Selective Adsorption of Scandium by （2-Ethylhexylamino） Methyl Phosphonic Acid Mono-2-Ethylhexyl Ester Impregnated Resin and Its Application

doi:10.19894/j.issn.1000-0518.240262

Chinese Journal of Applied Chemistry ›› 2025, Vol. 42 ›› Issue (1): 95-106.DOI: 10.19894/j.issn.1000-0518.240262

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Selective Adsorption of Scandium by （2-Ethylhexylamino） Methyl Phosphonic Acid Mono-2-Ethylhexyl Ester Impregnated Resin and Its Application

Jian-Feng YANG¹^,², Yan-Ling LI¹(), Jing-Lu HAN¹^,², Song-Song LI¹^,², Wu-Ping LIAO¹^,²^,³()

^1.State Key Laboratory of Rare Earth Resource Utilization，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，China
^2.School of Applied Chemistry and Engineering，University of Science and Technology of China，Hefei 230026，China
^3.Ganjiang Innovation Academy，Chinese Academy of Sciences，Ganzhou 341000，China

Received:2024-08-13 Accepted:2024-12-19 Published:2025-01-01 Online:2025-01-24
Contact: Yan-Ling LI,Wu-Ping LIAO
About author:wpliao@ciac.ac.cn；
liyanling@ciac.ac.cn
Supported by:
the National Natural Science Foundation of China(92262301)

Abstract

Abstract:

The （2-ethylhexylamino） methyl phosphonic acid mono-2-ethylhexyl ester （HEHAMP） impregnated resin was prepared by loading α-amino acid phosphine extractant， known as HEHAMP， onto macroporous resin Pre-XAD-16. The study investigates the adsorption properties of scandium in a sulfuric acid medium， examining the impacts of reaction time， acidity， concentration of hydrogen sulfate ions， resin dosage and temperature. It was found that the adsorption capacity of scandium increased gradually with the increase of reaction time. Under high acidity conditions， the adsorption rate of Sc³⁺ by SIRs-HEHAMP impregnated resin slightly decreased with increasing acidity， while within the pH range there was almost no effect on the adsorption rate of Sc³⁺. During the adsorption process， HSO₄^- did not participate in coordination. Temperature had almost no effect on the adsorption of Sc³⁺. The adsorption process of Sc³⁺ by SIRs-HEHAMP followed a pseudo-second-order kinetic model. The saturated adsorption capacity of the resin for scandium （expressed as Sc₂O₃） was 36.29 mg/g. Infrared spectroscopy and TG-DSC characterization were conducted on SIRs-HEHAMP impregnated resin， HEHAMP extractant， and the macroporous resin Pre-XAD-16. The results indicated that HEHAMP was successfully impregnated onto the supporting matrix Pre-XAD-16. The application of HEHAMP impregnated resin to the adsorption and recovery of Sc（Ⅲ） from a simulated sulfuric acid leaching solution of red mud was also explored. The adsorption rate of Sc（Ⅲ） was determined to be 51.71%， while that of Ti（Ⅳ） was 42.50% and Al（Ⅲ） showed negligible adsorption，the adsorption rates for Fe（Ⅲ） and rare earth ions were below 20%， and the separation factor between Sc（Ⅲ） and Ti（Ⅳ）（SF_（Se/Ti）） was 1.45. By introducing 6% （mass percent） hydrogen peroxide， the adsorption rate of Sc（Ⅲ） improved to 63.17%， the adsorption rates of Ti（Ⅳ） and Fe（Ⅲ） weredecreased， while other metal ions showed negligible adsorption. The separation factors between Sc（Ⅲ） and Ti（Ⅳ）（SF_（Se/Ti）） reached 6.94， indicating an enhancement in selectivity for scandium over titanium in the adsorption process.

Key words: （2-Ethylhexylamino） methyl phosphonic acid mono-2-ethylhexyl ester, Scandium, Impregnated resin, Adsorption, Separation

CLC Number:

O658.1

Jian-Feng YANG, Yan-Ling LI, Jing-Lu HAN, Song-Song LI, Wu-Ping LIAO. Selective Adsorption of Scandium by （2-Ethylhexylamino） Methyl Phosphonic Acid Mono-2-Ethylhexyl Ester Impregnated Resin and Its Application[J]. Chinese Journal of Applied Chemistry, 2025, 42(1): 95-106.

Figures/Tables 12

Fig.1 Effect of reaction time on the Sc3+ adsorption

Fig.2 Effect of the solution acidity of the solution on the Sc3+ adsorption （（A） high acidity and （B） low acidity）；（C） Effect of the aqueous acidity on the extraction of Sc3+；（D） Effect of HSO4- concentration on the Sc3+ adsorption

Fig.3 Effect of amount of impregnated resin on the Sc3+ adsorption

Fig.4 Adsorption of Sc3+ ions （calculated by oxides） by SIRs-HEHAMP impregnated resin with different extractant loading

Table 1 Adsorption property of different impregnated resin for Sc3+ in sulfuric acid medium

Impregnated resins	Extractant	Extractant loading/（mmol·g^-1）	Adsorption capacity ^a /（mg·g^-1）	Acidity/（mol·L^-1 H₂SO₄）	Equilibrium time/min	Ref.
TP-272	Cyanex272	-	17.01	pH=2.5	720	［18］
TRPO/SiO₂-P	Cyanex923	0.89	20.40	5	120	［19］
HDEHP/SiO₂-P	P204	0.803	21.55	5	5	［25］
SIRs-HEHAMP	HEHAMP	0.72	36.29	0.44	60	This work

Fig.5 FT-IR spectra of （a） HEHAMP，（b） Pre-XAD-16，（c） SIRs-HEHAMP and （d） Sc-SIRs

Fig.6 TG-DSC curves of Pre-XAD-16 （A）， HEHAMP （B） and HEHAMP impregnated resin（SIRs-HEHAMP）（C）

Fig.7 Effect of temperature on the Sc3+ adsorption

Fig.8 Effect of reaction time on the Sc3+ adsorption modeled by pseudo-second-order model

Table 2 Kinetic parameters of the pseudo-first-order kinetic equation and the pseudo-second-order kinetic equation for adsorption of Sc3+ by SIRs-HEHAMP impregnated resin

Pseudo-first-order model parameters			Pseudo-second-order model parameters
q_{（e，cal）}/（mg·g^-1）	k₁/min^-1	R²	q_{（e，cal）}/（mg·g^-1）	k₂/（g·mg^-1·min^-1）	R²
5.366	73.52	0.825	14.49	2.653×10^-3	0.998

Fig.9 Adsorption of each metal ions in simulated sulfuric acid leaching solution of red mud by SIRs-HEHAMP impregnated resin

Fig.10 Effect of hydrogen peroxide on the adsorption rate of each metal ion in simulated sulfuric acid leaching solution of red mud

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Selective Adsorption of Scandium by （2-Ethylhexylamino） Methyl Phosphonic Acid Mono-2-Ethylhexyl Ester Impregnated Resin and Its Application

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