高令飞,蒋尊芳,周继承,殷 诚,尹静雅.微波催化剂MgFe2O4-Fe2O3微波催化氧化降解结晶紫废水[J].湖南大学学报:自然科学版,2015,42(12):74~79
微波催化剂MgFe2O4-Fe2O3微波催化氧化降解结晶紫废水
Degradation of Crystal Violet from Wastewater through Microwave-Enhanced MgFe2O4-Fe2O3 Catalytic Oxidation
  
DOI:
中文关键词:  微波催化  微波催化剂  MgFe2O4-Fe2O3  羟基自由基 (·OH)  结晶紫废水
英文关键词:microwave catalytic  microwave catalyst  MgFe2O4-Fe2O3  hydroxyl radical (·OH)  crystal violet (CV) from wastewate
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高令飞,蒋尊芳,周继承,殷 诚,尹静雅 (湘潭大学 化工学院 绿色催化与反应工程湖南省高校重点实验室湖南 湘潭 411105) 
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中文摘要:
      提出一种新型的、无需添加氧化剂处理结晶紫废水的方法.通过共沉淀晶化法制备微波催化剂MgFe2O4-Fe2O3,在微波辐照下降解结晶紫废水,考察了催化剂用量、微波功率、辐照时间对结晶紫去除率的影响.结果表明:在一定条件下,去除率随着催化剂用量的增加、微波功率的增大、微波辐照时间的延长而增加.当微波功率为800 W,辐照时间5 min,催化剂用量1 g/L时,处理200 mg/L的结晶紫废水,去除率可达99.3%.本文还对微波催化氧化机理进行了探究,通过添加不同氧化基团清除剂的实验发现,氧化基团清除剂的添加降低了结晶紫的去除率,并提出了该反应的微观机理:微波催化剂吸收电磁波发生光电效应, 产生电子和空穴对, 与水等作用产生·OH,·OH再氧化降解废水中的有机物.
英文摘要:
      A new degradation method for crystal violet (CV) from wastewater was proposed without adding any oxidant. The microwave catalyst of MgFe2O4-Fe2O3 was obtained through co-precipitation crystallization method, and its degradation performance for the wastewater containing CV was systematically evaluated under microwave irradiation, including catalyst dosage, microwave power and irradiation time. The results indicated that microwave catalyst MgFe2O4-Fe2O3 displayes excellent catalytic activity, and degradation efficiency for CV from a 200 mg/L wastewater can be highly up to 99.3% with microwave power of 800 W, catalyst dosage of 1 g/L, and irradiation time of 5 min. In addition, the mechanism for the microwave catalytic oxidation degradation was preliminary discussed, and hydroxyl radical (·OH) generated during the catalytic reaction acted as the dominant oxidant for the degradation, demonstrating from the experiment of adding different oxides as removal agents. Under microwave irradiation, microwave catalyst can effectively absorb electromagnetic wave to produce photo-electric effects with generation of electron-hole pairs (e-cb+h+vb), which will react with H2O molecules to produce ·OH, and then the formed ·OH groups oxidation can degrade the organic compounds existing in wastewater. The proposed microwave catalytic oxidation degradation is a new method for highly efficient degradation of organic wastewater.
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