Carbonate-intercalated Mg–Al layered double hydroxides (CO₃·Mg–Al LDHs) are examined as a means of sequestering gaseous pollutants, such as HCl, NO_x, and SO_x, which are bound to afford X·Mg–Al LDH (X = Cl, SO₄, or NO₃). In view of the fact that the common regeneration method of CO₃·Mg–Al LDH (agitation in aqueous Na₂CO₃) poses a number of problems, we herein develop a new method of regenerating CO₃·Mg–Al LDH by treatment of X·Mg–Al LDH with gaseous CO₂ under neutral or alkaline conditions. The desorption of X is shown to follow the intraparticle diffusion model, featuring the diffusion of CO₃²⁻ in between LDH layers as the rate-determining step. Given the importance of LDHs for wastewater treatment and gaseous pollutant removal, the obtained results pave the way to the efficient utilization of these adsorbents and contribute to the development of next-generation decontamination techniques.

碳酸盐插层的Mg-Al层状双氢氧化物（CO ₃ ·Mg-Al LDHs）被作为一种隔离气态污染物（如HCl，NO _x和SO _x）的手段进行了研究，这些污染物必将提供X·Mg-Al LDH （X ＝ Cl，SO ₄或NO ₃）。鉴于常见的CO ₃ ·Mg-Al LDH的再生方法（在Na ₂ CO ₃水溶液中搅拌）存在许多问题，我们在此开发了一种通过处理再生CO ₃ ·Mg-Al LDH的新方法。气态CO ₂去除X·Mg-Al LDH在中性或碱性条件下。X的解吸显示遵循颗粒内扩散模型，其特征在于，CO ₃ ^2-在LDH层之间的扩散是速率确定步骤。鉴于LDH在废水处理和气态污染物去除中的重要性，获得的结果为有效利用这些吸附剂铺平了道路，并为下一代去污技术的发展做出了贡献。