Coatings
·
2022
·Vol. 12
·期 11
·1734
·
IF 3.236
Jiaxin Zhao,Xiaoxiao Wu,Xushuo Yuan,Xinjie Yang,Haiyang Guo,Wentao Yao,Decai Ji,Xiaoping Li,Lianpeng Zhang
Cellulose is one of the most abundant, widely distributed and abundant polysaccharides on earth, and is the most valuable natural renewable resource for human beings. In this study, three different particle sizes (250, 178, and 150 μm) of Neosinocalamus affinis cellulose were extracted from Neosinocalamus affinis powder using bio-enzyme digestion and prepared into nanocellulose (CNMs). The cellulose contents of 250, 178, and 150 μm particle sizes were 53.44%, 63.38%, and 74.08%, respectively; the crystallinity was 54.21%, 56.03% and 63.58%, respectively. The thermal stability of cellulose increased gradually with smaller particle sizes. The yields of CNMs for 250, 178, and 150 μm particle sizes were 14.27%, 15.44%, and 16.38%, respectively. The results showed that the Neosinocalamus affinis powder was successfully removed from lignin, hemicellulose, and impurities (pectin, resin, etc.) by the treatment of bio-enzyme A (ligninase:hemicellulose:pectinase = 1:1:1) combined with NH3·H2O and H2O2/CH3COOH. Extraction of cellulose from Neosinocalamus affinis using bio-enzyme A, the smaller the particle size of Neosinocalamus affinis powder, the more cellulose content extracted, the higher the crystallinity, the better the thermal stability, and the higher the purity. Subsequently, nanocellulose (CNMs) were prepared by using bio-enzyme B (cellulase:pectinase = 1:1). The CNMs prepared by bio-enzyme B showed a network structure and fibrous bundle shape. Therefore, the ones prepared in this study belong to cellulose nanofibrils (CNFs). This study provides a reference in the extraction of cellulose from bamboo using bio-enzymes and the preparation of nanocellulose. To a certain extent, the utilization of bamboo as a biomass material was improved.Keywords:Neosinocalamus affinis;cellulose;nanocellulose;bio-enzymes;particle size
研究领域:
材料科学
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生物化学
·
生物材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Zhuang He,Yingnan He,Fengqin Chang,Zaixing Li,Jianrui Niu,Meng Li,Shusheng Zhang,Xiaohua Li,Rongguang Shi,Guangzhi Hu
Considering the complexity of traditional cobalt phosphide (Co 2 P) loaded biochar synthesis research on a simple and efficient synthesis method has practical significance. In this study, after phosphoric acid activation, Neosinocalamus affinis biochar (NAB) and nanoplate Co 3 O 4 quickly formed a Co 2 P-NAB composite material with high Co 2 P crystallinity and was uniformly dispersed on the surface of NAB in a microwave reactor. Co 2 P-NAB has an excellent catalytic degradation effect in the activation of peroxymonosulfate (PMS) to degrade tetracycline (TC). The optimal TC degradation efficiency was achieved with the addition of 50 mg L −1 TC concentration, 0.2 g L −1 catalysts, 0.406 mM PMS and pH = 6.02. In addition, according to the pseudo-first-order reaction rate constant calculation, the composite of Co 2 P-NAB and PMS the synergy efficiency is 81.55 %. Compared with Co 2 P-NAB (10.83 %) and PMS (7.62 %) alone, the Co 2 P-NAB/PMS system has a significant promotion effect on the degradation of TC molecules. Additionally, the Co 2 P-NAB/PMS system had a TC mineralization rate of 68 % in 30 min. Furthermore, after a series of characterization, detection and analysis, and influencing factor experiments, we proposed a potential mechanism for the Co 2 P–NAB/PMS reaction system to degrade TC and found that singlet oxygen ( 1 O 2 ) plays an essential role in the non-radical degradation process. Finally, according to the liquid chromatography-mass spectrometry (LC-MS) detection of TC degradation intermediates, a possible degradation route was proposed. Therefore, this work uses microwave technology to present a novel and simple synthesis method for transition metal phosphides, which provides potential application value for the treatment of actual wastewater with heterogeneous catalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）