JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 4
·2195-2206
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IF 1.5
Li Junze,Zhao Chuang,Guo Wenbin,Gao Yang,Liu Tingting,Zhou Yu,Hou Hongguo,Jiao Caishan,Zhang Meng
Using DMDODGA as the carrier, the transportation and separation behavior of Eu(III) and La(III) were studied using a plate-type supported liquid membrane. La(III) and Eu(III) reach their maximum transport rates at feed phase nitric acid concentrations of 2 and 4 mol/L, which are 72.41 (± 2.12)% and 77.80 (± 2.45)%; Increasing the concentration of NO 3 − in feed phase will promote the transport of both ions. The change of HNO 3 concentration in feed phase had major effect on the separation of Eu(III)/La(III), and the co-transport of Eu(III)/La(III) was observed when the concentration of NO 3 − was 3 mol/L.
研究领域:
化学工程
·
分离科学
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ibrahim El-Tantawy El-Sayed,Xingmei Lu,Jiayu Xin,Azza A. Al-Ghamdi,Enas A. Imam,Hamada B. Hawash,Ahmed A. Galhoum,S. Wageh
Two α-aminophosphonate anlages (methyl- and phenyl-derivatives, MeAP and PhAP, respectively) were synthesized via an in-situ reaction. Moreover, their corresponding sand nanocomposites, MeAPNC and PhAPNC, respectively, were prepared using an eco-friendly, inexpensive and facile solid-state synthetic route. These materials were extensively characterized by CHNSP/O, XRD, FTIR, SEM-EDX, TEM, and PZC. Lanthanum sorption characteristics were investigated and compared through the study of pH dependence (optimal pH: 4.5), equilibration time (achieved at 120 and 90 min for α-APs and nanocomposites, respectively), and sorption isotherms. The Sips isotherm and pseudo-second-order (PSORE) kinetics were the optimal models for fitting the experimental data. Sorption isotherms showed that methyl-derivatives (≈1.29–1.359 mmol/g) were more effective than their corresponding phenyl-derivatives (≈0.941–0.986 mmol/g) due to steric hindrance, acid-base differences, and inductive effects. Sorbents showed appreciated stability with just a 4.5–10.5 % loss in performance over six reuse cycles using HCl (0.2 M). Notably, sand incorporation slightly increased capacity with half-organic-portion in composites, as well as enhanced kinetics and regeneration efficiency. La(III) sorption is spontaneous, exothermic, and increases randomness across all sorbents. Finally, the prepared sorbents have proven effective sorption for Nd(III) beside La(III) with high selectivity from acidic complex monazite liquor.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiaming Wang,Minxin Shi,Yuanyuan Qin,Yuhua Huang,Xiancai Li,Xiaohua Cao
The enrichment and recovery of low concentration rare earth ions from wastewater resources has become an important research direction to achieve high quality utilization of rare earth resources. In this experiment, graphitic carbon nitride was used as the substrate, which was firstly compounded with Fe 3 O 4 to become magnetic graphitic carbon nitride material by alcohol heat method, and then in situ compounded with ZIF-8 in aqueous phase at room temperature to form the composite g-C 3 N 4 /Fe 3 O 4 @ZIF-8. Finally, the composite was characterized. The adsorption performance of g-C 3 N 4 /Fe 3 O 4 @ZIF-8 and the control g-C 3 N 4 /Fe 3 O 4 and ZIF-8 for La(III) under various conditions was investigated by adsorption experiment. In addition, the types and mechanism of La(III) adsorption were discussed by kinetic, isothermal adsorption line and thermodynamic modeling studies. Finally, the stability performance and reusability of the composite were evaluated by regeneration experiments. The result show that g-C 3 N 4 /Fe 3 O 4 @ZIF-8 has good adsorption performance on lanthanide ions. g-C 3 N 4 /Fe 3 O 4 @ZIF-8 reached adsorption equilibrium at about 20 min. When pH is 6 and the solid–liquid ratio of adsorbent is 0.25 g/L, the adsorption amount was 176.68 mg/g. g-C 3 N 4 /Fe 3 O 4 @ZIF-8 had good selectivity for lanthanum(III), and it retains 81 % of initial adsorption performance after five times of reuse.
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CELLULOSE
·
2020
·Vol. 27
·期 6
·3379-3390
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IF 4.21
Zhang Yi,Zheng Xudong,Bian Tingting,Zhang Yuzhe,Mei Jinfeng,Li Zhongyu
Abstract The purpose of the paper is to achieve adsorption and secondary application of La(III) through strong coordination ability of phosphate groups and La(III). Firstly, cellulose nanocrystals (CNCs) were phosphorylated in two solvents (water and molten urea). p-CNC(water)/MWCNT and p-CNC(urea)/MWCNT thin films were successfully synthesized by using p-CNCs as film units based on EISA method. The addition of multi-wall carbon nanotube was to improve thermal stability and repeatability of films and carboxyl groups thereon could also involve in the coordination of La(III). Adsorption experiments show that, at pH 4.0, adsorption capacities of p-CNC(water)/MWCNT and p-CNC(urea)/MWCNT films were 21.23 and 44.71 mg g −1 , with half equilibrium time ( t 1/2 ) of 23.06 and 4.87 min. Repeatability tests show that the adsorption capacities of films remained above 82% of the maximum adsorption capacities after five adsorption–desorption cycles. Graphic abstract
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LANGMUIR
·
2025
·
IF 3.9
Jingbo Sun,Xudong Zheng,Youming Zhu,Lin Guo,Xuan Ma,Xinmiao Pan,Xiang Gu,Jinfeng Mei,Jian Rong,Zhongyu Li
Under the imperative of a circular economy, the efficient recovery of rare earth elements (Lanthanum) from secondary resources is paramount. To overcome the shortcomings of traditional powder adsorbents, such as easy agglomeration and difficult separation, phosphorylated layered double hydroxides (P-LDH) were prepared and immobilized onto the matrix of delignified wood aerogel (WA) to fabricate phosphorylated layered double hydroxide-modified wood aerogel (P-LDH/WA). By intercalating phosphate anions into the interlayer of LDH, specific La(III) chelating sites were assigned to it. The WA substrate retains the renewability of wood and provides a framework with a hierarchical porous structure that can efficiently load P-LDH nanoparticles. Research has shown that the adsorption process of P-LDH/WA follows PSOKM (R2 > 0.992), confirming the dominant role of chemical adsorption. When pH = 7.0, P-LDH/WA exhibits excellent La(III) adsorption performance, which is more in line with the Langmuir model (R2 > 0.991). The maximum adsorption capacity reaches 58.26 mg g–1, significantly better than WA (22.10 mg g–1), And maintain an adsorption efficiency of 81.3% after 3 regeneration cycles, with reusability. Thermodynamic analysis shows that the adsorption process is spontaneous (ΔG° < 0) and endothermic (for P-LDH/WA, ΔH° = 3.77 kJ/mol), indicating that the adsorption capacity increases with increasing temperature. P-LDH/WA combines high capacity, easy separation, and reusability to efficiently recover lanthanum(III) from secondary resources.
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APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Songhai Zheng,Jiajia Fan,Xiancai Lu
Eutrophication has long been a serious environmental problem in global water bodies, and phosphate has been considered as one of the key factors causing water eutrophication. Aiming to develop a low-cost and eco-friendly absorbent for phosphate removal , a type of heated kaolinite‑lanthanum hydroxide complex (HKL-LaOH) was prepared via an in-situ synthesis method . In the complex, a large number of nanoscale lanthanum hydroxide flakes were observed on the heated kaolinite surface. The HKL-LaOH with a relatively low lanthanum oxide content (4.42 wt%) exhibited a high phosphate adsorption capacity of 26.15 mg g −1 . Such a high utilization rate of lanthanum in HKL-LaOH was attributed to the unique two-dimensional flake shape of heated kaolinite, which achieved the effective dispersion of La(OH) 3 on the complex. Furthermore, a great quantity of LaPO 4 nanoparticles on the heated kaolinite surface of the HKL-LaOH complex were observed, which indicated chemical adsorption of phosphate followed by precipitation of LaPO 4 . In summary, the high dispersion of La(OH) 3 in HKL-LaOH and the resulted formation of LaPO 4 nanoparticles leads to high phosphate removal from eutrophic water bodies, which shows excellent application potential in the treatment of eutrophic water.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yi Zhang,Donghao Liu,Weidong Guo,Yigang Ding
Two novel N -rich covalent organic frameworks (COFs), named COF-TZ-TP and COF-TA-TP, were prepared via a one-step solvothermal method and employed as the adsorbent to remove rare earth (RE) ions from solution. The as-prepared materials were characterized with XRD, FESEM, ATR-IR, BET, TGA and XPS analysis. The results show the rapid adsorption kinetics of La(III) with capacities of 165.6 and 89.8 mg/g for COF-TZ-TP and COF-TA-TP after 3 h. Moreover, Langmuir isotherm model and pseudo-second-order kinetic model are well fitted to describe the La(III) adsorption process. The analysis of the adsorption thermodynamic shows that the adsorption process is a spontaneous exothermic process with ΔS 0 of 57.22 and 84.09 J/(mol ∙ K) for COF-TZ-TP and COF-TA-TP, respectively. In addition, the fabricated COFs exhibit the better adsorption results towards the light RE ions compared with heavy ones and the excellent reusability after five adsorption-regeneration cycles. The adsorption mechanism reveals that the splendid adsorption performance of RE for our N -rich COFs is mainly attributed to the surface coordination interaction between the N element and La(III) according to the characterization analysis for COF-TZ-TP before and after the adsorption process with elemental mapping, EDS and XPS. Therefore, these COFs with abundant active N sites offer the highly efficient adsorption capacity of La(III), and provide the promising strategy for the recovery of light RE from waste rare earth devices.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 126
·期 3
·980-986
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IF 1.289
Xiaonan Zhu,Yihu Song,Qiang Zheng
A type of lanthanide (La(III))-containing ionomer based on acrylate processing aid (ACR) for poly (vinyl chloride) (PVC) was synthesized, and influence of the ionomer on thermal stabilization of PVC was investigated with visual color comparison and Congo red methods. Results revealed that the ionomer with a suitable La(III) content behaved as a good costabilizer to PVC. It was able to extend static stabilization time of PVC and postpone “zinc burning.” The stabilizing efficiency of the ionomer to PVC depended on ion content, which was discussed in terms of Eisenberg–Hird–Moore model. Moreover, Fourier transform infrared test verified that this ionomer can react with zinc stearate (ZnSt 2 ) to form some new structures, which is responsible for postponing “zinc burning.” The ionomer and epoxidized soybean oil exhibited a synergistic effect on the stabilizing efficiency of calcium stearate (CaSt 2 )/ZnSt 2 stabilizer to PVC compounds. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 7
·1375-1381
·
IF 3.286
Sun Chongmei,Shen Jin,Cui Rongwei,Yuan Fangzheng,Zhang Hui,Wu Xia
A sensitive fluorescent analytical method for the detection of dopamine (DA) was developed based on surface-enhanced Tb(III)/La(III) co-luminescence using silver nanoflowers (AgNFs). Anisotropic AgNFs show strong surface-enhanced fluorescence effect owing to the abundant sharp tips. Tb(III)/La(III)-DA complexes mainly bind to the sharp tips of AgNFs and thus shorten the distance between the complexes. The shortened distance gives rise to obvious surface-enhanced Tb(III)/La(III) co-luminescence effect. In this work, AgNFs offer many superior properties, such as enhanced intrinsic green fluorescence of Tb(III) ( λ ex / λ em = 310/546 nm), increased fluorescence lifetime, and improved energy transfer efficiency. Under the optimum conditions, the fluorescence intensity is linearly correlated with the concentration of DA in the range of 0.80–10 nM ( R 2 = 0.9970), and the detection limit is 0.34 nM ( S/N = 3). The fluorescent nanoprobe was successfully applied to the determination of DA in human serum samples with recoveries ranging from 99.1 to 102.6%.
Graphical abstract
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Polymers
·
2025
·Vol. 17
·期 10
·1341
·
IF 4.9
Min Zhou,Zhenglin Liu,Dandan Lu,Jiajun Wang,Zili Chen,Yunren Qiu
Due to the similar physicochemical properties of rare earth ions, their separation presents significant challenges. In this study, acidic phosphonic chitosan (aPCS) was prepared by modifying chitosan with phosphite and formaldehyde for improving the water solubility and complexing ability of rare earth ions in acidic aqueous solutions. DFT calculations revealed that its phosphonic groups serve as preferred reaction sites, forming stable bidentate complexes with rare earth cations. The complexation abilities of aPCS and phosphorylated chitosan (PCS) for La(III) were compared at various pHs by complexation–ultrafiltration. The results showed that aPCS achieved a 97% rejection for La(III), while 70% for PCS at pH 5 and P/RE 10. Furthermore, aPCS maintained higher rejection than PCS at pH of 3 to 7. In conclusion, aPCS demonstrates excellent potential for the selective extraction and purification of rare earth ions.
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Journal of Water Process Engineering
·
2026
·
IF 6.6
Zengjin Fu,Yan Hao,Tingrui Lin,Huiling Ma,Huazheng Sai,Hui Yang
A novel adsorbent (PHPM) was synthesized through the functionalization of N -(2-Hydroxyethyl) acrylamide (HEAA) with phytic acid (PA) and applied for the adsorption of La(III) and Ce(III) ions. The material was characterized by means of FTIR, TGA, SEM, and XPS. The present study systematically investigated the effects of contact time, adsorbent dosage, initial La(III) or Ce(III) concentration, and pH value on the adsorption capacity. The maximum theoretical adsorption capacities of PHPM for La(III) and Ce(III) were determined to be 198.0 and 186.2 mg·g −1 , respectively. The adsorption process followed the pseudo-second-order kinetic model and the Langmuir isotherm model, as further confirmed by nonlinear fitting with low RMSE and χ 2 values. Thermodynamic analysis revealed negative Δ G values, positive Δ H and Δ S values, indicating a spontaneous, endothermic, and entropy-driven process. Furthermore, PHPM demonstrated high adsorption efficiency toward La(III) and Ce(III), even in the presence of competing ions. A preliminary cost analysis indicated that the preparation of PHPM was economically feasible with low cost. The adsorbent maintained approximately 50% of its initial adsorption capacity after ten consecutive adsorption-desorption cycles. The findings demonstrate that PHPM was a promising adsorbent for the recovery of La(III) and Ce(III) from aqueous environments.
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Journal of Saudi Chemical Society
·
2022
·
IF 4.712
Tao Chen,Ning Sun,Yuan Zhao,Jie Gao,Guowen Hu,Xiaobing Han,Yayang Tian,Linfeng Chen,Guobao Huang,Bing Li
A new aminophosphonic acid chelating resin was successfully prepared via electron beam irradiation grafting combined with chemical modification and used for the efficient removal of La(III). Firstly, glycidyl methacrylate (GMA) was grafted to polystyrene microspheres (PS) via electron beam co-radiation to obtain PS-PGMA microspheres, then followed by the amination with diethylenetriamine (DETA) to formed PS-PGMA-DETA (PGD) microspheres through nucleophilic substitution between amino and epoxy group, and finally PS-PGMA-DETA-PA (PGDP) microspheres was obtained by phosphorylation with phosphorous acid (PA). The obtained chelating resin absorbent was characterized by Fourier-transform infrared (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), which demonstrated that the millimetric aminophosphonic acid chelating resin were successfully prepared with well-defined morphology and enhanced thermal stability. The X-ray photoelectron spectroscopy (XPS) characterization results confirmed a possible adsorption mechanism, which is mainly based on the chelation and coordination of N and O in PDGP with La(III) in the solution. A series of parameters were taken into account in the adsorption experiment, such as absorbed dose, GMA concentration, dosage of PGDP, pH, contact time, temperature, and the initial concentrations of La(III). The maximum adsorption capacity obtained from the research can be achieved 288.69 mg/g at 298.15 K, pH = 6. The kinetic sorption for for La(III) fitted the type 1 pseudo-second-order (R 2 = 0.9981), which revealed that the La(III) are chemisorbed on the surface of the PGDP. It was concluded that the La(III) adsorption conformed to the Freundlich equation, indicating a multilayer adsorption process. Thermodynamic data indicated that the La(III) uptake process was a spontaneous and endothermic. In addition, this research provided a new irradiation grafting method for rare earth ions removal.
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