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Contributions of ultrasonic wave, metal ions, and oxidation on the depolymerization of cellulose and its kinetics

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  • Li, Hengxiang
  • Zhang, Kang
  • Zhang, Xiaohua
  • Cao, Qing
  • Jin, Li'e

Abstract

Contributions of ultrasonic wave, metal ions and oxidation on the degree of polymerization (DP) of microcrystalline cellulose (MCC) were evaluated. Five transition metal ions, namely, Ni2+, Cu2+, Co2+, Mn2+, and Fe2+, were selected. H2O2, as an oxidizing agent, was also investigated. Changes in the structure of MCC induced by the ions were characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, and field-emission scanning electron microscopy. Results indicated that DP decreased by 16.6%, 32.8%, 47.9% using U-MCC, Ni2+/U-MCC, and ONi2+/U-MCC, respectively. DP of MCC was reduced from 195 to 101.5 under ONi2+/U-MCC due to the destruction of interchain-hydrogen bond. Kinetic of depolymerization process for MCC obeyed the equation: DP = 102.2 + 93.8e−0.000798t, with activation energy of 17.33 kJ/mol. The result suggests that depolymerization of MCC was mainly a physical process at these conditions, and the interchain-hydrogen bond were disrupted. This study is beneficial for the deep hydrolysis and its utilization of MCC.

Suggested Citation

  • Li, Hengxiang & Zhang, Kang & Zhang, Xiaohua & Cao, Qing & Jin, Li'e, 2018. "Contributions of ultrasonic wave, metal ions, and oxidation on the depolymerization of cellulose and its kinetics," Renewable Energy, Elsevier, vol. 126(C), pages 699-707.
    • Handle: RePEc:eee:renene:v:126:y:2018:i:c:p:699-707
    DOI: 10.1016/j.renene.2018.03.079
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    1. Ghosh, Shiladitya & Chowdhury, Ranjana & Bhattacharya, Pinaki, 2017. "Sustainability of cereal straws for the fermentative production of second generation biofuels: A review of the efficiency and economics of biochemical pretreatment processes," Applied Energy, Elsevier, vol. 198(C), pages 284-298.
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