环境化学
刘咏,魏巍,赵仕林,张爱平,张宇.稀土/Y分子筛多相催化电解氧化深度去除渗滤液中难降解有机物[J].环境科学学报,2010,30(4):806-813
稀土/Y分子筛多相催化电解氧化深度去除渗滤液中难降解有机物
- In-depth removal of the non-degradable organic compounds in Leachate by RE/Y zeolite heterogeneous catalytic electro-oxidation
- 基金项目：四川省教育厅自然科学基金资助项目(No.08zc024);四川省科技厅科研项目(No.07JY029-140)
- 作者
- 单位
- 刘咏
- 四川师范大学化学与材料科学学院, 成都 610066
- 魏巍
- 西南交通大学环境科学与工程学院, 成都 610031
- 赵仕林
- 四川师范大学化学与材料科学学院, 成都 610066
- 张爱平
- 四川师范大学化学与材料科学学院, 成都 610066
- 张宇
- 四川师范大学化学与材料科学学院, 成都 610066
- 摘要：采用浸渍和焙烧法制备了以Y分子筛为载体的几种稀土催化剂,并用玻璃纤维包埋催化剂形成反应床体,构建稀土多相催化电解氧化体系,探索这一体系对垃圾渗滤液中难降解有机物的去除效果.同时,以COD值为控制指标,考察了焙烧温度、浸渍液金属离子浓度、稀土元素种类对电催化活性的影响.最后,用SEM和XRD等手段对催化剂的微观结构、表面形貌进行了表征,并与稀土/γ-Al2O3催化剂的电催化活性和结构进行了比较.结果表明,Y分子筛中引入稀土元素后没有破坏Y分子筛的晶体结构,稀土/Y分子筛催化剂的表面并没有检测到稀土氧化物的物相,稀土/γ-Al2O3催化剂的表面形成了明显的稀土氧化物衍射峰;稀土/Y分子筛催化剂的最佳制备条件为焙烧温度400℃,浸渍液中金属离子质量分数1%～3%,负载金属为铈;所制备的稀土/Y分子筛催化剂具有良好的电催化活性和稳定性,其活性高于稀土/γ-Al2O3催化剂.
- Abstract：Rare-earth catalysts (RE/Y) based on the Y-type molecular sieve carrier were prepared by an impregnation-calcination method and used to remove organics from landfill leachate. SEMimages show that the structure of the Y-type molecular sieve remains after the introduction of rare earth elements. According to the XRDpatterns,no rare earth oxide phases can be observed on the surface of the Y-type molecular sieve carrier,while the characteristic diffraction peaks of rare earth oxide are detected on the surface of RE/γ-Al2O3 catalysts. Aheterogeneous catalytic oxidation system using electrolysis was built by embedding the catalysts in glass fibers to develop a reaction bed. The effects of calcination temperature,metal ion concentration in the impregnated liquid and rare-earth species on the activity of the catalysts were studied and their effectiveness in removing the organic compounds in landfill leachate was evaluated by measuring COD. The optimum technological conditions for the preparation of the RE/Ycatalysts were calcination at 400 ℃,1%～3% metal ion mass fraction in the impregnated liquid using cerium as the rare earth element. Compared to the RE/γ-Al2O3 catalysts,the RE/Ycatalysts possess better electro-catalytic activity and stability.
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