高活性TiO_2光催化剂降解酸性红B的研究

以烷基氢氧化铵为水热反应助剂制备了锐钛矿相纳米TiO2晶粒,采用XRD、TEM、SAED等手段对所得产物进行了表征,并利用这种高活性光催化剂降解酸性红B废水;通过UV-Vis、TOC和HPLC等方法对脱色过程中中间产物的形成、变化和分解进行初步探讨。结果表明,该光催化剂具有良好的结晶和形貌;对酸性红B有着优良的脱色效果,在pH值为4、催化剂用量1.0g/L、光照60min后,可使质量浓度为50mg/L的酸性红B溶液的脱色率达到94%;光催化降解过程中pH值对中间产物的产生与分解速率有较大影响。

Degradation of acid red B by high activity TiO2 photocatalyst

Anatase TiO2 nanocrystalline particles was prepared byhydrothermal method with alkyl ammoniumhydroxide as assistant reagent.The product,ahigh activity photocatalyst was characterized by XRD,TEM and SAED,and then,was used to degrade acid red B wastewater;The formation,changes and degradation of the middle-products in process of decolorization were primarily discussed through UV-Vis,TOC,HPLC and some other methods.The results showed that,the said photocatalysthad well crystal and morphology,which could decolorize acid red B effectively,when the pH value was 4,the dosage of catalyst was 1.0g/L,after 60min of illumination,the decolorization rate of the acid red B solution whose mass concentration was 50mg/L reached 94%;in addition,pH value played a significant role in the formation and the degradation velocity of the middle products.