沥青基超交联聚合物的制备及其VOCs的吸附性能

Synthesis of pitch-based hyper cross-linked polymer and its adsorption properties of VOCs

摘要:

以沥青为原料，二氯甲烷（DCM）为溶剂和交联剂，无水三氯化铝（AlCl3）为催化剂，基于付克烷基化反应，制备出系列沥青基超交联聚合物（通过改变交联剂用量制备出不同产物HCP-1、HCP-2、HCP-3、HCP-4和HCP-5）。用傅里叶变换红外光谱、N2吸附-脱附、扫描电子显微镜和热重分析对HCPs进行了结构表征。结果表明，DCM与沥青成功交联，HCPs的最高比表面积为467m2/g，孔道以介孔为主，HCPs热稳定性较高。静态吸附实验结果表明，HCPs对含芳环类、酯类、醇类VOCs均有较好的吸附性能。其中，对邻二甲苯吸附量最高，为437.89mg/g，对甲醇吸附量最小，为190.48mg/g。HCPs对邻二甲苯进行5次循环吸附实验后，吸附量达新鲜HCP-4吸附量的91.51%。HCP-4用于吸附含芳环类VOCs有较好的应用前景。

Abstract:

A series of pitch-based Hyper cross-polymers (HCPs) were synthesized via the Friedel-Crafts alkylation reaction using pitch as material and dichloromethane (DCM) as solvent and external crosslinkers in the presence of AlCl3 (different products HCP-1, HCP-2, HCP-3, HCP-4 and HCP-5 were prepared by changing the amount of cross-linking agent). The prepared HCPs were characterized by FTIR, N2 adsorption-desorption, SEM and TGA. The results showed that DCM was successfully cross-linked with pitch, the highest specific surface area of HCPs is 467m2/g and its pore structure is mainly mesoporous. The HCPs have high thermal stability. The static adsorption results indicated that HCPs show better adsorption capacities for VOCs containing aromatic rings, esters and alcohols, the adsorption capacity of o-xylene is 437.89mg/g, and the adsorption capacity of methanol is 190.48mg/g. After five cycles of adsorption of o-xylene, the adsorption capacity of HCP-4 reached 91.51% of the first adsorption amount. HCP-4 is a promising candidate for the adsorption of aromatic ring-containing VOCs.