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Magnesium Silicate Nanoparticals for Efficient Adsorption of Low Concentration Methylene Blue

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Magnesium silicate nanoparticles had been successfully synthesized with a chemical precipitation method in water (MS) and alcohol-water systems (T-MS). The as-prepared samples feature high adsorption performance for cationic pollutants. The powder X-ray diffraction analysis (PXRD) indicates that the MS and T-MS samples are amorphous, and SEM and TEM reveals that the both samples form aggregation comprising of nanoparticles with an average diameter of 30 nm. The MS nanoparticles are more inclined to aggregate as cluster, while the T-MS nanoparticles are more uniformly distributed. Their adsorption performance was evaluated by using methylene blue (MB) was used as the model pollutant. The results showed that the T-MS samples reaches adsorption equilibrium earlier. The maximum adsorption capacities are 135 mg/g and 117 mg/g for T-MS and MS samples, respectively. In addition, the competitive adsorption test proves that the adsorption capacity of T-MS for MB does not degrade, even with the presence of Methyl orange, Cl-, SO2- 4 or metallic ions, which showed the T-MS samples feature high selective removal of cationic dyes. Zeta potentials testified that the electrostatic interaction dominated the adsorption process. This work not only provide a promising absorbent for collecting dye pollutants, but also offers a simple method for large scale preparation of nanosized magnesium silicate.
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Keywords: Adsorption; Alcohol-Water Systems; Electrostatic Adsorption; Magnesium Silicate

Document Type: Research Article

Affiliations: College of Environment and Resources, Fuzhou University, Fuzhou 350108, China

Publication date: August 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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