采用聚乙烯醇调控的水热法合成了对全氟辛酸(PFOA)有高光催化活性的纳米针状Ga2O3.其颗粒长3-6 μm,宽100-200nm,具有较大的比表面积(25.95 m2/g)和纳米孔结构(4-25 nm).在普通紫外光照射下(λ=254 nm),纳米针状Ga2O3光催化降解纯水中PFOA的反应半衰期为18.2 min,PFOA的一级反应降解动力学常数为2.28h-1,分别为商品Ga2O3和TiO2作为催化剂时的7.5和16.8倍.此外,当纳米针状Ga2O3与真空紫外光(λ=185 nm)结合时,不仅可以更高效地降解纯水中的PFOA(反应速率常数4.03h-1),而且能有效消除废水中共存有机物的影响,从而高效分解废水中的PFOA(反应速率常数3.51h-1),且此方法的能耗远远低于文献报道的其他方法的能耗值.
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