title: Extraction and comparison of carboxylated cellulose nanocrystals from bleached sugarcane bagasse pulp using two different oxidation methods.
abstract: Two kinds of carboxylated cellulose nanocrystals (CCNs) were prepared by using ultrasonic assisted 2,2,6,6-tetramethylpiperidinyl-1-oxy radical (TEMPO) mediated oxidation and one-step ammonium persulfate (APS) oxidation, which were denoted as TEMPO-oxidized CCNs (TO-CCNs) and APS-oxidized CCNs (AO-CCNs), respectively. The effects of oxidant content on the yield, carboxyl content, degree of polymerization (DPv) and morphology of the oxidized celluloses in the two oxidation methods were studied. Furthermore, the chemical structure, crystallinity and thermal stability of TO-CCNs and AO-CCNs were evaluated and compared by Fourier transformed infrared spectra, X-ray diffraction and thermogravimetric analyses. The results showed that with increase of oxidant content in the two methods, the carboxyl groups on the surfaces of TO-CCNs and AO-CCNs were both improved. And a remarkable decline of the DPv of cellulose sample also appeared in the two oxidative treatments. In addition, AO-CCNs exhibited a higher crystallinity and an enhanced thermal stability compared with TO-CCNs.
authors.affiliation: Institute of Chemical Industry of Forest Products, CAF, Key and Open Lab of Forest Chemical Engineering, SFA, Nanjing 210042, China. Electronic address: kaitaozhang@hotmail.com.
authors.forename: Kaitao
authors.initials: K
authors.lastname: Zhang
authors.affiliation: Institute of Chemical Industry of Forest Products, CAF, Key and Open Lab of Forest Chemical Engineering, SFA, Nanjing 210042, China. Electronic address: 18795849092@163.com.
authors.forename: Peipei
authors.initials: P
authors.lastname: Sun
authors.affiliation: Institute of Chemical Industry of Forest Products, CAF, Key and Open Lab of Forest Chemical Engineering, SFA, Nanjing 210042, China; Research Institute of Forestry New Technology, CAF, Beijing 100091, China. Electronic address: liuheicifp@hotmail.com.
authors.forename: He
authors.initials: H
authors.lastname: Liu
authors.affiliation: Institute of Chemical Industry of Forest Products, CAF, Key and Open Lab of Forest Chemical Engineering, SFA, Nanjing 210042, China; Research Institute of Forestry New Technology, CAF, Beijing 100091, China. Electronic address: shangsb@hotmail.com.
authors.forename: Shibin
authors.initials: S
authors.lastname: Shang
authors.affiliation: Department of Chemistry and Biochemistry, University of Michigan-Flint, Flint, MI 48502, United States. Electronic address: jiesong@umflint.edu.
authors.forename: Jie
authors.initials: J
authors.lastname: Song
authors.affiliation: Institute of Chemical Industry of Forest Products, CAF, Key and Open Lab of Forest Chemical Engineering, SFA, Nanjing 210042, China; Research Institute of Forestry New Technology, CAF, Beijing 100091, China. Electronic address: wgdan@163.com.
authors.forename: Dan
authors.initials: D
authors.lastname: Wang
mesh_terms: D000645:Ammonium Sulfate / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D031786:Saccharum / Q000378:metabolism*; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: C031276:ammonium peroxydisulfate; D002482:Cellulose; C027433:bagasse; D000645:Ammonium Sulfate
keywords: Ammonium persulfate; Carboxylated cellulose nanocrystals; Extraction; Oxidation; TEMPO