It has been reported that the addition of graphene oxide (GO) can increase the dispersion and heterogeneous nucleation of layered double hydroxide (LDH), thus providing more active sites, which is more conducive to CO₂ adsorption. Herein, we reported alkali metal nitrates ((Li_0.3Na_0.18K_0.52)NO₃) promoted LDH and GO composites (LDH/GO) as adsorbents for CO₂ capture. The influence of mass ratio of LDH to GO, the impregnation ratio of alkali metal nitrates, the calcination and adsorption temperature, as well as the cycling stability were investigated systematically. The results indicated that the CO₂ capture capacity of LDH/GO composite with 30 mol% (Li_0.3Na_0.18K_0.52)NO₃ could reach 4.51 mmol·g⁻¹, which was 5.86 times higher than LDH/GO1 without loading alkali metal nitrates. Moreover, it had outstanding CO₂ adsorption capacity in the range from 200 °C to 320 °C. In addition, the cyclic adsorption and desorption test manifested that the CO₂ uptake of the material can reach 3.07 mmol·g⁻¹ after 22 cycles. We believe that this study will give a significant contribution to fabrication of LDH based composites as CO₂ adsorbents in future study.

据报道，氧化石墨烯（GO）的加入可以增加层状双氢氧化物（LDH）的分散和异相成核，从而提供更多的活性位点，更有利于CO _{2 的}吸附。在此，我们报道了碱金属硝酸盐 ((Li _0.3 Na _0.18 K _0.52 )NO ₃ ) 促进了 LDH 和 GO 复合材料 (LDH/GO) 作为 CO ₂捕获的吸附剂。系统研究了LDH与GO的质量比、碱金属硝酸盐的浸渍比、煅烧和吸附温度以及循环稳定性的影响。结果表明，LDH/GO复合材料的CO ₂捕获能力为30 mol%（Li_0.3 Na _0.18 K _0.52 )NO ₃可达到4.51 mmol·g ^-1，比未负载碱金属硝酸盐的LDH/GO1高5.86倍。此外，它在 200 °C 到 320 °C 的范围内具有出色的 CO ₂吸附能力。此外，循环吸附和解吸试验表明，材料在循环22次后CO ₂吸收量可达3.07 mmol·g ^-1。我们相信，这项研究将对制备 LDH 基复合材料作为未来研究中的CO ₂吸附剂做出重大贡献。