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首页> 外文期刊>Journal of nano research >Preparation and Characterization of Cellulose Crystallites via Fe(III)-, Co(II)- and Ni(II)-assisted Dilute Sulfuric Acid Catalyzed Hydrolysis Process
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Preparation and Characterization of Cellulose Crystallites via Fe(III)-, Co(II)- and Ni(II)-assisted Dilute Sulfuric Acid Catalyzed Hydrolysis Process

机译：Fe（III）-，Co（II）-和Ni（II）辅助的稀硫酸催化水解法制备和表征纤维素微晶

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摘要

Hydrolyzing the cellulose amorphous regions with high selectivity while protecting the crystallite phases unaltered during acid hydrolysis is still a great challenge in nanocellulose industry. Due to this reason, transition metal based catalysts such as Fe(NO3)(3-), Co(NO3)(2-) and Ni(NO3)(2)- metal salts were chosen as promoter to co-catalyze with H2SO4 in order to develop a facile hydrolysis technique for the preparation of cellulose crystallites inform nano-dimension from native cellulose source. This study investigated the hydrolysis efficiency of three different transition metals (Fe3+, Co2+ and Ni2+) on cellulose crystallinity index, structure and morphology of the products. Results showed that the transition metal salts (Ni2+, Co2+ and Fe3+) were capable to selectively degraded cellulose amorphous structure with increase of crystallite sizes (8.12-27.8 nm) and improved of crystallinity index (65.5-70.3 %), as compared to native cellulose. Furthermore, surface morphology study indicated the cellulose fibers were successfully disintegrated into smaller fragments (diameter ranges of 18.5-31.5 nm) with spider-web-like nanostructured surfaces. Higher oxidation state of Fe(III)-cation with trivalent state rendered more effective hydrolysis effect in preparing the cellulose crystallites as compared to divalent state of Co(II)-and Ni(II)-cations.
机译：在纳米纤维素工业中，在高选择性地水解纤维素无定形区域的同时保护酸水解期间不变的微晶相仍然是巨大的挑战。由于这个原因，选择了基于过渡金属的催化剂，例如Fe（NO3）（3-），Co（NO3）（2-）和Ni（NO3）（2）-金属盐作为助催化剂，与H2SO4共催化。为了开发一种方便的水解技术来制备纤维素微晶，需要从天然纤维素来源获得纳米级的信息。这项研究研究了三种不同过渡金属（Fe3 +，Co2 +和Ni2 +）对纤维素结晶度，产物结构和形态的水解效率。结果表明，与天然纤维素相比，过渡金属盐（Ni2 +，Co2 +和Fe3 +）能够随着微晶尺寸（8.12-27.8 nm）的增加而选择性地降解纤维素无定形结构，并提高结晶度指数（65.5-70.3％）。 。此外，表面形态学研究表明，纤维素纤维已成功分解成具有蜘蛛网状纳米结构表面的较小碎片（直径范围为18.5-31.5 nm）。与Co（II）-和Ni（II）-阳离子的二价态相比，具有三价态的Fe（III）-阳离子的更高氧化态在制备纤维素微晶方面具有更有效的水解效果。

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