Preparation And Photocatalytic Performance Of Hydrogenated TiO₂ For Hydrogen Production And Plastic Degradation

Photocatalytic technology has played a role in alleviating energy crisis and environmental pollution problems,among which semiconductor photocatalytic materials play an important role.Titanium dioxide（TiO₂）has attracted extensive attention because of cost-effectiveness,good photostability,and non-toxicity.In the past few decades,TiO₂ has been used in the field of photocatalytic water splitting for hydrogen production and accelerated photodegradation of polymers.In this thesis,hydrogenated TiO₂has been prepared by simple hydrothermal method,impregnation,and plasma gas reduction.The related structural characterizations and tests were carried out,and the performance in photocatalytic hydrogen production and plastic degradation was evaluated.The results showed that TiO₂-based photocatalytic materials have great application potential in the field of photocatalysis.The main results are as follows:1.TiO₂ and TiO₂@Ni（OH）₂ nanosheets were firstly synthesized by a simple hydrothermal method.Then under the guidance of theory and induced by crystal planes,the bimetallic H-TiO₂@Pt _SAs-Ni _NCs with nickel clusters supported on the TiO₂（112）crystal plane and platinum single atoms supported on the TiO₂（101）crystal plane were prepared by plasma hydrogen-argon atmosphere treat.The morphology,phase and bonding mode of the catalyst were characterized by means of XRD,SEM,HRTEM,HAADF-STEM,XPS,XAFS and others.The mechanism showed that the introduction of double cocatalysts reduced the band gap of TiO₂,improved the light absorption capacity,and promoted the improvement of hydrogen production performance.The hydrogen production rate could reach 71.04 mmol/g/h under solar irradiation.2.TiO₂@Ni was synthesized by simple hydrothermal impregnation method,and following gas plasma treatment.The phase,morphology and primary state of the composite were investigated by XRD,SEM and XPS.The photogenerated electron transfer and carrier separation efficiency were measured by photocurrent and impedance tests.The photocatalytic degradation properties of polyethylene（PE）were evaluated.It was found that TiO₂@Ni_2.4%samples synthesized by hydrothermal method and plasma treatment has superior performance with the production rates of CO₂ and CO of 14.3 mg/h/g_cat and 190μg/h/g_cat,respectively.The results show that the separation of electrons and holes is accelerated by the loading of Ni.The holes can participate in the photocatalytic oxidation of plastics,and improves the catalytic performance.In this work,an environmentally friendly photocatalyst loaded with cocatalysts was constructed based on hydrogenated titania nanosheets,which showed excellent catalytic performance in photocatalytic water splitting and degradation of plastics.It plays a positive role in alleviating energy crisis,improving environmental pollution problems and promoting sustainable social development.