JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Jisheng Kou,Xiangyue Wei,Hui Wu,Wensheng Linghu,Guodong Sheng,Yixin Pan
The removal of U(VI) and Se(IV) in an aqueous solution was investigated by batch experiments and characterized by spectroscopy techniques such as FTIR, XRD, SEM, TEM, XPS, using FeS@h-BN nanocomposite which was synthesized by hexagonal BN (h-BN) as the stabilizer anchored onto FeS nanoparticles to address the agglomeration of the FeS. The effects of pH, adsorbent concentration, contact time, and initial concentration of U(VI) and Se(IV) on FeS@h-BN adsorption U(VI) and Se(IV) were studied. Results showed that FeS@h-BN nanocomposite showed an excellent decontamination performance due to the large surface area and surface potential. A pseudo-second-order kinetic model well reflected the kinetic adsorption of U(VI) and Se(IV) which indicated chemical interaction mainly contributed to U(VI) and Se(IV) adsorption on FeS@h-BN. The adsorption process of removing U(VI) fitted Freundlich and D-R models well which presented multilayer adsorption on the nanocomposite surface. The Langmuir model fitted well with sorption isotherm data of Se(IV) removal displaying a single monolayer reaction between Se(IV) and FeS@h-BN. The adsorption of U(VI) and Se(IV) was high pH-dependent since pH affected the FeS@h-BN nanocomposite surface potential and U(VI) and Se(IV) speciation. The maximum sorption capacity of U(VI) and Se(IV) reached 163.11 and 196.39 mg/g, respectively. These results reveal that FeS@h-BN nanocomposite could be promising for the effective decontamination of U(VI) and Se(IV).
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Jiangnan Huang,Shuang Chen,Yingjie Ruan,Hao-Fan Wang,Hongjuan Wang,Hao Yu,Yonghai Cao
The efficient uptake of U(VI) ions from the real seawater as the nuclear energy source was of paramount importance. Here, the three-dimensional (3D) flexible carbon felts (FCFs) with N dopants and oxygen-containing groups (o-NFCF) were prepared via the solvothermal method. The obtained FCFs were used as the adsorbents for the uptake and enrich of U(VI) by a flow-through electro-sorption operation in the laboratory-designed device. The pristine FCF (pFCF) displayed a 5.0 mg/g capacity under the initial conditions of 10 mg/L U(VI), which was improved with the presence of an electric field (7.2 mg/g, 0.6 V). The o-NFCFs with 2.58 at.% N dopant and 11.09 at.% oxygen functionalities on the surface would lead to the enhanced performance (11.8 mg/g). This was facilitated by the aid of an electric field (18.8 mg/g, 0.6 V) with a Q max of 44.6 mg/g as well. The decreased activity was observed in the simulated seawater (16.4 mg/g) and real seawater (10.6 mg/g), respectively, probably ascribed to the coexistence of organisms and complex ions. The uptake stability of U(VI) from the real seawater was then observed, ascribed to the desorption capability of U(VI) from the surface of o-NFCF. In this process, o-NFCF could be in-situ regenerated simultaneously. By doing so, the enrichment of U(VI) to 5.85 mg/L concentration from a real seawater was obtained. Mechanistic studies and DFT simulations indicated that the electrochemical properties of 3D-NFCF materials dominated the electro adsorption of U(VI).
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
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IF 9.1
Tingying Zhou,Hongqiang Wang,Shunqing Feng,Eming Hu,Yonggen Deng,Yucheng Su,Jiaang Tian,Qingliang Wang
Phosphate precursor chemistry regulates FeAl-LDH structure and U(VI) capture. • H2PO4−-derived FeAl-LDH balances site accessibility and reversibility. • U(VI) removal is dominated by inner-sphere coordination with O-donor sites. • Electrostatic enrichment and open galleries provide auxiliary enhancement. • Precursor regulation offers an alternative to conventional post-modification. Understanding how phosphate precursor chemistry regulates the structure and U(VI) capture performance of layered double hydroxides (LDHs) remains challenging, as most studies focus on phosphorus loading rather than precursor-dependent phosphate chemistry. In this work, FeAl-LDH materials were synthesized using H 2 PO 4 − , HPO 4 2− , and PO 4 3− as phosphate precursors under identical conditions to investigate their effects on interlayer structure and U(VI) adsorption. Among the three precursor systems, the H 2 PO 4 − -derived material showed the most favorable balance of pore accessibility, phosphorus‑oxygen site availability, and adsorption-desorption reversibility. ICP-OES results further showed that higher phosphorus incorporation did not correspond to higher U(VI) uptake, indicating that adsorption performance depends more strongly on the chemical environment and accessibility of phosphate-derived sites than on phosphorus loading alone. The optimized FeAl-LDH-P(0.3) exhibited a Langmuir-fitted theoretical maximum adsorption capacity ( q ₘ) of 1117.21 mg/g and achieved 98% U(VI) removal from uranium-tailings pore water and leachate. Mechanistic analyses indicate that U(VI) removal is dominated by inner-sphere complexation with Fe/Al-OH and phosphorus‑oxygen sites, while electrostatic pre-enrichment and enhanced mass transfer through accessible interlayer/pore channels act as auxiliary effects. These results demonstrate that phosphate precursor chemistry can regulate the final phosphate-containing environment and structure-performance relationship of FeAl-LDH for selective uranium capture. Download: Download high-res image (339KB) Download: Download full-size image
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DESALINATION
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2026
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IF 9.9
Linkai He,Xingqiang Wu,Yun Tian,Yixin Pan,Faquan Wu
The release and dispersion of uranium during mining activities and fuel/waste management processes in nuclear power plants pose serious environmental risks, particularly in aqueous systems. In such environments, uranium exhibits high solubility and strong mobility, leading to severe radioactive contamination of groundwater, soil, and ecosystems. Therefore, remediating uranium-contaminated environments remains a significant scientific and technological challenge. To address this issue, the present study exploits the high specific surface area and tunable pore architectures/functional sites of metal-organic frameworks (MOFs). Using a controlled synthesis strategy, a core-shell (Fe-Ni) galvanic cell structure was constructed and integrated with MIL-100(Fe) to fabricate the Ni-Fe-MIL-100(Fe) composite, enabling highly efficient and synergistic removal of U(VI) via an “adsorption-reduction-complexation” mechanism. Experimental results demonstrate that the maximum uranium uptake capacity reached 3038.19 mg·g −1 at 303 K and pH = 5, with a significantly enhanced removal efficiency. The kinetic analysis indicates that the uranium adsorption process is well described by the pseudo-second-order model. Combined with density functional theory (DFT) calculations, the electronic transfer channels of the structure were elucidated, revealing that they drive the reduction of U(VI) and facilitate its coordination and immobilization at multi-metal and oxygen-containing sites. These findings confirm that U(VI) removal by the composite material proceeds via a coupled chemical reduction and complexation process, thereby clarifying the underlying adsorption mechanism. Moreover, in mixed-ion solutions and real seawater, the composite maintains high adsorption capacity and excellent selectivity, demonstrating strong potential for uranium immobilization and recovery in the remediation of radioactive wastewater.
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DESALINATION
·
2026
·
IF 9.9
Lihong Lu,Fang Yang,Xingyu Zhong,Hongfa Shi,Junran Zhang,Xin Liu,Wenqing Zhang,Lingfan Zhang
In the present work, a novel Congo red/Chitosan@Melamine Sponge composite (CRCS@MS) was successfully fabricated via a facile crosslinking strategy, adhering to the “waste control by waste” concept, for the efficient elimination of U(VI) from aqueous systems. Systematic physicochemical analyses confirmed the successful grafting of amino and sulfonic acid groups within the preserved three-dimensional porous skeleton of the material. Batch adsorption tests demonstrated that U(VI) adsorption onto CRCS@MS complied with the Sips model, indicating a monolayer-dominated adsorption process. A removal efficiency of 98.58% was achieved under optimized conditions. The composite maintained over 90% removal after four consecutive cycles, which indicated that it exhibited a certain degree of reusability, and it exhibits stable adsorption performance in real seawater and river water environments with certain uranium concentrations. Mechanistic studies revealed that the adsorption process was primarily dominated by electrostatic interactions between sulfonic acid groups and U(VI), with amino and hydroxyl groups synergistically enhancing the adsorption through hydrogen bonding or coordination interactions, thereby achieving certain U(VI) uptake. Furthermore, machine learning techniques were employed to model the adsorption behavior, with seven models systematically evaluated including Support Vector Regression (SVR) with various kernels, Random Forest (RF), and Artificial Neural Network (ANN). Results demonstrated that the RF model outperformed others, achieving a test set R 2 of 0.9422 with the lowest prediction errors, validating the effectiveness of machine learning in effectively capturing the intricate relationships within adsorption processes. This work provides methodological support for the development of sustainable and efficient adsorbents for radionuclide remediation.
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DESALINATION
·
2026
·
IF 9.9
Lihong Lu,Fang Yang,Xingyu Zhong,Hongfa Shi,Junran Zhang,Xin Liu,Wenqing Zhang,Lingfan Zhang
Organic azo dyes were employed for the first time to modify chitosan-based composite materials for uranium removal. • Pearson analysis identified initial U(VI) concentration and adsorbate volume as key features. • Good reusability (>90% after 4 cycles) and stable performance in real water matrices. • Mechanism: sulfonic acid groups coordinated with U(VI), synergistically enhanced by amino and hydroxyl groups. • Random Forest model accurately predicted adsorption capacity (R 2 = 0.9422). In the present work, a novel Congo red/Chitosan@Melamine Sponge composite (CRCS@MS) was successfully fabricated via a facile crosslinking strategy, adhering to the “waste control by waste” concept, for the efficient elimination of U(VI) from aqueous systems. Systematic physicochemical analyses confirmed the successful grafting of amino and sulfonic acid groups within the preserved three-dimensional porous skeleton of the material. Batch adsorption tests demonstrated that U(VI) adsorption onto CRCS@MS complied with the Sips model, indicating a monolayer-dominated adsorption process. A removal efficiency of 98.58% was achieved under optimized conditions. The composite maintained over 90% removal after four consecutive cycles, demonstrating good reusability, and exhibited stable adsorption performance in real seawater and river water matrices. Mechanistic studies revealed that the adsorption process was primarily dominated by electrostatic interactions between sulfonic acid groups and U(VI), with amino and hydroxyl groups synergistically enhancing the adsorption through hydrogen bonding or coordination interactions, thereby achieving efficient U(VI) uptake. Furthermore, machine learning techniques were employed to model the adsorption behavior, with seven models systematically evaluated including Support Vector Regression (SVR) with various kernels, Random Forest (RF), and Artificial Neural Network (ANN). Results demonstrated that the RF model outperformed others, achieving a test set R 2 of 0.9422 with the lowest prediction errors, validating the effectiveness of machine learning in effectively capturing the intricate relationships within adsorption processes. This work provides methodological support for the development of sustainable and efficient adsorbents for radionuclide remediation. Download: Download high-res image (144KB) Download: Download full-size image
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SOLVENT EXTRACTION AND ION EXCHANGE
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2021
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IF 2.513
Yifu Hu,Chuan Lu,Qi Chen,Yaoyang Liu,Yu Zhou,Caishan Jiao,Meng Zhang,Hongguo Hou,Yang Gao,Guoxin Tian
In this paper, pertraction of Nd(III) and U(VI) from nitric acid media through a flat-sheet supported liquid membrane (FSSLM) was studied by using a self-made liquid membrane device, respectively, with N, N’-dimethyl-N, N’-dioctyl-3-oxadiglcolamide (DMDODGA) diluted in 40/60 (V/V)% n-octanol/kerosene as the carrier. The effects of various factors, such as the acidity of the feed and stripping phases, neodymium concentration, uranium concentration, DMDODGA concentration are discussed. The optimized conditions for Nd(III) transport were found to be 3 M HNO3 in the feed phase, 0.5 M HNO3 in the stripping phase, 0.48 M DMDODGA in n-octanol/kerosene as the carrier. When the initial concentration of Nd(III) was 1 × 10−4 mol/L, the transport rate of Nd(III) was 86.4(±2.2)%. Compared with Nd(III), the liquid membrane was less effective in the transport of U(VI), the highest transport rate of U(VI) was 57.2 (±2.6)%.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2020
·Vol. 327
·期 1
·175-188
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IF 1.137
Luo Jiaqi,Xu Yuli,Zhu Qiqi,Zhang Kang,Chen Fang,Yu Xiuwu,Huang Zhao,Xiao Fangzhu,Peng Guowen
A novel adsorbent magnetic functionalized m-carboxyphenyl azo calix[4]arene symmetrical sulfide derivative (Fe 3 O 4 /M-CCSSD) was fabricated by a series of simple reactions and characterized by FT-IR and SEM. The effects on U (VI) adsorption process were investigated at several conditions. The calculated data disclose that the adsorption process of U (VI) by Fe 3 O 4 /M-CCSSD is an endothermic spontaneous process, which well fits with the pseudo-second-order kinetic and Freundlich isotherm model. In the most favorable conditions, accounting for approximately 89% of U (VI) was removed. In addition, Fe 3 O 4 /M-CCSSD showed high selectivity for U (VI) and exceptional reusability.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Geng Chen,Hanqin Weng,Zhihao Wu,Yizhi Chen,Peng Zhang,Guoan Ye,Mingzhang Lin
The efficient separation and recovery of uranium(VI) (U(VI)) from lanthanides is pivotal to reduce the radioactive threat of hydrometallurgical residue solution of lanthanide minerals and benefits the sustainability of U resources. Here, we develop a cationic-surfactant-assisted solvothermal exfoliation method to prepare monolayer boron nitride nanosheets (BNNSs) for the ultrafast and selective separation of U(VI) from lanthanides. With the assistance of the strong “cation–π” interaction between cationic surfactants and BN, the monolayer BNNSs were prepared. Functionalization with diamide phenanthroline (DAPhen) groups endows the pristine BNNSs, which can hardly adsorb U(VI), with outstanding U(VI) adsorption performance. Batch adsorption experiments demonstrate that the obtained DAPhen modified BNNSs (BNNSs-DAPhen) exhibited high maximum adsorption capacity and ultrafast adsorption kinetics. The adsorption process reached equilibrium less than 1 min and the maximum adsorption capacity was estimated to be 313 mg g −1 by fitting with Langmuir model. Even under high concentrations of salts and acids, BNNSs-DAPhen still maintained excellent adsorption performance owing to the strong complexing ability of DAPhen groups with U(VI). The selectivity coefficients of U(VI) toward various lanthanides including lanthanum(III), cerium(III), europium(III), gadolinium(III), ytterbium(III), and lutetium(III) were beyond 120 at a high nitric acid concentration of 5 mol L −1 . This work proposed a universal strategy for the production of monolayer BNNSs and the subsequent functionalization, which might be promising in the treatment of residual solution for lanthanides hydrometallurgy and decontamination of U(VI).
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GREEN CHEMISTRY
·
2019
·Vol. 21
·期 3
·649-657
·
IF 9.405
Xing Li,Yue Qi,Guozong Yue,Qianxun Wu,Yang Li,Meicheng Zhang,Xinghua Guo,Xiaofeng Li,Lijian Ma,Shoujian Li
A green and facile solvent- and catalyst-free method, without inert gas protection and/or mechanical grinding to synthesize an azine-linked covalent organic framework (ACOF) with high efficiency, was proposed for the first time. Characterization techniques and experimentations show that the as-synthesized ACOF has high crystallinity and superior physical and chemical stability and exhibits good adsorption performance for both radioactive heavy metal U(VI) and ordinary heavy metal Hg(II), with adsorption capacities of 169 mg g−1 for U(VI) and 175 mg g−1 for Hg(II), which makes the ACOF a potential adsorbent material for heavy metal removal and uranium recycling. Tautomerization between the enol-form and keto-form was verified in the structure of the ACOF which can be induced by the adsorption of metal ions and also affect the adsorption properties simultaneously. It was found that tautomerization from the enol-form to keto-form was promoted in the adsorption, which can be ascribed to the better coordination ability of CO in the keto-form towards the target metal ion, while the selectivity of the ACOF towards U(VI) increases with the decreasing solution pH and reaches 96.2% when the pH is 1.5, which is due to the tautomerization from the keto-form to enol-form under acidic conditions and the consequent size-matching effect. The study on tautomerization in solid materials is rarely reported and is of great importance for deep understanding of the relationship between material structures and properties. The synthesis strategy proposed in this paper provides references for the convenient, efficient and green synthesis of COFs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Yue Wu,Hong Chen,Zhuo Chen,Qingling Guan,Shirui Zhang,Yuhao Huang,Yang Xiao,Yun Liao,Liangshu Xia,Fang Wang
Photocatalytic extraction of uranium from wastewater presents an attractive route for environmental remediation as well as sustainable nuclear energy, aligning with the carbon peaking and carbon neutrality goals. However, conventional g-C₃N₄-based photocatalytic systems suffer from fast electron-hole recombination. To address the challenge, this work innovatively constructed a photocatalytic material using a strategy of K/S co-doping coupled with cyano functionalization. It demonstrated superior U(VI) photocatalytic extraction efficiency, strong anti-interference capability against coexisting ions and excellent recyclability. An extraction efficiency of 95.7% for U(VI) was attained without any sacrificial agent or protective gas. The results indicated the synergy of K/S doping combined with cyano functionalization tailored the band structure and generated high localized electron density. The large molecular dipole induced a built-in electric field (BEF) promoting oriented photo-excited electron movement and thereby enhancing U(VI) photocatalytic extraction. Ultimately, U(VI) ions were enriched on the photocatalyst via deposition of (UO 2 )O 2 ·2H 2 O, driven synergistically by photogenerated electrons and ·O₂ − . This research presents a novel and effective approach for recovering uranium resources from wastewater through photocatalysis.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Jin-Hua Xue,Hui Zhang,D. X. Ding,Nan Hu,Yong-Dong Wang,Yong-Sheng Wang
Linear β-cyclodextrin polymer functionalized multiwalled carbon nanotubes (MWCNTs-CDP) were synthesized and employed as a novel nanoadsorbent to remove uranyl ions in wastewater solutions. The characterization of MWCNTs-CDP, with Fourier transform infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET), suggested that the CDP was successfully modified on the MWCNTs surfaces. The removal efficiency of uranyl ions in aqueous solution by MWCNTs-CDP was investigated via varying various experimental conditions. We found that the removal of uranyl ions correlated with both pH and temperature, and the optimum pH and temperature were 6.0 and 323.15 K, respectively. The adsorption of uranyl ions was very fleet at the initial 1 h and then reached the adsorption equilibrium after 3 h. The data from the adsorption dynamics experiment could be commendably fitted by the pseudo-second-order model (R2 > 0.982), suggesting that chemisorption might be the rate-controlling mechanism. The Langmuir model (R2 > 0.995) manifested that the maximum adsorption capacity of uranyl ions on MWCNTs-CDP was boosted from 66.16 to 89.54 mg g–1 upon the change of temperature from 293.15 to 323.15 K. This result was better than that of some reported adsorbents. The thermodynamics analysis proved that the adsorption of uranyl ions on MWCNTs-CDP was a spontaneous process and an endothermic one. The adsorption mechanism of uranyl ions on MWCNTs-CDP was verified to be dominated by inner-sphere surface complexation. Our results indicated that MWCNTs-CDP can be utilized as a novel nanoadsorbent for highly effective removal of uranyl ions in actual uranyl-bearing effluents.
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