文献类型：期刊文献

中文题名：高热稳定性炭基复合吸附剂的制备及表征

英文题名：High Thermal Stability Carbon-based Composite Adsorbent:Synthesis and Characterization

作者：洪超[1,2] 许伟[2] 黄毅成[2] 刘军利[2]

第一作者：洪超

机构：[1]南京林业大学化学工程学院,江苏省林业资源高效加工利用协同创新中心,江苏南京210037;[2]中国林业科学研究院林产化学工业研究所,江苏南京210042

年份：2026

卷号：46

期号：1

起止页码：73-80

中文期刊名：林产化学与工业

外文期刊名：Chemistry and Industry of Forest Products

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划资助项目(2023YFD2201602)。

语种：中文

中文关键词：凹凸棒石;竹炭;水蒸气活化;热稳定性;吸附

外文关键词：attapulgite;bamboo charcoal;steam activation;thermal stability;adsorb

分类号：TQ35;TQ424.1

摘要：为解决粉炭成型过程中黏结剂污染和热稳定性差的问题,以竹炭(BC)为原料、凹凸棒石(AT)为黏结剂,通过挤压成型、炭化、水蒸气活化等工序,制备一系列高热稳定性的活性炭/凹凸棒石复合吸附剂(MAT)。通过N_(2)吸附-脱附对MAT孔结构进行了表征,采用SEM、FT-IR、XPS等对MAT的表面化学性质进行分析;利用热重分析仪(TG-DTG)、着火点测试和同步热分析仪(TG-DSC)考察AT添加量对MAT热稳定性的影响。研究结果表明:当BC与AT质量比为4∶1(即AT添加量为20%)、水蒸气活化温度为850℃、活化时间为120 min时,MAT-0.2-850-120的整体性能达到最佳,其比表面积(S_(BET))为627.92 m^(2)/g,总孔容(V_(tot))为0.412 cm^(3)/g,微孔率高达58.9%,碘吸附值(A_(I))为834.9 mg/g,亚甲基蓝吸附值(A_(M))为150 mg/g,CCl_(4)吸附率(A_(E))为42.2%,耐磨强度(A_(R))达到91.1%。表面化学分析结果表明:水蒸气活化后,AT晶体发生变形、收缩,含氧官能团增加,AT的胶黏作用力发生改变,Mg—O—Si键的形成使得MAT还能维持一定强度。热稳定分析结果表明:AT的添加能有效提高MAT的着火点和热稳定性,并能降低对正丁烷的吸附放热。其中,MAT-0.2-850-120的着火点为492℃,对正丁烷的最大吸附量为58.6 mg/g,单位质量吸附热为-43.21 J/g。
To address the issues of binder contamination and poor thermal stability during the formation process of powdered carbon,a series of highly thermally stable activated carbon/attapulgite composite adsorbents(MAT)were prepared using bamboo charcoal(BC)as the raw material and attapulgite(AT)as the binder through extrusion molding,carbonization,steam activation,and other related processes.The pore structure of MAT was characterized by N 2 adsorption-desorption analysis,while the surface chemical properties were analyzed using scanning electron microscopy(SEM),Fourier-transform infrared spectroscopy(FT-IR),and X-ray photoelectron spectroscopy(XPS).The influence of AT addition on the thermal stability of MAT was evaluated using thermogravimetric analysis(TG-DTG),ignition point testing,and simultaneous thermal analysis(TG-DSC).Research results indicated that when the mass ratio of BC to AT was 4∶1(i.e.,20%AT addition),the steam activation temperature was 850℃,and the activation time was 120 min,the composite adsorbent MAT-0.2-850-120 achieved optimal overall performance.Its specific surface area(S_(BET))reached 627.92 m^(2)/g,total pore volume(V_(tot))was 0.412 cm^(3)/g,and microporosity was as high as 58.9%.The iodine adsorption value(A_(I))was 834.9 mg/g,methylene blue adsorption value(A_(M))was 150 mg/g,CCl_(4) adsorption rate(A_(E))was 42.2%,and wear resistance strength(A R)reached 91.1%.Surface chemical analysis revealed that after steam activation,the AT crystals underwent deformation and shrinkage,oxygen-containing functional groups increased,and the adhesive properties of AT were altered.The formation of Mg-O-Si bonds contributed to the maintenance of structural integrity in MAT.Thermal stability analysis demonstrated that AT addition effectively enhanced the ignition point and thermal stability of MAT while reducing the heat released during n-butane adsorption.Specifically,MAT-0.2-850-120 exhibited an ignition point of 492℃,a maximum n-butane adsorption capacity of 58.6 mg/g,and a unit mass adsorption heat of-43.21 J/g.