<trans-title>Adsorption of Eu(III) on Alkalized Ti3C2Tx MXene Studied by Batch Experiment and Its Mechanism Investigation</trans-title>

Huan SONG; Lin WANG; Hong-Qing WANG; Wei-Qun SHI

doi:10.15541/jim20190073

Journal of Inorganic Materials, Volume. 35, Issue 1, 65(2020)

Adsorption of Eu(III) on Alkalized Ti₃C₂T_x MXene Studied by Batch Experiment and Its Mechanism Investigation

Huan SONG1... Lin WANG2, Hong-Qing WANG1,* and Wei-Qun SHI2,* |Show fewer author(s)

Author Affiliations

¹School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China

²Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(11)

1. XRD patterns of the synthesized Ti₃AlC₂, Ti₃C₂T_x, Na-Ti₃C₂T_x and Na-Ti₃C₂T_x-Eu

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2. SEM images of Na-Ti₃C₂T_x before (a-b), and after (c-d) adsorption of Eu(III), with EDS analysis resulted of Na-Ti₃C₂T_x before (e) and after (f) adsorption of Eu(III)

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3. Effect of sorbent dose on Eu(III) removal by Na-Ti₃C₂T_x (pH=(4.0±0.1), C₀=20 mg/L)

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4. Effect of solution pH and ionic strength on removal of Eu(III) by Na-Ti₃C₂T_x(a), Zeta potential of Na-Ti₃C₂T_x(b), and distribution of Eu(III) species in aqueous solution as a function of pH calculated using the MEDUSA program (c)

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5. Time-dependent adsorption of Eu(III) on Na-Ti₃C₂T_x (pH= (4.0±0.1), T = 293 K, m/V = 0.4 g/L) (a), and pseudo-second- order kinetic plots of Eu(III) on Na-Ti₃C₂T_x (b)

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6. (a) Isotherms of Na-Ti₃C₂T_x towards Eu(III) under the conditions of pH (4.0±0.1) and m/V=0.40 g/L, and (b) plot of lnK_dvs 1/T

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7. (A) Eu L₃ edge k³-weighted EXAFS spectra (solid lines) and the best theoretical fits (dots lines) of Eu-loaded Na-Ti₃C₂T_x samples under different solution pH, and (B) corresponding non-phase shift corrected Fourier transforms

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Table 1. Optimized parameters of pseudo-first-order and pseudo-second-order kinetic models
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Table 1. Optimized parameters of pseudo-first-order and pseudo-second-order kinetic models
Sample Pseudo-first-order model Pseudo-second-order model
Na-Ti₃C₂T_x k₁/min^-1 R² k₂/(g·mg^-1·min^-1) R²
0.0212 0.4111 0.1312 0.9999

Table 2. Fitting parameters of Langmuir and Freundlich models

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Table 2. Fitting parameters of Langmuir and Freundlich models

Models	Parameters	Temperature/K
Models	Parameters	298	306	314	322
Langmuir	q_m/(mg·g^-1)	54.05	57.14	66.67	88.50
	K_L/(L·mg^-1)	0.49	5.00	3.49	1.04
	R²	0.9931	0.9999	0.9981	0.9973
Freundlich	K_F/(mg^1-ⁿ·Lⁿ·g^-1)	33.52	40.87	50.37	60.87
	1/n	9.78	10.50	10.88	10.92
	R²	0.9436	0.9487	0.9212	0.9645

Table 3. Thermodynamic parameters for removal of Eu(III) by Na-Ti₃C₂T_x
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Table 3. Thermodynamic parameters for removal of Eu(III) by Na-Ti₃C₂T_x
Temperature/K ΔH/(kJ·mol^-1) ΔS/(J·mol^-1·K^-1) ΔG/(kJ·mol^-1)
298 24.539 134.81 -15.57
306 -16.65
314 -17.73
322 -18.80

Table 4. Fitting parameters extracted from least-squares fitting analysis of EXAFS spectra

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Table 4. Fitting parameters extracted from least-squares fitting analysis of EXAFS spectra

Sample	Path	CN^a	R^b/nm	σ^2c/(×10^-4, nm²)	ΔE^d/eV	R-factor^e
Eu³⁺(aq)	Eu-O	(9.0±0.6)	(0.243±0.001)	0.8	(3.9±0.6)	0.006
pH=4.0	Eu-O	(9.1±1.6)	(0.243±0.002)	0.9	(2.4±1.6)	0.019
pH=5.0	Eu-O	(8.7±1.4)	(0.243±0.001)	0.9	(2.6±1.5)	0.016
pH=6.0	Eu-O	(7.8±0.9)	(0.242±0.001)	1.0	(2.2±1.1)	0.008

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Huan SONG, Lin WANG, Hong-Qing WANG, Wei-Qun SHI. Adsorption of Eu(III) on Alkalized Ti₃C₂T_x MXene Studied by Batch Experiment and Its Mechanism Investigation[J]. Journal of Inorganic Materials, 2020, 35(1): 65

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Paper Information

Category: RESEARCH PAPER

Received: Feb. 15, 2019

Accepted: --

Published Online: Feb. 24, 2021

The Author Email: WANG Hong-Qing (hqwang2001cn@126.com), SHI Wei-Qun (shiwq@ihep.ac.cn)

DOI:10.15541/jim20190073

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Optimized parameters of pseudo-first-order and pseudo-second-order kinetic models

Table 1. Optimized parameters of pseudo-first-order and pseudo-second-order kinetic models

Table 2. Fitting parameters of Langmuir and Freundlich models

Table 2. Fitting parameters of Langmuir and Freundlich models

Table 3. Thermodynamic parameters for removal of Eu(III) by Na-Ti3C2Tx

Table 3. Thermodynamic parameters for removal of Eu(III) by Na-Ti3C2Tx

Table 4. Fitting parameters extracted from least-squares fitting analysis of EXAFS spectra

Table 4. Fitting parameters extracted from least-squares fitting analysis of EXAFS spectra

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Table 3. Thermodynamic parameters for removal of Eu(III) by Na-Ti₃C₂T_x

Table 3. Thermodynamic parameters for removal of Eu(III) by Na-Ti₃C₂T_x