采用程序升温限氧法,在不同温度下制备小麦秸秆生物炭,探究其表面形态、官能团和理化特性随碳化温度升高的演变规律。在此基础上设计基于生物炭的电极,并对其电化学性能进行测试。结果表明：生物炭内部保留了秸秆纤维素多层的束状结构,呈层状、狭缝型非均匀的孔道。随着碳化温度的升高,其表面形态经历蜂窝状小孔、多层维束结构坍塌、边缘熔融和表面析出结晶盐4个阶段。秸秆生物炭具有优越的电容性能,以WB600 ℃的电化学性能最为突出。当碳化温度≥600 ℃时,在波数1430~1870 cm-1之间,还出现众多杂乱的弱峰。这是由于随着碳化温度的升高,生物炭中—CH==基团转化为C==O基团,生成具有环状结构的得电子基团——醌类。
Abstract
The programmed heating and oxygen limiting method technique is used to prepare wheat straw biochar at different temperatures. The effect of carbonization temperature on surface morphology, functional groups and physicochemical properties with the increase of carbonization temperature are investigated. Then, electrode is designed based on biochar and its electrochemical performance is evaluated. The results show that the biochar retains the multilayer bundle structure of straw cellulose, which is layered and non-uniform slit pore. Straw biochar has excellent capacitance properties, and the electrochemical performance of WB600 ℃ biochar is the most prominent. It has been observed from FTIR results that when the carbonization temperature is ≥600 ℃,there are several weak scattered between 1430-1870 cm-1. This is due to the thermal fusion of the crystal structure of lignin with the increase of carbonization temperature. The — CH== group in biochar is transformed into C==O group, resulting in ketones with ring structure is formed.
关键词
秸秆 /
生物炭 /
理化特性 /
热解温度 /
电化学
Key words
straw /
biochar /
physicochemical properties /
pyrolysis temperature /
electrochemistry
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基金
秸秆高效清洁捆烧技术与装备研究（201503015）; 河南省牧业经济学院2019年博士科研启动基金（2019HNUAHEDF16）; 河南省科技项目（212102110228）
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