Development of a trapezoidal MgO catalyst for highly-efficient transesterification of glycerol and dimethyl carbonate

Abstract

Trapezoidal MgO has been developed for the transesterification of glycerol and dimethyl carbonate with a glycerol carbonate yield of more than 99%.

Microscale flower-like magnesium oxide for highly efficient photocatalytic degradation of organic dyes in aqueous solution

“…To date, various morphologies of micro-sized MgO have been developed via different protocols. [31][32][33][34][35][50][51][52][53][54] As reported in many studies, 14,29,34,[55][56][57][58][59] the catalytic performance of MgO was highly dependent on its morphology. To get an insight into the difference between the developed ower-like MgO and others in photocatalytic degradation of methylene blue, several morphologies (e.g., nest-like, spherical, rod-like and trapezoidal) of MgO were prepared following the previous reports.…”

“…All reagents (e.g., Mg(NO 3 ) 2 $6H 2 O and Na 2 CO 3 ) were of analytical grade or better and were used as received without further purication. The procedure was similar to our previous report 14 but had a different stirring condition. Specically, 0.04 mol of Mg(NO 3 ) 2 $6H 2 O (Guangdong Guanghua Sci-Tech Co., Ltd., Shantou, China) was dissolved into 50 mL of deionized water, followed by transferring into a 250 mL three-necked ask and heated to 70 C. Under the vigorous stirring (ca.…”

“…Amongst them, precipitation has received considerable attentions due to its unique features such as facile large-scale production, cost-effectiveness and avoidance of organic reagents. In the previous studies, 14,[32][33][34][35] we found that various morphologies of micro-sized MgO could be synthesized by precipitation. Inspired by those investigation, herein we developed a micro-sized ower-like MgO, and explored its shape and composition evolution with reaction time.…”

“…For the recycle and regeneration of ower-like MgO particles, the collected catalyst was rst heated to 400 C and then maintained at that temperature for 3 h in a nitrogen atmosphere followed by calcination at 550 C for 3 h in air following our recent study. 14 The degradation efficiency of studied dye on MgO was evaluated using eqn (1), 36 and the photocatalytic kinetic was characterized by eqn (2). 20…”

“…[6][7][8] Numerous metal oxides (e.g., TiO 2 , 9 ZnO, 10 Fe 2 O 3 11 and WO 3 12 ), owing to their high chemical stability, nontoxicity, high activity, and low cost, have been extensively used as photocatalytic materials for degradation of organic dyes, and their catalytic mechanisms have also been well documented. 13 Magnesium oxide (MgO), as a versatile oxide material, has found widespread applications in the elds of adsorption, 5 catalysis, 14 ceramics, 15 antibacterial materials, 16 paint, 17 and superconductor products. 18 Some attempts [19][20][21][22][23][24][25][26] have also been made to employ MgO as a photocatalyst for degradation of various dyes in aqueous solution based on its large band gap, low dielectric constant and refractive index.…”