Adsorption of Dye from Wastewater by Zeolites Synthesized from Fly Ash:Kinetic and Equilibrium Studies  

由飞灰合成的沸石吸附废水中染料的动态平衡(英文)

作　　者：王春峰 李健生 王连军 孙秀云 黄佳佳 

机构地区：[1]School of Chemical Engineering,Nanjing University of Science and Technology

出　　处：《Chinese Journal of Chemical Engineering》2009年第3期513-521,共9页中国化学工程学报（英文版）

基　　金：Supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (20060288008);the Cultivation Fund of the Key Scientific and Technical Innovation Project,Ministry of Education of China (708049)

摘　　要：The removal performance of a basic dye, methylene blue (MB), in aqueous solution was investigated by adsorption process on single-phase and high-crystalline zeolite A (FA-ZA) and X (FA-ZX). Both adsorbents FA-ZA and FA-ZX were synthesized from fly ash prepared aluminosilicate gel followed by the hydrothermal treatment at 100°C with the control of Si/Al molar ratio, respectively. The properties of the synthetic zeolites and commercial grade zeolites, such as thermal stability, elemental composition, and cation exchange capacity, were investigated for comparison. Batch method was used to study the influential parameters, such as initial pH value of the solution, temperatures, and adsorbents dosage, on the adsorption process. The experimental data were well fitted by Ho’ pseudo-second-order model and liquid film diffusion model. The suitability of Langmuir and Freundlich isotherms to the equilibrium data was investigated in the solid-liquid system while the Langmuir model produces the best re-sults. Thermodynamic data (△H, △S, and △G) corresponding to the MB uptake were evaluated from the Langmuir model. In all the adsorption experiments, the adsorption capacity followed the order as follows: FA-ZX > FA-ZA. In addition, attempts were also made to regenerate the adsorbents.The removal performance of a basic dye, methylene blue （MB）, in aqueous solution was investigated by adsorption process on single-phase and high-crystalline zeolite A （FA-ZA） and X （FA-ZX）. Both adsorbents FA-ZA and FA-ZX were synthesized from fly ash prepared aluminosilicate gel followed by the hydrothermal treatment at 100°C with the control of Si/Al molar ratio, respectively. The properties of the synthetic zeolites and commercial grade zeolites, such as thermal stability, elemental composition, and cation exchange capacity, were investigated for comparison. Batch method was used to study the influential parameters, such as initial pH value of the solution, temperatures, and adsorbents dosage, on the adsorption process. The experimental data were well fitted by Ho’ pseudo-second-order model and liquid film diffusion model. The suitability of Langmuir and Freundlich isotherms to the equilibrium data was investigated in the solid-liquid system while the Langmuir model produces the best re-sults. Thermodynamic data （△H, △S, and △G） corresponding to the MB uptake were evaluated from the Langmuir model. In all the adsorption experiments, the adsorption capacity followed the order as follows： FA-ZX 〉 FA-ZA. In addition, attempts were also made to regenerate the adsorbents.

关 键 词：fly ash ZEOLITE DYE ADSORPTION KINETIC 

分 类 号：X703[环境科学与工程—环境工程]