不同热解温度制备的水稻秸秆生物炭理化特性分析  

Physical and Chemical Properties of Carbonized Rice-straw Prepared at Different Temperatures

作　　者：徐亮 王豹祥[2] 汪健[2] 卢剑 于晓娜 伍德洋 叶协锋 刘晓涵 李雪利 XU Liang;WANG Bao-xiang;WANG Jian;LU Jian;YU Xiao-na;WU De-yang;YE Xie-feng;LIU Xiao-han;LI Xue-li(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;Hubei China Tobacco Industry Co.,Ltd.,Wuhan 430040,China;Huidong Branch of Liangshan tobacco company of Sichuan tobacco company,Huidong 615000,China;China Tobacco Corporation Staff Training College,Zhengzhou 450008,China;Xichang Branch of Liangshan Prefecture company of Sichuan tobacco company,Xichang 615000,China)

机构地区：[1]河南农业大学烟草学院,国家烟草栽培生理生化研究基地,烟草行业烟草栽培重点实验室,河南郑州450002 [2]湖北中烟工业有限责任公司,湖北武汉430040 [3]四川省烟草公司凉山州公司会东分公司,四川会东615000 [4]中国烟草总公司职工进修学院,河南郑州450008 [5]四川省烟草公司凉山州公司西昌分公司,四川西昌615000

出　　处：《土壤通报》2020年第1期136-143,共8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和河南省烟草公司资助项目(HYKJ201301)资助。

摘　　要：以不同热解温度(100~800℃)制备的水稻秸秆生物炭为研究对象,研究在不同热解温度下制成的生物炭的理化特性。结果表明,热解温度为100~300℃制成的水稻秸秆生物炭呈弱酸性,400℃以上时呈碱性;水稻秸秆生物炭表面碱性含氧官能团数量随着热解温度的升高而增加、酸性含氧官能团则减少;水稻秸秆生物炭中的官能团C=C、C-O-C、-OH和-C=O在较高的热解温度下发生缔合或消除,促进了芳香基团的形成;随着热解温度的升高,水稻秸秆生物炭的阳离子交换量(CEC)、比表面积、孔径、比孔容、氮气吸附量和颗粒表面的分型维数(D1)均先增加后降低,阳离子交换量(CEC)在300~500℃时、其它性状在400~600℃之间达到最大值;以不同热解温度制成的水稻秸秆生物炭颗粒的孔隙结构均以孔隙宽度2~50 nm的中孔为主。随热解温度的升高,水稻秸秆生物炭的产率逐渐降低;400~500℃炭化2 h,生物炭产率最高,其孔隙结构最为复杂,所以可以认为400~500℃是水稻秸秆炭化的最佳温度。Rice straw biocharprepared at different pyrolysis temperatures(100-800℃),and its physicochemical properties after pyrolysis were analyzed.The production rate of rice straw biochar decreased with the increase of pyrolysis temperature.The cation exchange capacity(CEC)of biochar reached the maximum at 300-500℃and decreased gradually at 600-800℃.Rice straw biochar showed the weak acidity at 100-300℃and alkalinity above 400℃.The alkaline oxygen-containing functional groups on the surface of rice straw biochar increased,while the acidic oxygen-containing functional groups decreased with the increase of pyrolysis temperature.The association or elimination of C=C,C-O-C,-OH,and-C=O in rice straw biochar at higher pyrolysis temperature promoted the formation of aromatic groups.The specific surface area,pore size,specific pore volume,nitrogen adsorption capacity and fractal dimension of biochar increased first and then decreased with the increase of pyrolysis temperature,and reached the maximum between 400 and 600℃.The pore structure of rice straw biochar was mainly mesoporous(2-50 nm)at different temperatures.Under rice strawbiochar carbonized at 400-500℃for 2 hours,itsproduction ratewas the highest and its pore structure was the most complex.The optimal carbonization temperature of rice strawbiocharwas 400-500℃.

关 键 词：水稻秸秆 炭化 理化特性 热解温度 

分 类 号：X53[环境科学与工程—环境工程]