| 王顺利,王秀红,周新初,艾晓杰,邱江平,李银生.沸石-纳米零价铁的制备及其对溶液中Cu2+的吸附研究[J].农业环境科学学报,2017,36(3):583-590. |
| 沸石-纳米零价铁的制备及其对溶液中Cu2+的吸附研究 |
| The preparation and application for the composite of nanoscale zero valent iron-zeolite adsorption to Cu2+ from aqueous solution |
| 投稿时间：2016-09-18 |
| DOI：10.11654/jaes.2016-1209 |
| 中文关键词: 沸石-纳米零价铁复合材料 铜离子 吸附能力 |
| 英文关键词: zeolite-nanoscale zero valent iron(Z-nZVI) Cu2+ adsorption capacity |
| 基金项目:国家自然科学基金项目（41471203） |
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| 中文摘要: |
| 采用液相还原法制备沸石-纳米零价铁复合材料，并通过添加不同质量的沸石得到不同铁与沸石比例的沸石-纳米零价铁复合材料（Z-nZVI），考查了不同比例复合材料对Cu2+的吸附效果，确定最佳铁与沸石比例为1：6，并对该比例材料、纳米零价铁与沸石进行了性状表征（包括：TEM、XRD及BET）。该比例复合材料对Cu2+的吸附动力学实验结果表明，其吸附平衡时间约为1 h；动力学方程拟合结果表明，该材料的动力学过程更符合准二级动力学方程，且平衡吸附量达到515.46 mg·g-1 Fe0；对等温吸附实验数据进行Langmuir和Freundlich拟合结果表明，Langmuir方程更适用于描述沸石-纳米零价铁对Cu2+的吸附。比较而言，沸石-纳米零价铁（1：6）对于Cu2+的吸附效果要优于纳米零价铁并远高于沸石。三因素三水平正交试验（溶液温度：25、35、45℃；pH：3、4、5 ；Z-nZVI添加量：0.1、0.14、0.21 g·40 mL-1）结果表明，铁沸石比为1：6的沸石-纳米零价铁对Cu2+的最优吸附条件为：温度45℃，pH 3，Z-nZVI添加量0.21 g·40 mL-1。上述结果表明沸石-纳米零价铁可应用于水体中Cu2+的去除。 |
| 英文摘要: |
| In this study, the composite of zeolite-nanoscale zero valent iron(Z-nZVI) was synthesized by liquid reduction and characterized by transmission electron microscopy(TEM) and X-ray diffraction(XRD). The specific surface area was determined using Brunauer-Emmett-Teller(BET) measurement. The presence of zeolite in the composite resulted in decreased aggregation of iron nanoparticles and improved the surface area. The adsorption efficiency of Cu2+ by Z-nZVI with different ratio of Fe and zeolite was investigated. The results showed that the Z-nZVI with 1:6 ratio of Fe to zeolite performed best. The adsorption kinetics of Cu2+ fitted better with pseudo-second order kinetics than with pseudo-first order kinetics. The equilibrium data were analyzed against the Langmuir and Freundlich isotherm models, which revealed that the Langmuir isotherm was the most suitable model for describing Cu2+ adsorption.The results of the three level orthogonal experiment showed that the optimal condition for Cu2+ adsorption by Z-nZVI was achieved through adding 0.21 g·40 mL-1 Z-nZVI to the solution with a pH of 3 and at a temperature of 45℃. Results support the potential use of the Z-nZVI composite for theremoval of Cu2+ from aqueous solution. |
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