Preparation of magnetic porous NiFe2O4/SiO2 composite xerogels for potential application in adsorption of Ce(IV) ions from aqueous solution

Huiqin Fu; Xingeng Ding; Chunrong Ren; Wenqi Li; Huating Wu; Hui Yang

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Preparation of magnetic porous NiFe₂O₄/SiO₂ composite xerogels for potential application in adsorption of Ce(IV) ions from aqueous solution

机译：磁性多孔NiFe _{2 O _{4 / SiO _{2 复合干凝胶的制备及其在水溶液中吸附Ce（IV）离子中的潜在应用}}}

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In this work, a novel magnetic porous adsorbent was prepared via a sol–gel method for the removal of Ce(IV) from aqueous solution. The NiFe₂O₄/SiO₂ composite xerogels were characterized using SEM, BET, FT-IR, XPS, TEM, VSM and XRD. In addition, the effects of initial concentration, amounts of adsorbents, contact time, solution pH and temperature on the adsorption of Ce(IV) were investigated via batch adsorption studies. The results verify the formation of hierarchically porous structures with a specific surface area of 1085.3 m2 g?1. The adsorption capacity for Ce(IV) at 25 °C is 114.56 mg g?1 (91.65%), the adsorption of Ce(IV) onto the composite xerogels was better described by the pseudo-second-order kinetic model, and the data fit well with the Langmuir isotherm model. Thermodynamic parameters such as standard enthalpy (ΔH0), standard entropy (ΔS0) and standard free energy (ΔG0) indicated that the adsorption of Ce(IV) onto composite xerogels was spontaneous and endothermic within the temperature range of 278–338 K. Moreover, the adsorbents showed good performance and recycling ability and could be separated by applying a magnetic field.

机译：在这项工作中，通过溶胶-凝胶法制备了一种新型的磁性多孔吸附剂，用于从水溶液中去除Ce（ IV ）。 NiFe _{2 O _{4 / SiO _{2 使用SEM，BET，FT-IR，XPS，TEM，VSM和XRD对复合干凝胶进行了表征。另外，通过分批吸附法研究了初始浓度，吸附剂数量，接触时间，溶液pH值和温度对Ce（ IV ）吸附的影响。结果证实了比表面积为1085.3 m 2 g ？1 的分层多孔结构的形成。 Ce（ IV ）在25°C下的吸附容量为114.56 mg g ？1 （91.65％），Ce（<伪二级动力学模型可以更好地描述复合材料干凝胶上的small> IV ），并且该数据与Langmuir等温线模型非常吻合。热力学参数，例如标准焓（Δ H 0 ），标准熵（Δ S ^{0 ）和标准自由能（Δ G 0 ）表明，Ce（ IV ）在278-338 K的温度范围内是自发吸热的。此外，吸附剂表现出良好的性能和再循环能力，可以通过施加磁场来分离。}}}} 展开▼

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《RSC Advances》 |2017年第27期|共11页

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Huiqin Fu; Xingeng Ding; Chunrong Ren; Wenqi Li; Huating Wu; Hui Yang;
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中图分类化学;

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Preparation of magnetic porous NiFe2O4/SiO2 composite xerogels for potential application in adsorption of Ce(IV) ions from aqueous solution

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Preparation of magnetic porous NiFe₂O₄/SiO₂ composite xerogels for potential application in adsorption of Ce(IV) ions from aqueous solution