A More Efficient Fenton Oxidation Method with High Shear Mixing for the Preparation of Cellulose Nanofibers,Starch

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A More Efficient Fenton Oxidation Method with High Shear Mixing for the Preparation of Cellulose Nanofibers
Starch ( IF 2.6 ) Pub Date : 2020-05-17 , DOI: 10.1002/star.201900259
Linjuan Duan ₁ , Rongrong Liu ₁ , Qun Li ₁

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A more efficient Fenton oxidation method with high shear mixing for the preparation of cellulose nanofiber (CNF) is investigated. The Fenton reaction is the reaction between Fe²⁺ and H₂O₂ to produce a series of free radicals that leads to oxidation of the cellulose. With the new technology, the Fe²⁺ is preloaded into the kraft pulp by a high shear refining method to realize in situ oxidation of cellulose fibers. It is found that the carbonyl content in the fibers using high shear mixing process is 149.79 μmol g⁻¹ when the dosage of hydrogen peroxide is 0.08 g/g (weight of dry fibers), compared to the 126.40 μmol g⁻¹ of fiber without high shearing when the dosage of hydrogen peroxide is 0.15 g/g, which indicates that the new Fe²⁺ pre‐loading process has higher oxidation efficiency with lower H₂O₂ consumption compared with traditional Fe²⁺ preloading process. The ¹³C NMR results show that the C₂, C_3, and C₆ hydroxyl groups are oxidized to aldehyde and carboxyl groups, which is beneficial to increase the electrostatic repulsion between fibers and facilitate the subsequent homogenization treatment. The obtained CNF is uniform in size and slightly lower in thermal stability.

中文翻译：

高剪切混合的高效Fenton氧化法制备纤维素纳米纤维

研究了一种高效的高剪切混合Fenton氧化方法，用于制备纤维素纳米纤维（CNF）。芬顿反应是Fe ²⁺和H ₂ O ₂之间产生一系列自由基的反应，该自由基导致纤维素氧化。利用新技术，通过高剪切精炼方法将Fe ²⁺预加载到牛皮纸浆中，以实现纤维素纤维的原位氧化。发现当过氧化氢的剂量为0.08g / g（干纤维的重量）时，使用高剪切混合工艺的纤维中的羰基含量为149.79μmolg ^-1，相比之下，126.40μmolg ^-1当过氧化氢的用量为0.15 g / g时，纤维没有高剪切力，这表明与传统的Fe ²⁺预加载工艺相比，新的Fe ²⁺预加载工艺具有更高的氧化效率和更低的H ₂ O ₂消耗。的^13个C NMR结果表明，在C ₂，C _3，和C ₆羟基被氧化成醛和羧基，这是有利的，以增加纤维之间的静电排斥作用，并促进随后的均质化处理。所获得的CNF尺寸均匀且热稳定性略低。

更新日期：2020-05-17

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