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膨胀石墨对有机化合物的吸附 总被引:8,自引:0,他引:8
研究了在水溶液中膨胀石墨对部分极性有机化合物的吸附特性,研究了有机物的极性、粘度、分子尺寸,溶解度、浓度和吸附剂比表面积等因素对吸附量的影响。 相似文献
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建立了活性炭纤维填充床内多组分竞争吸附传质动力学模型 ,采用正交配置方法求解数学模型以预测突破曲线 ,从理论上探讨了竞争吸附平衡及吸附质在填充床内的轴向弥散、纤维内扩散和纤维外对流传质等因素对强、弱吸附组分突破曲线的影响。在间歇和填充床吸附器内进行了脱除水溶液中酚类化合物的实验 ,测定了活性炭纤维吸附水溶液中苯酚和氯代苯酚的吸附等温线 (间歇吸附 )以及苯酚和氯代苯酚在活性炭纤维填充床内竞争吸附时的突破曲线 ,并与模型计算值进行了比较。结果表明 ,吸附质在活性炭纤维内扩散和纤维外对流传质阻力不是填充床内吸附过程的控制步骤 ,而轴向弥散影响显著 ,不可忽略 相似文献
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通过后交联反应,用乙酰苯胺修饰氯甲基化的低交联大孔聚苯乙烯-二乙烯(氯球),合成了一种超高交联吸附树脂ZH-05。用活性炭GAC和Amberlite XAD-4树脂作为参照,测试了ZH-05吸附树脂对2,4-二氯苯酚的吸附性能。讨论了静态平衡吸附行为和化学吸附特征的证实。结果表明:吸附等温线都能用Langmu ir方程很好的拟合,且2,4-二氯苯酚在ZH-05吸附树脂上的吸附是一个吸热过程,吸附量随吸附温度的升高而增加,和活性炭一样,ZH-05树脂对水溶液中2,4-二氯苯酚的吸附过程中同时存在着物理吸附和化学吸附。 相似文献
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活性炭纤维电吸附处理含盐溶液吸附特性研究 总被引:2,自引:0,他引:2
以活性炭纤维为电极材料处理NaCl模拟水,研究了电吸附过程中电极电压、流量、含盐量等对脱盐效果的影响,同时分析了电吸附对水溶液中离子的吸附动力学特性,并以吸附等温线探讨双电层对水溶液中离子的吸附能力。结果表明,对于特定的电吸附装置,当电源施加电压为2.2 V,304不锈钢板的极板电压为1.77 V,流量为15mL/min时,电吸附的平均脱盐率为41.16%。电吸附过程符合Langmuir单分子层吸附等温模型,施加电压为2.2 V时,Langmuir吸附常数为0.088,饱和吸附容量为5.84 mg/g。准一级反应动力学模型、Elovich方程、二级反应动力学模型拟合程度均不高。相比较,Elovich方程拟合效果较好。 相似文献
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姚春才 《中国化学工程学报》2004,12(2):297-301
Three adsorption rate models are derived for multicomponent adsorption systems under either pore diffusion or surface diffusion control. The linear driving force (LDF) model is obtained by assuming a parabolic intraparticle concentration profile. Models I and Ⅱ are obtained from the parabolic concentration layer approximation. Examples are presented to demonstrate the usage and accuracy of these models. It is shown that Model I is suitable for batch adsorption calculations and Model Ⅱ provides a good approximation in fixed-bed adsorption processes while the LDF model should not be used in batch adsorption and may be considered acceptable in fixed-bed adsorption where the parameter Ti is relatively large. 相似文献
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Conventional methods for the characterization of adsorption systems (determination of equilibrium and kinetic parameters) have been discussed. It is shown that the kinetic parameters determined by conventional methods are completely inconsistent with the equilibrium parameters. This inconsistency is due to the application of completely different models for equilibrium and kinetic study. In the present study adsorption is viewed as a Langmuir type physico‐chemical reversible process and a three‐parameter model is proposed which describes an adsorption system from both equilibrium and kinetic viewpoints. The model satisfactorily describes the kinetic and the equilibrium data reported by previous authors. 相似文献
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污泥含炭吸附剂对甲苯的吸附性能研究 总被引:2,自引:1,他引:1
采用改进的ZnCl2化学活化法制备污泥含炭吸附剂,利用X射线能谱仪、X射线光电子能谱仪、傅里叶变换红外光谱仪等对其结构进行表征。并采用动态吸附法对甲苯废气的吸附特性进行研究。结果表明,污泥含炭吸附剂对中低浓度甲苯(2700mg·m-3)具有很好的吸附能力,其对甲苯的吸附容量随着甲苯进口浓度的增加而增大,随着吸附温度的升高而降低,随着进气流量的减小而增大;在吸附温度为20℃,气体流量为500mL·min-1(停留时间为0.424s),甲苯浓度为2700mg·m-3时,甲苯的饱和吸附容量为150.0mg·g-1;研究表明污泥含炭吸附剂对甲苯的吸附以物理吸附为主,并具有一定的化学吸附和催化氧化作用,其实验结果与Langmuir方程吻合较好。该吸附剂可在常温和有机物浓度较低的条件下用来部分替代活性炭使用。 相似文献
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《分离科学与技术》2012,47(5):675-688
Abstract Adsorption characteristics of cresol isomers in adsorption chromatography were investigated in a system where the binary eluent containing ethyl acetate as a modifier in n?hexane was used. The method of moments was used to estimate the equilibrium constant and the rate parameters. The agreement between the experimental and theoretical results calculated by the orthogonal collocation method was excellent. The equilibrium constant and rate parameters for each cresol were empirically correlated with eluent composition. As the eluent composition increased, the retention time and the front of the response curve became faster and sharper, respectively. By using the modifier in a weak solvent, mixtures of o-/m?cresols and o-/p?cresols were easily separated whereas that of m-/p?cresols was not. The values on the scale of axial eddy dispersion were much larger than those of the gas system. For o?cresol, these values diminished with increasing eluent composition, while for m? and p?cresols the trend was reversed. For all systems, both intraparticle mass transfer and axial dispersion were dominant. 相似文献
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吸附树脂的制备及吸附蛋白质的研究 总被引:1,自引:0,他引:1
本文用醇钠活化球状聚乙烯醇颗粒,Williamson醚化法制得了大孔径的吸附树脂。以牛血清白蛋白(BSA)为模型蛋白,研究了蛋白质在多孔吸附树脂表面的吸附行为。通过测定蛋白质的吸附等温线,并用线性最小二乘法对曲线进行拟合,发现蛋白质在疏水吸附树脂的吸附等温线可用Langmuir方程描述。 相似文献