【摘要】 研究了Cu2+-Mn2+-H2O2体系催化氧化降解染料罗丹明B的效果。实验结果表明,Cu2+-Mn2+-H2O2体系的罗丹明B降解率比H2O2体系、Mn2+-H2O2体系和Cu2+-H2O2体系有显著提高,反应120min后罗丹明B降解率接近100%。对于Cu2+-Mn2+-H2O2体系,最佳罗丹明B降解条件:溶液pH为5,反应温度为45℃,质量浓度为10mg/L的罗丹明B溶液体积100mL,浓度为0.01mol/L的硫酸铜溶液加入量5.0mL,浓度为0.01mol/L的硫酸锰溶液加入量3.0mL,体积分数为30%的H2O2溶液加入量1.5mL。在此条件下罗丹明B降解的反应速率常数最大,为0.042 28min-1,其拟合相关系数为0.999 12。罗丹明B降解符合一级动力学模型。更多还原

【Abstract】 The degradation of rhodamine B by catalytic oxidation in Cu2+-Mn2+-H2O2 system was studied.The experimental results indicate that comparing with H2O2 system,Mn2+-H2O2 system and Cu2+-H2O2 system,the degradation rate of rhodamine B in Cu2+-Mn2+-H2O2 system is greatly increased,which is near 100% after 120 min of reaction.The optimum conditions for rhodamine B degradation are as follows: solution pH 5.0,reaction temperature 45 ℃,rhodamine B mass concentration 10 mg/L,rhodamine B solution(10 mg/L) volume 100 mL,copper sulphate sulotion(0.01 mol/L) dosage 5.0 mL,manganese sulphate solution(0.01 mol/L) dosage 3.0 mL,H2O2 solution(30% of volume fraction) dosage 1.5 mL.Under these conditions,the biggest reaction rate constant for rhodamine B degradation is 0.042 28 min-1,with 0.999 12 of fitting correlation coefficient.The degradation of rhodamine B in Cu2+-Mn2+-H2O2 system accords well with the first-order kinetics model.更多还原