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yungbonjut金虫 (小有名气)
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2.2.1 BET表征 由图1可知,0.01mol/L的AgNO3制备的Ag-MAC吸附等温曲线属于IV吸附等温线。在较低压力下表现为单分子吸附,显示载体的微孔性质;在压力较高时,表现为多层吸附,显示载体的介孔特性。当压力达到一定高度时,ADS和DES显著增加,表现为表面吸附。同时,吸附等温线和脱附等温线不完全重合,表现出H3型的滞后环,表明了载体孔道尺寸的不均一性,这符合碳材料载体的特性,也说明MAC经此浓度的AgNO3修饰后没有改变其孔道特性,没有因为银粒子的沉积而堵塞孔道,为进一步的固载优化实验提供了基础。 |
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爱与雨下(金币+1): 2011-11-05 18:44:50
sltmac(金币+25): 2011-11-10 09:49:43
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2.2.1 BET characterization According to Fig.1, the absorption isotherm of Ag-MAC produced by 0.91mol/L AgNO3 is IV absorption isotherm. It shows single-molecule absorption under lower pressure and feature of micropore in carrier; while it shows multi-layer absorption under higher pressure and feature of mesopore in carrier. When pressure reaches certain height, ADS and DES increase dramatically and show surface absorption. Meanwhile, absorption isotherm does not coincide completely with desorption isotherm, which shows hysteresis loop of type H3 and non-uniformity of carrier pore size. This matches feature of carbon material carrier and demonstrates that MAC does not change its pore feature after modified by this concentration of AgNO3. MAC does not block pore because of deposition of silver particle, which provides base for further study in immobilization optimization. |
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