The photocatalytic degradation of aniline was studied in annular photoreactor, with 2 6W (EmaxD365 nm) UV lamp as light source, borosilicate glass as wave filter and titanium dioxide immobilized on porous nickel as catalysts. Parameters such as the initial concentration, flow rate, initial pH, dissolved oxygen, electrolyte, hydrogen peroxide addition, temperature and external potential bias affecting the degradation rate of aniline were studied. The results showed that photocatalysis is an effective process for the degradation of aniline. The activated energy for the photocatalytic degradation of aniline is 6.13 kJ mol-1. The initial quantum yield is 1.89% for aniline 1.10×10-4 mol l-1. Total mineralization requires a much longer illumination time than the disappearance of anilines. The external potential bias can largely improve the efficiency of photocatalytic degradation of aniline. The degradation kinetic of aniline can be described by Langmuir-Hinshelwood equation.

研究无水条件下气相三氯乙烯（TCE）的光催化降解反应及其机理，结果表明三氯乙烯的降解产物为HCl、CO2及Cl2，光催化降解速率方程符合Langmuir-Hinshelwood公式，提出了无水条件下TCE的光催化降解机理为空穴直接氧化机理。

The electrochemical quartz crystal microbalance (EQCM) and density functional theory (DFT) have been combined to study the special reaction between thiourea (TU) and metal cluster and the mechanism of the replacement of Cu by Sn in the presence of TU for the first time. The natural bond orbital (NBO) charge of the top copper atom obviously shifts toward positive values compared to the interaction behavior of single and double (SdC) regions with Cu4 cluster via the DFT method. This can explain the reason for the accelerating corrosion process at higher TU concentrations since the copper atoms can change to cuprous ions in this process. It is proven that the thermodynamically impossible replacement of Cu by Sn can occur in the presence of TU by reducing the OCP of the copper electrode to a more negative value than the redox potential of Sn2+/Sn. The DFT investigation on the interactions between delocalization (SdC) and (NsC) regions in TU and Cu4 or Sn4 cluster indicates that the highest molecular occupied orbital (HOMO) of the SdC region has better than adequate to the lowest unoccupied molecular orbital (LUMO) of Cu4 cluster than that of Sn4 cluster. The replacement mechanism deduced based on the first-principles analysis is universally applicable to the alloy deposition, corrosion inhibition, and surface treatment.

TiO2 treated in hydrogen atmosphere showed enhanced photocatalytic activity in degrading the sul-fosalicylic acid (SSal). The results of the electrochemical impedance spectroscopy (EIS) investigation showed that the diameters of the capacitive arcs for the H-TiO2 were much smaller than those of bare TiO2 and thermally treated TiO2 in air, indicating that the charge transfer of the H-TiO2 occurs more rapidly, thus inviting a higher photocatalytic activity. When an external bias was applied on the H-TiO2, the arc of the EIS Nyquist plot decreased obviously than without the bias, suggesting more efficient separation of the photo-generated carriers.

为了探索有机物在固定后光催化剂上的降解行为，将TiO2（锐钛型）粉末固定在多孔泡沫镍上，以一只6W主波长为365nm的紫外线杀菌灯为光源，研究了磺基水杨酸（SSal）在TiO22Ni体系上的光催化降解。结果表明，SSal的降解动力学可采用Langmuir-Hinshelwood（L2H）方程来描述。通过测定降解反应的半衰期和测定初始速率的方法确定了L2H方程的参数，两种方法的结果相吻合。还研究了SSal的光催化降解反应速率与pH值和温度的关系。结果表明，当pH值为7.5左右时，SSal的光催化降解最为有利;当温度从20℃升至50℃时，SSal的光催化降解加快。通过考察不同pH值时SSal在TiO2/Ni体系上的吸附能力探讨了反应初始速率与pH值的关系。