A green steam-modified delignification method to prepare low-lignin delignified wood for thick, large highly transparent wood composites

Li, Huayang; Guo, Xiaola; He, Yuming; Zheng, Rikuan

doi:10.1557/jmr.2018.466

Cited by 62 publications

(48 citation statements)

References 23 publications

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“…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]. The color changed from yellow to white during delignification process, shown in Figure 1f.…”

Section: Resultssupporting

confidence: 76%

“…Natural basswood (N-wood) slices with size of π × 20 × 20 × 5 mm 3 were obtained by cutting along the direction perpendicular to the growth of wood. Half-B-wood and B-wood were obtained by H2O2 steam delignification of above-mentioned N-wood at 100 C for 1 and 4 h, respectively [38]. After rinsed with water, and ethanol for three times, they were dried at 50 C for 4 h. The photodegradation process of BP-wood consists of the following steps.…”

Section: Preparation Of N-wood and B-woodmentioning

confidence: 99%

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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: 76%

Section: Preparation Of N-wood and B-woodmentioning

confidence: 99%

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

Guo

et al. 2019

Catalysts

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“…2 It was observed that surface modification 1 and lamination 8 of delignified wood template lamellae can be used to tune light scattering/haze and also transmittance. Previous work focused mostly on either total transmittance at particular TW thicknesses, 2,10 or angular distribution of light transmitted through TW at various thicknesses. 19 A quantitative relationship between total transmittance and sample thickness, however, is rarely studied.…”

Section: Introductionmentioning

confidence: 99%

Thickness Dependence of Optical Transmittance of Transparent Wood: Chemical Modification Effects

Chen

Baitenov

et al. 2019

ACS Appl. Mater. Interfaces

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Transparent wood (TW) is an emerging optical material combining high optical transmittance and haze for structural applications. Unlike nonscattering absorbing media, the thickness dependence of light transmittance for TW is complicated because optical losses are also related to increased photon path length from multiple scattering. In the present study, starting from photon diffusion equation, it is found that the angle-integrated total light transmittance of TW has an exponentially decaying dependence on sample thickness. The expression reveals an attenuation coefficient which depends not only on the absorption coefficient but also on the diffusion coefficient. The total transmittance and thickness were measured for a range of TW samples, from both acetylated and nonacetylated balsa wood templates, and were fitted according to the derived relationship. The fitting gives a lower attenuation coefficient for the acetylated TW compared to the nonacetylated one. The lower attenuation coefficient for the acetylated TW is attributed to its lower scattering coefficient or correspondingly lower haze. The attenuation constant resulted from our model hence can serve as a singular material parameter that facilitates cross-comparison of different sample types, at even different thicknesses, when total optical transmittance is concerned. The model was verified with two other TWs (ash and birch) and is in general applicable to other scattering media.

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“…The lignin component in biomass can be removed through cooking/bleaching in NaOH/Na 2 SO 3 [53], NaClO 2 / glacial acetic acid [54], or H 2 O 2 /(acetic acid) steam [55]. Generally, the degree of delignification can be controlled by the processing time and temperature [56].…”

Section: Preparation Of Macroscopic Cellulose Productsmentioning

confidence: 99%

Naturally or artificially constructed nanocellulose architectures for epoxy composites: A review

Soomro

Huang

et al. 2020

Nanotechnology Reviews

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Applications of carbon fiber reinforced epoxy-based composites have been highly restricted due to their high cost in the manufacturing process. Cellulose, a cheap and abundant material from nature, shows excellent mechanical property and structural stability. It shows huge potentials in substituting carbon fiber/epoxy with cellulose/epoxy composites to fulfill the great demands for composites with good performance and a reasonable price. This paper first reviews works about the preparation and regulation of cellulose materials based on the very basic concepts of top-down and bottom-up. Then research about the interfacial regulation between cellulose and epoxy has been discussed in two broad classes of covalent and non-covalent modification. Finally, the enhancement effect of cellulose reinforcement has been discussed in two broad classes of dispersive reinforcement and continuous phase reinforcement. The latter can be further divided into three classes according to the dimension feature (1D, 2D, and 3D). The results show that the nanolization of cellulose is necessary for guaranteeing the strength of composites, while the formation of macroscopic and continuous structures can ensure Young’s modulus of composites.

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A green steam-modified delignification method to prepare low-lignin delignified wood for thick, large highly transparent wood composites

Abstract: Abstract

Cited by 62 publications

References 23 publications

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

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

Thickness Dependence of Optical Transmittance of Transparent Wood: Chemical Modification Effects

Naturally or artificially constructed nanocellulose architectures for epoxy composites: A review

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