《Desalination》杂志刊登“铝土岩对受污染地下水中氟化物去除的研究”

作  者：M.G. Sujana, S. Anand

刊  物：《Desalination》，2011年，267卷第2-3期，222-227页

关键词：吸附；等温线；氟化物；铝土岩；温泉水；地下水

摘  要：本文采用铝土岩作为吸附剂，去除高氟地下水中的氟化物，试验使用实验室配水以及印度奥里萨邦的高氟地下水。本文通过试验，研究了接触时间、pH值、吸附剂投加量、其他共存阴离子NO₃ ^-、 SO₄^2-、CO₃^2- 和 PO₄^3-等参数对铝土岩吸附剂除氟效果的影响。铝土岩吸附前后的材料特性采用XRD、FTIR和SEM–EDX进行表征，从而探究铝土岩的吸附机理。铝土岩的吸附速率快，吸附动力学符合一级动力学方程，离子扩散速率决定动力学级数。铝土岩的吸附等温线符合Langmuir等温线方程，最大Langmuir吸附容量5.16 mg g^-1。在pH值为6，浓度范围为5-20 mg/L时，CO₃^2-相比NO₃^-、SO₄^2-和PO₄^3-等竞争离子对铝土矿除氟影响小。通过分析热力学参数(ΔH°, ΔS° 和 ΔG°)，表明铝土矿吸附氟的过程是自发的、散热的。

Fluoride removal studies from contaminated ground water by using bauxite

Authors: M.G. Sujana, S. Anand

Journal: Desalination, Volume 267, Number 2-3 (2011), 222-227

Key words: Adsorption; Isotherm; Fluoride; Bauxite; Hot water spring; Ground water

Abstract: The present study explores the feasibility of utilizing bauxite for fluoride removal from synthetic and natural fluoride bearing groundwater samples of Orissa, India. Adsorption experiments with respect to variation in time, pH, adsorbate and concentrations of other anions namely NO₃^-, SO₄^2-, CO₃^2- and PO₄^3- were carried out. Characterization of bauxite before and after fluoride adsorption was studied by XRD, FTIR and SEM–EDX to get a better insight into the mechanism of adsorption. The rate of adsorption was rapid and followed first order kinetics with intraparticle diffusion as the rate determining step. The system followed the Langmuir adsorption isotherm model with adsorption capacity of 5.16 mg g⁻¹. The competition of CO₃^2- ions for surface sites is comparatively less as compared to NO₃^-, SO₄^2- and PO₄^3- in the concentration range of 5–20 mg g⁻¹ at solution pH of 6 during fluoride adsorption. The estimated thermodynamic parameters (ΔH°, ΔS° and ΔG°) indicated that the adsorption was spontaneous and exothermic in nature.

原文链接：http://www.sciencedirect.com/science/article/pii/S001191641000679X