多孔材料负载KHCO_3吸附剂的结构表征

Structure Characterization of Porous Materials Loading with Potassium Bicarbonate

为了探究活性炭颗粒、分子筛、活性氧化铝颗粒3种多孔材料负载KHCO3后负载率及孔径情况，实验对负载KHCO3的3种材料进行了结构表征，着重对KHCO3负载率、多孔材料负载前后比表面积、总孔容积以及附着情况展开研究。通过氮吸附进行分析，发现活性炭负载后比表面积变小，负载率与比表面积成反比，但大于其他2种多孔材料。总孔容积在负载后同样都有所下降，活性炭下降幅度最小，活性炭主要被活性组填充了0—100nm之间的孔，而分子筛与氧化铝主要被填充了0-250nm的孔；利用扫描电镜和等高图分析KHCO3负载后在多孔材料上的附着情况，发现活性炭不仅孔隙表面附着颗粒，而且内部也粘附了许多类似结晶结构的碎屑及晶状体，同时还能看清活性炭孔径轮廓，孔径没有堵塞的现象，而分子筛和氧化铝负载之后，有大量的颗粒碎屑堆积在表面，已看不清楚表面轮廓，有堵塞孔径的现象。

To explore load rate and aperture of three kinds of porous materials such as activated carbon particles, molecular sieve and activated alumina particles loaded with KHCO3, the experiment was done for the structure characterization of KHCO3 loaded materials, with focus on load rate of KHCO3, specific surface area, total pore volume and adhesion. Through nitrogen adsorption analysis, it was found that specific surface area of the activated carbon after loading was smaller, load rate and specific surface area was inversely proportional, but more than the other porous materials. After loading the total pore volume was also declined, with activated carbon mainly filled by active group between hole of 0-100 nm, while molecular sieve and alumina mainly filled with 0-250 nm hole. Scanning electron microscopy and contour map analysis of the situation of adhesion indicated that the activated carbon is not only pore surface adhered particle and adhere many similar crystal structure of clastics and lens in inside, also aperture outline of activated carbon and aperture blocking can be seen, but molecular sieve and alumina have a large number of particle clastics accumulation in the surface, clearly surface and aperture blocking cannot be seen.