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摘要
在HF/乙醇电解液中,采用恒电压电化学阳极氧化法,将P型硅片制备成了多孔硅催化剂。以甲基橙模拟废水为目标物,分析了电化学阳极氧化条件对多孔硅光催化甲基橙脱色率的影响。结果表明:随着HF浓度、阳极氧化时间、电流密度和光照时间的增加,甲基橙的脱色率逐渐增大。当V(HF):V(乙醇)=1:1、阳极氧化时间为30min、电流密度为10mA/cm2以及光照时间为60min时,对甲基橙废水的脱色率较好。用十二烷基苯磺酸钠修饰的多孔硅对甲基橙废水有更高的脱色率。同直接催化相比,光催化甲基橙废水的脱色率提高到45.32%。同时对多孔硅表面形貌进行了表征。
Abstract
Porous silicon(PS) catalyst was prepared by the method of potentiostatic electrochemical anodization in an hydrofluoric acid(HF)/ethanol electrolyte solution.The effect of HF concentration,anodization time,current density and illumination time on the decolorization rate of methyl orange(MO) in wastewater was studied.The results showed that with increasing of HF concentration,anodization time,current density and illumination time,the decolorization rate of MO in wastewater would increase gradually.Decolorization experiment of MO were preferable at the condition of HF:C2H5OH as 1:1,anodization time as 20min,current density as 10mA/cm2 and illumination time as 1h,respectively.The higher photocatalytic decolorization rate was obtained by the modification of sodium dodecyl benzene sulfonate (SDBS).Comparing with direct photolysis,the photocatalysis of modified porous silicon can increase the decolorization rate of MO by 45.32%.Meantime,the micromorphology of PS was characterized.
关键词
多孔硅
/
阳极氧化
/
甲基橙
/
光催化
/
脱色
Key words
porous silicon
/
anodization
/
methyl orange
/
photocatalysis
/
decolorization
电化学阳极氧化条件对多孔硅及其光催化性能的影响研究[J].
化工新型材料, 2017, 45(9): 105-107 DOI:
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基金资助
辽宁省教育厅资助项目(L2013249)
