复合材料HAP@nZVI对Mn(Ⅱ)的吸附性能与机理

doi:10.11896/cldb.23020165

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Abstract Hydroxyapatite and nano-zero-valent iron (HAP@nZVI) composites were prepared by liquid phase reduction method. The treatment effect and mechanism of simulated Mn (II) contaminated groundwater was investigated by static batch tests in laboratory. The characterization results show that the surface of HAP@nZVI composites is uneven and the composites exhibit well-developed porous structure, and nZVI is unevenly distributed in HAP surface and voids. Static batch test results show that under the conditions of solution pH=5, composite dosage 0.36 g/L and reaction time t=180 min, HAP@nZVI composites has the best adsorption effect on Mn(Ⅱ). The maximum adsorption capacity of Mn(Ⅱ) reaches 31.4 mg·g^-1 within the range of the test conditions. The quasi-second-order kinetic model and Langmuir adsorption isotherm model can well describe the adsorption process of Mn(Ⅱ) by HAP@nZVI composites, indicating that the adsorption process belongs to single-layer adsorption and is mainly controlled by chemical adsorption. After the reaction, the overall structure of the composite did not change greatly, and -OH, Fe-O, and P-O groups all participate in the reaction. The adsorption mechanism of Mn(Ⅱ) by HAP@nZVI can be further confirmed by XPS characterization. The shift of binding energy about oxygen O 1s and phosphorus P 2p indicate that surface complexation occurs. The dissolution of iron and the disappearance of Fe⁰ indicate the existence of REDOX reaction. The decrease in the peak strength of the Ca 2p orbital indicates the pre-sence of ion exchange. Finally, the adsorption properties of HAP@nZVI composites and reported adsorbents for manganese ions were compared, and the results show that the material in this study has good adsorption properties.

Key words： HAP@nZVI composites Mn(Ⅱ) static batch test adsorption

Published: 25 August 2024 Online: 2024-09-10

CLC number:	X524
	X591

Fund:Natural Science Foundation of Jiangxi Province(20202BABL204069) and State Key Laboratory of Nuclear Resources and Environment Autonomous Fund(2020Z06).

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	PENG Huijing
	ZHANG Weimin
	WANG Yugang
	LU Qiyuan
	WANG Xinyu

Cite this article:

PENG Huijing,ZHANG Weimin,WANG Yugang, et al. Adsorption Performance and Mechanism of Hydroxyapatite@Nano-Zero-Valent Iron Composites on Mn(Ⅱ)[J]. Materials Reports, 2024, 38(16): 23020165-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23020165 OR http://www.mater-rep.com/EN/Y2024/V38/I16/23020165

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