Study on adsorption effect and mechanism of uranium by hydroxyapatite modified bentonite

ZHANG Yishuo; ZHOU Zhongkui; LI Longxiang; GUO Yadan; SUN Zhanxue

doi:10.13801/j.cnki.fhclxb.20230314.003

Volume 40 Issue 12

Dec. 2023

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ZHANG Yishuo, ZHOU Zhongkui, LI Longxiang, et al. Study on adsorption effect and mechanism of uranium by hydroxyapatite modified bentonite[J]. Acta Materiae Compositae Sinica, 2023, 40(12): 6740-6755. doi: 10.13801/j.cnki.fhclxb.20230314.003

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ZHANG Yishuo, ZHOU Zhongkui, LI Longxiang, et al. Study on adsorption effect and mechanism of uranium by hydroxyapatite modified bentonite[J]. Acta Materiae Compositae Sinica, 2023, 40(12): 6740-6755. doi: 10.13801/j.cnki.fhclxb.20230314.003

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Study on adsorption effect and mechanism of uranium by hydroxyapatite modified bentonite

doi: 10.13801/j.cnki.fhclxb.20230314.003

ZHANG Yishuo^{1, 2
,},
ZHOU Zhongkui^{1, 2
,
,},
LI Longxiang^{1, 2},
GUO Yadan^{1, 2},
SUN Zhanxue^{1, 2}

1.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
2.
School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, China

Funds: National Natural Science Foundation of China (41662024); Key Projects of Jiangxi Province Key R&D Programme (20212BBG71011)

Received Date: 2023-02-01
Accepted Date: 2023-03-03
Rev Recd Date: 2023-02-26

Available Online: 2023-03-16

Publish Date: 2023-12-01

Abstract

Abstract

With the development and efficient utilization of nuclear energy in China, uranium has become one of the common pollutants in surface water, groundwater and soil. The removal of U(VI) from uranium-containing wastewater has become an urgent environmental problem to be solved. Hydroxyapatite modified bentonite composite hydroxyapatite modified bentonite (HAP/BTN) was successfully prepared by a simple one-step hydrothermal method using bentonite, disodium hydrogen phosphate and calcium nitrate as raw materials. The adsorption performance of HAP/BTN on uranium in wastewater was investigated. The effects of pH, rotation speed, temperature, dosage and time on the adsorption performance were discussed by orthogonal test. The results showed that under the conditions of pH=6.0, rotation speed=100 r·min⁻¹, room temperature (298.15 K), HAP/BTN dosage of 1 g·L⁻¹ and adsorption time t=30 min, the removal rate of 10 mg·L⁻¹ uranium-containing wastewater could reach 98%, and the maximum adsorption capacity was 186.45 mg·g⁻¹. The adsorption process was more in line with the Langmuir model and pseudo-second-order kinetics. Thermodynamic parameters show that the adsorption of uranium on HAP/BTN was a spontaneous endothermic process, combined with XPS and XRD results, confirmed that the adsorption of uranium by HAP/BTN was mainly attributed to complexation reaction, chemical adsorption, electrostatic and ion exchange.
- bentonite,
- hydroxyapatite,
- uranium wastewater,
- adsorption,
- U(VI)
Long Abstrsct
Innovation Points

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References(37)

References

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