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酞菁钴磺酸盐在纳米TiO2薄膜上的固载化及对亚甲基蓝的降解作用

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Abstract:

合成了单、双、三核酞菁钴磺酸盐[single-nuclearcobalt(Ⅱ)phthalocyaninetetrasulphonates,s-CoPc;bi-nuclearcobalt(Ⅱ)phthalocyaninehexasulphonates,b-CoPc;tri-nuclearcobalt(Ⅱ)phthalocyanineoctasulphonates,t-CoPc],并将其固载于纳米TiO2薄膜上,测量了s-CoPc,b-CoPc和t-CoPc水溶液的紫外可见光谱,利用红外光谱表征t-CoPc在纳米TiO2粉末上的吸附特性。以空气为氧化剂,比较了3种CoPc/纳米TiO2薄膜在可见光照射和黑暗条件下对亚甲基蓝(methyleneblue,MB)降解的光催化和催化活性。结果表明b-CoPc和t-CoPc的Q带最大吸收峰分别从s-CoPc的655nm红移至658nm和663nm,且t-CoPc可通过其中部分磺酸基固载于纳米TiO2薄膜上。MB降解实验结果表明3种CoPc均可以敏化纳米TiO2薄膜,明显提高其光催化活性与黑暗条件下的催化活性(其次序为t-CoPc>b-CoPc>s-CoPc)。将CoPc固载于纳米TiO2薄膜上可使纳米TiO2的光谱响应拓展到可见光区,且在降解MB过程中容易回收再利用。

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