乙醇溶剂热法制备絮衍生多孔碳及其吸附性能
丁佩佩, 段晶莹, 徐浩然, 方馨茹, 刘星雨, 闫俊涛, 王春蕾
【无机化学学报】doi: 10.11862/CJIC.20250370
以杨絮(PC)为原料,采用乙醇溶剂热法对其进行预处理,再进行碳化,制备了高比表面积的杨絮衍生多孔碳(DPCC),并研究了其对染料的吸附性能及动力学性能。通过单因素实验优化工艺参数,确定最佳预处理条件(液固比为17 mL·g-1、200 ℃处理2 h),在此条件下制备的DPCC-10比表面积达到518 m2·g-1。结合傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、拉曼(Raman)光谱、扫描电镜(SEM)和N2吸附-脱附测试等表征手段,证实预处理过程能够有效去除木质素和半纤维素等,形成丰富的多级孔道结构。吸附实验表明,DPCC-10对亚甲蓝(MB)的最大吸附量达到385.71 mg·g-1,优于多数报道的生物质衍生吸附剂。DPCC-10对染料的吸附过程满足准二级动力学方程,表明该吸附以化学吸附为主。经过4次吸附-脱附循环后,DPCC-10对MB的吸附容量仍保持初始值的92.01%,表明材料具有优异的可再生性能。
关键词: 杨絮, 生物质多孔碳, 吸附, 动力学
Highly selective acetylene capture by a pacs-type metal-organic framework constructed using metal-formate complexes as pore partition units
Hongzhe GUO, Sen WANG, Lu YANG, Fucheng LIU, Jiongpeng ZHAO, Zhaoquan YAO
【无机化学学报】doi: 10.11862/CJIC.20250179
To obtain materials capable of efficiently separating acetylene (C2H2) from carbon dioxide (CO2) and ethylene (C2H4), In this work, based on the pore space partition strategy, a pacs-metal-organic framework (MOF): (NH2Me2)2[Fe3(μ3-O)(bdc)3][In(FA)3Cl3] (Fe-FAIn-bdc) was synthesized successfully by using the metal-formate complex [In(FA)3Cl3]3- as the pore partition units, where bdc2-=terephthalate, FA-=formate. Owing to the pore partition effect of this metal-organic building block, fruitful confined spaces are formed in the network of Fe-FAIn-bdc, endowing this MOF with superior separation performance of acetylene and carbon dioxide. According to the adsorption test, this MOF exhibited a high adsorption capacity for C2H2 (50.79 cm3·g-1) at 298 K and 100 kPa, which was much higher than that for CO2 (29.99 cm3·g-1) and C2H4 (30.94 cm3·g-1) under the same conditions. Ideal adsorbed solution theory (IAST) calculations demonstrate that the adsorption selectivity of Fe-FAIn-bdc for the mixture of C2H2/CO2 and C2H2/C2H4 in a volume ratio of 50∶50 was 3.08 and 3.65, respectively, which was higher than some reported MOFs such as NUM-11 and SNNU-18.
关键词: pore space partition strategy, metal-organic framework, pore-partition ligands, separation of C2H2/CO2

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