关键词: 分子筛, 表面改性, 二氧化碳捕集

Abstract: Functionalized structural modification of molecular sieves shows promising applications in gas separation, catalysis, and environmental protection. In this study, through bionic lotus leaf structure design, it was successfully coated polystryene-methyl methacrylate (PS-PMMA) onto the surface of 13X molecular sieves to form a hydrophobic layer. By integrating organic nanosurface structural pseudo-lotus leaf layers, the composite process of PS-PMMA and 13X was mild preparation conditions and did not disrupt the molecular sieve crystal structure. The resulting material exhibited excellent thermal stability up to 370 ℃ and showed a water contact angle of 127.6°. We successfully imparted outstanding hydrophobicity to 13X zeolite while retaining its inherent adsorption properties. Static adsorption experiments revealed that the modified molecular sieve exhibits Langmuir behavior with physical adsorption characteristics for CO2. After six hours of water-soaking and drying, it maintained over 92% adsorption capacity in ten consecutive cycles. Furthermore, under simulated wet flue gas conditions (15% RH, 15% CO2), the CO2 adsorption capacity reached 0.045 g/g, representing a 73% improvement over unmodified 13X. The material demonstrated superior CO2 adsorption performance in high-temperature, low-concentration, and humid environments, with a simple preparation method that holds significant potential for industrial carbon capture applications.

Key words: Zeolite; Surface modification, Carbon dioxide capture