Carbon coated Au/TiO2 mesoporous microspheres: a novel selective photocatalyst

Abstract

Photocatalysts with desirable selectivity to transformation and purification of targeted pollutants are of great importance in water purification. Here, we demonstrate that selective photocatalysis can be realized by the assistance of gold-enhanced selective adsorption onto carbon-coated Au/TiO2 mesoporous microspheres (Au/TiO2@C-MM), which were prepared via a surfactant-assisted two-step method that involved the assembly of oleic acid-stabilized titania and gold nanoparticles into colloidal spheres in an emulsion using sodium dodecyl sulfate as a surfactant and the conversion of the surfactants into carbon under annealing in Ar. Due to the negatively charged amorphous carbon, the mesoporous structure, and the surface plasmon resonance absorption of the Au components, the Au/TiO2@C-MM shows enhanced charge-and size-selective adsorption properties, which enables the materials to have high selectivity in the photocatalytic process.

Structural Engineering of Low‐Dimensional Metal–Organic Frameworks: Synthesis, Properties, and Applications

“…Such unique structural and compositional features make MOF-based materials promising for a wide range of applications, such as gas storage and separation, catalysis, sensors, and drug delivery. [25][26][27][28][29] Low-dimensional (LD) nanomaterials are of particular interest due to their anisotropic-tunable properties, which greatly influence their performances. [21][22][23][24] Similar to the size-dependent properties which are wellknown for nanomaterials, reducing size of MOF crystals may bring enlarged specific surface area and increased density of active sites for MOFs, leading to improved performance.…”

Fabrication of tunable hierarchical MXene@AuNPs nanocomposites constructed by self-reduction reactions with enhanced catalytic performances

“…However, it is still challenging to design and obtain MXene-based composites via facile and effective self-assembly. Alternatively, Au nanostructures and nanocomposites have shown important applications in cancer-related detection, selective photocatalysts and controlled drug release [42][43][44][45]. It is expected that a combination of MXene-based composites with gold na-noparticles could be especially advantageous, owing to controllable nanostructures and enhanced catalytic properties.…”

Boosting Lithium Storage Properties of MOF Derivatives through a Wet‐Spinning Assembled Fiber Strategy

“…The high-resolution C1 ss pectrum ( Figure 2d)i sd ivided into four typical peaks with binding energies of 284.8, 285.5, 286.6, 288.7 eV, corresponding to CÀC, C-O-C, C=O, O-C=O, respectively. [59,60] As ap roof-of-concept, the obtained Fe 2 O 3 /rGO composite fibers were used as anode material for LIBs. The cyclic voltammetry (CV) curves of porous Fe 2 O 3 /rGO composite fibers with the first three cycles in the potential range of 0.01-3 Vats can rate of 0.1 mV s À1 are shown in Figure 3a.I nt he first cathodic scan, ac learly defined reduction peak located at % 0.6 Vc orresponding to the reduction of Fe 3 + to metallic Fe and the formation of Li 2 O.…”