The capture of CO 2 from ambient air (400 ppm) has become a critical issue in combating climate change. In this study, a novel recombinant 13X zeolite (RS13X) with an Faujasite (FAU) structure was synthesized by transforming discarded Linde type A (LTA)-structured 4 A molecular sieves through alkali fusion. This material was subsequently modified with hydrazine (HZ) vapor to produce HZ-RS13X, which significantly enhances the pore structure of RS13X, leading to excellent CO 2 adsorption performance across a range of concentrations. Specifically, HZ-RS13X demonstrates excellent adsorption capacities of 2.16 mmol/g at 400 ppm, 6.14 mmol/g at 10,000 ppm, and 7.89 mmol/g at 100,000 ppm, highlighting its efficacy for industrial CO 2 emissions. Additionally, HZ-RS13X excels in the selective separation of CO 2 from CH 4 and N 2 , exhibiting high ideal adsorbed solution theory (IAST) selectivity values of 335 for a CO 2 /N 2 mixture (10/80) and 260 for a CO 2 /CH 4 mixture (50/50). Characterization results, along with grand canonical Monte Carlo (GCMC) simulations, reveal that HZ vapor modification enhances CO 2 adsorption modes of RS13X beyond those achieved through conventional carbamate generation methods. HZ-RS13X offers substantial CO 2 capture potential across a wide range of concentrations, from atmospheric levels to industrial emissions, presenting a promising strategy for solid-state CO 2 capture.
Molecular sieves were widely used in the chemical industry, which caused a large number of inactivated molecular sieves to be discarded, resulting in a serious waste of resources and environmental pollution. Recently, recycling of discarded molecular sieves (DMS) has become a research hotspot. This study proposes an economical method using DMS to prepare green pigments mimicking foliage spectrum. The synthesized products were subjected to characterization using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Ultraviolet-visible-diffuse reflectance spectroscopy (UV-Vis-DRS), and scanning electron microscopy (SEM). The analysis revealed that sulfur radicals can be effectively incorporated as chromophores within the β-cages that are formed during the recrystallization process of sodalite, these cages are highly conducive to accommodating the radicals, thereby providing a protective environment that shields them from external influences. By adjusting the mass ratio of Na 2 CO 3 /S, the visible reflectance spectrum of ultramarine pigments can be easily modified. In addition, camouflage coating based on ultramarine green can be used to simulate the spectral reflectance characteristics of green vegetation. The Spectral Angle Mapping (SAM) system was used to evaluate the simulation effect of the camouflage coating. At a threshold below 98.5%, the camouflage coating still be misidentified as leaves, this method can recycle massive solid waste resources and significantly reduce the preparation cost of imitation green vegetation camouflage pigments.
危险品化学品经营许可证（带存储）