Jingshuang Zhang

Growth of two-dimensional silicalite-1 on graphene oxide with controllable electrical conductivity

Multi-quaternary ammonium surfactants are assembled co-operatively with graphene oxide (GO) to generate two-dimensional (2D) silicalite-1. The hybrid composites behave with controllable electrical conductivity and exhibit a specific surface area (SBET) as high as 643 m2 g−1.

Synthesis of b-oriented MFI nanosheets with high-aspect ratio by suppressing intergrowth with 2D GO nanosheets

High-aspect ratio b-oriented MFI nanosheets are synthesized by simply adding a suitable amount of graphene oxide (GO) nanosheets into a multilamellar MFI zeolite crystallization system. The GO nanosheets, serving as the building blocks for oriented attachment and in situ nucleation sites, positively induce the silicalite-1 nanosheet crystallization process and confine the over-growth of MFI crystals during the subsequent preparation. A two-dimensional (2D) induction mechanism of the GO nanosheets is discussed for the generation of the b-oriented MFI nanosheets. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), nitrogen adsorption, Fourier transform infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA).

Metal–organic frameworks (MOFs) as highly efficient agents for boron removal and boron isotope separation

The boron adsorption and isotopic separation on water-stable metal–organic frameworks (MOFs) were evaluated. These materials, to date, exhibit fairly high to highest adsorption capacities for boron. Furthermore, unprecedentedly high isotopic separation factors (S) were observed in some materials.

Theoretical study on complexes and reactions of boron isotopic exchange separation with fluorinated anisoles as novel donors

Semi-empirical and ab initio density-functional theory (DFT) methods were evaluated for the description of isotope exchange reactions to produce enriched 10B species. We found that DFT calculations using M06-2X/6-311+G(3d,2p) functional and basis sets in combination with the SMD implicit solvation model were able to correctly predict the performance of various anisole-derived donor molecules. We confirmed that fluorination results in greatly increased separation factors, and successfully identified the o- and 2,4-difluorinated anisole as superior donors for chemical exchange distillation. These findings provide the basis for an efficient approach to rapidly screen and design new donor species.