Journal
NANOMATERIALS
Volume 8, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/nano8010004
Keywords
adsorption; cationic dyes; dye removal; monodispersed mesoporous silica nanoparticles
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Funding
- National Nature Science Foundation of China [21477033]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [17HASTIT003]
- Program for Excellent Youth Scholars in Higher Education of Henan Province [2014GGJS-024]
- Program for Development in Science and Technology of Henan Province [172102310608]
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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 m(2)/g), uniform particle size (about 30 nm), large pore volume (1.175 cm(3)/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.
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