Dye adsorption onto magnetic and superparamagnetic Fe3O4 nanoparticles: A detailed comparative study
Dye adsorption onto magnetic and superparamagnetic Fe3O4 nanoparticles: A detailed comparative study
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DOI：
10.1016/j.jece.2020.103994
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发表时间：
2020-10-01
影响因子：
7.7
通讯作者：
Vaz de Araujo, Ana Claudia
中科院分区：
文献类型：
--
作者：
Damasceno, Barbara Souza;Viana da Silva, Anderson Felipe;Vaz de Araujo, Ana Claudia
纺织工业的环境污染已成为一个严重的问题。吸附技术是目前去除染料最有效的方法之一，具有操作简单、效率高、成本低等优点。超顺磁性纳米粒子在这方面的应用前景广阔。本文采用化学共沉淀法制备了超顺磁性磁铁矿纳米粒子（NP-SYN），并将其吸附性能与商用磁铁矿纳米粒子（NP-COM）进行了比较。采用XRD、TEM、磁力仪、FTIR和孔隙率仪对纳米粒子进行了表征。NP-COM和NP-SYN的D-XRD分别为约63和27 nm。磁化曲线显示NP-COM和NP-SYN的SM值分别为82和72 emu g（-1）。NP-COM的矫顽场为1.6 × 10（-2）Oe，但NP-SYN无法测量，表征其超顺磁性行为。NP-COM和NP-SYN的表面积分别约为50和127 m（2）g（-1）。同时，研究了纳米粒子对靛蓝胭脂红（IC）染料的吸附性能。选择pH 4.0、150 min接触时间和20 mg L-1染料浓度作为进一步研究的参数。NP-COM和NP-SYN的最大吸附容量分别为6.12和17.45 mg g（-1）。吸附过程符合准二级动力学和Langmuir、Freundlich和Temkin等温式。NP-COM和NP-SYN的IC染料去除效率分别为33%和87%。在IC染料解吸后，NP被回收并重复使用5次而不损失效率。因此，超顺磁性磁铁矿纳米粒子被提出作为潜在的吸附剂在固液界面。
Environmental pollution from textile industries has become a serious problem. So far, adsorption technology is one of the most effective methods for dye removal, due to its simplicity, high efficiency, and low cost. Superparamagnetic nanoparticles hold great promise for this application. In this work, superparamagnetic magnetite nanoparticles (NP-SYN) were synthesized by chemical co-precipitation, and their adsorption performance was compared to commercial magnetite nanoparticles (NP-COM). The nanoparticles (NPs) were characterized by XRD, TEM, magnetometry, FTIR, and porosimetry. The D-XRD for NP-COM and NP-SYN were around 63 and 27 nm, respectively. The magnetization curves show SM values of 82 and 72 emu g(-1) for NP-COM and NP-SYN, respectively. Coercive field for the NP-COM was 1.6 x 10(-2) Oe but could not be measured for NP-SYN, characterizing its superparamagnetic behavior. The surface areas for NP-COM and NP-SYN were around 50 and 127 m(2) g(-1), respectively. Meanwhile, indigo carmine (IC) dye adsorption performances on NPs were investigated. Parameters as pH 4.0, 150 min contact time and 20 mg L-1 dye concentration were chosen for further studies. Maximum NP-COM and NP-SYN adsorption capacity was 6.12 and 17.45 mg g(-1), respectively. Batch adsorption process obeys pseudo-second-order kinetics and Langmuir, Freundlich and Temkin isotherms onto NPs. The IC dye removal efficiency was 33 % to NP-COM and 87 % to NP-SYN. After IC dye desorption, NPs were recovered and reused 5 times without losing efficiency. Hence, superparamagnetic magnetite nanoparticles were proposed as potential adsorbent at the solid-liquid interfaces.