Absorption into silicone rubber membranes from powders and aqueous solutions
Absorption into silicone rubber membranes from powders and aqueous solutions
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DOI：
10.1016/s0378-5173(02)00538-0
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发表时间：
2003-01-02
影响因子：
5.8
通讯作者：
Bunge, AL
中科院分区：
文献类型：
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作者：
McCarley, KD;Bunge, AL
本研究比较了3-和4-氰基苯酚（CP）水溶液和纯粉末在硅橡胶（SR）膜中的吸附速率和量。SR膜直接浇铸到硒化锌衰减全反射（ATR）晶体，然后安装在傅里叶变换红外（FTIR）光谱仪。将CP从足以完全覆盖膜表面的水溶液或粉末提供给SR膜。通过C = N伸缩的IR吸收测定膜中与晶体界面处的CP浓度。通过提取和提取物的UV吸收测量来确定稳态下SR膜中CP的量。发现SR膜中CP的浓度弱依赖于水溶液的浓度。用纯粉末平衡的SR膜中CP的量与CP饱和溶液基本相同。3和4-CP的扩散系数（分别为2.8 +/-0.2和2.5 +/-0.6 x 10（-7）cm（2）s（-1））无统计学差异。CP在SR膜中的吸附速率从粉末和水溶液中几乎相同，表明从粉末到膜的传质速率大于0.04cm·h（-1）。(C)2002 Elsevier Science B.V.保留所有权利。
This study compared the rate and amount of absorption from aqueous solutions and pure powders of 3- and 4-cyanophenol (CP) into silicone rubber (SR) membranes. SR membranes were cast directly onto a zinc-selenide attenuated total reflectance (ATR) crystal, which was then mounted on a Fourier transform infrared (FTIR) spectrometer. CP was presented to the SR membrane from aqueous solutions or powders sufficient to completely cover the membrane surface. The concentration of CP in the membrane at the interface with the crystal was determined by IR absorption of the C=N stretch. The amount of CP in the SR membrane at steady state was determined by extraction and UV absorption measurements of the extract. The concentration of CP in SR membranes was found to depend weakly on the concentration of the aqueous solution. The amount of CP in SR membranes equilibrated with pure powders was essentially the same as for the CP-saturated solutions. Diffusion coefficients for 3 and 4-CP (2.8+/-0.2 and 2.5+/-0.6 x 10(-7) cm(2) s(-1), respectively) were not statistically different. The absorption rate of CP into SR membranes was almost the same from the powder and aqueous solution indicating that the rate of mass transfer from the powder to membrane was larger than 0.04 cm h(-1). (C) 2002 Elsevier Science B.V. All rights reserved.