Preparation method of graphene quantum dots-sensitized urchin-like titanium dioxide photocatalytic material

Abstract

The invention discloses a preparation method of graphene quantum dots-sensitized urchin-like titanium dioxide photocatalytic material; the preparation method comprises: preparing nano TiO2 powder, preparing GQDs (graphene quantum dots) via thermal cracking, preparing GQDs-TiO2 and other steps. The GQDs-sensitized urchin-like TiO2 provided herein is different from conventional anatase TiO2, and is TiO2 having special spherical urchin morphology; compared with truncated octahedral morphology of the original anatase TiO2, the TiO2 has greatly improved active surface area; spatial size of urchin spikes is of submicron level, capillary effect can be generated, bonding of liquid pollutants to the catalytic surface of the TiO2 is promoted, and photocatalytic effect of the TiO2 is improved. The preparation method is low in cost, handy, and easy to use to achieve large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a sea urchin-like titanium dioxide photocatalytic material sensitized by graphene quantum dots. Background technique [0002] The energy crisis is becoming more and more severe, and the use of solar energy to produce hydrogen is undoubtedly the most popular research direction at present. The Fujishima team observed that the nanoscale semiconductor TiO 2 After the photocatalytic decomposition of water to produce hydrogen, the research on nano-TiO has quickly set off around the world. 2 The upsurge of solar energy utilization has also stepped into a brand-new stage. TiO 2 Because of the advantages of non-toxicity, low cost, high chemical stability, and high photocatalytic activity, it has broad application prospects in photocatalysis, but the traditional TiO 2 There are a series of problems such as the energy gap value is too large and can only respond to the ultraviolet band, and the photogenerated ele...

AI Technical Summary

Problems solved by technology

However, most of the sensitized particles that have been studied so far are spherical nanoparticles, and the steric hindrance between them limits the number of these sensitized nanoparticles, which in turn affects the sensitized TiO 2 Surface active site density of nanocomposite particles; even the recently heavily studied graphene-TiO 2 Composite particles mostly use the structure of graphene sheets, and the size of graphene is as large as microns. In this system, TiO 2 Nanoparticles are generally distributed on graphene sheets, which cannot guarantee sufficient sensitization to the active surface of nanoparticles. Moreover, due to the serious self-agglomeration characteristics of graphene itself, the efficiency of irradiation is affected, resulting in an increase in the catalytic performance not ideal

On the other hand, from the perspective of application, nano-TiO 2 The application of photocatalysis and other aspects obviously depends on its specific surface area. From the perspective of nanometerization, the specific surface area per unit weight is related to the size of nanoparticles. It seems that the smaller the size, the larger the specific surface area per unit weight. However, due to the characteristics that nano-level particles tend to agglomerate under the action of surface energy, effective nano-TiO 2 The catalytic surface is not the sum of the surface areas of individual nanoparticles, and severe interparticle agglomeration will greatly reduce the effective catalytically active surface area.

Images