The preparation of Mg–Al spinels through the method of using templates

Abstract

A series of MgO-rich MgAl 2 O 4 samples were prepared by co-precipitation in the presence of CTAB, Triton X-100, and glucose or a combination of CTAB and glucose, which act as templates. The effects of different types and amounts of single template, as well as adding order of the mixed templates, on the specific surface area and particle size were investigated by BET and XRD analyses. The addition of the single template can lead to the increase of the specific surface area, wherein the samples using glucose as templates own the maximum specific surface area of 198 m 2 /g; as for the use of mixed templates, results revealed that adding CTAB first, followed by the addition of glucose, is better, giving a surface area of 223 m 2 /g.

Synthesis and Identification of Co3O4·Fe3O4/CaO Spinel Supported Catalyst

“…The supported spinel catalyst, Co 3 O 4 -Fe 3 O 4 /CaO was synthesized via co-precipitation method by mixing the equivalent weights of metal nitrates salts in the ratio (25:25:50) for cobalt, iron and calcium, respectively. These salts dissolved in 300 mL of deionized water and heated to 60-70 ºC with vigorously stirring and then added 1 M NaOH as a precipitation agent until pH of the solution reached to 10 and again heated mixture with constant stirring for 2 h. The resulting hydroxides were filtered and washed with deionized water until the pH of precipitate become natural and then dried at about 120 ºC for 24 h. The resulting solid precipitate then was crunched and transferred to furnace for calcination at different temperatures (450, 650 and 800 ºC) for 4 h at the heating rate of 10 ºC/min with passing of air atmosphere [28,29].…”

Surfactant-assisted sol-gel synthesis of zinc ferrite magnetic nanoparticles for oil spills cleanup from seawater and antibacterial activity applications

“…Sol–gel is preferred due to its ease of use, low reaction temperature and high yield of final product (Mastuli et al , 2012). Furthermore, surfactants such as cetyltrimethylammonium bromide (CTAB, cationic) are added during nanomaterial synthesis to produce less agglomerated nanoparticles with high surface area and enhanced catalytic activity (Mastuli et al , 2012; Zhang et al , 2015). Thus, it is expected that adding the cationic surfactant, CTAB, during the synthesis of zinc ferrite nanoparticles (ZnFe 2 O 4 ) may produce a multifunctional material with desired properties for oil spill cleanup from the water surface and application in drug development (antibacterial agent) in the future.…”