无机盐阴离子对光催化降解活性大红W-2BR的影响

Effect of Inorganic Salt Added on Photocatalytic Degradation of Reactive Scarlet W-2BR

以纳米TiO_(2)为催化剂,依托自主设计的降膜光催化反应器,研究了无机盐阴离子对光催化降解活性大红W-2BR的影响。在染料浓度和酸碱度最佳条件下,通过掺加一系列不同浓度的无机盐(NaCl、Na_(2)SO_(4)、NaBr、KBrO_(3)、KClO_(3)、KIO_(3)),依据ln(C_(0)/C)和时间的关系获得了相应的染料光催化降解反应动力学方程与表观速率常数K。结果表明,在最佳pH值(碱性为8.0,酸性为3.2)条件下,加入不同种类、不同浓度的无机盐对活性大红W-2BR的光催化降解动力学有显著的影响,即抑制作用、促进作用,抑制与促进作用并存。

The photocatalytic degradation of reactive scarlet W-2BR with inorganic salt had been investigated using nano-TiO_(2) as photocatalyst in falling-film photocatalytic reactor designed.Under the fixed dye concentrations and pH values,a series of inorganic salt,i.e.,NaCl,Na_(2)SO_(4),NaBr,KBrO_(3),KClO_(3),and KIO_(3) with various concentrations,were added in photocatalysis.According to the relationship between Ln(C_(0)/C) and illumination time,the kinetics equations and apparent rate coefficients were obtained.The results indicated that the addition of inorganic salt had obvious effects on the degradation of W-2BR,and the photocatalytic degradation reaction was approximated to a first-order kinetics reaction.Under acidic conditions(pH=3.2) and alkaline conditions(pH=7.9) respectively,the addition of NaCl,Na_(2)SO_(4),NaBr,KBrO_(3),KClO_(3),and KIO_(3) inhibited or promoted the photocatalytic degradation of W-2BR.