In this study, 2-methylisoborneol (2-MIB) and geosmin (GSM) were degraded through photocatalytic oxidation process. For 2-MIB degradation under visible light irradiation, the highest removal rate was obtained in the presence of the 0.001% Fe – 0.5% N co-doped TiO₂ calcined at 500 °C. The removal rates of 2-MIB and GSM were significantly affected by the wavelength of the lamp used during the oxidation, with the effective order of 254 nm > 365 nm > 420 nm > 475 nm. Higher steady-state concentration of ·OH, which was obtained at shorter wavelength, led to higher T&O removal efficiency. The degradation intermediates of 2-MIB and GSM during the photocatalytic oxidation, including a series of alcohols, aldehydes and ketones, were associated with the dehydration and ring-opening pathways. In most cases, for 2-MIB photocatalytic degradation, intermediates with ring structure were yielded under visible light, while the chain compounds tended to be generated under UV irradiation. However, intermediate products of GSM were not varied from each other significantly when the wavelength changed. The abundances of the GSM degradation intermediates were larger than those of the 2-MIB degradation intermediates because GSM was easier to be oxidized than 2-MIB. The apparent degradation rates of 2-MIB and GSM in real water were lower than those in deionized water, and the humic substances in real water were decomposed into low-molecular weight substances.

在这项研究中，2-甲基异冰片酚（2-MIB）和土臭素（GSM）通过光催化氧化过程被降解。对于可见光照射下的2-MIB降解，在0.001％Fe – 0.5％N共掺杂TiO ₂的存在下可获得最高去除率在500°C下煅烧。2-MIB和GSM的去除率受氧化过程中所用灯的波长的影响很大，有效顺序为254 nm> 365 nm> 420 nm> 475 nm。在较短波长下获得的更高的·OH稳态浓度，导致更高的T＆O去除效率。2-MIB和GSM在光催化氧化过程中的降解中间体，包括一系列的醇，醛和酮，与脱水和开环途径有关。在大多数情况下，对于2-MIB光催化降解，在可见光下会生成具有环结构的中间体，而链状化合物则倾向于在UV辐射下生成。但是，当波长改变时，GSM的中间产物彼此之间并没有显着变化。GSM降解中间体的丰度大于2-MIB降解中间体的丰度，因为GSM比2-MIB更容易被氧化。实际水中2-MIB和GSM的表观降解率低于去离子水中的降解率，并且真实水中的腐殖质被分解为低分子量物质。