期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 1, 期 40, 页码 12485-12496出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta12553j
关键词
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资金
- Ministry of Science, ICT & Future Planning, Korea (Acceleration Research program) [2013041172]
- Pioneer Research Center Program [2013041888/201304889]
- National Research Foundation of Korea [2009-0078791, 2010-0019482] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Novel core-shell magnetic mesoporous silica hybrid nanoparticles were synthesized and functionalized further with a glycidol reagent to produce boron-specific cis-diol, chelating functional derivatives. The resulting core-shell hybrid nanoparticles were found to be a better alternative to the existing boron adsorbents that had been modified with large molecular weight saccharide moieties and polymer functionalities. The magnetic mesoporous silica hybrid nanoparticles had a surface area, diameter, pore size, and saturation magnetization of 629 m(2) g(-1), 200-300 nm, 2.5 nm, and 33.25 emu g(-1), respectively. The glycidol-modified nanoparticles with cis-diol functional groups showed high adsorption affinity and excellent selectivity towards boron in an aqueous solution, even in the presence of competitive metal ions (Ni2+, Cu2+, Cr2+ and Fe2+) and sulphates and chlorides of Na+, K+, Ca2+ and Mg2+ ions. Adsorption equilibrium could be established within 15-20 min, and the level of boron adsorption was 2.37 mmol g(-1), which is much higher than the values previously reported for other boron adsorbent materials. The synthesized magnetic mesoporous silica hybrid nanoparticles showed approximately 97% boron removal capacity from a H3BO3 solution (100 mg L-1), and the used adsorbent particles could be separated easily from the aqueous suspensions by an external magnetic field. The adsorbent could be used repeatedly after a simple acid treatment (0.1 M HCl) and regenerated by an aqueous ammonia solution (3% NH3 center dot H2O).
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