轻质碳酸钙加填量对PCCP/LCP-1复合材料气体吸附性能的影响

Effect of Precipitated Calcium Carbonate Content on the Gas Adsorption Performance ofMOFs/Cellulosic Fiber Composites

中文关键词:  轻质碳酸钙  金属有机骨架化合物  植物纤维  吸附材料

Key Words:PCC  MOFs  cellulosic fiber  adsorption material

中文摘要:

      利用原位生长法制备了轻质碳酸钙（PCC）加填的植物纤维纸基（PCCP）/金属有机骨架化合物（MOFs，即Zn₂(BTC)₄，标记为LCP-1）复合材料（PCCP/LCP-1），探讨了PCC加填量对复合材料气体吸附性能的影响；采用傅里叶变换红外光谱仪（FT-IR）、X射线衍射仪（XRD）、扫描电子显微镜（SEM）、热重分析仪（TGA）和氮气吸附法（BET）研究了LCP-1与植物纤维的键合方式以及复合材料的表面形貌、比表面积、热稳定性和吸附行为。结果表明，LCP-1与植物纤维之间以酯键结合，PCC加填量的增加可使纸张纤维网络体系暴露出更多的游离羟基，有利于提高LCP-1在PCCP表面的沉积率。此外，PCC的位阻效应降低了LCP-1在PCCP表面的生长空间，导致LCP-1尺寸变小。BET实验表明，与未添加PCC的复合材料相比，添加PCC可显著提高复合材料的吸附性能，且随着PCC加填量的增加，复合材料的氮气吸附量也逐渐提高。

Abstract:

      Cellulosic fiber paper base containing various filler content (PCCP)/metal-organic framework compound (MOFs[LCP-1]) composite (PCCP/LCP-1) was prepared by in-situ growth method. The present work investigated the effect of filler precipitated calcium carbonate (PCC) content on the gas adsorption performance. The bonding modes of LCP-1 and cellulosic fibers, as well as the surface morphology, specific surface area, thermal stability and adsorption behavior of composites were characterized by FT-IR, XRD, SEM, TGA and BET. Results showed that ester bonds existed between LCP-1 and the cellulosic fibers. The increase of PCC content helped to expose more free hydroxyl groups in cellulosic paper, which was beneficial to the deposition rate of LCP-1 on the paper surface. Moreover, the addition of PCC could confine the growing space of LCP-1, resulting in the smaller size of LCP-1. Nitrogen adsorption data showed that the use of PCC could significantly improve the adsorption performance of the composite. The adsorption amount increased as the PCC addition increased from 10% to 40% compared with the composite without PCC.