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利用水合纳米结构铁(III)-钛(IV)二元混合氧化物从水溶液中去除砷。

Arsenic removal using hydrous nanostructure iron(III)-titanium(IV) binary mixed oxide from aqueous solution.

作者信息

Gupta Kaushik, Ghosh Uday Chand

机构信息

Department of Chemistry, Presidency College, 86/1 College Street, Kolkata, West Bengal 700073, India.

出版信息

J Hazard Mater. 2009 Jan 30;161(2-3):884-92. doi: 10.1016/j.jhazmat.2008.04.034. Epub 2008 Apr 18.

Abstract

The synthetic bimetal iron(III)-titanium(IV) oxide (NHITO) used was characterized as hydrous and nanostructured mixed oxide, respectively, by the Föurier transform infra red (FTIR), X-ray diffraction (XRD) pattern and the transmission electron microscopic (TEM) image analyses. Removal of As(III) and As(V) using the NHITO was studied at pH 7.0 (+/-0.1) with variation of contact time, solute concentration and temperature. The kinetic sorption data, in general, for As(III) described the pseudo-first order while that for As(V) described the pseudo-second order equation. The Langmuir isotherm described the equilibrium data (303 (+/-1.6)K) of fit was well with the Langmuir model. The Langmuir capacity (q(m), mg g(-1)) value of the material is 85.0 (+/-4.0) and 14.0 (+/-0.5), respectively, for the reduced and oxidized species. The sorption reactions on NHITO were found to be endothermic and spontaneous, and took place with increasing entropy. The energy (kJ mol(-1)) of sorption for As(III) and As(V) estimated, respectively, is 9.09 (+/-0.01) and 13.51 (+/-0.04). The sorption percentage reduction of As(V) was significant while that of As(III) was insignificant in presence of phosphate and sulfate. The fixed bed NHITO column (5.1 cm x 1.0 cm) sorption tests gave 3.0, 0.7 and 4.5L treated water (As content < or = 0.01 mg L(-1)) from separate As(III) and As(V) spiked (0.35+/-0.02 mg L(-1)) natural water samples and from high arsenic (0.11+/-0.01 mg L(-1)) ground water, respectively when inflow rate was (0.06 L h(-1)).

摘要

所使用的合成双金属铁(III)-二氧化钛(NHITO)通过傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)图谱以及透射电子显微镜(TEM)图像分析,分别被表征为含水和纳米结构的混合氧化物。在pH 7.0(±0.1)条件下,研究了NHITO对As(III)和As(V)的去除情况,考察了接触时间、溶质浓度和温度的变化。总体而言,As(III)的动力学吸附数据符合准一级方程,而As(V)的动力学吸附数据符合准二级方程。朗缪尔等温线描述了平衡数据(303(±1.6)K),与朗缪尔模型拟合良好。该材料对还原态和氧化态物种的朗缪尔容量(q(m),mg g⁻¹)值分别为85.0(±4.0)和14.0(±0.5)。发现NHITO上的吸附反应是吸热且自发的,并且伴随着熵的增加。估算出的As(III)和As(V)的吸附能量(kJ mol⁻¹)分别为9.09(±0.01)和13.51(±0.04)。在磷酸盐和硫酸盐存在的情况下,As(V)的吸附百分比降低显著,而As(III)的吸附百分比降低不显著。固定床NHITO柱(5.1 cm×1.0 cm)吸附试验表明,当进水流量为(0.06 L h⁻¹)时,分别从单独添加了As(III)和As(V)(0.35±0.02 mg L⁻¹)的天然水样以及高砷(0.11±0.01 mg L⁻¹)地下水中得到了3.0、0.7和4.5 L处理后水(As含量≤0.01 mg L⁻¹)。

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