改性分子筛滤料制备及其同步去除水中氨氮和锰  

Preparation of Modified Molecular Sieve Filter Material and Simultaneous Removal of Ammonium Nitrogen and Manganese from Water

作　　者：胡耀鹏 郭英明 张建民 黄建雄 许伟 闫帅军 HU Yaopeng;GUO Yingming;ZHANG Jianmin;HUANG Jianxiong;XU Wei;YAN Shuaijun(School of Urban Planning and Municipal Engineering,Xi'an Polytechnic University,Xi'an 710600,China;China North China Design and Research Institute Co.,Ltd,Tianjin 300381,China)

机构地区：[1]西安工程大学城市规划与市政工程学院,陕西西安710600 [2]中国市政工程华北设计研究总院有限公司,天津300381

出　　处：《水处理技术》2022年第5期123-127,131,共6页Technology of Water Treatment

基　　金：陕西省自然科学基础研究计划项目(2021JQ-688);陕西省教育厅科研计划项目(21JK0650);博士科研启动基金(107020335)。

摘　　要：为了改善分子筛的表面性质,在中试过滤系统中,向进水中持续投加高锰酸钾、氯化锰等物质对分子筛进行改性,并探究其制备条件以及改性完成后的去除效果。结果表明:在进水中持续投加约1.5 mg/L的氯化锰和1.1~1.2 mg/L的高锰酸钾(理论值的70%~80%),在制备过程中分子筛表面会逐渐生成黑褐色的锰氧化物,待27 d后分子筛表面的锰氧化物完全覆盖,此时滤料制备完成,之后不再投加任何药剂。利用改性后的分子筛作为滤料,当进水中氨氮和锰的质量浓度为2 mg/L和1.5 mg/L时,去除率分别可达95.0%和93.3%。由扫描电子显微镜可知,改性后分子筛表面覆盖的锰氧化膜结构紧密、孔隙发达,比表面积明显增大;由能谱仪分析可知,改性后分子筛滤料的锰元素增加至4.16%,且氧元素的含量也由41.01%增加至46.15%,表明在分子筛表面已经成功负载锰氧化物。该锰氧化膜提高了分子筛表面的氧化性,可以对水中氨氮和锰等污染物起到催化氧化去除作用,从而将分子筛的反冲洗周期由原来的2 d提高至4 d。To improve the surface properties of the molecular sieve,potassium permanganate and manganese chloride were continuously added into the influent to modify the molecular sieve in a pilot-scale filtration system,and the preparation conditions and the removal effect after the modification were explored.The results showed that after the dosage of 1.5 mg/L of manganese chloride and 1.1~1.2 mg/L of potassium permanganate(70%~80%of the theoretical value)into the influent,the dark brown manganese oxide was formed gradually on the surface of molecular sieve during the preparation process.After 27 days,the manganese oxide on the surface of molecular sieve was covered completely.At this time,the filter material was prepared to use and no more chemicals would be added into the influent.Using the modified molecular sieve as the filter material,when the concentrations of ammonium nitrogen and manganese in the influent were 2 mg/L and 1.5 mg/L,the removal rates could be 95.0%and 93.3%,respectively.The structure of the manganese oxide film covered on the surface of modified molecular sieve was tight,with developed pores and significantly increasing specific surface area,characterizing by the scanning electron microscope.The analysis by X-ray photoelectron spectroscopy showed that the manganese element of the modified molecular sieve filter was increased to 4.16%,and the content of oxygen was also increased from 41.01%to 46.15%,indicating that manganese oxide had been successfully loaded on the surface of the molecular sieve.The oxidation for the surface of molecular sieve was improved by the manganese oxide film,which could remove pollutants such as ammonium nitrogen and manganese through the catalytic oxidation process,thereby increasing the backwash interval of the molecular sieve from 2 d to 4 d.

关 键 词：水处理 改性 分子筛 制备 氨氮和锰 

分 类 号：X703[环境科学与工程—环境工程]