New Insights into CO2 Adsorption on Layered Double Hydroxide (LDH)-Based Nanomaterials

作者：Tang, Nian; He, Tingyu; Liu, Jie^*; Li, Li; Shi, Han; Cen, Wanglai; Ye, Zhixiang

来源：Nanoscale Research Letters, 2018, 13(1): 55.

DOI：10.1186/s11671-018-2471-z

• Modified LDHs
• Weakly adsorption
• CO2 capture
• DRIFTS

The interlamellar spacing of layered double hydroxides (LDHs) was enlarged by dodecyl sulfonate ions firstly, and then, (3-aminopropyl)triethoxysilane (APS) was chemically grafted (APS/LDHs). The structural characteristics and thermal stability of these prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), reflectance Fourier transform infrared spectrometer (FTIR), thermogravimetric analysis (TG), and elemental analysis (EA) respectively. The CO2 adsorption performance was investigated adopting TG and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results presented that the CO2 adsorption capacity on APS/LDHs was as high as 90 mg/g and showed no obvious reduction during a five cyclic adsorption-desorption test, indicating its superior performance stability. The DRIFTS results showed that both carbamates and weakly bounded CO2 species were generated on APS/LDHs. The weakly adsorbed species was due to the different local chemical environment for CO2 capture provided by the surface moieties of LDHs like free silanol and hydrogen bonds.

• 出版日期2018-2-20
• 单位成都信息工程大学; 四川大学; 南方电网科学研究院有限责任公司