Abstract
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.
Highlights
Nowadays, more than 100,000 commercial dyes are used in various fields, such as the textiles, paper, printing, rubber, plastics, cosmetics, leather tanning, food processing, and dye manufacturing industries [1,2]
The results indicate that the adsorption capacity of mesoporous silica nanoparticles (MSNs) was strongly dependent on the pH value of the solution
In this work, monodispersed MSNs were prepared in a simple way and its adsorption of five cationic dyes was investigated
Summary
More than 100,000 commercial dyes are used in various fields, such as the textiles, paper, printing, rubber, plastics, cosmetics, leather tanning, food processing, and dye manufacturing industries [1,2]. These methods and techniques, including adsorption [8,9], flocculation [10], coagulation [11], electrolysis [12], biodegradation [13], and adsorption is considered to be a promising strategy due to its inherently high efficiency, economic photocatalytic degradation [14,15,16] Among these methods and techniques, considered to feasibility, good biocompatibility, and simplicity in operation [6,17,18].adsorption. Various be a promising strategy due to its inherently high efficiency, economic feasibility, good biocompatibility, materials MSNs would have a potential potential application for the of removal ofdyes cationic dyes from wastewater.
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