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The photo-Fenton activity of ZnFe 2 O 4 was enhanced by the ZnFe 2 O 4 /α-Fe 2 O 3 (ZFO/FO) heterostructure synthesized via a one-step hydrothermal method. The degradation efficiency was further improved by loading Pt nanoparticles on the surface of the heterostructure. The degradation efficiencies of MB for ZnFe 2 O 4 , ZFO/FO, and ZFO/FO/Pt were 57.82%, 83.71%, and 99.96%, respectively. This can be ascribed to Pt working as an "electron bridge" to transfer the photo-generated electrons from the α-Fe 2 O 3 to solution, thus improving the photo-Fenton efficiency. A noteworthy feature of this study is the successful strategy to fabricate heterostructures photo-Fenton for solving environmental problems at the alkaline condition of pH 9., (Copyright © 2019 Elsevier Inc. All rights reserved.)

Mesoporous MgO nanosheets with a high adsorption rate and excellent adsorption capacity for removing Ni (II) were successfully synthesized by a hydrothermal and annealing method. The Mg(OH) 2 was first synthesized by a hydrothermal process using magnesium powder as the starting material. MgO was then obtained by annealing the as-prepared Mg(OH) 2 at 450°C. The advantage of the magnesium powder as the starting material is it slowly generated Mg 2+ . Thus, the low centration of Mg 2+ guaranteed a slow rate of forming Mg(OH) 2 , which benefited with a mesoporous structure. The effect of the hydrothermal time on the structure and adsorption performance was studied. The results showed that the MgO synthesized for 4h had the highest adsorption performance of 2217mg/g and the highest adsorption rate, which resulted in an efficient adsorption of 96% in 5min for Ni (II) with the concentration of 500mg/L., (Copyright © 2017 Elsevier Inc. All rights reserved.)

In this study, graphitic C3N4 (g-C3N4) with high photocatalytic properties to methylene blue (MB) was synthesized by treating the bulk g-C3N4 using the Hummers method. The bulk g-C3N4 was obtained by calcining dicyandiamide. The g-C3N4 treated by the Hummers method (E-g-C3N4) was characterized and utilized for the photocatalytic removal of MB. The results showed that the Hummers treatment exfoliated the nanosheets bulk g-C3N4 into nanorods and improved the dispersion of E-g-C3N4 in an aqueous solution. It also distinctly enhanced the photocatalytic activity of g-C3N4 to MB, i.e., the removal efficiency increased from 38.45% for the bulk g-C3N4 to 96.61% for the E-g-C3N4., (Copyright © 2016. Published by Elsevier Inc.)

The magnetic ZnO/ZnFe2O4 particles have been synthesized by a microwave combustion method using NaAc as fuel. The as-obtained ZnO/ZnFe2O4 was characterized and applied for the removal of methylene blue (MB) from aqueous solution in the batch system. The ZnO/ZnFe2O4 particles display larger S(BET) and smaller size with increase of NaAc dosage. Because a certain amount of gas is generated during NaAc decomposing and the gas prevent the particles from growing larger. More interestingly, even at neutral pH value, the ZnO/ZnFe2O4 obtained with 24 mL NaAc shows high-rate adsorption properties with the MB removal efficiency up to 90% in 0.5 min and a maximum adsorption capacity of 37.27 mg/g., (Copyright © 2014 Elsevier Inc. All rights reserved.)

Hexagonal mesoporous MgO nanosheets with a side length of 250 nm and specific surface area of 181.692 m(2)/g were fabricated by a three-step process. Firstly, MgO powders were obtained by sintered Mg5(OH)2(CO3)4⋅4H2O, which was synthesized by a wet precipitation process using ammonium hydrogen carbonate as precipitants. Secondly, the above-MgO were distilled 2 h in a three-necked bottle with condenser device. Lastly, we annealed the distilled-MgO at 500-800 °C to form mesoporous MgO nanosheets. We found the pore size distribution and the thicknesses of nanosheets were determined by the distillation process in step 2 and annealed temperature in step 3. By optimizing the experimental parameters, the mesoporous dis-MgO annealed at 600 °C displayed uniform hexagonal structure with the largest pore volume (0.875 cm(3)/g) and highest BET surface area (181.692 m(2)/g), as well as the maximum adsorption capability of 1684.25 mg/g for Ni(II)., (Copyright © 2014 Elsevier Inc. All rights reserved.)