不同类型生物炭对CO_(2)吸附性能及其机理  

CO_(2) Adsorption Performance and Mechanism of Biochar Derived from Various Biomas

作　　者：游新秀 曹苓玉 徐浩亮 戴欢涛 项玮[1] 张学杨[1] YOU Xinxiu;CAO Lingyu;XU Haoliang;DAI Huantao;XIANG Wei;ZHANG Xueyang(College of Environmental Engineering,Xuzhou University of Technology,Xuzhou 221018,China)

机构地区：[1]徐州工程学院环境工程学院,江苏徐州221018

出　　处：《材料科学与工程学报》2024年第2期269-275,283,共8页Journal of Materials Science and Engineering

基　　金：江苏省自然科学基金资助项目(BK20201151);徐州市科技计划资助项目(KC21288)。

摘　　要：本研究以5种生物质为原料制备了生物炭,并对其进行理化表征,考察了生物炭对CO_(2)的吸附性能及机理。结果表明,椰壳(YK)、松木(SM)生物炭的比表面积是玉米芯(YM)、芦苇秆(LW)、椰衣(YY)生物炭的1.99~2.90倍。YK、SM对CO_(2)的吸附量(108.78~118.89 mg/g)高于YM、LW、YY(95.33~105.55 mg/g)。此外,YK中较高的S含量(2.17%)与碱度对CO_(2)吸附也起着促进作用。研究发现,生物炭的比表面积、孔径、碱度、官能团均是影响CO_(2)吸附的重要因素,当孔隙差异明显时,孔隙结构对CO_(2)吸附的影响会掩盖碱度带来的差异。Avrami模型和Langmuir模型可以较好地拟合生物炭对CO_(2)的吸附过程,表明CO_(2)在生物炭上的吸附以单层吸附为主。生物炭吸附CO_(2)是以物理吸附为主伴有化学吸附作用的过程,且受温度影响较大,当温度从0℃升高到65℃时,生物炭对CO_(2)的吸附量降低了73.42%~77.14%。经过5次CO_(2)吸脱附循环后,生物炭仍具有较高的可重复使用性(85.26%~98.41%),这表明生物炭具有良好的CO_(2)捕集潜力。Biochar derived from five kinds of biomass were prepared and characterized.The adsorption performance and mechanism of biochar for CO_(2) were investigated.The results showed that the specific surface area of biochar from coconut shell(YK)and pine wood(SM)was 1.99-2.90 times larger than that of corncob(YM),reed straw(LW)and coconut coat(YY)biochar.The adsorption capacity of YK and SM for CO_(2)(108.78-118.89 mg/g)was also higher than those of YM,LW and YY(95.33-105.55 mg/g).In addition,the high S content(2.17%)and total basicity of YK also promoted its CO_(2) adsorption.The results demonstrated that the specific surface area,pore size,total basicity,and functional groups of biochar were all important factors affecting CO_(2) adsorption.When the pore difference is obvious,the influence of pore structure on CO_(2) adsorption will cover up the difference in alkalinity.Avrami model and Langmuir model fitted the adsorption well,indicating that the adsorption of CO_(2) on biochar was dominated by monolayer adsorption.Adsorption of CO_(2) by biochar was mainly a process of physical adsorption accompanied by chemical adsorption,which was greatly affected by temperature.When the temperature increased from 0℃to 65℃,the adsorption capacity of CO_(2) by biochar was decreased by 73.42%-77.14%.After 5 cycles of CO_(2) adsorption-desorption,the biochar still showed high reusability(85.26%-98.41%),which demonstrated that the biochar was a promising adsorbent for CO_(2) capture.

关 键 词：CO_(2)捕集 生物炭 吸附 温室气体 吸脱附循环 

分 类 号：TQ424[化学工程]