新型多孔Ti/BDD薄膜电极电化学氧化降解低浓度茜素红

New porous Ti/BDD film electrode for electrochemical oxidation Alizarin Red at a low concentration

运用热丝化学气相沉积(HFCVD)的方法制备了以多孔钛为基体的掺杂硼金刚石(porous Ti/BDD)薄膜电极,并测试了它的主要物理性质,SEM表明金刚石相生长良好并且能均匀地分布在基体表面和孔内,Raman光谱表明电极的金刚石相纯而且质量很高。采用循环伏安法研究了酸性条件下茜素红在多孔Ti/BDD电极上的电氧化行为。通过改变阳极电流密度、支持电解质Na2SO4的浓度来研究茜素红在多孔Ti/BDD电极上的电化学氧化降解的效果影响。结果表明:电流密度40 mA/cm2、支持电解质浓度0.5 mol/L为较理想的工艺参数,总电流效率达到30.2%。在相同条件下,发现多孔Ti/BDD薄膜电极氧化降解茜素红与平板Ti/BDD薄膜电极相比具有更高的电流效率。紫外可见光光谱证实了多孔Ti/BDD电极能够有效地电氧化降解茜素红。

Boron doped diamond films on porous Ti substrates were prepared by hot-filament chemical vapor deposition（HFCVD） and its main physical behaviors were studied. SEM analysis showed that diamond phase can grow well and distributed on the surface and the hole of the substrate. Ramen spectroscopy showed that the electrode had a pure and high quality diamond phase. The Alizarin Red electrochemical oxidation behavior had been studied with porous Ti/BDD electrode under acidic conditions by cyclic voltammetry. The effects of electrochemical oxidation degradation were investigated by change the anodic current density and the concentration of supporting electrolyte. The results showed that the anodic current density 40 mA/cm2,supporting electrolyte concentration was the ideal technological parameters and the general current efficiency was 30.2%. The results also showed that the porous Ti/BDD film electrode electrochemical oxidation Alizarin Red had a higher current efficiency compared with flat Ti/BDD film electrode in the same condition. The results of UV-visible spectroscopy detection confirmed that Alizarin Red can be degraded efficiently by electrochemical oxidation.