铁镧双金属MOF去除水体中的磷酸盐和Cr(Ⅵ)

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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)

Received: 01 February 2024

PACS:

X703.1

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	Articles by authors
	JIN Shi-yi
	GUO Bo
	CAO Qun
	FENG Fan
	CHEN Cai-yu
	WANG Rui-lin

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JIN Shi-yi,GUO Bo,CAO Qun等. Removal of phosphates and Cr (VI) from water by iron lanthanum bimetallic MOF[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(9): 4918-4928.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I9/4918

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