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

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。

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

Cellulosic fiber paper base containing various filler content (PCCP)/metal-organic framework compound (MOFsLCP-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.