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铁氮共掺杂生物炭对二级水溶解性有机物的吸附特性与长效性评价
摘要点击 1677  全文点击 492  投稿时间:2021-05-25  修订日期:2021-06-30
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中文关键词  铁氮共掺杂生物炭  吸附  二级水  溶解性有机物(DOM)  分级表征  固定床吸附柱
英文关键词  iron and nitrogen co-doped biochar  adsorption  secondary water  dissolved organic matter (DOM)  hierarchical characterization  fixed-bed adsorption column
作者单位E-mail
吴晨曦 西安建筑科技大学环境与市政工程学院, 西安 710055 1196487856@qq.com 
许路 西安交通大学人居环境与建筑工程学院, 西安 710049  
金鑫 西安交通大学人居环境与建筑工程学院, 西安 710049  
石烜 西安交通大学人居环境与建筑工程学院, 西安 710049  
金鹏康 西安建筑科技大学环境与市政工程学院, 西安 710055
西安交通大学人居环境与建筑工程学院, 西安 710049 
pkjin@xjtu.edu.cn 
中文摘要
      为经济高效地去除污水厂二级水中溶解性有机物(DOM),采用铁氮共掺杂生物炭材料(Fe-N-C)作为新型吸附剂,系统分析了该新型碳材料对于二级水DOM的吸附性能、动力学过程、选择性和作用机制.此外,通过固定床吸附装置深入考察了该吸附材料的长效性和重复利用性.结果表明,Fe-N-C对于二级水DOM具有突出的吸附性能,投加量仅为1.0 g·L-1时,TOC、UV254和UV280的去除率分别高达40.18%、76.92%和78.26%,远远高于纯生物炭和常规活性炭的吸附效果;吸附过程符合伪二级动力学和Freundlich吸附等温线模型,表明其吸附过程是涉及化合价和交换电子的多层化学吸附;三维荧光光谱、相对分子质量分布和树脂分级表征等分析结果表明,Fe-N-C对于二级水DOM中的不同组分具有选择吸附性;以Fe-N-C为核心的固定床吸附柱对二级水TOC、UV254和UV280的最大去除率高达94.09%、95.65%和97.18%,同时具有良好的稳定性,处理量达620倍床体积时才接近吸附饱和,但经再生热处理后,吸附性能得以显著恢复.研究结果有望为高效吸附水处理技术的进一步发展提供参考与借鉴.
英文摘要
      In order to economically and efficiently remove dissolved organic matter (DOM) in the secondary water of wastewater treatment plants, this study adopted iron-nitrogen co-doped biochar material (Fe-N-C) as a new adsorbent and systematically analyzed the effect of this new carbon material on the secondary water DOM, as well as the adsorption performance, kinetic process, selectivity, and mechanism of action. In addition, the long-term performance and reusability of the adsorption material were thoroughly investigated through a fixed-bed adsorption device. The results show that Fe-N-C had outstanding adsorption performance for secondary water DOM. When the dosage was only 1.0 g·L-1, the removal rates of TOC, UV254, and UV280 were as high as 40.18%, 76.92%, and 78.26%, respectively, which are far higher. Regarding the adsorption effect of pure biochar and conventional activated carbon, the adsorption process conformed to the pseudo-second-order kinetics and Freundlich adsorption isotherm model, indicating that the adsorption process is a multilayer chemical adsorption involving valence electrons and the exchange of electrons. The three-dimensional fluorescence spectroscopy, molecular weight distribution, and resin analysis results, such as classification and characterization, showed that Fe-N-C had selective adsorption for different components in the secondary water DOM. The fixed bed adsorption column with Fe-N-C as the core had the maximum removal rate of secondary water TOC, UV254, and UV280 as high as 94.09%, 95.65%, and 97.18%, respectively, and had good stability. It was close to adsorption saturation when the processing capacity reached 620 times the bed volume. However, after the regeneration heat treatment, the adsorption performance was remarkably restored. These results are expected to provide reference for the further development of high-efficiency adsorption water treatment technology.

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