• 关键词：海泡石  纳米零价铁  铜离子  锌离子

• 基金项目：公益性行业（农业）科研专项（No.201503108）；国家现代农业产业技术体系建设项目（No.CARS-46）

• 刘雪
• 1. 中国水产科学研究院渔业机械仪器研究所, 上海 200092;2. 上海海洋大学, 水产科学国家级实验教学示范中心, 上海 201306;3. 上海海洋大学, 农业部淡水水产种质资源重点实验室, 上海 201306;4. 上海海洋大学, 农业部鱼类营养与环境生态研究中心, 上海 201306

• 刘兴国
• 中国水产科学研究院渔业机械仪器研究所, 上海 200092

• 刘云飞
• 中国水产科学研究院渔业机械仪器研究所, 上海 200092

• 曹娟
• 中国水产科学研究院渔业机械仪器研究所, 上海 200092

• 曾宪磊
• 中国水产科学研究院渔业机械仪器研究所, 上海 200092

• 摘要：针对日益突出的水体重金属污染问题，采用液相还原法制备海泡石负载纳米零价铁（S-nZVI），并研究其对Cu（Ⅱ）、Zn（Ⅱ）的去除效果.同时，利用比表面积与孔径分析（BET）、透射电子显微镜（TEM）、X射线衍射（XRD）对制备出的材料进行表征，研究pH、S-nZVI投加量、重金属离子溶液初始浓度对去除率的影响，拟合S-nZVI材料去除Cu（Ⅱ）、Zn（Ⅱ）的动力学模型和吸附等温模型，并对反应后的S-nZVI进行回收及再生.结果表明，液相还原法可以成功制备出S-nZVI，且颗粒分布均匀.在60 min左右，S-nZVI对Cu（Ⅱ）、Zn（Ⅱ）的去除达到平衡.Cu（Ⅱ）、Zn（Ⅱ）的去除率随着pH值的升高而升高.当Cu（Ⅱ）、Zn（Ⅱ）溶液初始浓度为20 mg·L^-1时，最佳S-nZVI投加量分别为0.030、0.050 g，此时去除率分别为98.98%、98.97%.当Cu（Ⅱ）浓度为90 mg·L^-1时，S-nZVI材料对Cu（Ⅱ）的去除量最大，为127.57 mg·g^-1；对Zn（Ⅱ）来说，当浓度为110 mg·L^-1时去除量最大，为109.13 mg·g^-1.去除过程符合准二级动力学模型和Langmuir吸附等温模型.S-nZVI可通过外加磁场进行回收，5次再生处理后其对Cu（Ⅱ）、Zn（Ⅱ）的去除率仍维持在96.84%、80.25%.实验结果显示，S-nZVI在废水除Cu（Ⅱ）、Zn（Ⅱ）领域具有很好的应用前景.

• Abstract：With the increasingly severe problem of heavy metal contamination in water body, this paper studies the effect of removing Cu(Ⅱ) and Zn(Ⅱ) by applying sepiolite-supported nanoscale zero-valent iron (S-nZVI) that was prepared by liquid phase reduction method. The prepared materials were characterized by specific surface area and pore size analysis (BET), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The impacting factors including pH values, S-nZVI dosage and initial concentration of heavy metal ion solution were studied. The kinetic model and adsorption isotherm model of S-nZVI for removing Cu(Ⅱ) and Zn(Ⅱ) were fitted, and the reacted S-nZVI was recovered and regenerated. The results showed that the liquid phase reduction method can successfully prepare S-nZVI with uniform particle distribution. The removal of Cu(Ⅱ) and Zn(Ⅱ) by S-nZVI reached to a balance at about 60 min.The removal rates of Cu(Ⅱ) and Zn(Ⅱ) increased with pH values. When the initial concentration of Cu(Ⅱ) and Zn(Ⅱ) solution was 20 mg·L^-1, the optimal S-nZVI materials dosage were 0.030 g and 0.050 g, respectively, and the removal rates were 98.98% and 98.97%, respectively. When Cu(Ⅱ) concentration was 90 mg·L^-1, the removal capacity of Cu(Ⅱ) by S-nZVI material was the highest, which was 127.57 mg·g^-1. For Zn(Ⅱ), when its concentration was 110 mg·L^-1, the maximum removal capacity was 109.13 mg·g^-1. The removal process conformed to the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model. After the reaction was removed, S-nZVI can be recovered by applied magnetic field. The removal rate of Cu(Ⅱ) and Zn(Ⅱ) after 5 times of regeneration treatment maintained at 96.84% and 80.25%, respectively. The results show that S-nZVI has a good prospect to application in the removal of Cu(Ⅱ) and Zn(Ⅱ) for wastewater treatment.

• Key words：sepiolite  nanoscale zero-valent iron  Cu (Ⅱ)  Zn (Ⅱ)

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