土壤中的多环芳烃(PAHs)对人体健康具有潜在的危害。然而,使用光催化技术来处理被PAHs污染的土壤仍然具有挑战性。因此,采用水热法和溶胶-凝胶法合成了TiO2/α-FeOOH复合光催化剂,并将其应用于光催化降解土壤中的荧蒽。形态学,元素,晶体结构,光学性质,电化学特性,并对TiO2/α-FeOOH的光催化活性进行了表征。结果表明,TiO2紧紧地固定在α-FeOOH表面,TiO2/α-FeOOH对模拟太阳光下土壤中氟蒽的光催化降解具有较高的光催化活性。TiO2/α-FeOOH的降解效率分别是TiO2和α-FeOOH的3.0和4.8倍,分别。这归因于通过增强电子和空穴的转移能力并加宽光谱吸收范围而增强的光催化能力。当土壤的pH为中性时,降解效率最高。水土比为10:1,催化剂用量为50mg/g。此外,事实证明,·O2-,h+,和1O2是TiO2/α-FeOOH光催化的主要活性物质。还提出了Z型电子转移结构的可能机理。检测了荧蒽的降解产物,并推导了降解途径。
Polycyclic aromatic hydrocarbons (PAHs) in soil are potentially harmful to human health. However, the use of photocatalysis technology to treat soil contaminated with PAHs remains challenging. Therefore, TiO2/α-FeOOH composite photocatalyst has been synthesized by hydrothermal method and sol-gel method and applied to photocatalytic degradation of
fluoranthene in soil. The morphology, elements, crystal structure, optical properties, electrochemical characteristics, and photocatalytic activity of TiO2/α-FeOOH have been characterized. Results showed that TiO2 is tightly fixed on the surface of α-FeOOH, and TiO2/α-FeOOH had higher photocatalytic activity on photocatalytic degradation of
fluoranthene in soil under simulated sunlight. The degradation efficiency of TiO2/α-FeOOH is 3.0 and 4.8 times higher than that of TiO2 and α-FeOOH, respectively. This is attributed to enhanced photocatalytic ability by enhancing the transfer capacity of electrons and holes and broadening the spectrum absorption range. The highest degradation efficiency was achieved when the pH of the soil is neutral, the ratio of water/soil is 10:1, and the dosage of catalyst is 50 mg/g. In addition, it was proved that •O2-, h+, and 1O2 are the main active substances in the photocatalysis of TiO2/α-FeOOH. The possible mechanism of a Z-type electron transfer structure was also proposed. The degradation products of
fluoranthene were detected, and the degradation pathway was deduced.