聚合羟基磷酸铁对土壤中镉和铅的固定（英文）
发布时间：2018-10-10 13:02
【摘要】：利用二氧化钛生产过程中产生的富含硫酸亚铁的副产物在碱性条件下制备聚合羟基磷酸铁(PHFP),用于固定土壤中的铅和镉。利用傅里叶变换红外光谱和X射线衍射分析所制备聚合羟基磷酸铁的结构特征;采用改进的Tessier连续提取法并模拟酸雨淋溶以评价土壤中镉和铅的固定效果。结果表明,羟基磷酸铁是一种含有复杂OH—Fe—P结构的多聚物,主要由Fe_6(OH)_5(H_2O)_4(PO_4)_4(H_2O)_2和Fe_25(PO_4)_(14)(OH)_(24)组成。当其以4%的比例加入土壤中,土壤中DTPA提取态镉和铅的去除率分别达33%和45%,水溶态镉和铅的去除率分别降低了56%和58%。镉和铅的固定是由于水溶态、交换态和碳酸盐结合态转化为铁锰氧化物结合态、有机结合态和残渣态。模拟酸雨淋溶下,采用羟基磷酸铁修复后土壤中镉和铅的释放量较修复前分别下降了53%和52%。结果表明该羟基磷酸铁具有修复镉和铅污染土壤的应用潜力。
[Abstract]:The polyhydroxy-ferric phosphate (PHFP),) was prepared from the by-product rich in ferrous sulfate from titanium dioxide production in alkaline condition for the purpose of immobilization of lead and cadmium in soil. The structural characteristics of polymeric ferric hydroxyl phosphate prepared by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were analyzed, and the modified Tessier method was used to evaluate the fixation effect of cadmium and lead in soil by simulated acid rain leaching. The results show that ferric hydroxyl phosphate is a kind of polymer with complex OH-Fe-P structure, which is mainly composed of Fe_6 (OH) _ 5 (H _ 2O) _ 4 (PO_4) _ 4 (H _ 2O) _ 2 and Fe_25 (PO_4) _ (14) (OH) _ (24). When it was added to the soil at a ratio of 4%, the removal rates of cadmium and lead extracted by DTPA reached 33% and 45%, respectively, and the removal rates of water-soluble cadmium and lead decreased by 56% and 58%, respectively. The immobilization of cadmium and lead is due to the water-soluble state, exchange state and carbonate bound state transformed into Fe-Mn oxide bound state, organic bound state and residue state. After simulated acid rain leaching, the release of cadmium and lead decreased by 53% and 52% respectively after the treatment with ferric hydroxyl phosphate. The results showed that the hydroxy ferric phosphate had the potential of remediation of cadmium and lead contaminated soil.
【作者单位】： 中南大学冶金与环境学院;中南大学国家重金属污染防治工程技术研究中心;化工部长沙设计研究院;
【基金】：Project(2012GS430203)supported by Science and Technology Program for Public Wellbeing,China Project(51504299)supported by the National Natural Science Foundation of China Project(2015WK3016)supported by Science and Technology Program of Hunan Province,China
【分类号】：X53
本文编号：2261872
[Abstract]:The polyhydroxy-ferric phosphate (PHFP),) was prepared from the by-product rich in ferrous sulfate from titanium dioxide production in alkaline condition for the purpose of immobilization of lead and cadmium in soil. The structural characteristics of polymeric ferric hydroxyl phosphate prepared by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were analyzed, and the modified Tessier method was used to evaluate the fixation effect of cadmium and lead in soil by simulated acid rain leaching. The results show that ferric hydroxyl phosphate is a kind of polymer with complex OH-Fe-P structure, which is mainly composed of Fe_6 (OH) _ 5 (H _ 2O) _ 4 (PO_4) _ 4 (H _ 2O) _ 2 and Fe_25 (PO_4) _ (14) (OH) _ (24). When it was added to the soil at a ratio of 4%, the removal rates of cadmium and lead extracted by DTPA reached 33% and 45%, respectively, and the removal rates of water-soluble cadmium and lead decreased by 56% and 58%, respectively. The immobilization of cadmium and lead is due to the water-soluble state, exchange state and carbonate bound state transformed into Fe-Mn oxide bound state, organic bound state and residue state. After simulated acid rain leaching, the release of cadmium and lead decreased by 53% and 52% respectively after the treatment with ferric hydroxyl phosphate. The results showed that the hydroxy ferric phosphate had the potential of remediation of cadmium and lead contaminated soil.
【作者单位】： 中南大学冶金与环境学院;中南大学国家重金属污染防治工程技术研究中心;化工部长沙设计研究院;
【基金】：Project(2012GS430203)supported by Science and Technology Program for Public Wellbeing,China Project(51504299)supported by the National Natural Science Foundation of China Project(2015WK3016)supported by Science and Technology Program of Hunan Province,China
【分类号】：X53
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