COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Lirong Yang,Chuanqun Huang,Xuan Luo,Lin Zhang,Yongjie Ye,Hui Jun,Yan Wang
Due to the high swelling ratio, the use of chitosan-based composites for adsorption of U(VI) from wastewater is limited. To overcome this shortcoming, a novel type of hierarchical porous chitosan-based aerogel (CS-PTA-DMAs) with anti-swelling is successfully prepared via cross-linking chitosan with the cross-linker PTA-DMA, which is synthesized by p-phthalaldehyde (PTA) and 3,5-diaminobenzoic acid (DMA). There is no significant volume expansion of the aerogel after soaking in ultrapure water for 1 week, indicating it has good swelling property. In addition, the CS-PTA-DMA aerogel has a high U(VI) adsorption capacity of 160 mg/g (308 K, pH 6). The adsorption behavior of CS-PTA-DMA to U(VI) is coordinate to the pseudo-second-order kinetic model and Freundlich isothermal model, which is spontaneously endothermic. Moreover, the adsorption mechanism is also investigated in details. These findings are crucial for the development of practical application uranium adsorbents.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 7
·2759-2770
·
IF 1.6
Li Xiuxin,Ouyang Jiafeng,Zhang Pengcheng,Wang Degao,Zhang Lei,Yuan Liyong,Liang Tongxiang,Chai Zhifang,Shi Weiqun,Wang Lin
Novel sandwich-like ZnIn 2 S 4 /Ti 3 C 2 composites with strong interfacial coupling were prepared by a facile solvothermal approach for U(VI) photocatalytic reduction immobilization. The integration of Ti 3 C 2 nanosheets into ZnIn 2 S 4 hierarchical structures endowed the composite outstanding photocatalytic performance through improving the utilization of solar energy and boosting the separation of photogenerated electrons and holes, evidenced by a fast reaction rate of 0.0247 min −1 , which was 3.20 times of that for pristine ZnIn 2 S 4 . The corresponding U(VI) removal efficiency of 50 ppm U(VI) solution reached 96.1% under visible light irradiation without sacrificial agents. In addition, the excellent stability and reusability of ZnIn 2 S 4 /Ti 3 C 2 has been demonstrated. Graphical Abstract Sandwich-like 2D/2D ZnIn 2 S 4 /Ti 3 C 2 composite for highly efficient photocatalytic reduction of U(VI)
研究领域:
材料科学
·
环境科学
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Yanxue Yue,Weiyu Zhu,Alhadi Ishag,Bo Zhang,Yubing Sun
The natural clay mineral was activated using the acid treatment under ultrasonic conditions to improve its adsorption performance. The acid-activated clay (AAC) was investigated to remove Cr(VI) from wasted lubricant and U(VI) from aqueous solution by batch, spectroscopy, and modeling. Batch experiments showed that the isotherms and adsorption kinetics of Cr(VI)/U(VI) on AAC were satisfactorily followed by Frenudlich and the pseudo-second-order model, respectively. The decreased adsorption of U(VI) on AAC with the increase of ion strength indicated the outer surface complexation of U(VI) on AAC. The interaction mechanism of Cr(VI)/U(VI) on AAC was demonstrated to be surface complexation by oxygenated functional groups (e.g., hydroxyl) according to X-ray photoelectron spectroscopy (XPS) analysis. According to fitting of surface complexation models using three approaches, the adsorption of U(VI) on AAC at different pH can be better fitted by the double-layer model compared to the constant-capacitance model and triple-layer model. These findings are great important for the application of acid activated clay in the removal of heavy metals and radionuclides from the environment.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lei-Tao Sha,Qiang Wu,Yi-Fan Zhang,Wei-Jia Wang,Fei Wu,Qing-Gang Huang,Ze-Yi Yan
The hydrophobic deep eutectic solvents (HDES) with low viscosity, density and environmental friendliness have been prepared and characterized based on trioctylphosphine oxide (TOPO) and N,N -dihexyl succinamic acid (DHSCA), which were used as both extractant and organic phase for highly efficient removal of radioactive elements of U(VI) and Th(IV) from rare earth (RE) leaching solution. The extraction efficiency of U(VI) and Th(IV) exceeded 99 % by a single stage extraction. Benefiting from the blocking effect of hydrogen bonding on P = O and the good affinity of DHSCA and TOPO for actinides, the present HDES exhibited the excellent extraction selectivity for U(VI) and Th(IV) over Fe(III), Al(III), Mg(II), Ca(II) and RE(III). Even after seven extraction-stripping cycles, the prepared HDES could still effectively remove radioactive U(VI) and Th(IV) from RE leaching solution. The co-extracted U(VI) and Th(IV) was further separated and enriched by two successive stripping steps. Using the slope analysis, 31 P NMR and FT-IR spectra, the stoichiometry of extracted species and the extraction mechanism of HDES to Th(IV) and U(VI) were evaluated. Due to the superior extraction efficiency, excellent environmental compatibility and sustainability, the present approach offers a practical alternative for removal of radioactive elements from rare earth minerals.
研究领域:
化学工程
·
环境科学
·
核化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 10
·4179-4190
·
IF 1.6
Wang Yaoxuan,Duan Siyihan,Song Wanrong,Duan Tao,Zhu Lin
The efficient removal of uranium from aqueous solutions is critical for ecological safety. Herein, a novel phytic acid and melamine covalent polymer adsorbent (named PEM) was designed and synthesized through a simple one-pot method, and its adsorption performance and mechanism of U(VI) were systematically investigated. The maximum adsorption capacity on U(VI) achieved 505.05 mg g −1 at pH 4.0, calculated with the Langmuir model, which was much higher than most other adsorbents under the same environment. Importantly, the reaction reached equilibrium quickly in the initial 20 min at 298 K. The sorption process conformed to a pseudo-second-order kinetics model and Langmuir model, indicating that the chemisorption of the monolayer was dominant. Overall, the synthesized PEM could be utilized as an easy, efficient, less time-consuming material for the removal of uranium from acidic nuclear wastewater. Graphical abstract
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2018
·
IF 0
Haijun Chen,Zhibin Zhang,Xiangxue Wang,Jing Chen,Chao Xu,Yunhai Liu,Zhimin Yu,Xiangke Wang
Magnetic Fe/Zn layered double oxide decorated carbon nanotubes (M-Fe/Zn-LDO@CNTs) composites were synthesized via a hydrothermal method with further calcination treatment. The fabricated M-Fe/Zn-LDO@CNTs were characterized by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, UV–vis spectroscopy, scanning electron microscopy, and transmission electron microscopy and then applied for U(VI) elimination under diversiform experimental conditions, such as pH, temperature, ionic strength, contact time, and coexisting ions. The experimental results demonstrated that the U(VI) adsorption performance of M-Fe/Zn-LDO@CNTs was much higher than bare CNTs. The thermodynamic parameters revealed that U(VI) adsorption on M-Fe/Zn-LDO@CNTs was endothermic and spontaneous. More importantly, the adsorption performance of U(VI) on M-Fe/Zn-LDO@CNTs was still higher than ∼89% after five cycles. Furthermore, ∼95.9% of 241Am(III) could be removed by M-Fe/Zn-LDO@CNTs from solution at pH = 8.0, which confirmed that M-Fe/Zn-LDO@CNTs was an excellent material for efficient removal of long-lived lanthanides and actinides from environmental aqueous solutions in radionuclides’ pollution remediation.
研究领域:
材料科学
·
环境科学
·
核化学
·
纳米技术
✓ 已验证
产品关联
DOI
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Xiaoqing Xie,Yanfei Wang,Weini Zhou,Can Chen,Zeng Xiong
A new synthetic method was designed to prepare poly (trimesoyl chloride-co-polyethyleneimine) (PEI-TMC). Characterization of PEI-TMC was investigated by FTIR, SEM, EDS , XPS, TGA , and BET. TGA test revealed that the PEI-TMC had excellent thermal stability. The BET specific surface area (4.74 m 2 g −1 ) and pore diameter of about 9.44 nm indicated that PEI-TMC possessed a mesoporous structure. The adsorption behavior of U(VI) on the PEI-TMC was investigated. The thermodynamic analysis showed that the process of PEI-TMC adsorption of U(VI) was endothermic and spontaneous, and the adsorption efficiency was better at higher temperatures. The U(VI) sorption on PEI-TMC was conformed to the Langmuir adsorption isotherm and pseudo-second-order kinetic models . The adsorption mechanism of U(VI) with PEI-TMC was systematically elucidated by XPS and FTIR. Under the best condition, the maximum adsorption capacity of PEI-TMC could reach 212.8 mg g −1 by calculating the Langmuir isothermal model. It indicated that PEI-TMC was a potential adsorbent for the treatment of U(VI)-containing wastewater.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED RADIATION AND ISOTOPES
·
2022
·
IF 1.787
Yunyun Bao,Yan Liu,Changfu Wang,Yun Wang,Dingzhong Yuan,Jianda Xu,Zuqing Zhu,Yan He,Jinbiao Liu
The adsorption and recovery of uranium from wastewater is of positive significance to the development of nuclear industry and environmental remediation. The ternary polymer (PZS-co-TA) was prepared from hexachlorocyclotriphosphazene (HCCP), 4,4-sulfonyldiphenol (BPS) and tannic acid (TA) under ultrasonic . TAC was then obtained after carbonization under high temperature from PZS-co-TA. The structure and performance of TAC were analyzed using SEM , EDS, FT-IR, XRD, Raman, BET and TG. The adsorption capacity of TAC for uranium under different static adsorption conditions was investigated. The adsorption process was more consistent with pseudo-second-order model. The maximum adsorption capacity calculated by non-linear Langmuir model was 492.5 mg/g at pH 5.5. The thermodynamic values suggested that the adsorption process was spontaneous and endothermic. Moreover, after five cycles of adsorption-desorption tests, TAC remained effective at adsorbing uranium, implying the introducing of TA to the precursor (PZS-co-TA) could enhance the adsorption capacity for uranium.
研究领域:
环境科学
·
材料科学
·
核工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 2
·889-902
·
IF 1.754
Fu Xibiao,Liu Jun,Ren Zheng,Zhang Siqin,Xiao Fangzhu,Peng Guowen
Metal-organic frameworks (MOFs) MIL-101(Cr)-PMIDA with phosphate groups were prepared for the adsorption of U(VI). The morphology and structure of the samples were characterized by SEM, TEM, FT-IR, BET, XPS and XRD. This study investigated the effects of the initial U(VI) concentration, contact time, pH, adsorption temperature and coexisting ions on the adsorption of U(VI) by MIL-101(Cr)-PMIDA. The experimental results showed that the adsorption capacity of MIL-101(Cr)-PMIDA was 267.92 mg g −1 at C 0 (U) = 40 mg L −1 , pH = 6.0 and T = 298 K, which was much higher than that of MIL-101(Cr)-NH 2 (71.10 mg g −1 ). More importantly, the material exhibited excellent selective removal performance for U(VI) in an aqueous solution. Furthermore, adsorption thermodynamics and kinetic studies showed that the adsorption was spontaneous (∆G < 0) and exothermic (∆H ˃ 0), following the pseudo-second-order kinetic model (R 2 > 0.99). Graphical abstract
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 5
·2055-2068
·
IF 1.754
Liu Wenbin,Huang Yiwei,Huang Guolin,Fan Lijiao,Xie Yuming,Shi Jeffery
Eco-friendly and low-cost composite, amidoxime-functionalized microcrystalline cellulose/mesoporous silica (MCC/MS-AO), were synthesized by co-condensation method. The obtained materials were characterized by scanning electron microscope (SEM), energy dispersive spectrometer (EDS), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and N 2 adsorption–desorption analysis. Batch experiments were carried out to study the adsorption capacity of U(VI) on MCC/MS-AO. The results show that the material has good adsorption capabilities for U(VI) including high capacity, good selectivity, and reusability. The adsorption process conforms to pseudo-second-order kinetic model and Langmuir model, and it is spontaneous and endothermic. Finally, the possible adsorption mechanism was further studied by X-ray photoelectron spectroscopy (XPS) techniques. Graphical abstract
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN NUCLEAR ENERGY
·
2023
·
IF 2.7
Ning Liu,Rumin Li,Dalei Song,Qi Liu,Jiahui Zhu,Jing Yu,Ying Li,Hongsen Zhang,Jun Wang
The extraction of uranium (VI) from uranium solutions is an attractive means in the context of increasing demand for uranium resources. Multiple photocatalysis can convert uranyl ions to UO2 precipitation by adjusting the valence of uranium species, which makes it one of the effective means of uranium extraction. In this paper, LDHS@TCN composites were prepared by in-situ growth method, and the II-scheme heterojunction photocatalyst was successfully constructed. The LDHS@TCN composites has photo-assisted uranium reduction ability, and the photo-assisted uranium extraction reaches 1719.12 mg g −1 . In addition, XPS and DFT calculations were used to verify the formation mechanism of II-scheme heterojunction and the photoelectron transfer pathway during the reduction of U(VI) to U(IV).
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Yawen Cai,Yifeng Zhang,Zhimin Lv,Shuo Zhang,Feixue Gao,Ming Fang,Mingguang Kong,Peisheng Liu,Xiaoli Tan,Baowei Hu,Xiangke Wang
In this work, a highly efficient uranium extraction method from water by the piezo catalytic reduction-oxidation process is reported by utilizing a hollow cubic shaped Zn 2 SnO 4 /SnO 2 as piezo catalyst. The electrons and holes in Zn 2 SnO 4 /SnO 2 are separated efficiently under the irradiation of ultrasound. After that, some of the piezo electrons reduce the adsorbed U(VI) to UO 2 , the others react with soluble oxygen to form H 2 O 2 , and oxidize UO 2 to generate (UO 2 )O 2 ∙2H 2 O, which could be efficiently separated from the solution. U(VI) piezo catalytic extraction rate could reach ~ 90% under the irradiation of ultrasonic waves (40 kHz, 120 W) within 5 h and only decreased by ~ 3% after four cycles. The present work advances piezo catalysis as a new route for uranium extraction from water, which may be applied in the extraction or removal of U(VI) in the U-containing wastewaters, providing new opportunities for resource-saving and environmental enhancement.
研究领域:
环境科学
·
材料科学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）