Open AccessInfluence of calcium chloride impregnation on the thermal and high-temperature carbonization properties of bamboo fiber
Author(s) -
Dali Cheng,
Tao Li,
Gregory D. Smith,
Jing Yang,
HuiMing Cheng,
Zhenyue Miao,
Zicheng Wu
Publication year - 2019
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0212886
Subject(s) - thermogravimetric analysis , carbonization , materials science , fiber , bamboo , char , chemical engineering , fourier transform infrared spectroscopy , cellulose , pyrolysis , thermal decomposition , cellulose fiber , scanning electron microscope , composite material , nuclear chemistry , chemistry , organic chemistry , engineering
In this study, bamboo fiber was pretreated with calcium chloride (CaCl 2 ) solution by using an ultrasonic method, and then heat-treated at 250°C and carbonized at 1000°C. The effect of impregnation with CaCl 2 on the thermal and chemical properties and morphology of bamboo fiber was determined using thermogravimetric and differential thermogravimetric analyses, in situ Fourier transform infrared spectroscopy, and scanning electron microscopy. The pore structure of the carbonized bamboo fiber was investigated. The results revealed that bamboo fiber pretreated with 5% CaCl 2 (BFCa 5 ) showed a downward shift in the temperature of the maximum rate of weight loss253°C and increase in char residue to 31.89%. BFCa 5 was expected to undergo dehydration under the combined effect of oxygen-rich atmosphere and CaCl 2 catalysis from 210°C, and cellulose decomposition would be remarkable at 250°C. Pretreatment with 5% CaCl 2 promoted the formation of porous structure of the carbonized fiber, which exhibited a typical Type-IV isotherm, with the Brunauer–Emmett–Teller specific surface area of 331.32 m 2 /g and Barrett–Joyner–Halenda adsorption average pore diameter of 13.6440 nm. Thus, CaCl 2 was found to be an effective catalyst for the pyrolysis of bamboo fiber, facilitating the formation of porous carbonized fiber.