碳包覆磁性镍纳米粒子对亚甲基蓝的吸附性能*

doi:10.11901/1005.3093.2014.564

材料研究学报

2015, Vol. 29

Issue (9): 663-670 DOI: 10.11901/1005.3093.2014.564

本期目录 | 过刊浏览

碳包覆磁性镍纳米粒子对亚甲基蓝的吸附性能*

李冉冉¹,黄昊¹,董星龙¹(

),王永辉¹,于洪涛²,全燮²,JUNG Youngguan³

1. 大连理工大学材料科学与工程学院三束材料改性教育部重点实验室大连 116024
2. 大连理工大学环境与生命学院工业生态与环境工程教育部重点实验室大连 116024
3. Department of Mechanical Engineering, Kumoh National Institute of Technology, Gumi, South Korea

Adsorption Performance of Methylene Blue onto Nanoparticles of Carbon-Encapsulated Magnetic Nickel

Ranran LI¹,Hao HUANG¹,Xinglong DONG^1,^**(

),Yonghui WANG¹,Hongtao YU²,Xie QUAN²,Youngguan JUNG³

1. Key Laboratory of Materials Modification by Laser, Ion, and Electron Beam, Ministry of Education, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
2. Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
3. Department of Mechanical Engineering, Kumoh National Institute of Technology, Gumi, South Korea

引用本文:

李冉冉,黄昊,董星龙,王永辉,于洪涛,全燮,JUNG Youngguan. 碳包覆磁性镍纳米粒子对亚甲基蓝的吸附性能*[J]. 材料研究学报, 2015, 29(9): 663-670.
Ranran LI, Hao HUANG, Xinglong DONG, Yonghui WANG, Hongtao YU, Xie QUAN, Youngguan JUNG. Adsorption Performance of Methylene Blue onto Nanoparticles of Carbon-Encapsulated Magnetic Nickel[J]. Chinese Journal of Materials Research, 2015, 29(9): 663-670.

全文: PDF(2002 KB) HTML

摘要:

采用直流电弧等离子体法在甲烷气氛中蒸发块体金属镍, 原位合成了核/壳型碳包覆镍纳米粒子(Ni@C NPs)。在透射电子显微镜下可见明显的包覆结构, 以镍单质金属为核心, 表面包覆着厚度为3-5 nm的石墨碳层。根据N₂吸附等温线计算出BET比表面积为38.82 m²g^-1。用双氧水对其表面进行改性处理, 实现了表面含氧官能团的功能化, 改善了表面碳的浸润性而提高亲水性, 作为吸附剂可用于染料亚甲基蓝的吸附。系统研究了吸附时间、初始浓度和pH值对吸附量的影响。采用准一级和准二级动力学模型研究了动力学, 用Langmuir和Freundlich模型拟合分析了吸附等温线。进行了5个循环的吸脱附循环再利用实验, 之后收集粉体吸附剂, 表明回收率为69.4%。用外加磁场进行的碳包覆镍纳米粒子分离研究的结果表明, 用磁分离技术进行吸附剂的回收与再利用是一种简单而高效的方法。

关键词 ：复合材料, 碳包覆镍纳米粒子, 吸附, 亚甲基蓝, 磁分离

Abstract：

Nanoparticles of carbon encapsulated nickel (Ni@C NPs) were in-situ synthesized by direct current arc-discharge plasma method through evaporating pure Ni in methane atmosphere. Transmission electron microscopy observation revealed that the nanoparticles (Ni@C NPs) exhibited an encapsulation structure with Ni metal as core and carbon 3-5 nm in thickness as shell. The BET surface area of the prepared Ni@C NPs is 38.82 m²g^-1according to N₂adsorption-desorption isotherm. Surface modification with hydrogen peroxide was carried to graft oxygen-containing groups on carbon, which can improve the wettability and hydrophilicity of the Ni@C NPs. Then the effect of contact time, adsorption time and pH values on the adsorption of methylene blue was systematically investigated with the surface modified Ni@C NPs as adsorbent. The adsorption kinetics was analyzed with pseudo-first-order and pseudo-second-order models and the adsorption isotherm of methylene blue onto Ni@C NPs was fitted by Langmuir and Freundlich models. In addition, the result of recycling experiments for 5 cycles showed that a recovery rate 69.4% for the adsorbent could be reached. Furthermore, results of trial separation of Ni@C NPs by applied magnetic fields show that the magnetic field assisted separation technology is efficient means for the recycling and reuse of this adsorbent.

Key words： composite carbon coated nickel nanoparticles adsorption methylene blue magnetic separation

收稿日期: 2014-10-08

基金资助:* 国家重点基础研究发展计划2011CB936002和国家自然科学基金51271044、51331006、51171033资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.564 或 https://www.cjmr.org/CN/Y2015/V29/I9/663

图1 碳包覆镍纳米粒子的HRTEM像和XRD谱

图2 改性前后碳包覆镍纳米粒子的傅里叶红外光谱图

图3 改性前后碳包覆镍纳米粒子的Zeta电位随pH的变化曲线

图4 改性前后碳包覆镍纳米粒子的分散性

图5 亚甲基蓝初始浓度对去除率和吸附量的影响

图6 pH变化对吸附的影响

图7 准一级动力学和准二级动力学对碳包覆镍纳米粒子吸附MB拟合

表1 用准一级动力学和准二级动力学对碳包覆镍纳米粒子吸附MB拟合结果参数

图8 用Langmuir和Freundlich模型对碳包覆镍纳米粒子吸附MB拟合

表2 碳包覆镍纳米粒子吸附MB的等温线参数

表3 与已报道吸附剂对亚甲基蓝吸附量的比较

图9 碳包覆镍纳米粒子的吸脱附循环性能

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