Fe3+改性类水滑石对废水中氟化物的吸附性能

Adsorption Performance of Fe3+Modified Hydrotalcite for Fluoride in Wastewater

尹波 李政 顾贵洲 于喜洋 王辉 徐习习

Bo YIN Zheng LI Guizhou GU Xiyang YU Hui WANG Xixi XU

辽宁石油化工大学 环境与安全工程学院，辽宁 抚顺 113001

School of Enviromental ＆ Safety Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China

采用共沉淀法合成两种吸附剂镁铝焙烧态水滑石（MgAl LDO）和镁铝铁焙烧态水滑石（MgAlFe LDO），并通过X射线粉末衍射（XRD）分析、扫描电子显微镜（SEM）分析、傅里叶变换红外光谱（FT?IR）分析、BET比表面积测试分析等手段对其进行了表征，同时研究了两种吸附剂对废水中F－的吸附性能；考察了金属的物质的量比、煅烧温度、F－初始质量浓度、吸附剂投加量对废水中F－去除效果的影响。结果表明，MgAlFe LDO孔结构分布均匀，拥有较大的比表面积，对废水中F－的吸附能力高于MgAl LDO；当n(Mg2+)/n(Al3+)/n(Fe3+)=3.0∶0.6∶0.4、F－初始质量浓度为20 mg/L、煅烧温度为300 ℃、MgAlFe LDO的投加量为0.4 g时，废水中F－的去除效果最佳；反应2 h后，废水中F－的去除率为98.35%。

Two adsorbents, magnesium aluminum calcined hydrotalcite (MgAl LDO) and magnesium aluminum iron calcined hydrotalcite (MgAlFe LDO), were synthesized by coprecipitation method, and characterized by X?ray powder diffraction (XRD) analysis, scanning electron microscopy (SEM) analysis, Fourier transform infrared spectroscopy (FT?IR) analysis and BET specific surface area test analysis, etc. The adsorption performance of the two adsorbents for fluoride in wastewater was also studied. The effects of the ratio of metal substances, calcination temperature, initial mass concentration of F-, and adsorbent dosage on the removal efficiency of fluoride in wastewater were investigated. The results showed that MgAlFe LDO had a uniform pore structure distribution, a large specific surface area, and a higher adsorption capacity for fluoride in wastewater than that of MgAl LDO. When n (Mg2+)/n (Al3+)/n (Fe3+)=3.0∶0.6∶0.4, the initial mass concentration of F- was 20 mg/L, the calcination temperature was 300 ℃, and the dosage of MgAlFe LDO was 0.4 g, the removal effect of fluoride in wastewater was optimal. After 2 hours of reaction, the removal rate of fluoride in the wastewater was 98.35%.

辽宁省教育厅基本科研项目(LJ212410148003);“抚顺英才计划”项目(FSYC202107006)

10.12422/j.issn.1672-6952.2024.06.001