Synthesis of Porous Hierarchical MgO and Its Superb Adsorption Properties

Abstract

The porous hierarchical MgO with superb adsorption properties has been synthesized by a facile and scaled-up method. The X-ray powder diffraction, electron microscopy, Fourier transformed infrared, and N2 adsorption-desorption were carried out to study the microstructure of the as-synthesized precursor and product. It has been demonstrated that the as-prepared MgO has a porous hierarchical structure and a high specific surface area (148 m(2) g(-1)). And the MgO sample exhibited super adsorption properties, with maximum adsorption capacity of 2409 mg g(-1) for Congo red, which is the highest reported value. Moreover, the adsorption process of Congo red on porous hierarchical MgO was systematically investigated, which was found to obey the pseudo-second-order rate equation and Langmuir adsorption model.

A hierarchically porous MgFe2O4/γ-Fe2O3 magnetic microspheres for efficient removals of dye and pharmaceutical from water

“…And they are inert and non-biodegradable when discharged into waste streams, which can make people carcinogenic and mutagenic through contaminative drinking water. In addition, antibiotics are used widely in human therapy and farming industry [2]. Contacting with the residual antibiotics and transformation of products may cause various negative effects, such as acute and chronic toxicity and microbial resistance [3].…”

Synthesis of high surface area, mesoporous MgO nanosheets with excellent adsorption capability for Ni(II) via a distillation treating

“…Firstly, the distillation treating can produce fast-moving force during the fluid boiling, which impedes the nanosheets becoming thicker and in favor of forming the thinner nanosheets [30]. Secondly, MgO transforms into Mg(OH) 2 during distillation and more pores are generated due to gas escapeing during annealing [31].…”

Preparation of porous Mn-doped CuO microplates and enhanced adsorption performance

“…1,2 For example, porous carbon, Ni 1·5 Co 1·5 S 4 , aluminum oxide (Al 2 O 3 ), magnesium oxide (MgO) and copper (II) oxide (CuO) have been fabricated with excellent performance. [3][4][5][6][7] Among them, porous copper (II) oxide, as an important p-type semiconductor with a narrow bandgap(1·2 eV), has attracted much attention due to its low cost, high stability and non-toxicity. 8 To date, porous copper (II) oxide micro-/nanospheres, nanowires, nanosheets, nanobelts, nanospindles, microrods, hollow octahedra and hexapod nanostructures have been prepared and displayed outstanding properties.…”

“…The high specific surface area and porous structure contribute to the improvement of adsorption performance. [6][7][8] The FTIR spectra of KEX and the samples after adsorption are shown in Figure 5. The FTIR spectra show the characteristic (C-O-C asymmetric stretching).…”