改質黏土吸附酚類化合物之平衡與動力學

Equilibrium and Kinetic Studies on the Adsorption of Phenols from Water onto Organoclays

曹功勳(Kung-Hsuen Tsao)

指導教授 ： 莊瑞鑫

元智大學/工程學院/化學工程與材料科學學系/碩士(2002年)

摘要

無資料

關鍵字

蒙特石 ； 酚類化合物 ； 吸附 ； 固定床 ； 有機黏土

並列摘要

In this paper, the organoclay was prepared by modifying montmorillonite K30 with cetyltrimethylammounium bromide (CTAB). The sorption of phenol, m-nitrophenol, and o-cresol from single- and binary-solute solutions onto the organoclay was investigated.
Experiments of batch equilibrium and kinetics as well as fixed bed were carried out. It was shown that the sorption capacity decreased in the order m-NP > o-cresol > phenol.The sorption capacity was decreased with the polarity and solubility of phenols increased. For sorption equilibrium, the Langmuir model (LM)and Dual-sorption model (DSM) were tested to fit the sorption isotherms of single-solute systems, and the Langmuir competitive model (LCM) was used to describe bi-solute sorption systems.Thermodynamic parameters were obtained from the experiments of varying temperature (5-45 oC). It was found that a decrease in the temperature would lead to an increase in sorption capacity. It was indicated the sorption process was exothermic (DHo = -6.7~ -3.6 kJ/mol) and spontaneous (DSo > 0, DGo < 0). A simplified kinetic model was proposed to confirm the sorption mechanism.
Fixed-bed experiments were carried out as a function of type of phenols, velocity, feed concentration, and bed height. The axial dispersion equation and constant pattern wave equation were used. The results showed that exhaustion time increased with decreasing velocity and concentration, but increasing bed height. Beside, the correlations were used to calculate the axial dispersion coefficient DL, liquid-phase mass transfer kL and pore diffusion coefficient Dp.

並列關鍵字

momtmorillonite ； phenols ； adsorption ； fixed-bed ； organoclay