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以胶磷矿中氟磷灰石为晶种,外加Ca2+、F~–源,通过磷灰石晶体加大生长的方式去除水中低浓度可溶性无机磷。实验考察了不同反应物组合、反应物浓度、溶液pH值、共存离子等因素对除磷效果的影响,并通过扫描电镜、透射电镜、热分析和红外光谱对胶磷矿除磷前后样品进行表征,查证胶磷矿固磷的机制。结果表明,磷灰石、Ca2+、F~–三者共存除磷性能最佳,其中添加Ca2+对除磷效率有显著的增强作用,低浓度F~–对提高除磷速率影响不大,可通过提高Ca2+浓度替代外加F~–源的作用。当溶液中磷初始浓度为2 mg/L、pH值>6、Ca2+浓度不低于30 mg/L时,处理后残余磷浓度低于0.05 mg/L,满足地表水环境质量Ⅱ类标准。
Abstract：Collophanite fluorapatite particles were prepared as seed crystals with Ca2+ and F~– ions, which were used to deeply purify low-concentration soluble inorganic phosphorus in water. The effects of combined reactants, reactant concentration, solution pH value and coexisting ions on the removal efficiency of phosphorus in water were investigated. To characterize the properties and clarify the mechanism of collophanite to remove soluble phosphates in water, the samples before and after pickling and phosphorus removal were characterized by scanning electron microscopy, transmission electron microscopy, thermoanalysis and Fourier transform infrared spectroscopy. Collophanite fluorapatite with calcium and fluorine exhibits the maximum phosphorus removal performance. The addition of Ca2+ ions significantly enhances the phosphorus removal efficiency, and F~– ions with a low concentration have a slight effect on the phosphorus removal efficiency. Therefore, F~– ions can be replaced by Ca2+ ions. When the initial concentration of phosphorus is 2 mg/L, pH value is > 6, and Ca2+ ions concentration is > 30 mg/L, the residual phosphorus concentration after the treatment is lower than 0.05 mg/L, thus meeting the Class Ⅱ standard of environmental quality of water resource.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20200967
中图分类号:X703
引用信息:
[1]汝琳琳,陈天虎,邹雪华,等.胶磷矿氟磷灰石对水中低浓度磷的去除作用[J].硅酸盐学报,2021,49(08):1776-1784.DOI:10.14062/j.issn.0454-5648.20200967.
基金信息:
国家自然科学基金项目(41072035,41702043)
2021-07-15
2021-07-15
2021-07-15