Surface oxidation state mediated oxygen vacancies of metal oxide enhance oxidase-enzyme mimic, catalytic, and photocatalytic activity of the catalyst. Herein, we prepared the mixed valence V₄O₇ (V⁺³/V⁺⁴), which was thermally (650 °C) oxidized to produce V₂O₅ (V⁺⁵) nanorods. For the first time, we demonstrate that vanadium oxides (V₄O₇ and V₂O₅) exhibit catechol oxidase-like activity using the in situ production of H₂O₂. In addition, both metal oxides exhibit photocatalytic activity for organic pollutants removal in absence and enhanced in presence of H₂O₂. Catalytic and photocatalytic activities were modulated by the change in surface oxidation sate and oxygen vacancies tuned through the facile charge immobilization on V₄O₇ (V⁺³/V⁺⁴) to the less active V₂O₅ (V⁺⁵). The V₄O₇ shows enzyme activity higher than the corresponding V₂O₅ nanorods. On the other hand, the mixed valance V₄O₇ (V⁺³/V⁺⁴) was superior photocatalyst for remediation of methylene blue as it completely removes the dye in less than 15 min in presence of visible light.

金属氧化物的表面氧化态介导的氧空位增强了催化剂的氧化酶-酶模拟，催化和光催化活性。在此，我们制备了混合价V ₄ O ₇（V ⁺³ / V ⁺⁴），将其热氧化（650°C）以生产V ₂ O ₅（V ⁺⁵）纳米棒。第一次，我们证明了使用原位产生的H ₂ O ₂，钒氧化物（V ₄ O ₇和V ₂ O ₅）表现出类似儿茶酚氧化酶的活性。。另外，两种金属氧化物在不存在下均表现出对有机污染物的去除的光催化活性，并且在存在H ₂ O _2时增强。催化活性和光催化活性通过表面电荷的固定和在V ₄ O ₇（V ⁺³ / V ⁺⁴）上固定为活性较低的V ₂ O ₅（V ⁺⁵）的氧空位的变化来调节。V ₄ O _7的酶活性高于相应的V ₂ O ₅纳米棒。另一方面，混合价V ₄ O ₇（V ⁺³ / V ⁺⁴）是用于修复亚甲基蓝的优良光催化剂，因为它在可见光存在下不到15分钟即可完全除去染料。