| 纳米磁性磷酸二氢钙对Cd的吸附、回收与再生 |
| 摘要点击 1740 全文点击 759 投稿时间：2018-08-02 修订日期：2018-10-31 |
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| 中文关键词 磁性 磷酸二氢钙 纳米 Cd2+ 吸附 |
| 英文关键词 magnetic calcium dihydrogen phosphate nanoparticles Cd2+ adsorption |
| 作者 | 单位 | E-mail | | 李玉娇 | 西南大学资源环境学院, 农村清洁工程重庆市工程研究中心, 重庆 400716 | 1170742896@qq.com | | 杨志敏 | 西南大学资源环境学院, 农村清洁工程重庆市工程研究中心, 重庆 400716 | bear@swu.edu.cn | | 陈玉成 | 西南大学资源环境学院, 农村清洁工程重庆市工程研究中心, 重庆 400716 | | | 黄磊 | 西南大学资源环境学院, 农村清洁工程重庆市工程研究中心, 重庆 400716 | | | 唐海燕 | 西南大学资源环境学院, 农村清洁工程重庆市工程研究中心, 重庆 400716 | |
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| 中文摘要 |
| 以Ca（H2PO4）2、铁盐与亚铁盐为原料，采用共沉淀法制备成纳米磁性材料Ca（H2PO4）2@Fe3O4（NMCDP），研究其对Cd2+的吸附、回收与再生效果.透射电镜（TEM）、红外光谱（FTIR）、X射线衍射（XRD）显示，NMCDP粒径约60 nm，稳定性良好，饱和磁化强度为30.9 emu·g-1.吸附动力学表明，NMCDP对Cd2+的吸附1 h之内即可达到平衡，符合准二级动力学模型.吸附热力学表明，NMCDP对Cd2+的吸附符合Langmuir与Freundlich等温吸附模型，最大吸附量为142.50 mg·g-1.在pH值由2增加到3时，吸附量随溶液初始pH值的升高而增加，当pH值大于3后，逐渐保持稳定；溶液中共存离子Na+、Mg2+、Cu2+对材料吸附Cd2+均有一定的影响，影响程度Cu2+ > Mg2+ > Na+.采用0.01 mol·L-1 HCl与EDTA-Na2均可解吸出部分吸附的Cd2+，以EDTA-Na2解吸率较高，达到68%，从而实现NMCDP的再生. |
| 英文摘要 |
| In order to improve the adsorption-separation of Cd2+ in water treatment, magnetic Fe3O4 coated Ca(H2PO4)2 nanoparticles (NMCDP) were developed by coprecipitation. The properties of these nanoparticles were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and magnetization curves. Experiments were carried out to investigate the effect of adsorption, reclaiming, and regeneration. The results showed that NMCDP was a stable material with a particle size of 60 nm and a saturation magnetization of 30.9 emu·g-1. The adsorption rate of Cd2+ by NMCDP was fast, and adsorption equilibrium could be achieved within 1 hour. The kinetic data were well fitted by a pseudo-second-order model, and the isotherm adsorption data agreed with the Langmuir and Freundlich model, with a maximum adsorption capacity of 142.50 mg·g-1. The adsorption capacity of Cd2+ was affected by the pH and increased when the pH was increased from 2 to 3, while with continued increase of the pH of the solution, the adsorption capacity gradually became stable. The coexisting ions in the solution had an effect on the adsorption of Cd2+, especially the divalent cation Cu2+. The NMCDP could be regenerated by using 0.01 mol·L-1 HCl and EDTA-Na2, and the results indicated that it could be recycled with a desorption rate of 68% by EDTA-Na2 solution. |
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