郭琳,刘晨,陈云嫩.基于催化臭氧氧化水溶液中氨氮的Mg/Mn催化剂 制备研究[J].有色金属工程,2018,8(3):.
基于催化臭氧氧化水溶液中氨氮的Mg/Mn催化剂 制备研究
Preparation of Mg/Mn Catalyst Based on Catalytic Ozonationfor Oxidizing Ammonium-nitrogen from Water
投稿时间:2017-06-21  修订日期:2017-08-20
DOI:
中文关键词:  氨氮  Mg/Mn复合  催化剂  催化臭氧氧化
英文关键词:Ammonium-nitrogen(NH4 -N)  Mg/Mn composite  catalyst  catalytic ozonation
基金项目:国家自然科学基金(51568023)
        
作者单位
郭琳 江西理工大学资源与环境工程学院
刘晨 江西理工大学资源与环境工程学院
陈云嫩 江西理工大学资源与环境工程学院
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中文摘要:
      采用均匀共沉淀法制备Mg/Mn复合金属氧化物催化剂,研究该催化剂对水中低浓度氨氮的催化降解性能。利用扫描电子显微镜(SEM)、氮吸附分析对制备的催化剂进行表征,研究制备工艺条件对催化剂微观结构、比表面积和对氨氮催化降解的影响,探讨了催化剂降解氨氮的机理。结果表明,500 ℃下煅烧4 h得到的Mg︰Mn摩尔比为8︰2的催化剂表现出较高的催化活性,且对气态含氮物质的选择性最好,催化剂成絮状结构,表面蓬松且粗糙,比表面积为31.8845 m2/g。Mg/Mn复合金属氧化物催化臭氧氧化氨氮的机理为Mg/Mn催化O3分解产生·OH,从而氧化降解氨氮。
英文摘要:
      The Mg/Mn composite metal oxide catalysts were prepared in method of homogeneous co-precipitation and their catalytic degradation on the low concentration of ammonium-nitrogen(NH4 -N) in the solution were investigated. The prepared catalysts were characterized by scanning electron microscopy (SEM) and nitrogen adsorption analysis, and the effects of preparation conditions on the microstructure, specific surface area and catalytic degradation on NH4 -N were studied. The mechanism of ammonia nitrogen degradation was discussed. The experimental results showed that the catalyst with Mg/Mn molar ratio of 8:2 calcined under 500 ℃ for 4 h have the higher catalytic activity and the best selectivity for the gaseous nitrogenous material. The catalyst has a flocculent structure, a fluffy and coarse surface, and the specific surface area is 31.8845 m2/g. The mechanism of Mg/Mn composite metal oxide catalytic ozonation for oxidizing NH4 -N from water was hydroxyl radicals produced by ozone’s decomposition.
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