改性绿沸石的制备及其吸附氨氮的性能研究

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英文篇名：Study on Modification of Green Zeolite and Its Adsorption of Ammonia Nitrogen 作者：黄添浩 ; 王趁义 ; 徐耀阳 ; 张凯龙 ; 王国贺 ; 李琳琳 英文作者：Huang Tianhao;Wang Chenyi;Xu Yaoyang;Zhang Kailong;Wang Guohe;Li Linlin;College of Biology and Environment, University of Zhejiang Wanli;Ningbo Shengqian Environmental Technology Development Co., Ltd.; 关键词：绿沸石 ; 碱改性 ; 热改性 ; 氨氮废水 ; 吸附动力学 ; 吸附机理 英文关键词：green zeolite;;alkali modification;;thermal modification;;ammonia nitrogen wastewater;;adsorption kinetics;;adsorption mechanism 中文刊名：非金属矿 英文刊名：Non-Metallic Mines 机构：浙江万里学院生物与环境学院;宁波晟乾环境技术开发有限公司; 出版日期：2019-03-20 出版单位：非金属矿 年：2019 期：02 基金：国家自然科学基金(21207036);; 浙江省自然科学基金(LY16C150002);; 宁波市科技惠民项目(2017C50010);; 浙江省“生物工程”一流学科开放基金项目(KF2018004);; 浙江省“生物工程”一流学科学生创新项目(CX2018011&CX2018012);; 浙江万里学院生态养殖模式与尾水水质调控科技特派团队项目;浙江万里学院引进人才重点项目(1741000530) 语种：中文; 页：26-29 页数：4 CN：32-1144/TD ISSN：1000-8098 分类号：X703

摘要

为了进一步提高绿沸石吸附材料的氨氮吸附性能,通过氢氧化钠预处理、热改性等手段制备了碱热改性绿沸石;采用静态试验的方法,考察了热改性时间、热改性温度、改性碱液用量、吸附水温等因素对改性绿沸石吸附氨氮性能的影响,并通过吸附动力学、吸附等温线、SEM、XRF等手段分析其吸附机理。结果表明:绿沸石的最佳改性条件是在35℃下以2 mol/L碱液改性后再于400℃下焙烧2.5 h;当氨氮废水质量浓度为25 mg/L时,此改性绿沸石的最佳吸附条件为温度30℃、振荡速度200 r/min,最大氨氮吸附量为9.21 mg/g,它比未改性绿沸石的最大氨氮吸附量4.36 mg/g提高了111.2%;用Freundlich和Langmuir等温模型、准一级、二级动力学对吸附过程拟合,结果表明绿沸石对氨氮的吸附是单层化学吸附和多层物理吸附共同作用的吸附-还原过程。
        In order to further improve the ammonia nitrogen adsorption performance of the green zeolite, the alkali heat-modified green zeolite was prepared by means of sodium hydroxide pretreatment and thermal modification.The effects of thermal modification time, thermal modification temperature, modified lye dosage and adsorption water temperature on the adsorption of ammonia nitrogen on modified green zeolite were investigated by static test. The adsorption mechanism was analyzed by adsorption kinetics, adsorption isotherms, SEM, XRF. The results showed that the best modification condition of green zeolite was pretreated by 2.0 mol/L NaOH solution at 35℃ and roasting at 400 ℃ for 2.5 h. The best adsorption conditions of green zeolite was prepared by 25 mg/L ammonia nitrogen at 30 ℃ and shaking at 200 r/min. The maximum ammonia nitrogen adsorption amount was 9.21 mg/g, which was the largest than unmodified green zeolite. Ammonia nitrogen adsorption amount of 4.36 mg/g increased by 111.2%.The Freundlich and Langmuir isothermal models, quasi-first-order and second-order kinetics were used to fit the adsorption process. The adsorption of ammonia nitrogen by smectite was the adsorption-reduction process of single-layer chemical adsorption and multi-layer physical adsorption.

引文

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