TiO₂ has attracted significant research interest, principally due to its nontoxicity, high stability, and abundance. Carbon-doped TiO₂ can improve light absorption efficiency. In order to prepare high-efficiency photocatalysts, carbon-doped composites were prepared by hydrothermal reaction in a high-pressure reactor, and then TiO₂/CNT mesoporous composites were prepared by the sol–gel method in an ultrasonic environment. Characterized by SEM and TEM, the composite materials contained TiO₂ nanoparticles as well as CNT. After phase analysis, it was the anatase-doped phase. The following infrared light absorption performance and Escherichia coli bactericidal performance tests showed that it had better infrared and visible light absorption performance than pure TiO₂. The TiO₂/CNT mesoporous nanomaterials synthesized in this work are possible for clean industrial productions.

As an environmental semiconductor material, TiO₂ has important applications in the fields of environmental protection and water treatment. The preparation of P25 particles into nano-functional material films with a high specific surface area has always been a bottleneck limiting its large-scale application. In this paper, a one-step method of preparing TiO₂ nanocomposites by doping carbon nanotube (CNT) and carbon quantum dots (CQD) with tetrabutyltitanate and P25 TiO₂ under ultrasonic radiation is proposed to synthesize a novel antifouling material, which both eliminates the bacterium of Escherichia coli and shows good photoelectric properties, indicating a great value for the industrial promotion of TiO₂/CNT. This mesoporous composite exhibits a high specific surface area of 78.07 M²/g (BET) and a tested pore width range within 10–120 nm. The surface morphology of this composite is characterized by TEM and the microstructure is characterized through XRD. This preparation method can fabricate P25 particles into a nano-functional material film with a high specific surface area at a very low cost.

The global economy is in a phase of rapid development. The bond market is undoubtedly an important part of the economic environment, and both China and the United States have some of the largest bond markets in the world. In this work, the differences between the bond markets in two countries are discussed. By focusing on the government bond market, this paper look at the effects of yield, policy, and market regulation on the two bond markets. Compared with the United States, Chinese bond market is more influenced by national policies and market supervision, which may lead to increased risks and reduced predictability in China’s bond market. At the same time, Chinese bond market is not liquid, and Chinese bond yield does not play the role of market pricing like the US bond yield. This paper is a reference for the study of the respective characteristics of the economic development of the two countries.