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.
The removal of lead in drinking water has attracted considerable attention of researchers in recent years, especially, the trace characteristic of lead is a challenge to water treatment. Herein, 13X zeolite/reduced graphene oxide composite material (13X-rGO) with hierarchically porous structure was successfully prepared using graphene oxide (GO) and 13X zeolite via a chemical reduction method and presented great performance for removing trace Pb(II) from drinking water. The influence of some important parameters including adsorbent dosage, contact time, initial lead concentration, coexisting competing ions, solution pH value, etc. on the removal of Pb(II) was systematically investigated. The composite material showed better adsorption properties compared with a single component and their physical mixture, confirming the synergistic effect of rGO and 13X zeolite on Pb(II) adsorption. The effluent lead concentration could be decreased to the level permitted by World Health Organization (WHO) (<10 ppb) within 30 s under calcium content of 20 ppm and initial lead concentration of 150 ppb. Simultaneously, the as-prepared 13X-rGO performed excellent adsorption capacity meeting WHO standard (6.07 mg/g), which was about 2.23 times that of single 13X zeolite (2.72 mg/g). In the presence of interfering ions, the lead concentration could still be reduced to safe drinking water standard. Moreover, the adsorbent could be effectively regenerated by saturated sodium chloride solution. Therefore, 13X-rGO can be introduced as a promising adsorption material for the purification of drinking water contaminated with trace lead owing to rapid adsorption, low cost and recycling potential.
危险品化学品经营许可证（带存储）