INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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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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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2026
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IF 1.7
Wang Jialei,Wang Rui,Wang Jingsong
Hollow mesoporous silica microspheres (HMSS) represent a novel class of inorganic silica materials characterized by a unique hollow structure, high specific surface area, and well-ordered pore structure. These features have demonstrated significant potential for the efficient adsorption and separation of radioactive nuclides. In this study, molecular dynamics simulations were first employed to systematically investigate the adsorption and diffusion behaviors of UO 2 2 ⁺, NO 3 − , and H 2 O in HMSS with different pore sizes. The simulation results were analyzed using density distribution, radial distribution function (RDF), mean square displacement (MSD), and diffusion coefficient. Guided by the pore size effects revealed through simulations, HMSS with tailored pore structures were rationally designed and synthesized. Comparative adsorption experiments were conducted with typical mesoporous materials MCM-41 and SBA-15 to systematically evaluate the influence of pore size on U(VI) adsorption performance. This study comprehensively utilized experimental characterization techniques such as XRD, FT-IR, XPS and SEM, and combined with the thermodynamic and kinetic information obtained from molecular dynamics simulations to deeply reveal the adsorption and diffusion mechanisms of U(VI) in mesoporous silicon materials with different pore sizes at the atomic scale. This work provides a solid theoretical foundation and experimental support for the rational design of high-performance adsorbents for nuclear waste treatment applications.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Liping Liang,Fenfen Xi,Jinhui Zhao,Gunel Imanova,Sridhar Komarneni,Jianfeng Ma
nZVI was immobilized on MIL-101(Cr), a metal–organic framework (MOF), and subsequently utilized for the removal of U(VI) from aqueous solution. This composite was also tested for its toxicity to Escherichia coli ( E. coli ). The results demonstrated that MIL-101(Cr) and nZVI had a significant synergistic effect. This composite material is excellent for removing U(VI) and the optimal ratio of MIL-101(Cr) to nZVI was found to be 1.2:1 on mass basis. Adsorption data exhibited excellent fitting to the Freundlich and pseudo-second-order kinetic models, and a maximum removal capacity of 526.32 mg/g of U(VI) was achieved by M-Fe at 298 K (pH = 6.0). The removal mechanisms were clarified by the X-ray absorption near edge structure (XANES), X-ray photoelectron spectroscopy (XPS), and extended X-ray absorption fine structure (EXAFS). Results reveled that U(VI) was mainly removed through chemisorption, forming a bidentate mononuclear edge-sharing linkage between UO 3 pyramid and iron(hydro)oxide. Through free radical quenching experiments and EPR analysis, it was indicated that the existence of reactive oxygen species (ROS) accelerates the oxidation of nZVI, generating more iron oxides or hydroxides for U(VI) adsorption, while inhibiting the reduction of U(VI) to U(IV). Furthermore, immobilized nZVI on MIL-101(Cr) mitigated the biotoxicity of Escherichia coli ( E. coli ). Direct contact played a crucial role in inactivating E. coli cells by nZVI/ E. coli system. Extracellular reactive oxygen species (ROS) played a vital role in inactivating E. coli in the M-Fe/ E. coli system where OH is the main ROS. These findings enhance our understanding of the mechanism of U(VI) removal and bactericidal effect on organisms using ZVI-based composites, which will broaden the application scope of the two materials in pollution removal, especially in radioactive decontamination.
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2025
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IF 1.6
Huang Xuanhao,Liu Xingyue,Wang Yiting,Wang Zhuang,Yu Qiao,Zhou Hang,Li Rui,Ding Songdong
As one of the main radiolysis products of tri-isoamyl phosphate (TiAP) in the spent fuel reprocessing process, di-isoamyl phosphate (DiAP) can lead to a significant deterioration of TiAP in extraction performance. In this context, the effect of DiAP on the extraction and stripping behaviors of U(VI), Th(IV), and Zr(IV) for 1.1 mol/L TiAP/ n -dodecane organic phase was investigated for the first time. It has been shown that DiAP can increase the ability of TiAP to extract metal ions and inhibit the stripping, as well as promote the formation of interfacial deposition. Combined with the results of DLS, FT-IR, 31 P NMR, ESI-MS and elemental analysis, the role of DiAP in the formation of interfacial deposition was also elucidated.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Dingzhong Yuan,Shiao Zhang,Jiale Tan,Yahong Dai,Yun Wang,Yan He,Yan Liu,Xiaohong Zhao,Mengmeng Zhang,Qinghua Zhang
It is challenging to extract Th (IV) and U (VI) from rare earth elements (REEs) in concentrated acidic solution. Herein, a nanoporous polymer adsorbent P (DVB-VPA) bearing phosphonic acid groups has been synthesized by solvothermal copolymerization of divinylbenzene (DVB) and vinylphosphonic acid (VPA). The maximum adsorption capacity (q max ) for Th (IV) and U (VI) onto P (DVB-VPA) was estimated to be 354.6 and 216.5 mg g −1 at 298 K in 4 mol L −1 of hydrogen nitrate media, which were much larger than most of the adsorbents reported previously. Besides, P (DVB-VPA) exhibited a good selectivity for Th (IV) and U (VI) from REEs in concentrated nitric acid solution, since the values of the selectivity for Th (IV) and U (VI) over La (III), Ce (III), Eu (III), Nd (III) and Sm (III) were 82.2% and 72.5%, respectively. XPS analysis revealed that the adsorption mechanism was achieved through the complexation of P O ligands anchored onto the polymer skeleton of P (DVB-VPA) with thorium and uranium. Due to P (DVB-VPA) showed a larger binding force toward Th (IV) than U (VI), both q max and selectivity for Th (IV) in concentrated hydrogen nitrate media was larger than those for U (VI) on P (DVB-VPA), which has been confirmed by DFT calculations.
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高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Xinyu Zhang,Kui Du,Liping Deng,Ziyou Zhang,Zhiqiang Chen,Hongliang Dong
In this paper, we reported an innovative one-pot fabrication approach of a bifunctional nanohybrid through scaffolding of nanoscale zero-valent iron onto the inter-layer structure of graphitic carbon nitride in sequestering U(VI) and Cr(VI) in wastewater. The microstructures, morphologies and chemical compositions of the as–fabricated g-C 3 N 4 /NZVI nanohybrid before and after U(VI)/Cr(VI) sequestration were exploited in detail by applying various physicochemical and spectroscopic methods. Batch experimental results demonstrated that sequestration of targeted U(VI)/Cr(VI) by g-C 3 N 4 /NZVI was higher than those of pure NZVI or g-C 3 N 4 due to the pronounced boost performance, which was ascribed from the introduction of g-C 3 N 4 as matrix inhibited the oxidation of NZVI and improved its reactivity. The pH effect was also elucidated and it was found that lower pH facilitated the sequestration of the negatively–charged Cr(VI), while higher pH benefited the sequestration of the positively–charged U(VI). Moreover, the characterization insights into intrinsic mechanism manifested that sequestration of U(VI)/Cr(VI) was fulfilled through a synergistic effect of adsorption, reduction and coprecipitation. This work is of great significance for understanding the combined sequestration mechanism of U(VI) and Cr(VI), and usage of g-C 3 N 4 /NZVI in sequestration of severe dangerous metal ions, especially efficient detoxification of toxic cations and anions in wastewater.
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产品关联
DOI
高影响因子
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