活性炭活化过硫酸钠降解罗丹明B的规律研究

Decolorization Properties of RhB by Sodium Persulfate Activated with Activated Carbon

以罗丹明B作为目标污染物,研究了活性炭(AC)活化Na2S2O8(PS)产生硫酸根自由基的效果和机理,重点考察了PS初始浓度、溶液初始pH值、温度对AC活化过硫酸钠降解罗丹明B的影响.综合分析实验结果,对于PS/AC体系来说可以实现水中罗丹明B显著的降解,而罗丹明B的降解主要归因于氧化机制而不是吸附机制;随着PS初始浓度的增大,罗丹明B的去除率逐渐提高,但增长趋势减缓;随着初始pH的增加,罗丹明B的去除率逐渐降低;随着温度的升高,罗丹明B的去除率也随之提高,但去除率增加趋势减慢.另外对AC的重复使用后的活化效果进行了初步考察,发现AC具有较好的重复利用性能.

The degradation of RhB in aqueous solutions by the activated carbon （AC） catalyzed sodium persulfate （PS） is investigated in order to study the activation efficiency and mechanism of PS/AC system. It also examines the effect of initial PS concentration, initial pH and temperature on the degradation effect of RhB in the PS/AC system. The results show that RhB could be degraded by PS/ AC effectively mainly due to oxidation mechanism rather than adsorption mechanism. Moreover, the rates of RhB removals increase sharply with initial PS concentration, but reach a plateau afterward. The RhB removal efficiency is the highest at the lowest initial pH and decreases with an increase in pH. Elevated temperature could effectively enhance the RhB removal and accelerate to reach a steady- state condition within a . hotter reac , but growth trend of the removal rate slowes down. In s lion time addition, the activated properties of reused AC are investigated. It is found that AC has better reused property.