Preparation of high oil absorption microfiber cryogels by mechanical method
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Preparation of high oil absorption microfiber cryogels by mechanical method Haonan Zhang1 · Lulu Zhu1 · Shiwen Xue1 · Jin Zhao1 · Hao Ren1 · Huamin Zhai1 Received: 6 February 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Poplar alkaline peroxide mechanical pulp (APMP) was used as plant fiber raw material, and it was graded according to the lignin content. The graded raw materials were used to prepare lignin-containing microfibers (LCMFs) by micro-grinding, and then, the lignin-containing microfiber cryogels (LCMF-cryogels) were prepared by vacuum freeze-drying. The particle size distribution, micromorphology and dispersion stability of LCMFs were characterized by laser diffraction particle size analyzer, transmission electron microscopy and Zeta potentiometer. Then, the crystalline structure, pore structure, surface morphology and adsorption properties of LCMF-cryogels were analyzed. In addition, LCMF-cryogels were compared with the microfiber cryogels (MF-cryogels) which use commercial eucalyptus chemical bleaching pulp as raw material. It was proved that using poplar APMP as raw material to prepare cryogels is more advantageous. The results showed that the lower the lignin content in plant materials, the better the oil adsorption ability of cryogels. This is because the binding effect of lignin on the fiber is reduced, which makes the fibrillation of the fiber easier by external mechanical action. The maximum adsorption capacity of LCMF-cryogel for methyl silicone oil is 215 g/g, while that of MFcryogel prepared from commercial eucalyptus chemical bleaching pulp is 102.5 g/g. The analysis of the properties of raw fiber and the gel pores shows that the change in the fiber morphology caused by different pulping methods has important influence on the development of LCMF-cryogels by mechanical refining. Poplar APMP is more suitable for preparing fiber-based cryogels oil-absorbing materials than commercial eucalyptus chemical bleaching pulp.
* Hao Ren [email protected] 1
Jiangsu Co‑Innovation Center for Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, Jiangsu Province, China
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Wood Science and Technology
Introduction In recent years, more and more oil products have appeared in our lives. Oil pollution has become a serious global environmental problem, and the leakage of oil products in the process of transportation and exploitation is a great waste of precious natural resources (Gupta et al. 2017; Chen and Xu 2013). At present, oil pollution has become an urgent problem. Up until now, the methods to solve the problem of oil leakage pollution are mechanical treatment, physical treatment, chemical treatment and biological treatment. Among them, adsorbent is considered to be the most ideal treatment method for oil adsorption because of its relatively low technical cost, high efficiency and the reduction in secondary pollution. At presen
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