摘要
为评价花生壳生物炭农业与环境领域应用价值与潜力,该研究分别在100~800℃条件下制备花生壳生物炭,测定其孔隙参数,以期了解花生壳生物炭在不同热解温度条件下的孔结构变化规律。结果表明,在100~500℃条件下制备的花生壳生物炭以中孔和大孔为主,其吸附解析等温线为Ⅱ类吸附等温线,迟滞回线属于H3型,孔隙结构主要由狭缝孔构成;600~800℃条件下制备的生物炭以微孔为主,其吸附解析等温线为Ⅰ类吸附等温线,迟滞回线属于H4型,孔隙结构主要是锥形孔。当热解温度从100℃上升至600℃过程中,BET比表面积、比孔容均呈上升趋势,同时t-Plot微孔比表面积、t-Plot微孔孔容、中孔比表面积、中孔孔容也均在600℃时基本达到最高水平。花生壳生物炭的孔径分布随温度的变化非常明显,孔峰主要在3~5 nm处,100~600℃条件下峰值表现为升高趋势,600~800℃条件下峰值逐渐降低,与比表面积分布图结果相一致。花生壳生物炭孔隙表面分形维数D1和体积分形维数D2均在600~800℃条件下水平较高,高热解温度导致孔隙结构的复杂程度有所增加,生物炭表面更加粗糙。根据花生壳生物炭在不同热解温度条件下的孔结构变化规律,为花生壳生物炭制备及应用提供参考依据,有利于实现花生壳综合高效利用。
To evaluate the application value and potential of peanut-shell-biochar in agriculture and environment,this study prepared the peanut-shell-biochar under the condition of 100℃to 800℃,respectively,to determined pore parameters and explored the formation of peanut-shell-biochar pore structures under different pyrolytic temperatures.Distribution of pore volume and size was calculated by using the Barrett-Joyner-Halenda(BJH)model and the total pore volumes were estimated with the adsorbed amount at a relative pressure(P/P0)of 0.993.The fractal dimension was calculated using the fractal Frenkel-Halsey-Hill(FHH)model.Results showed that under pyrolysis temperature of100℃to 500℃,peanut-shell-biochars was mainly composed of mesopores and macropores but its pore structure was mainly composed of slit pore.The adsorption-desorption isotherms belonged to typeⅡor hysteresis loops H3 under pyrolysis temperature of 600℃to 800℃.When the biochar was nominated by micropores,the adsorption-desorption isotherm was typeⅠand hysteresis loops type H4.The BET specific surface area and specific pore volume increased from 100℃to 600℃.And the t-Plot micropore specific surface area,t-Plot micropore specific pore volume,mesopore pore specific surface area,and mesopore specific pore volume reached the peak values under 600℃.Pore size distribution of peanut-shell-biochar varied very apparently with the temperatures.Pore peaks were mainly in 3-5 nm and showed rising trend from 100℃to 600℃but gradually reduced trend from 600℃to800℃.The distribution of specific surface area was similar with that of pore peak.Pore surface fractal dimension(D1)and volume fractal dimension(D2)were higher under the condition of 600℃to 800℃,and higher temperatures increased the complexity of the pore structure.
作者
付仲毅
于晓娜
张晓帆
李志鹏
凌天孝
周涵君
孟琦
张胜
叶协锋
FU Zhong-yi;YU Xiao-na;ZHANG Xiao-fan;LI Zhi-peng;LING Tian-xiao;ZHOU Han-jun;MENG Qi;ZHANG Sheng;YE Xie-feng(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;Xiangxi Autonomous Prefecture Tobacco Company of Hunan,Xiangxi 416000,China)
出处
《土壤通报》
CAS
北大核心
2018年第3期575-581,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
花生壳
生物炭
孔隙特征
分形维数
Peanut shell
Biochar
Pore characteristics
Fractal dimension
