Organic Functionalization Of Low-dimensional Materials And Properties Of Nanocomposites

In recent years,with the continuous development of the world economy,energy depletion and environmental pollution have become one of the major problems that need to be solved urgently in the world.Many nanomaterials and nanocomposites have been widely used in the field of pollution control and new energy because of their unique excellent properties.TiO₂ has been favored by scientists because of its low price,simple preparation,innocuity,innocuity,good hydrophilicity and strong chemical stability.TiO₂is a very important photocatalyst.One of them is to oxidize a lot of refractory organic pollutants to CO₂ and H₂O or some low toxic intermediates,so as to purify water and control pollution.However,because TiO₂ has larger forbidden band width,it only absorbs ultraviolet with shorter wavelength,which only accounts for 3%⁵%of solar energy.Therefore,how to expand the spectral response range of TiO₂ so that it can effectively use the weak visible light and how to modify the TiO₂ to increase its photocatalytic activity is still a problem to be solved,and it is also the focus of this study.In the aspect of inorganic modification of TiO₂ spectral response,it is an effective material method to prepare heterogeneous composites with metal oxides.TiO₂/NiO,TiO₂/CoO and TiO₂/Fe₂O₃ heterostructured nanocomposites were prepared by hydrothermal method.The microstructure and spectral properties of the nanocomposites were characterized by SEM,TEM,XRD and UV-vis.The results show that NiO,CoO and Fe₂O₃ nanoparticles are successfully attached to TiO₂ nanotubes and form TiO₂ based heterogeneous nanocomposites.The characterization data of UV-vis show that the nanocomposite broadens the spectral response range of TiO₂,which can also have better absorption in the visible light area,and is expected to have a good potential application value in the field of photocatalysis.We choose the representative organic pollutants,rhodamine B and methylene blue,and carry out photocatalytic degradation experiments under the weak visible light.Some materials have achieved good results.On the basis of the prepared TiO₂ heterostructured composites,in order to give full play to the complementary behavior of organic materials,we use cyclodextrin grafted polymer containing carboxyl group to modify the surface of TiO₂/NiO and TiO₂/CoO self-assembly approach,and obtain organic/inorganic nanocomposites modified on the surface of TiO₂/NiO and TiO₂/CoO,and carry out the internal microstructure of the organic/inorganic nanocomposites.A series of characterization were performed.The photocatalytic degradation experiment of the representative organic pollutants is also selected,and the photocatalytic degradation experiment is carried out under the weak visible light.Some materials have achieved good results.In addition,perylene is one of the most important organic semiconductors,and has good fluorescence characteristics.It is widely used in chemical sensing and the detection of environment and biomedicine.It is also a new organic photocatalyst in recent years.For this reason,we use the derivatives of perylene?including-NH₂,-COOH?to study the modification and related properties of some low dimensional nanomaterials,such as metal oxides,graphene oxide and carbon nanotubes using chemical groups of these material.Based on the organic modification effect of TiO₂ heterostructure,we have also extended the organic surface modification and related research of other low dimensional metal oxides in the field of environment and energy,and obtained more ideal results under the weak visible light irradiation.