Using disposable iron oxide to adsorptive removal of phosphate from TFT-LCD factory
This study presents adsorptive removal of phosphate by using an amorphous iron oxide-BT-1.It is a granular (0.25-0.50 mm) byproduct which is produced by the fluidized-bed reactor Fenton (FBR-Fenton) crystallization technology. Phosphate wastewater was obtained from the Al-etching procedure of a thin film transistor-liquid-crystal display (TFT-LCD) factory in Taiwan. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), atomic adsorption spectrophotometer (AA), and surface area and porosity analyzer (BET-surface area analyzer) were used to characterize the BT-1. All the experiment trails were carded out in the nature pH of the diluted solution at 305K. Adsorption isotherm and desorptive ability were examined in this work. The equilibrium data were calculated by fitting Freundlish, Langmuir, and Temkin isotherm model. XRD analysis showed that BT-1 is an amorphous type iron oxide. The morphology was observed slightly smoother after adsorption by SEM. Phosphate adsorption has been proved by comparing with the EDS data. It was found that most of phosphorus was adsorbed rapidly initially and then reached the thermodynamics equilibrium after 24 hours. The phosphate adsorptive capacity of BT-1 is 2.03 mmole/g at the PO43-equilibrium concentration 8.23mM. It shows that the adsorption process follows the Langmuir and Ternkin adsorption isotherm. In the desorption test, it was found that less than 50％ phosphate was desorpted at an optimum condition ranged from 6.45 to 12.9 wt％ NaOH.
phosphate removal iron oxide adsorption isotherm desorption TFT-LCD
Chun-Chi CHANG Yao-Hui HUANG Lien-Tai CHO Hui-Pin CHENG Su-Ling WANG
Department of Chemical Engineering,National Cheng Kung University,Tainan City 701,Taiwan Department of Chemical Engineering,National Cheng Kung University,Tainan City 701,Taiwan;Sustainable EVER-CLEAR Environmental Engineering Corp,Taichung City,Taiwan
国际会议
西安
英文
709-715
2008-05-15（万方平台首次上网日期，不代表论文的发表时间）