Qin Peige, Yang Yixin, Zhang Xiaoting, Niu Jiahua, Yang Hui, Tian Shufang, Zhu Jinhua, Lu Minghua
Institute of Environmental and Analysis Science, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, Henan, China.
Institute of Pharmacy, Pharmaceutical College, Henan University, Kaifeng 475004, Henan, China.
Nanomaterials (Basel). 2017 Dec 23;8(1):4. doi: 10.3390/nano8010004.
In this work, a highly efficient and rapid method for simultaneously removing cationic dyes from aqueous solutions was developed by using monodispersed mesoporous silica nanoparticles (MSNs) as the adsorbents. The MSNs were prepared by a facile one-pot method and characterized by scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, and Brunauer-Emmett-Teller. Experimental results demonstrated that the as-prepared MSNs possessed a large specific surface area (about 585 m²/g), uniform particle size (about 30 nm), large pore volume (1.175 cm³/g), and narrow pore size distribution (1.68 nm). The materials showed highly efficient and rapid adsorption properties for cationic dyes including rhodamine B, methylene blue, methyl violet, malachite green, and basic fuchsin. Under the optimized conditions, the maximum adsorption capacities for the above mentioned cationic dyes were in the range of 14.70 mg/g to 34.23 mg/g, which could be achieved within 2 to 6 min. The probable adsorption mechanism of MSNs for adsorption of cationic dyes is proposed. It could be considered that the adsorption is mainly controlled by electrostatic interactions and hydrogen bonding between the cationic dyes and MSNs. As a low-cost, biocompatible, and environmentally friendly material, MSNs have a potential application in wastewater treatment for removing some environmental cationic contaminants.
在本研究中，以单分散介孔二氧化硅纳米颗粒（MSNs）作为吸附剂，开发了一种高效快速地同时从水溶液中去除阳离子染料的方法。MSNs通过简便的一锅法制备，并通过扫描电子显微镜、透射电子显微镜、傅里叶变换红外光谱和布鲁诺尔-埃米特-泰勒（BET）法进行表征。实验结果表明，所制备的MSNs具有较大的比表面积（约585 m²/g）、均匀的粒径（约30 nm）、大的孔体积（1.175 cm³/g）和窄的孔径分布（1.68 nm）。该材料对阳离子染料罗丹明B、亚甲基蓝、甲基紫、孔雀石绿和碱性品红表现出高效快速的吸附性能。在优化条件下，上述阳离子染料的最大吸附容量在14.70 mg/g至34.23 mg/g范围内，可在2至6分钟内实现。提出了MSNs对阳离子染料吸附的可能机理。可以认为，吸附主要受阳离子染料与MSNs之间的静电相互作用和氢键控制。作为一种低成本、生物相容性好且环境友好的材料，MSNs在去除一些环境阳离子污染物的废水处理中具有潜在应用。
