The process of PH 3 adsorption removal for purifying yellow phosphorus tail gas on the spot with flowershaped CuO was investigated in this study. Flower-shaped and irregular-shaped CuO/AC adsorbents were prepared by hydrothermal and impregnation methods, respectively. They can effectively remove PH 3 less than 1 mg m À3 and the purification efficiency is nearly 100% without fluctuation. However, the morphology of CuO on the adsorbent surface plays an important role in phosphine adsorption. The breakthrough adsorption capacity of the flower-shaped CuO adsorbent was 96.08 mg(PH 3 )/g(adsorbent), which was 2.23 times that for irregular-shaped CuO. The purification efficiency of the flower-shaped CuO was also influenced by temperature, oxygen volume fraction and space velocity. At a temperature of 100 C and an oxygen volume fraction of 1.6%, the adsorption capacity is the best. The adsorbent can be renewed and the regenerated catalyst can also efficiently remove PH 3 with a purification efficiency of nearly 100%. In the process of catalytic oxidation, according to XPS, we can conclude that CuO plays a very important role in phosphine adsorption and that oxygen is able to accelerate the oxidation of PH 3 and oxidize Cu to regenerate the active species in the process of purification.
The uniformly dispersed and structured silica nanoparticles were prepared and functionalized by amino and 2-bromoisobutyrate successively. The triple responsive polymer brushes were synthesized from the functionalized silica particles by SI-ATRP.
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