类水滑石Ti/Li/Al-LDHs的制备及其CO2吸附性能

Preparation of hydrotalcite-like Ti/Li/Al-LDHs and its performance in CO2 adsorption

  • 摘要: 采用共沉淀法制备了一系列新型的类水滑石Ti/Li/Al-LDHs材料,通过原子吸收光谱(AAS)、X射线衍射(XRD)、扫描电镜(SEM)、热重分析(TG)和傅里叶变换红外光谱(FT-IR)等技术对其进行了表征,研究了不同金属元素比例和焙烧温度对该Ti/Li/Al-LDHs材料的结构、形貌及其CO2吸附性能的影响。结果表明,当Ti/Li/Al比为1:3:4时,水滑石Ti/Li/Al-LDHs的结晶度最好,形貌最规整,而Ti/Li/Al比为1:3:2、300℃下焙烧后得到的Ti1Li3Al2-LDHs300的CO2吸附性能最好。Ti1Li3Al2-LDHs300上CO2吸附量可达53.5mg/g,10次循环吸附后,CO2吸附量仅下降了2.4%。

     

    Abstract: A series of hydrotalcite-like Ti/Li/Al-LDHs materials were prepared by co-precipitation method and characterized by atomic absorption spectrophotometer (AAS), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal gravimetric analysis (TG) and Fourier transform infrared (FT-IR); the influence of metal composition and calcination temperature on the structure, morphology and CO2 adsorption capacity of Ti/Li/Al-LDHs was investigated. The results showed that Ti1Li3Al4-LDHs obtained with a Ti/Li/Al ratio of 1:3:4 displays the highest crystallinity and regular morphology, whereas Ti1Li3Al2-LDHs300 prepared with a Ti/Li/Al ratio of 1:3:2 and calcined at 300℃ exhibits the best adsorption performance towards CO2. The CO2 adsorption capacity over Ti1Li3Al2-LDHs300 reaches 53.5mg/g; in addition, the adsorption capacity is only decreased by 2.4% after adsorption for 10 cycles.

     

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