greener and more efficient synthesis routes for the chemical industry. However, enzymes are hard to remove and recover from the reaction solution due to the homogeneous nature of biocatalysis. Hence, enzymes are often limited to single‐use applications. This work shows the immobilization of enzymes based on nanoparticle‐mediated robust physisorption on natural cellulose fibers. The resulting hybrid material is able to perform heterogeneous biocatalysis. The catalytic activity and the multifold reusability of immobilized enzyme are exemplarily investigated for the enzyme laccase. The kinetic parameters of immobilized laccase are determined and compared to the ones of free laccase. Furthermore, relative activities are evaluated in dependence of pH and temperature, and compared to the ones of free enzyme. The heterogeneous biocatalyst is easy to handle and can be quickly and completely removed from the reaction solution due to its macroscopic nature. The potential of multifold reusability of the catalyst is shown for 20 cycles with remaining activities of 45% after 10 and 24% after 20 reaction cycles. The approach may allow for sophisticated enzymatic cascade reaction systems in a simple flow‐through device as exemplarily shown for the immobilized enzymes glucose oxidase and horseradish peroxidase.

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“…The delignification reaction was conducted according to a previously reported method [21]: samples were oven dried (65 °C) to determine their dry weight. Then, they were immersed in a solution of acetic acid and hydrogen peroxide 1:1 ( v / v ) for 8 h at 60 °C (“mild” conditions) or 4 h at 80 °C (“harsh” conditions); 10 replicates were used for each condition.…”

Section: Methodsmentioning

confidence: 99%

“…The objective was to increase the porosity of the material through acidic delignification and show how the pore size distribution is affected by this procedure and subsequent drying steps. The delignification follows a previously reported acidic delignification protocol, which was shown to be more efficient in removing lignin compared to a basic condition process [21]. As reported in previous studies, the selectivity of the delignification is not only based on the method used, but also on the initial chemical composition of the biomass [43].…”

Section: Introductionmentioning

confidence: 99%

“…The development of functional lignocellulosic materials usually requires a chemical modification addressing the wood cell wall biopolymers [17]. In this regard, several research groups came up with a new approach for bulk wood modification, based on the removal of lignin [1,3,12,14,16,20,21]. Originally developed for pulp and paper production to gain individual cellulose fibers [22,23], delignification processes are now reconsidered to remove lignin from wood while retaining its hierarchical structure and fiber directionality, opening up new avenues in materials engineering [21].…”

Section: Introductionmentioning

confidence: 99%

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Porosity and Pore Size Distribution of Native and Delignified Beech Wood Determined by Mercury Intrusion Porosimetry

et al. 2019

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The complex hierarchical structures of biological materials in combination with outstanding property profiles are great sources of inspiration for material scientists. Based on these characteristic features, the structure of wood has been increasingly exploited to fabricate novel hierarchical and functional materials. With delignification treatments, the density and chemistry of wood can be altered, resulting in hierarchical cellulose scaffolds with enhanced porosity for the fabrication of novel hybrid materials. In the present study, focusing on acidic delignification of beech wood and its influence on porosity, we report on a structural characterization and qualitative assessment of the cellulose scaffolds using mercury intrusion porosimetry (MIP). To account for the effect of water removal from the hygroscopic structure, different drying methods—e.g., standard oven and freeze-drying—were applied. While native beech wood is characterized by the presence of macro, meso and micro pores, delignification altered the porosity, increasing the importance of the macropores in the pore size distribution. Furthermore, we showed that the final porosity obtained in the material is strongly dependent on the applied drying process. Samples delignified under harsh conditions at high temperature (mass loss of ~35%) show a 13% higher porosity after freeze-drying compared to oven-dried samples. The obtained results contribute to a better understanding of the impact of the delignification and drying processes on the porosity of cellulose scaffolds, which is of high relevance for subsequent modification and functionalization treatments.

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Characterization of Wood Derived Hierarchical Cellulose Scaffolds for Multifunctional Applications

Cited by 29 publications

References 29 publications

Bleached Wood Supports for Floatable, Recyclable, and Efficient Three Dimensional Photocatalyst

Bleached Wood Supports for Floatable, Recyclable, and Efficient Three Dimensional Photocatalyst

Nanoparticle‐Mediated Enzyme Immobilization on Cellulose Fibers: Reusable Biocatalytic Systems for Cascade Reactions

Porosity and Pore Size Distribution of Native and Delignified Beech Wood Determined by Mercury Intrusion Porosimetry

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