高铁酸钾氧化降解罗丹明(RhB)水溶液的研究

DEGRADATION OF RHODAMINE B SOLUTION WITH POTASSIUM FERRATE

利用高铁酸钾氧化降解罗丹明(RhB)水溶液.研究表明,pH值、反应时间及K2FeO4投加量等因素对RhB的降解效果均有显著影响.酸性条件有利于RhB的降解,K2FeO4投加量在nK2FeO4∶nRhB=2∶1时达到最优.pH=2.0时,初始浓度为100mol.l-1的RhB水溶液经K2FeO4氧化5min后,脱色率和CODCr去除率分别为55.64%和24.55%.通过对反应后溶液的荧光光谱分析和GC-MS分析,推测RhB首先被K2FeO4氧化为羟基化RhB阴离子(RhB.OH-),随后进一步被氧化开环.

In this paper, we studied the degradation of Rhodamie B （RhB） by use of K2FeO4. The degradation efficiency of RhB was determined as a function of pH, reaction time, initial concentration of K2FeO4. Acid condition, especially pH 2. 0 is preferred. Higher degradation efficiency was achieved when the initial of K2FeO4 to RhB was 2： 1. After 50 ml of 100 mg·l-1 RhB solution was oxidized by K2FeO4 for 5 min, the decolourisation rate of RhB reached up to 55.64% and CODCr reduced 24.55%. Fluorescence spectrum analysis and GC-MS analysis indicated that RhB was initially oxidized to RhB^·OH^- and then underwent ring cleavage to small molecules.