An Experimental Study of Fluoride Removal from Wastewater by Mn-Ti Modified Zeolite

吸附 沸石 吸附 弗伦德利希方程 化学吸附 氟化物 朗缪尔 斜发沸石 傅里叶变换红外光谱 材料科学 废水 离子交换 无机化学 化学 化学工程 分析化学(期刊) 离子 色谱法 催化作用 物理化学 环境工程 有机化学 工程类
作者
Bo Yang,Guirong Sun,Bingxu Quan,Jiawei Tang,Chunhui Zhang,Chaomin Jia,Yuanhui Tang,Xinling Wang,Meng‐Meng Zhao,Wenqian Wang,Binhu Xiao
出处
期刊:Water [Multidisciplinary Digital Publishing Institute]
卷期号:13 (23): 3343-3343 被引量:9
标识
DOI:10.3390/w13233343
摘要

The emerging interest in fluoride-removal from wastewater has attracted attention to zeolite since it has been considered as a natural adsorbent. However, the fluoride-removal efficiency of natural zeolite is generally low. As part of the effort to improve the zeolite adsorption efficiency, we have produced and tested the Mn-Ti modified zeolite. In the current work, the material preparation is discussed, and prepared materials were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy, and Fourier transform infrared (FTIR) spectra. Both static and dynamic experiments were conducted to examine the effects of independent variables. In the static adsorption section, sensitivity analysis experiments were conducted for independent variables, such as adsorbent dosage, pH, temperature, and competitive ions. The maximum adsorption capacity is 2.175 mg/g, which was obtained at PH = 7, temperature = 25 °C, and initial fluoride concentration = 10 mg/L. For adsorption kinetics, both Lagergren and Pseudo-second order models predict the experiments very well, which probably demonstrates that the current process is a combination of physical sorption and chemisorption. For adsorption isotherms, the Freundlich model performs better than the Langmuir model since it is usually applied to illustrate adsorption on inhomogeneous surfaces. In the dynamic adsorption section, sensitivity analysis experiments were also conducted for independent variables, such as adsorbent thickness, flow velocity, initial fluoride concentration, and PH. Additionally, the adsorption mechanism is also discussed. The main reason is the hydrated metal fluoride precipitate formation. As we know, the current work provides the first quantified comparison of the natural zeolite and the Mn-Ti modified zeolite regarding fluoride-removal efficiency.
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