微晶纤维素
纤维素
结晶度
无定形固体
材料科学
水溶液
化学工程
粒径
聚合度
球磨机
再结晶(地质)
核化学
化学
高分子化学
聚合
有机化学
聚合物
复合材料
古生物学
工程类
生物
作者
Lan Lan,Huanhao Chen,Daniel Lee,Shaojun Xu,Nathan Skillen,Aleksander A. Tedstone,Peter K. J. Robertson,Arthur Garforth,Helen Daly,Christopher Hardacre,Xiaolei Fan
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2022-04-04
卷期号:10 (15): 4862-4871
被引量:22
标识
DOI:10.1021/acssuschemeng.1c07301
摘要
Photoreforming of cellulose is a promising route for sustainable H2 production. Herein, ball-milling (BM, with varied treatment times of 0.5-24 h) was employed to pretreat microcrystalline cellulose (MCC) to improve its activity in photoreforming over a Pt/TiO2 catalyst. It was found that BM treatment reduced the particle size, crystallinity index (CrI), and degree of polymerization (DP) of MCC significantly, as well as produced amorphous celluloses (with >2 h treatment time). Amorphous cellulose water-induced recrystallization to cellulose II (as evidenced by X-ray diffraction (XRD) and solid-state NMR analysis) was observed in aqueous media. Findings of the work showed that the BM treatment was a simple and effective pretreatment strategy to improve photoreforming of MCC for H2 production, mainly due to the decreased particle size and, specifically in aqueous media, the formation of the cellulose II phase from the recrystallization of amorphous cellulose, the extent of which correlates well with the activity in photoreforming.
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