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Preparation of Microfibrillated Cellulose through Catalyst Preloaded Fenton Oxidation
Received:September 19, 2019  
DOI：10.11980/j.issn.0254-508X.2020.01.002
Key Words:catalyst preloaded  Fenton oxidation  oxidation efficiency  microfibrillated cellulose
Fund Project:国家自然科学基金面上项目 31971610 国家自然科学基金面上项目（31971610）。
Author NameAffiliation
DUAN Linjuan Tianjin Key Lab of Pulp &
Paper，Tianjin University of Science &
Technology，Tianjin，300457
Yuncheng Polytechnic College,Yuncheng,Shanxi Province,044300 
DUAN Yan Tianjin Key Lab of Pulp &
Paper，Tianjin University of Science &
Technology，Tianjin，300457 
MA Wei Tianjin Key Lab of Pulp &
Paper，Tianjin University of Science &
Technology，Tianjin，300457 
LI Qun Tianjin Key Lab of Pulp &
Paper，Tianjin University of Science &
Technology，Tianjin，300457 
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Abstract:Microfibrillated cellulose(MFC)was successfully prepared from dissolving pulp by catalyst preloaded Fenton oxidation following by high-pressure homogenization. The effects of various parameters such as the hydrogen peroxide dosage，ferrous catalyst dosage，reaction temperature and time on Fenton oxidation efficiency were discussed. Accordingly，the characterizations were carried out to investigate the microstructure and chemical structure changes of the oxidized fibers，and the morphology，crystallinity and thermal stability of MFC. The results showed that the catalyst preloaded Fenton oxidation method could significantly increase the content of carboxyl and aldehyde groups in oxidized fibers，and reduce the degree of polymerization and Zeta potential, which was beneficial to increase the electrostatic repulsion between the fibers，facilitating the subsequent homogenization treatment. Under the reaction conditions of 25% pulp consistency，H2O2 0.15 g/g ，FeSO4•7H2O 1.5 g，pH value 3，45℃ and 120 min， the contents of carboxyl group and aldehyde group in the oxidized fibers were 85.43 μmol/g and 57.32 μmol/g respectively，the degree of polymerization was 154，and the Zeta potential was -34.72 mV. The Fourier transform infrared spectroscopy(FT-IR）indicated that the Fenton oxidized fibers were successfully prepared. The characterizations by scanning electron microscope(SEM），X-ray diffractometer(XRD）and thermogravimetric analyzer(TG）showed that the obtained MFC were uniform in size of about 200 nm in diameter，the crystallinity was 81.35%，while the thermal stability was slightly reduced.
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