Facile preparation of porous carbons from rice husk by microwave heating for supercapacitors

Abstract This study aimed to produce xylooligosaccharide (XOS) and arabino-xylooligosaccharide (AXOS) from rice husk (RH) using microwave treatment combined with enzymatic hydrolysis and evaluate their prebiotic properties. The RH was pretreated by a microwave heating process at 140, 160 and 180°C for 5, 10, and 15 min to obtain crude arabinoxylan (AX). The results emphasized that increasing microwave pretreatment time increased sugar content. The crude AX was then extracted with 2% (w/v) sodium hydroxide at 25°C for 24 h. The obtained AX was then used as a substrate for XOS production by commercial xylanases. The results showed that the oligosaccharide produced by Pentopan Mono BG and Ultraflo Max provided xylobiose and xylotriose as the main products. Interestingly, AXOS was also present in the oligosaccharide product. Furthermore, the oligosaccharides obtained were able to promote the growth of Lactobacillus spp. and to resist degradation more than 70% after exposure to simulated human digestion.

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Rapid carbothermal synthesis of nanostructured silicon carbide particles and whiskers from rice husk by microwave heating method

Advanced Powder Technology ◽

10.1016/j.apt.2013.02.003 ◽

2013 ◽

Vol 24 (5) ◽

pp. 838-843 ◽

Cited By ~ 37

Author(s):

Jin Li ◽

Takashi Shirai ◽

Masayoshi Fuji

Keyword(s):

Silicon Carbide ◽

Microwave Heating ◽

Rice Husk ◽

Heating Method ◽

Nanostructured Silicon ◽

Carbothermal Synthesis ◽

Silicon Carbide Particles ◽

Carbide Particles

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Facile preparation of hierarchical porous carbons for supercapacitors by direct carbonization of potassium humate

Journal of Solid State Electrochemistry ◽

10.1007/s10008-016-3360-y ◽

2016 ◽

Vol 21 (1) ◽

pp. 263-271 ◽

Cited By ~ 11

Author(s):

Baolin Xing ◽

Guangxu Huang ◽

Zhengfei Chen ◽

Lunjian Chen ◽

Guiyun Yi ◽

...

Keyword(s):

Porous Carbons ◽

Potassium Humate ◽

Hierarchical Porous ◽

Hierarchical Porous Carbons ◽

Facile Preparation

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Controlling hierarchical porous structures of rice-husk-derived carbons for improved capacitive deionization performance

Environmental Science Nano ◽

10.1039/c8en01181h ◽

2019 ◽

Vol 6 (3) ◽

pp. 916-924 ◽

Cited By ~ 9

Author(s):

Jiyoung Kim ◽

Yilhoon Yi ◽

Dong-Hyun Peck ◽

Seong-Ho Yoon ◽

Doo-Hwan Jung ◽

...

Keyword(s):

Rice Husk ◽

Electrode Material ◽

Capacitive Deionization ◽

Porous Structures ◽

Post Processing ◽

Porous Carbons ◽

Processing Methods ◽

Hierarchical Porous ◽

Hierarchical Porous Carbons

We report on hierarchical porous carbons derived from rice husk (RH) through the combination of carbonization and two post-processing methods that were used as the electrode material for capacitive deionization (CDI).

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Facile Preparation of Novel Hierarchically Porous Carbon at the Molecular Level for Supercapacitor Electrode Application

NANO ◽

10.1142/s1793292018500911 ◽

2018 ◽

Vol 13 (08) ◽

pp. 1850091 ◽

Cited By ~ 1

Author(s):

Kai Li ◽

Wei-Bin Zhang ◽

Zhi-Yun Zhao ◽

Yue Zhao ◽

Xi-Wen Chen ◽

...

Keyword(s):

Molecular Weight ◽

Current Density ◽

Diblock Copolymer ◽

Molecular Level ◽

Rate Performance ◽

Porous Carbons ◽

Supercapacitor Electrode ◽

Hierarchically Porous ◽

Facile Preparation ◽

Superior Cycling Stability

Hierarchically porous carbons are obtained by a facile process of carbonizing the precursor of diblock copolymer xPS-[Formula: see text]-polymethylmethacrylate (PMMA). In the diblock copolymer, there is a carbon source of cross-linked polystyrene (xPS) and a sacrificial block of PMMA. The atom transfer radical polymerization was used to synthesize the diblock copolymer with controlled molecular weight and narrow polydispersity in dimethylformamide at 120∘C. The obtained hierarchically porous carbons (HPCs) exhibit remarkable electrochemical properties, such as higher specific capacitance of 204[Formula: see text]F[Formula: see text]g[Formula: see text] at the current density of 0.5[Formula: see text]A[Formula: see text]g[Formula: see text] in 6[Formula: see text]mol[Formula: see text]L[Formula: see text] aqueous KOH electrolyte. In addition, it also presents an excellent rate performance of 64% capacitance retention as the current density increases to 10[Formula: see text]A[Formula: see text]g[Formula: see text] and a superior cycling stability of 98% capacitance retention after 5000 cycles at the current density of 1[Formula: see text]A[Formula: see text]g[Formula: see text].

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