Journal
CHEMOSPHERE
Volume 291, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.132976
Keywords
Biomass; Carbonized bacterial cellulose; Pyrolysis temperature; Cr(VI) adsorption
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Funding
- National Nat-ural Science Foundation of China [51873087, 51803092]
- Natural Sci-ence Foundation of the Jiangsu Higher Education Institutions of China [BK20180490]
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The study found that increasing pyrolysis temperature improved the properties and adsorption performance of carbonized bacterial cellulose, with the highest adsorption capacity reaching 250.0 mg/g. The adsorption mechanisms mainly involved electrostatic interaction, pi-pi interaction, and functional group complexation.
The effects of pyrolysis temperature on properties and adsorption performance of carbonized bacterial cellulose (CBC) produced from bacterial cellulose at 300, 400, 600 and 800 degrees C were investigated. As pyrolysis temperature increased, the BET surface area, C and ash contents of CBC increased while its mass yield and the contents of H, N and O decreased. Higher pyrolysis temperature resulted in CBC having more aromatic structure and less hydrophilic. The impacts of pyrolysis temperature, solution pH, contact time and initial concentration on the absorption of Cr(VI) onto CBC were systematically studied as well. The results showed that CBC400 prepared at 400 degrees C exhibited the highest Cr(VI) adsorption capacity for Cr(VI) up to 250.0 mg/g. The equilibrium adsorption and adsorption kinetics fitted the Langmuir isotherm and pseudo-second-order kinetic models well. The mechanisms of adsorption of Cr(VI) on CBC included electrostatic interaction, pi-pi interaction and functional groups complexation.
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