Effect of calcination temperature on Mg–Al bimetallic oxides as sorbents for the removal of F− in aqueous solutions

Sorption properties of boron on Mg–Al bimetallic oxides calcined at different temperatures

“…Detailed characterization of the starting materials and Mg-Al bimetallic oxides can be found elsewhere [21]. Briefly, specific surface areas were determined using the Brunauer-Emmett-Teller (BET) method [26], Raman and X-ray photoelectron spectra (XPS) were obtained to determine the surface molar ratios n Al /n Mg , scanning electron microscopy (SEM; VE-9800, Keyence, Tokyo, Japan), and transmission electron microscopy (TEM; TECNAI F20, Phillips, Eindhoven, Netherlands) were performed to observe surface morphologies.…”

“…A hydrotalcite-like compound with the above-described chemical formula in which x was approximately 0.25 was synthesized according to a previously reported method as the starting material for the Mg-Al bimetallic oxides [21,24]. The hydrotalcite-like compound produced via co-precipitation was calcined at 873 K, 1073 K, and 1273 K for 3 h in order to obtain the Mg-Al bimetallic oxides Mg-Al873, Mg-Al1073, and Mg-Al1273, respectively.…”

“…Hydrotalcite adopts a layered, double-hydroxide structure and has a general chemical formula [ , dodecylbenzylsulfonate, 2,4,6-trinitrophenol [18][19][20][21][22][23][24].…”

Effect of formation pH, molar ratio and calcination temperature on the synthesis of an anionic clay based adsorbent targeting defluoridation

“…Among the adsorbents, application of layered double hydroxides (LDH) (e.g., Mg-Al, Zn-Al, and Mg-Fe, etc.) is proved to be highly promising (Lv et al, 2006;Wang et al, 2007;Mandal and Mayadevi, 2008;Viswanathan and Meenakshi, 2010;Cai et al, 2012;Guo and Reardon, 2012;Kang et al, 2013;Zhang et al, 2013;Moriyama et al, 2014).…”

Uptake Fluoride from Water by Starch Stabilized Layered Double Hydroxide

“…However, investigation shows that carbonate anion( CO 3 2− ) is easily generated by CO 2 in the air, enters the intermediate layer and its strong affinity prevents the substitution of other anions unless it is further calcined, thus leading to LDHs which cannot be regarded as exchangeable inorganic anionic materials [19]. It has been reported that remove rate of fluoride ions by Mg/Al LDHs is only 29.8% [20].…”