<trans-title>Adsorption of U(VI)-CO<sub>3</sub>/Ca-U(VI)-CO<sub>3</sub> by Amidoxime-functionalized Hydrothermal Carbon</trans-title>

3. Effects of pH (a) and CO₃² (b) and Ca²⁺ concentration (c) on uranium adsorbed onto AO-HTC, breakthrough curves of soil column and AO-HTC column at different pH (d), CO₃^2- (e) and Ca²⁺ concentration (f)

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4. U(VI) speciation as a function of CO₃^2-concentration (a) and Ca²⁺ concentration (b) in water

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5. Thomas kinetic plots for the adsorption of U(VI) on red soils (a, c, e) and AO-HTC columns (b, d, f)

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6. Yoon-Nelson kinetic plots for the adsorption of U(VI) on red soils (a, c, e) and AO-HTC columns (b, d, f)

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Table 1. Parameters of Thomas and Yoon-Nelson models

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Table 1. Parameters of Thomas and Yoon-Nelson models

	pH	CO₃^2- /(mmol·L^-1)	Ca²⁺ /(mmol·L^-1)	Thomas model			Yoon-Nelson model
	pH	CO₃^2- /(mmol·L^-1)	Ca²⁺ /(mmol·L^-1)	K_Th/(´10^-3, mL·min^-1·g^-1)	q_o/(´10^-2, mg∙g^-1)	R²	K_YN/min^-1	τ/min	R²
Soil column	7.0	4	2	2.089	1.5	0.93	0.043	76	0.93
	7.5			2.143	1.3	0.97	0.042	67	0.97
	8.0			2.161	1.1	0.96	0.043	55	0.96
AO-HTC column	7.0	4	2	0.338	8.8	0.91	0.014	444	0.91
	7.5			0.367	7.4	0.83	0.007	371	0.83
	8.0			0.683	5.3	0.91	0.014	266	0.81
Soil column	8.0	1	2	1.475	1.5	0.95	0.029	75	0.95
		2		1.797	1.1	0.96	0.036	55	0.96
		3		1.509	1.5	0.87	0.031	76	0.87
		4		2.161	1.1	0.96	0.043	55	0.96
AO-HTC column	8.0	1	2	0.364	9.8	0.95	0.007	492	0.95
		2		0.727	7.8	0.90	0.015	392	0.90
		3		0.619	6.1	0.92	0.012	307	0.92
		4		0.683	5.3	0.91	0.014	266	0.91
Soil column	8.0	4	0.5	1.367	1.8	0.96	0.027	94	0.96
			1.0	1.805	1.4	0.98	0.036	73	0.98
			1.5	2.275	1.0	0.95	0.046	52	0.95
			2.0	2.161	1.1	0.96	0.043	55	0.96
AO-HTC column	8.0	4	0.5	0.211	11.1	0.80	0.004	558	0.80
			1.0	0.239	7.8	0.94	0.005	393	0.94
			1.5	0.257	6.6	0.94	0.005	330	0.94
			2.0	0.683	5.3	0.91	0.014	266	0.91

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Zhibin ZHANG, Runze ZHOU, Zhimin DONG, Xiaohong CAO, Yunhai LIU. Adsorption of U(VI)-CO₃/Ca-U(VI)-CO₃ by Amidoxime-functionalized Hydrothermal Carbon[J]. Journal of Inorganic Materials, 2020, 35(3): 352

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Paper Information

Category: RESEARCH PAPER

Received: Aug. 3, 2019

Accepted: --

Published Online: Jan. 27, 2021

The Author Email: LIU Yunhai (yhliu@ecit.edu.cn)

DOI:10.15541/jim20190397

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