摘要
【目的】研究热解温度对滤泥生物炭性质特征的影响,为制糖废弃物处理提供参考依据。【方法】将滤泥置于200~600℃下热解制备生物炭,对生物炭进行工业分析、pH和元素含量测定,以及傅里叶红外光谱、扫描电镜、比表面积和碘值吸附分析。【结果】随着热解温度的升高,生物炭产率和挥发分含量下降、灰分含量上升,pH不断增加,表面的C-O和C-O-C等活性官能团及-CH3和-CH2逐渐消失,H/C、O/C和(N+O)/C的原子比降低,表明生物炭芳香性及稳定性增强,亲水性和极性减弱;生物炭的孔隙结构丰富,随着热解温度的升高,生物炭中孔隙数量增加,比表面积增大,孔径和孔容有所增加,对碘值的吸附能力持续上升,热解温度为500℃时,比表面积、孔容和对碘值吸附量均达最大值,分别为83.71m^2/g、0.027m^3/g和170.38mg/g。【结论】在500℃下热解制备滤泥生物炭,其产率相对较高,结构更稳定,且比表面积及孔容最大,对碘的吸附效果最佳,可作为一种优异的吸附材料。
【Objective】The effects of pyrolysis temperature on the characteristics of the filter mud biochar were studied to provide a scientific basis for the treatment of industrial waste.【Method】In this study,filter mud was pyrolyzed at 200-600℃ to prepare biochar. The biochar was analyzed and characterized through proximate analysis,pH measurement, elemental analysis,fourier transform infrared spectroscopy(FTIR)analysis,scanning electron microscope(SEM) analysis,specific surface area analysis and iodine adsorption analysis.【Result】The experimental results showed that as the pyrolysis temperature increased,the yield and volatile matter of biochar decreased,the ash content increased,the pH value increased continuously,and the active functional groups such as C-O and C-O-C and the -CH3 and -CH2 disappeared gradually from the surface of biochar and the atomic ratios of H/C,O/C,(N+O)/C were reduced,which indicating that the aromaticity and the stability of the biochar was increased,while its hydrophilic and polarity was reduced.The pore structure of biochar was rich. As the pyrolysis temperature increased,the number of pores in biochar increased,the specific surface area became larger,the pore size and pore volume increased,the adsorption capacity for iodine value continued to rise. When the pyrolysis temperature was 500℃,the specific surface area,pore volume and iodine adsorption capacity were the maximum,which were 83.71m^2/g,0.027m^3/g and 170.38 mg/g,respectively.【Conclusion】The preparation of biochar at 500℃ by pyrolysis has a relatively high yield,a more stable structure,the largest specific surface area and pore volume,and the best adsorption effect on iodine,which can be used as a good adsorbent material.
作者
刘法球
周少基
唐秋平
向敏
唐智光
LIU Fa-qiu;ZHOU Shao-ji;TANG Qiu-ping;XIANG Min;TANG Zhi-guang(School of Light Industry and Food Engeering,Guangxi University,Nanning 530004,China;Guangxi Rural Investment Group Agricultural Development Co.,Ltd.,Nanning 530004,China)
出处
《南方农业学报》
CAS
CSCD
北大核心
2019年第9期2071-2077,共7页
Journal of Southern Agriculture
基金
国家自然科学基金项目（31760469）
关键词
滤泥
生物炭
热解温度
热稳定性
结构
filter mud
biochar
pyrolysis temperature
thermal stability
structure
