College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China.
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China.
J Colloid Interface Sci. 2018 Mar 1;513:647-657. doi: 10.1016/j.jcis.2017.11.070. Epub 2017 Nov 26.
A facile and environmental-friendly approach was developed to prepare magnetic nano-adsorbent for environmental pollutant removal. Based on the mussel-inspired polymerization, amino-coated FeO nanoparticles were fabricated by simply immersing FeO nanoparticles into an aqueous solution of catechol and hexanediamine with stirring at room temperature. The magnetic nano-adsorbent was characterized via Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), thermo gravimetric analysis (TGA), and Brunauer-Emmett-Teller's test (BET). The effects of initial mole ratio of catechol/hexanediamine and coating time on the adsorption capacity were investigated, using Congo red as a model organic dye. Under the optimal preparation condition, the absorption capacity of the amino-coated FeO nanoparticles reached 97.3 mg/g for Congo red, and the adsorption reached about 80% of the equilibrium adsorption amount within 200 min. Adsorption kinetics and isotherm studies indicated that the absorption process fitted the pseudo-second-order kinetic and Langmuir isotherm models well. Besides, desired functional groups could be introduced onto the surface of FeO nanoparticles, to tailor the adsorption capacity for Congo red, amaranths red, methylene blue and methylene violet. It is believed that the amino-coated magnetic nano-adsorbent prepared by the proposed method in this study has a good prospect for wastewater treatment.
一种简便且环保的方法被开发出来，用于制备用于去除环境污染物的磁性纳米吸附剂。基于贻贝启发的聚合反应，通过简单地将 FeO 纳米粒子浸入含有邻苯二酚和己二胺的水溶液中，并在室温下搅拌，制备出氨基包覆的 FeO 纳米粒子。通过傅里叶变换红外光谱（FTIR）、透射电子显微镜（TEM）、X 射线衍射（XRD）、振动样品磁强计（VSM）、热重分析（TGA）和 Brunauer-Emmett-Teller 测试（BET）对磁性纳米吸附剂进行了表征。使用刚果红作为模型有机染料，考察了初始邻苯二酚/己二胺摩尔比和包覆时间对吸附容量的影响。在最佳制备条件下，氨基包覆的 FeO 纳米粒子对刚果红的吸附容量达到 97.3mg/g，在 200min 内吸附达到平衡吸附量的约 80%。吸附动力学和等温线研究表明，吸附过程符合准二级动力学和朗缪尔等温线模型。此外，还可以在 FeO 纳米粒子的表面引入所需的官能团，以调整对刚果红、苋菜红、亚甲基蓝和亚甲基紫的吸附容量。可以相信，本研究中采用所提出的方法制备的氨基包覆磁性纳米吸附剂在废水处理方面具有良好的前景。
