铁镧双金属MOF去除水体中的磷酸盐和Cr(Ⅵ)

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摘要采用快速高效的电沉积法制备了磁性铁镧双金属MOF (Fe/La-MOF)材料,并用于去除水中的磷酸盐和Cr (VI).结果显示:Fe/La等物质的量比,单独去除磷酸盐或Cr (VI)时,Fe/La-MOF投加量1g/L (除P)或2.5g/L (除Cr (VI)),pH值2~7(除P)或pH值2~11(除Cr (VI)),反应120min,磷酸盐(初始100mg P/L)或Cr (VI)(初始20mg Cr/L)的去除率分别达到94%或95%以上.Langmuir等温线能很好拟合Fe/La-MOF对磷酸盐或Cr (Ⅵ)的吸附,且理论最大吸附量分别是350.4mg P/g和33.4mg Cr/g.Fe/La-MOF吸附磷酸盐或Cr (Ⅵ)的行为更符合拟二级动力学,表明该过程以化学吸附为主;XPS、XRD、FTIR等表征结果进一步揭示:主要的吸附机理是发生在磷酸盐或Cr (Ⅵ)阴离子与Fe/La-OH之间的配体交换.另外,磁性Fe/La-MOF易于分离且在多次循环使用中保持较好的稳定性.Fe/La-MOF可同时用于去除磷酸盐和Cr (VI),pH值近中性,Fe/La-MOF加入量2.5g/L,反应120min,磷酸盐(初始25mg P/L)和Cr (VI)(初始20mg Cr/L)的去除率分别达到100%和92.2%.总之,Fe/La-MOF是一种可以快速制备的、具有良好吸附和稳定性能、宽大的pH值适用范围的高效吸附剂.

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关键词 ：双金属MOF, 磁性, 电沉积, 磷酸盐, Cr(Ⅵ)

Abstract：A magnetic Fe/La bimetallic MOF (Fe/La-MOF) material, which prepared by a rapid and efficient electrodeposition method, was applied for phosphates and Cr(VI) removal from water. The results indicated that the individual phosphate or Cr(VI) removal rates could reach over 94% for phosphate (initial concentration of 100mg P/L) or 95% for Cr(VI) (initial concentration of 20mg Cr/L) after 120 min reaction under the conditions of a equimolar ratio of Fe to La, Fe/La-MOF dosages of 1g/L (for phosphate) or 2.5g/L (for Cr(VI)) and ranges of pH 2~7 (for phosphate) or pH 2~11 (for Cr(VI)), respectively. The Langmuir isotherm model could fit the adsorption of phosphate or Cr(VI) by Fe/La-MOF well, with theoretical maximum adsorption capacities of 350.4mg P/g and 33.4mg Cr/g, respectively. The adsorption behavior of phosphate or Cr(VI) by Fe/La-MOF could be better described by pseudo-second-order kinetics model, implying that the process is mainly chemical adsorption. Characterization results of XPS, XRD and FTIR revealed that ligand exchange between phosphate or Cr(VI) anions and Fe/La-OH could be the main removal mechanism. Furthermore, the magnetic Fe/La-MOF would be easy separated with good stability through 3 cycles of use. The good performances on simultaneous removal of phosphate and Cr(VI) were also exhibited with the removal rates of 100% for phosphate (initial concentration of 25mg P/L)and 92.2% for Cr(VI) (initial concentration of 20mg Cr/L) after 120min reaction under a neutral pH and Fe/La-MOF dosage of 2.5g/L. In general, Fe/La-MOF is a highly efficient adsorbent for removing phosphate or Cr(VI) with greater adsorption capacities and good stability in a wider pH range.

Key words： bimetallic MOF magnetism electrodeposition phosphate Cr (VI)

收稿日期: 2024-02-01

PACS:

X703.1

基金资助:山西省专利转化专项计划项目(202202055)

通讯作者: 郭波,副教授,1226055501@qq.com E-mail: 1226055501@qq.com

作者简介: 金史怡(1999-),女,浙江绍兴人,太原理工大学硕士研究生,主要从事水污染控制方向的研究.793885983@qq.com.

引用本文:

金史怡, 郭波, 曹群, 冯凡, 陈彩玉, 王瑞麟. 铁镧双金属MOF去除水体中的磷酸盐和Cr(Ⅵ)[J]. 中国环境科学, 2024, 44(9): 4918-4928. JIN Shi-yi, GUO Bo, CAO Qun, FENG Fan, CHEN Cai-yu, WANG Rui-lin. Removal of phosphates and Cr (VI) from water by iron lanthanum bimetallic MOF. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(9): 4918-4928.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I9/4918

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