Synthesis of mackinawite (FeSm) and its heterogeneous fenton-like catalytic degradation performance of rhodamine B

In this work, Mackinawite (FeSm) was synthesized by the homogeneous precipitation method, which was flower-like nanoparticles formed by the aggregation of nanosheets with a preferred orientation along the (001) plane. The heterogeneous Fenton-like degradation performance of FeSm on Rhodamine B (RhB) was investigated, results illustrated that RhB degradation was the synergistic effect of adsorption, Fenton, and the heterogeneous Fenton-like reaction. In repeated experiments, the reduction of reactivity was attributed to the oxidation of FeSm into lepidocrocite, whereas lepidocrocite has relatively low hydroxyl radicals (•OH) production reactivity. Thus, it showed excellent degradation effects in the long-time degradation of RhB. Photoluminescence (PL) technology and free radical capture experiments demonstrated that •OH produced on the surface of catalyst was the main active species to remove RhB. Meanwhile, the Fe species on the surface of FeSm was the main active center for surface-mediated reactions. The total organic carbon (TOC) test revealed that the degradation was not complete and degradation intermediates were formed. Liquid chromatography-mass spectrometry (LC-MS) technology was used to identify the degradation intermediates. On this basis, possible degradation pathways were proposed.

Optimization of the Mechanical Properties and the Cytocompatibility for the PMMA Nanocomposites Reinforced with the Hydroxyapatite Nanofibers and the Magnesium Phosphate Nanosheets

Commercial poly methyl methacrylate (PMMA)-based cement is currently used in the field of orthopedics. However, it suffers from lack of bioactivity, mechanical weakness, and monomer toxicity. In this study, a PMMA-based cement nanocomposite reinforced with hydroxyapatite (HA) nanofibers and two-dimensional (2D) magnesium phosphate MgP nanosheets was synthesized and optimized in terms of mechanical property and cytocompatibility. The HA nanofibers and the MgP nanosheets were synthesized using a hydrothermal homogeneous precipitation method and tuning the crystallization of the sodium-magnesium-phosphate ternary system, respectively. Compressive strength and MTT assay tests were conducted to evaluate the mechanical property and the cytocompatibility of the PMMA-HA-MgP nanocomposites prepared at different ratios of HA and MgP. To optimize the developed nanocomposites, the standard response surface methodology (RSM) design known as the central composite design (CCD) was employed. Two regression models generated by CCD were analyzed and compared with the experimental results, and good agreement was observed. Statistical analysis revealed the significance of both factors, namely, the HA nanofibers and the MgP nanosheets, in improving the compressive strength and cell viability of the PMMA-MgP-HA nanocomposite. Finally, it was demonstrated that the HA nanofibers of 7.5% wt and the MgP nanosheets of 6.12% wt result in the PMMA-HA-MgP nanocomposite with the optimum compressive strength and cell viability.

Nanostructured Fe2O3/TiO2 composite particles with enhanced NIR reflectance for application to LiDAR detectable cool pigments

Nanostructured Fe2O3/TiO2 composite pigment particles synthesized by a homogeneous precipitation method showed improved NIR reflectance by about 23.8% and about 62.7% larger reflectance at 905 nm than Fe2O3.

Synthesis of an Ag3PO4/AlPO4 composites for enhanced visible light-driven photocatalytic activity

Novel non-porous Ag3PO4/AlPO4 composites with a stick shape were synthesized using the homogeneous precipitation method and characterized by XRD, FESEM, XPS, UV-vis spectroscopy and BET method. The photocatalytic performance was evaluated by degradation of MB and MO upon irradiation with visible light. Results indicate that when the molar ratios of Ag3PO4 to AlPO4 are 6:4 or higher, remarkable increases in photocatalytic activity were observed compared with the pure Ag3PO4 powder. The possible mechanism of photocatalytic degradation of dyes by Ag3PO4/AlPO4 composites was proposed.

Synthesis of LiCoO2 particles with tunable sizes by a urea-based-homogeneous-precipitation method

This paper reports the synthesis of monodisperse spherical LiCoO2 particles in a wide range of average diameter using a urea-based-uniform-precipitation method. The average diameter of LiCoO2 particles can be varied from 2 to 14 lm with a uniform size distribution. The effective approach to maintain the size uniformity while changing the average size of LiCoO2 particles is to keep the ratio of [CO(NH2)2] to [CoSO4] at 8 even when the CoSO4 and urea concentrations are changed.

Novel Ni and Al doped manganese oxide (NixAlyMnzO2) ternary catalyst materials synthesized by a homogeneous precipitation method for high performance air electrodes of lithium–oxygen batteries

NixAlyMnzO2 as a highly conductive and stable ternary catalyst is used in lithium–oxygen batteries with excellent electrochemical performances.