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研究了CCTS对低浓度游离酸的吸附特性,基于吸附质-分子探针电位法,考察了吸附剂活性中心数目、游离酸种类和温度对吸附行为的影响。结果表明,在30℃时,CCTS吸附游离酸的过程,遵循单分子层机理进行吸附。吸附剂―吸附质相互作用能U制约表观吸附速率常数K,K、U大小分别为2.519×10-2,4.084×10-2,9.398×10-2L/min和7.264,7.420,7.926 kJ/mol,两者存在线性相关性,呈逐渐增大趋势。K、U大小随着活性中心数目G的增加而增大。CCTS吸附游离酸为吸热过程,吸附表观活化能Ea为33.98 kJ/mol。3种类型游离酸K、U的大小顺序为:HClO4>HNO3>H2SO4,吸附分维数Dw分别为1.384、1.567、1.911,Dw值越大,导致表观吸附速率常数降低。
The adsorption properties of CCTS to low concentration of free acid were studied. Based on the adsorptive mass - molecular probe potential method, the influence of the number of active sites, free acid species and temperature on the adsorption behavior was investigated. The results showed that CCTS adsorbed free acid at 30 ℃ and adsorbed by monolayers. Adsorbent - adsorbate interaction U constraints the apparent adsorption rate constants K, K, U were 2.519 × 10-2,4.084 × 10-2,9.398 × 10-2L / min and 7.264,7.420,7.926 kJ / mol, there is a linear correlation between the two, showing a gradual upward trend. K, U size increases with the number of active centers G increases. The CCTS adsorption of free acid was an endothermic process, and the apparent activation energy Ea was 33.98 kJ / mol. The order of the three types of free acids, K, U, is as follows: HClO4> HNO3> H2SO4. The adsorption fractal dimension Dw is 1.384, 1.567 and 1.911, respectively. The larger the Dw value, the lower the apparent adsorption rate constant.