Journal
BIORESOURCES AND BIOPROCESSING
Volume 8, Issue 1, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1186/s40643-021-00364-8
Keywords
Cotton stalk; Acid; base pretreatment; Hydrothermal carbonization; Plant tissues; MB removal
Categories
Funding
- Scientific Research Program of Universities in Xinjiang Uygur Autonomous Region [XJEDU2019Y068]
- Research Foundation of China University of Petroleum-Beijing at Karamay [YJ2018B02006]
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The study focuses on converting cotton stalk into hydrochar through acid/base pretreatment and hydrothermal carbonization method, analyzing its morphological and chemical compositions, as well as its effectiveness in methylene blue removal. The results demonstrate that acid/base pretreatment is beneficial for producing high-quality hydrochar from cotton stalk.
Conversion of the abundant agricultural residual cotton stalk (CS) into useful chemicals or functional materials could alleviate the fossil fuels caused energy shortages and environmental crises. Although some advances have been achieved, less attention has been paid to the plant tissues effect. In this study, the plant tissue of CS was changed by part degradation of some components (hemicelluloses and lignin, for example) with the aid of acid/base (or both). The pretreated CS was transformed into hydrochar by hydrothermal carbonization (HTC) method. Morphological and chemical compositions of CS hydrochar were analyzed by various techniques, including elemental analysis, Fourier transform infrared (FTIR), BET analysis, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). Methylene blue (MB) removal of prepared CS hydrochar was used to evaluate CS hydrochar pollutions adsorption capacity. Results reveal acid/base (or both) pretreatment is beneficial for CS raw material to prepare high-quality CS hydrochar. The effects of some parameters, such as initial MB concentration, temperature, pH value and recyclability on the adsorption of MB onto both acid and base-pretreated CS hydrochar (CS-H2SO4 + NaOH-HTC) were studied. The present work exhibits the importance of agricultural waste biomass material plant tissues on its derived materials, which will have a positive effect on the direct utilization of waste biomass.
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