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Chinese researchers have developed a new method for preparing porous graphene with high efficiency and low cost.

2019-04-03 来源:亚科官网
 
Recently, the group of chiral separation and micro-analysis led by researcher Qiu Hongdeng of the Lanzhou Institute of Chemical Physics of the Chinese Academy of Sciences took the lead in using a water-slip layer to partially cover the partial combustion of graphene oxide, and developed a simple, fast, efficient and low-cost preparation method for porous graphene. The results show that the precise control of the pore size of the porous graphene can be achieved by controlling the content of the salt template. In addition, the researchers also prepared a porous graphene separation membrane by vacuum filtration to achieve high selectivity separation of sodium and potassium ions.
Characteristics of porous graphene
As an important graphene derivative, porous graphene not only has the excellent properties of graphene itself, but also the introduction of pores can produce many unique properties compared to the perfect lattice graphene surface, such as: open band gap, large actual special surface area, tough mechanical strength, excellent mass transfer capability, etc., and thus it has broad application prospects in the fields of energy, catalysis, environment, micro-analysis and sensing.
Preparation of porous graphene composites
At present, the preparation method of porous graphene can be divided into a top-down method from the macroscopic point of view—electron beam or ion beam bombardment, chemical etching, etc., and bottom-up method—direct chemical synthesis from monomers, etc. However, these methods typically require expensive equipment, harsh reaction conditions, and long reaction times. The researchers fixed the porous graphene prepared by the above method onto the surface of porous silica gel, and successfully prepared a porous graphene-modified liquid chromatographic stationary phase, and studied its hydrophilic chromatographic properties. In addition, the researchers also modified the porous graphene to the stainless steel fiber substrate, and established a new method based on porous graphene-based direct impregnation solid-phase microextraction-gas chromatography to achieve polycyclic aromatic hydrocarbons (PAHs) in environmental water samples. Based on the above principles, the researchers prepared a magnetic porous graphene composite.
It has been found to have good oxidase-like properties, which can oxidize thiamine (TH) to dehydrothiamine (TC) under alkaline conditions, based on reduced glutathione (GSH). Inhibition, a new method for selective fluorescence detection of GSH was established and used for the analysis of GSH content in PC12 cell lysate. The changes of GSH content in PC12 cell lysate under different drugs were also investigated.
At the same time, the researchers also used this method to prepare porous graphene/cuprous oxide composites and simple cuprous oxide nanocubes. Studies have shown that the composite has significant peroxidase-like activity and can catalyze the oxidation of luminol to produce strong chemiluminescence. However, in the presence of reduced nicotinamide adenine dinucleotide (NADH), the chemiluminescence intensity of the system is significantly inhibited. Inspired by this phenomenon, a new chemoluminescence sensing strategy with high selectivity and high sensitivity for detecting NADH was constructed. This strategy can be used for the quantitative detection of NADH in human serum and A549 cell lysate, and the experimental results are in good agreement with the current sensor and liquid chromatography results.
In addition, the researchers also prepared porous graphene/zinc oxide nanocomposites and single zinc oxide nanoparticles, and studied the properties of the material in photocatalytic degradation of dyes.
Edited by Suzhou Yacoo Science Co., Ltd.