•Mpg-C3N4/ZnO materials were prepared via hard-templating method.•Their photocatalytic activity was evaluated under visible-light irradiation.•Mpg-C3N4/ZnO exhibited higher photocatalytic activity as compared with mpg-C3N4.•Mpg-C3N4/ZnO composite showed potential application in environment purification.In order to develop highly efficient visible-light induced photocatalysts, the zinc oxide (ZnO) hybridized with mesoporous graphitic carbon nitride (mpg-C3N4) nanocomposite photocatalysts (mpg-C3N4/ZnO) were synthesized through simple one-step calcination in this paper. The physicochemical properties of the synthesized samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), N2 physical adsorption, UV–vis diffuse reflectance spectra (DRS), and photoluminescence spectra (PL). Subsequently, the photocatalytic performance of mpg-C3N4/ZnO was evaluated by photocatalytic degradation of methyl orange (MO) aqueous solution under visible-light irradiation. The photocatalytic activities of the resultant mpg-C3N4/ZnO nanocomposites were enhanced outstandingly and much higher than that of pure mpg-C3N4 and ZnO. The improved photocatalytic activities of the mpg-C3N4/ZnO nanocomposites were ascribed to the exaltation of the separation efficiency of photoinduced electron-hole pairs, resulting from the heterojunction established between the interfaces of mpg-C3N4 and ZnO.Download high-res image (131KB)Download full-size image

•The PLA/HA/GO composites were fabricated via solution blending and casting.•The addition of HA and GO improved the thermal stability of PLA.•The addition of HA and GO improved hydrophobic property of PLA-based composites.•Tensile strength of PLA/HA/GO composites increased with increase content of GO.•The hardness of PLA/HA/GO composites enhanced as GO content increased.A series of polylactic acid/hydroxyapatite/graphene oxide composite (PLA/HA/GO) were fabricated via solution blending and casting method using N,N-dimethyl-formamide (DMF) and CH2Cl2 as mutual solvents. The physicochemical properties of the resulting composites were characterized by means of FT-IR, SEM, TEM, Raman spectra, XRD and N2-physisorption. Particularly, the thermal stabilities, hydrophobic and mechanical properties of PLA/HA/GO composites were systematically investigated. The influences of GO content on thermal stabilities, hydrophobic and mechanical properties of the composites were also evaluated. The results showed that the addition of GO and HA not only improved the thermal stability of PLA, but also improved the hydrophobic property of PLA-based composites. By compared with the PLA/HA/GO composite, the tensile strength of pristine PLA is slight high. The tensile strength and hardness of PLA/HA/GO composites increased with the increase of GO content. The obtained PLA/HA/GO composite may be a promising material for load-bearing orthopedic implants.Download high-res image (142KB)Download full-size image

Using cetyltrimethyl ammonium bromide (CTAB) as the template and sodium silicate as the silicon source, the MCM-41 mesoporous molecular sieves with Eu incorporated in the framework were synthesized under microwave irradiation condition and the influence of the Si/Eu molar ratio on the crystalline structure, textural properties and the long-range ordering of the resulting sample was investigated by various physicochemical techniques such as X-ray diffraction (XRD), transmission electron microscope (TEM), diffuse reflectance ultraviolet–visible spectroscopy (UV–vis), thermal gravimetric–differential scanning calorimeter (TG–DSC) and N2 physical adsorption. The results of N2 adsorption and XRD reveal that the synthesized sample has the ordered hexagonal mesoporous structure. UV–vis spectra provide the strong evidences that most of europium ions were incorporated into the framework of the MCM-41 sample. The crystalline structure, textural properties and mesoporous ordering of the resultant mesoporous materials are related to the amount of europium incorporation. Small amount europium incorporated into the silica-based MCM-41 does not strongly modify the structure of mesoporous molecular sieve. An increase of the Eu content in sample led to reduction of the specific surface area and the deterioration of the long-range ordering.

Ordered hexagonal arrangement MCM-41 mesoporous molecular sieves were synthesized by the traditional hydrothermal method, and Fe-loaded MCM-41 mesoporous molecular sieves (Fe/MCM-41) were prepared by the wet impregnation method. Their mesoporous structures were testified by X-ray diffraction (XRD) and the N2 physical adsorption technique. Carbon nanotubes (CNTs) were synthesized by the chemical vapor deposition (CVD) method via the pyrolysis of ethanol at atmospheric pressure using Fe/MCM-41 as a catalytic template. The effect of different reaction temperatures ranging from 600 to 800 ∘C on the formation of CNTs was investigated. The resulting carbon materials were characterized by various physicochemical techniques such as transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and Raman spectroscopy. The results show that multi-wall carbon nanotubes (MWCNTs) with an internal diameter of ca. 7.7 nm and an external diameter of ca. 16.9 nm were successfully obtained by the pyrolysis of ethanol at 800 ∘C utilizing Fe/MCM-41 as a catalytic template.