Application of ultrasound and methanol for the rapid removal of surfactant from MCM-41 molecular sieve

作者：Zanjanchi Mohammad A; Jabariyan Shaghayegh^*

来源：Journal of the Serbian Chemical Society, 2014, 79(1): 25-38.

DOI：10.2298/JSC130112056A

• ultrasound
• methanol
• mesoporous
• MCM-41
• template removal
• micelle

Ultrasound waves were successfully applied for the removal of the template from mesoporous MCM-41 molecular sieve. The method uses 28 KHz ultrasound irradiation in a methanol solvent for disrupting the micellar aggregation of the surfactant molecules, cetyltrimethylammonium bromide, which fill the pores of as-synthesized MCM-41. After 15 min sonication at the moderate temperature of 40 degrees C, the majority of surfactant molecules had been removed from powder MCM-41. The template removal rate using ultrasound irradiation (15 min) is faster than the rate obtained via thermal calcination. In addition, a perfect hexagonal pore structure was obtained after template removal using ultrasound irradiation, according to characterization using X-ray diffraction (XRD) and nitrogen adsorption analyses, while high temperatures during calcination cause shrinkage that affected the surface properties of the materials. In the present procedure, the surfactant molecules are released into methanol and can be recovered for reuse. The effectiveness of the sonication-prepared MCM-41 as an adsorbent was confirmed by the adsorption of methylene blue (MB).

• 出版日期2014