Efficient removal of organic pollutants from aqueous media using newly synthesized polypyrrole/CNTs-CoFe2O4 magnetic nanocomposites
Efficient removal of organic pollutants from aqueous media using newly synthesized polypyrrole/CNTs-CoFe2O4 magnetic nanocomposites
复制标题
使用新合成的聚吡咯/CNTs-CoFe2O4磁性纳米复合材料有效去除水介质中的有机污染物
DOI：
10.1016/j.cej.2017.02.037
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发表时间：
2017-05-15
影响因子：
15.1
通讯作者：
He, Fu
中科院分区：
文献类型：
--
作者：
Li, Xiaoli;Lu, Haijun;He, Fu
本研究制备了聚吡咯/CNTs-CoFe2O4磁性纳米杂化材料（CNTs-CoFe2O4@PPy），并将其作为吸附剂和催化剂用于去除阴离子和阳离子染料。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、元素分析、BET比表面积、傅里叶变换红外光谱（FTIR）和振动样品磁强计（VSM）对杂化材料进行了表征。以甲基蓝（MB）、甲基橙子（MO）和酸性品红（AF）等阴离子染料为吸附剂，研究了溶液pH值、染料初始浓度、吸附时间和离子强度对复合材料吸附性能的影响。MB、MO和AF的平衡吸附数据均符合Langmuir吸附等温式，最大单分子层吸附容量分别为137.00、116.06和132.15 mg/g。吸附动力学符合准二级动力学模型。将CoFe2O4引入到CNTs-CoFe2O4@PPy杂化材料中，不仅可以提供有效的磁分离性能，而且可以作为催化剂活化过硫酸盐（PMS）降解水溶液中的阳离子染料亚甲基蓝（MEB）。结果表明，CNTs-CoFe2O4@PPy具有较高的催化活性、较好的稳定性和可重复使用性，在1.0 g/L催化剂和4 mmol/L PMS的条件下，30 min即可基本去除50 mg/L的MEB。CNTs-CoFe2O4@PPy具有吸附容量大、分离效果好、催化活性高、重复使用性好等特点，有望成为废水处理的理想材料。(C)2017爱思唯尔B.V.保留所有权利。
In this study, the polypyrrole/CNTs-CoFe2O4 magnetic nanohybrid (CNTs-CoFe2O4@PPy) was prepared and then used as adsorbent and catalyst to remove anionic and cationic dyes. The hybrid material was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), elemental analysis, BET surface area, Fourier transform infrared (FTIR) spectroscopy and vibrating sample magnetometer (VSM). Adsorption behaviors of the as-prepared composites for anionic dyes such as Methyl Blue (MB), Methyl Orange (MO) and Acid Fuchsin (AF) were conducted where the effects of solution pH, initial dye concentration, contact time and ionic strength were systematically studied. The equilibrium adsorption data of MB, MO and AF were well fitted to the Langmuir isotherm model, yielding the maximum monolayer adsorption capacity of 137.00, 116.06 and 132.15 mg/g, respectively. Adsorption kinetics was best described by the pseudo-second order model. The introduction of CoFe2O4 into CNTs-CoFe2O4@PPy hybrid could not only provide an effective magnetic separation performance, but also act as catalyst to activate perokymonosulfate (PMS) for the degradation of cationic dye, Methylene Blue (MEB), from aqueous solution. The results shoWed that CNTs-CoFe2O4@PPy presented higher catalytic activity, better stability and reusability for the decolorization of mn, resulting in an almost complete removal of 50 mg/L MEB after 30 min with 1.0 g/L catalyst and 4 mmol/L PMS. The characteristics of high adsorption capacity, effective separation, excellent catalytic activity and good reusability would make CNTs-CoFe2O4@PPy a promising candidate for wastewater treatment. (C) 2017 Elsevier B.V. All rights reserved.