Diphenylarsinic acid contaminated soil remediation by titanium dioxide (P25) photocatalysis: Degradation pathway, optimization of operating parameters and effects of soil properties.

Diphenylarsinic acid (DPAA) is formed during the leakage of arsenic chemical weapons in sites and poses a high risk to biota. However, remediation methods for DPAA contaminated soils are rare. Here, the photocatalytic oxidation (PCO) process by nano-sized titanium dioxide (TiO2) was applied to degrade DPAA in soil.

[Photo-catalytical degradation of diphenylarsinic acid by TiO2 (P25)].

Diphenylarsinic acid (DPAA) is the major contaminant in environment polluted by abandoned chemical weapons. DPAA poses high risks to biota but remediation methods for this contaminant are rare. Previous research showed DPAA could be degraded within a short time by TiO2 (P25).

[Spectroscopic study of photocatalytic mechanism of methanol and CO2].

Ni-Ti-O/SiO2 catalyst was prepared by impregnation method, and its photocatalytic performance for carbonylation of methanol with CO2 was investigated under UV light. The in-situ IR, XPS and MS were carried out to analyze the possible photocatalytic reaction mechanism. Results indicated that the Ni-Ti-O/SiO2 exhibited good photocatalytic performance for carbonylation of methanol with CO2, the methanol conversion reached up to 24.