植物营养与肥料学报2017，Vol.23Issue(5)：1268-1275,8.DOI:10.11674/zwyf.16467
热解温度对玉米秸秆炭产率及理化特性的影响
Physiochemical properties and yields of corn-stalk-biochar under different pyrolyzed temperatures
摘要
Abstract
[Objectives] The physiochemical properties of corn-stalk-biochar were largely determined by the carbonization temperature. The aim of the experiment was to investigate the yields and physiochemical properties of corn-stalk-biochar at different pyrolyzed temperatures (100℃-800℃), looking for the suitable temperature in which biochar has a high use value.[Methods]Corn-stalk-biochar was prepared through the hypoxia carbonization method. The furnace temperatures were set at 100℃, 200℃, 300℃, 400℃, 500℃, 600℃, 700℃and 800℃, respectively, and the rate of heating up was 20℃/min and finally held at that temperature for 2 hours. We studied the properties, including pH, total N and total C content, and CEC of biochar. [Results]The yields of corn-stalk-biochar were decreased with the rising of pyrolysis temperature. The total C contents were increased with the increase of pyrolysis temperature, the total N contents started to decrease when the temperature was higher than 400℃. The CEC of corn-stalk-biochar reached peak values between 400℃-600℃, which were 70.87-83.48 cmol/kg. With the increase of carbonization temperature, the alkaline functional groups contents on the corn-stalk-biochar surface were increased significantly, while the acidic functional groups contents were reduced significantly. The pH values of corn-stalk-biochar became alkaline after 400℃ and would continue to increase to strong alkaline with the further increase of temperature. When the pyrolysis temperature reached 500℃, the cellulose and hemicellulose were completely decomposed, and the groups of -OH, -CH3, -CH2,-C=O would be associated or eliminated to form new aromatic groups. With the carbonization temperature increasing, the specific surface area and pore volumes of corn-stalk-biochar were both increased firstly and then declined. However, the pore sizes showed an opposite trend. The porosity of corn-stalk-biochar was relatively more abundant at 400℃-600℃. The specific surface area showed a significant highly positive correlation with the pore volume.[Conclusions] Comprehensively considering the effects of yields and physiochemical properties, the optimum carbonization temperature of corn-stalk-biochar should be remained at 400℃-500℃.关键词
玉米秸秆炭/热解温度/炭化/理化特性Key words
corn-stalk-biochar/pyrolysis temperature/carbonization/physiochemical characteristics引用本文复制引用
叶协锋,周涵君,于晓娜,张晓帆,李志鹏,付仲毅,孟琦..热解温度对玉米秸秆炭产率及理化特性的影响[J].植物营养与肥料学报,2017,23(5):1268-1275,8.基金项目
烟草行业烟草栽培重点实验室资助项目 （）
河南省烟草公司资助项目(HYKJ201301) （HYKJ201301）
重庆市烟草公司资助项目(NY20140401070010)资助. （NY20140401070010）
