纳米Fe3O4及Ni2+掺杂Fe3O4的制备、表征及吸附Pb(Ⅱ)的特性

引用本文: 魏世勇, 杨小洪. 纳米Fe₃O₄及Ni²⁺掺杂Fe₃O₄的制备、表征及吸附Pb(Ⅱ)的特性[J]. 无机化学学报, 2013, 29(12): 2615-2622. doi: 10.3969/j.issn.1001-4861.2013.00.377 shu

Citation: WEI Shi-Yong, YANG Xiao-Hong. Preparation, Characterization and Adsorption Characteristics for Pb(Ⅱ) of Fe₃O₄ and Ni-Doped Fe₃O₄ Nanoparticles[J]. Chinese Journal of Inorganic Chemistry, 2013, 29(12): 2615-2622. doi: 10.3969/j.issn.1001-4861.2013.00.377 shu

纳米Fe₃O₄及Ni²⁺掺杂Fe₃O₄的制备、表征及吸附Pb(Ⅱ)的特性

魏世勇 ,
杨小洪

基金项目:
国家自然科学基金(No.41261060) (No.41261060)

湖北省教育厅科学技术研究计划(No.Q20122904)资助项目。 (No.Q20122904)

摘要: 采用一种改进的共沉淀法制备了纳米磁铁矿(Fe₃O₄)及Ni²⁺掺杂磁铁矿(Ni_xFe_3-xO₄，x=0.1，0.3，0.6)，用X-射线衍射(XRD)、扫描电镜(SEM)、氮气物理性吸附、酸碱滴定等手段对产物进行了表征，用平衡吸附法研究了4种样品对Pb(Ⅱ)离子的吸附容量及吸附模型。结果表明，Fe₃O₄和3种Ni_xFe_3-xO₄均为近似球形的单相晶质纳米颗粒；与Fe₃O₄比较，Ni_xFe_3-xO₄的颗粒尺寸变小、表面电荷零点和pH＝5.0时的表面正电荷量降低；样品的孔体积、比表面积和表面分形度以及表面羟基含量都随产物中Ni²⁺掺杂量的增加而升高。4种样品对Pb(Ⅱ)的等温吸附数据均适合用Langmuir模型拟合(R²=0.9942~0.9858)，其相关系数的大小表现为：Fe₃O₄>Ni_0.1Fe_2.9O₄>Ni_0.3Fe_2.7O₄=Ni_0.6Fe_2.4O₄；Freundlich模型对样品等温吸附Pb(Ⅱ)的实验数据拟合度较低(R²=0.981 3~0.947 7)，4种样品的Freundlich相关系数的大小关系与Langmuir相关系数相反。初始pH=5.0时，Fe₃O₄，Ni_0.1Fe_2.9O₄，Ni_0.3Fe_2.7O₄和Ni_0.6Fe_2.4O₄对Pb(Ⅱ)的最大吸附容量分别为6.02，6.68，7.29和8.34 mg·g^-1。可见，Ni_xFe_3-xO₄(尤其是Ni²⁺掺杂量较高的产物)对水环境中重金属Pb(Ⅱ)的去除能力明显高于Fe₃O₄。

关键词:

纳米Fe₃O₄;Ni²⁺掺杂;表面性质;吸附;铅(Ⅱ)

English

Preparation, Characterization and Adsorption Characteristics for Pb(Ⅱ) of Fe₃O₄ and Ni-Doped Fe₃O₄ Nanoparticles

1.
Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province. Department of Chemistry andEnvironmental Engineering, Hubei University for Nationalities, Enshi, Hubei 445000, China
Received Date: 08 April 2013
Fund Project:
国家自然科学基金(No.41261060)

湖北省教育厅科学技术研究计划(No.Q20122904)资助项目。

Abstract: Nanocrystalline magnetite (Fe₃O₄) and Ni-doped magnetites (Ni_xFe_3-xO₄, x=0.1, 0.3, and 0.6) were prepared by a modified coprecipitation procedure, and their surface properties and application for the removal of Pb(Ⅱ) ions from aqueous solutions were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen physical adsorption, potentiometric titrations and batch adsorption experiments. Results show that all the samples are single-phase crystalline nanoparticles with an approximately spherical shape. Compared to Fe₃O₄, the particle size, the pHpzc value and the surface charge at pH=5.0 for Ni_xFe_3-xO₄ nanoparticles are decreased; and the pore volume, specific surface area (SSA), surface fractal dimension and the content of surface hydroxyls are increased. Langmuir correlation coefficients for Pb(Ⅱ) adsorption on the samples are fairly high (R²=0.9942~0.9858) and they follow the order: Fe₃O₄>Ni_0.1Fe_2.9O₄>Ni_0.3Fe_2.7O₄=Ni_0.6Fe_2.4O₄, and those of Freundlich model are relatively low (R²=0.9813~0.9477) and the order is opposite to Langmuirs. At pH=5.0, Langmuir adsorption capacities (qmax) of Fe₃O₄, Ni_0.1Fe_2.9O₄, Ni_0.3Fe_2.7O₄ and Ni_0.6Fe_2.4O₄ are 6.02, 6.68, 7.29, and 8.34 mg·g^-1, respectively. Compared to Fe₃O₄, Ni_xFe_3-xO₄ nanoparticles with a high content of Ni have a higher adsorption capacity for the Pb(Ⅱ) ions in aqueous solutions.

Key words:

magnetite nanoparticles;Ni-doped magnetite;surface properties;adsorption;lead(Ⅱ)

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纳米Fe₃O₄及Ni²⁺掺杂Fe₃O₄的制备、表征及吸附Pb(Ⅱ)的特性

English

Preparation, Characterization and Adsorption Characteristics for Pb(Ⅱ) of Fe₃O₄ and Ni-Doped Fe₃O₄ Nanoparticles

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