摘要
分别对100~800℃下于马弗炉中低氧炭化制备的烟秆生物炭进行研究,分析其基础理化性质的变化。结果表明,烟草秸秆生物炭微量元素含量在热解温度为100~400℃时呈逐渐上升的趋势,在400~500℃时较为稳定;大量元素含量增加;C含量和N元素含量在100~300℃时逐渐增加,在400~800℃时先增加后下降,C/N在300~500℃时较为稳定。随着热解温度的升高,烟草秸秆生物炭表面水分子、甲基和亚甲基等官能团减少,C=C含量逐渐增多;烟草秸秆生物炭的BET比表面积、孔径、比孔容均在400~500℃时较大。烟草秸秆生物炭的中孔较多,孔隙内部特征多为墨水瓶状孔。热解温度为400~500℃时,烟杆生物炭大量和微量元素含量相对较高,C/N较为稳定,孔隙结构最为复杂。
The tobacco stalk was carbonized under different temperatures from 100 ℃ to 800 ℃, and then the basic physical and chemical properties of biochars were measured. The results showed that the mineral micro-element contents of tobacco-stalk biochar were increased with the increase of pyrolysis temperature at 100-400 ℃ and kept relatively stable at 400-500 ℃. Mineral macro-element contents were showed overall an increased trend with the pyrolysis temperature rise. The contents of carbon(C) and nitrogen(N) were increased gradually from 100 ℃ to 300 ℃ and then were declined from 400 ℃ to 800 ℃, and the C/N ratio was relatively stable at 300-500 ℃. With the increase of pyrolysis temperature, surface functional groups of tobacco-stalk biochar get condensed and its aromatization degree was heightened. With the pyrolysis temperature rise, the porosity of tobacco-stalk biochar was increased first and then decreased. The BET specific surface area, pore size and pore volume of tobacco-stalk biochar were the highest at 400-500 ℃. The mesopores were the main type of pores in tobacco-stalk biochar and mainly consisted of ink-bottle-like pores. The tobacco-stalk-biochar had higher macro-and micro elements, stable C/N, and complex pore structure at 400-500 ℃.
作者
徐亮
于晓娜
李雪利
王悦霖
宋佳倩
叶协锋
卢剑
XU Liang;YU Xiao-na;LI Xue-li;WANG Yue-lin;SONG Jia-qian;YE Xie-feng;LU Jian(Tobacco Science College of Henan Agricultural University/National Tobacco Cultivation and Physiology and Biochemistry Research Centre/Key Laboratory for Tobacco Cultivation of Tobacco Industry,Zhengzhou 450002,China;China Tobacco Corporation Staff Training College,Zhengzhou 450008,China;Xichang Branch of Liangshan Prefecture company of Sichuan tobacco company,Xichang 615000,China)
出处
《土壤通报》
CAS
CSCD
北大核心
2021年第1期75-81,共7页
Chinese Journal of Soil Science
基金
烟草行业烟草栽培重点实验室资助项目(30800665)
河南省烟草公司资助项目(HYKJ201301)
重庆市烟草公司资助项目(NY20140401070010)资助。
关键词
烟秆
生物炭
热解温度
物理特征
化学特性
Tobacco-stalk
Biochar
Pyrolysis temperature
Physical property
Chemical property
