JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2021
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IF 6.789
Xin Zhao,Meng Li,Fuqiang Zhai,Yanling Hou,Rui Hu
Phosphate species can complex with nuclides and heavy metals from aqueous solutions strongly. The introduction of phosphate groups onto the surface of biochar sorbents (mostly <1.0 at.% of P) is highly desired. In this study, phosphate modified hydrochars (HTBs) were prepared through the hydrothermal carbonization of bamboo sawdust with various duration (2, 12, 24 h) in the presence of phytic acid (0–70 wt%). The results showed that the addition of PA with a low concentration of 10 wt% carbonized at 2 h generated hydrogen protons to etch the pristine sawdust, inducing the granulation of surfaces and a 5.5-fold enhancement of surface area. While HTBs carbonized with increasing PA concentrations (30–70 wt%) and longer duration (12 and 24 h) presented more carbonaceous particles with rising sizes from <100 nm to 2.5 μm, which should be due to the cross-linkage of dehydrated phosphate-containing organic carbon components to the matrix, enabling the resultful surface modification (maximum of 2.1 wt% of P). The uptake of U(VI), Pb(II) and Cd(II) on HTBs was investigated given various geochemical conditions including contact time, pH, ionic strength , humic acid and temperature. HTBs could capture U(VI), Pb(II) and Cd(II) efficiently from the ideal and simulated wastewaters, and be reused well after six recycles. This work opened a new strategy for the potential of phosphate-hydrochars in the aqueous remediation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Hao Yang,Hanlin Ding,Xiaonuo Zhang,Xuegang Luo,Yu Zhang
In this study, a new surface-modified biobased composite was obtained by modifying the surface of fungal mycelium microspheres (FHMs) with polydopamine (PDA). A. niger mycelium/PDA microspheres (AM/PDA microspheres) were used as a highly efficient adsorbent for the removal of U(VI) ions. This study examined the effects of the initial pH, ionic strength, and electrolyte ions on the U(VI) adsorption capacity of the AM/PDA microspheres. The results confirmed that U(VI) was successfully adsorbed on the AM/PDA microspheres. We compared their adsorption capacity with that of other adsorbents, and the adsorption rate and adsorption capacity of the AM/PDA microspheres were found to be higher than those of the other adsorbents. Equilibrium was achieved after 300 min, and the AM/PDA microspheres had a maximum adsorption capacity of 250.70 mg/g. We aimed not only to investigate the factors that affect the adsorption process but also to provide a new mycelial-based composite adsorbent for U(VI)-contaminated water.
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ACS Applied Nano Materials
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2018
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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.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2017
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IF 3.743
Xiaofeng Yi,Jiarui He,Yingyuan Guo,Zhenhua Han,Meixia Yang,Jiali Jin,Junjie Gu,Minrui Ou,Xiaoping Xu
The aim of this work was to study the removal of Cu (II) and U (VI) ions from aqueous solutions by encapsulating magnetic Fe 3 O 4 nanoparticles into calcium alginate coated chitosan hydrochloride (CCM) hydrogel beads. ATR-FTIR and XRD analysis data indicated that the CCM composites were successfully prepared. SEM images and EDX spectra showed that Cu 2+ and UO 2 2+ ions were adhered onto sorbents . Adsorption properties for removal of both copper and uranium ions under various experimental conditions were investigated. Kinetic data and sorption equilibrium isotherms were also conducted in batch process . The sorption kinetic analysis revealed that sorption of Cu (II) and U (VI) followed the pseudo-second-order model well and exhibited 3-stage intraparticle diffusion model during the whole sorption process. Equilibrium data were best described by Langmuir model, and the CCM composite hydrogel beads showed the estimated maximum adsorption capacity 143.276 mg/g and 392.692 mg/g for Cu (II) and U (VI), respectively. The CCM adsorbent exhibited excellent reusability for five cycles use without significant changes in the adsorption capacity and structural stability. The results demonstrated that CCM can be an effective and promising sorbent for Cu (II) and U (VI) ions in wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yining Bao,Qingru Zeng,Shunyan Ning,Wei Zhao,Longfei Wang,Xinpeng Wang,Yuezhou Wei,Deqian Zeng
Developing effective heterojunction photocatalysts that efficiently separate charge carriers and improve light-harvesting capabilities is crucial in addressing energy and environmental issues. Herein, a unique nanocomposite photocatalyst is constructed by attaching CoMn 2 O 4 nanoparticles onto 2D CdS nanosheets for H 2 production and U(VI) reduction. The optimized 2% CoMn 2 O 4 /CdS nanocomposite showcases the highest photocatalytic H 2 production efficiency, 5.8 times higher than CdS nanosheets . Additionally, the U(VI) reduction rate constant of 2% CoMn 2 O 4 /CdS is 0.0192 min −1 , approximately 1.9 folds over the pristine CdS (0.0101 min −1 ). The exceptional photocatalytic performance toward photocatalytic H 2 evolution and U(VI) reduction reactions directly result from the electronic integration between CoMn 2 O 4 /CdS p-n heterojunction, facilitated by the efficient photoexcited charge separation. Feasible photocatalytic mechanisms are proposed through experimental analyses and theoretical calculations. This study provides a straightforward method for designing effective CdS-based heterostructured photocatalysts, contributing to the advancement of solar-to-H 2 conversion and environmental abetment.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Yadan Guo,Shuaihang Li,Fan Yang,Chenxi Li,Yaoping Guo,Keng Xuan,Guanghui Wang,Yunhai Liu,Jun Li
Photocatalytic reduction of U(VI) in aqueous solutions has been considered as an efficient and promising technology to solve radioactive U pollution. In this work, density functional theory (DFT) calculations were firstly employed to optimize and compare the adsorption configurations combined uranium with four given photocatalysts , then their adsorption energies were − 0.97 eV for AgFeO 2 , − 1.15 eV for Zn doped AgFeO 2 , − 1.73 eV for Cu doped AgFeO 2 and − 2.66 eV for S doped AgFeO 2 , respectively, indicating the sulfur doping plays a major role in U(VI) photoreduction . Herein, a visible light responsive efficient sulfur doped AgFeO 2 photocatalyst (S doped AgFeO 2 ) was synthesized and utilized to photocatalytic reduction of U(VI) in aqueous solutions. According to XRD , XPS and TEM analysis, the sulfur was successfully doped in AgFeO 2 via the hydrothermal method . The batch experimental showed that S doping enhanced the U(VI) photoreduction activity of AgFeO 2 , and the S-AFO-3 photocatalyst exhibited the highest photocatalytic activity (92.57%), which was 1.5 times than that of pure AgFeO 2 . ESR , PL and DFT results demonstrated that the enhancement of adsorbed U(VI) photoreduction was attributed to the own unique effect of oxygen vacancy defects and efficient charge separation of S doped AgFeO 2 photocatalyst. Due to its higher adsorption energies, fast-U(VI) photoreduction rate and superior chemical stability, the sulfur doped AgFeO 2 photocatalyst is hoped for water remediation containing U(VI) wastewater.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2020
·Vol. 324
·期 2
·847-855
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IF 1.137
Yang Shasha,Huang Yiwei,Huang Guolin,Peng Wei,Guo Chenglun,Shi Jeffery
The amidoxime-functionalized biopolymer/graphene oxide gels were prepared and their performance in the application of the adsorption separation of uranium (VI) in aqueous solution has been studied. The prepared gels were characterized by using scanning electron microscopy, energy dispersive spectroscopy, Fourier transformed infrared spectra, and X-ray diffraction to determine the microscopic morphology, chemical composition and crystal structure. The adsorption performance of the gels including the effects of solution pH and contact time on the adsorption capacity has been evaluated by a batch adsorption technology. The adsorption isotherms and kinetics were measured, and the experimental data were analyzed and shown to be agreed with the Langmuir isotherm and the pseudo-second-order kinetic model. The results demonstrated that the adsorption process was the rate-limiting step in the separation process.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Si-Yu Chen,Ji-Pan Yu,Zhi-Fang Chai,Wei-Qun Shi,Li-Yong Yuan
Although organic sacrificial agents are often used to improve the efficiency of photocatalytic reactions, the impact of their existence on the performance evaluation of photocatalysts has not been analyzed yet. In this study, to clearly understand the role of organic sacrificial agents in the photocatalytic process, the photocatalytic reduction of hexavalent uranium (U(VI)) by alcohols is systematically analyzed. The results reveal that under the conditions of pH 5, nitrogen atmosphere, visible light irradiation, and no photocatalyst, the alcohol sacrificial agents can directly reduce U(VI) with efficiencies as high as 98%. Uranium dioxide, formaldehyde, and hydrogen ion are identified as the final products of the photocatalytic reaction, and the reaction mechanism is proposed based on the results of electron paramagnetic resonance (EPR) spectroscopy. Accordingly, it is inferred that alcohol as an organic sacrificial agent markedly interferes with the performance evaluation of photocatalysts during the photocatalytic reduction of U(VI). Overall, this study provides valuable insights into the actual role of sacrificial agents in the photocatalytic reduction process.
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Journal of Water Process Engineering
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2022
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IF 7.34
Meng Cao,Liman Chen,Wenda Xu,Jianzhang Gao,Yunyang Gui,Fuqiu Ma,Peng Liu,Yun Xue,Yongde Yan
High-performance graphene oxide composite nitrogen-doped carbon (GO@NCs) materials were prepared at different temperatures (600, 700 and 800 °C) by a one-step carbonization method. The electrosorption performances of GO@NCs for U(VI) were investigated. The results showed that the specific surface area of GO@NC-700 was 266.3 m 2 ·g −1 . The doped nitrogen mainly existed in the form of pyridine (N-6), pyridine (N-5), and quaternary-N (N-Q). The incorporation of nitrogen atoms and graphene oxide effectively improved the electrochemical performance of the material, and the maximum specific capacitance of GO@NC-700 was 289.8 F·g −1 . At the same time, nitrogen-containing functional groups improved the selectivity to uranium and weakened the repulsive effect of coexisting ions. Therefore, the removal efficiency of GO@NC-700 electrode structure can reach 98.63 % at −1.2 V (vs. SCE, pH = 5). The maximum adsorption capacity of GO@NC-700 was 879.2 mg·g −1 , which was 4 times higher than that of simple adsorption (202.3 mg·g −1 ). The material had good cycle performance, and the capacity loss was less than 10 % after 5 cycles. The above results show that the GO@NC-700 electrode had special potential applications in removing uranium from aqueous solutions, which provides a new and effective method for the treatment of uranium-containing wastewater. Environmental implication Graphene oxide composite nitrogen-doped carbon (GO@NCs) can effectively separate uranium (VI) from the solution and reduce its threat to the environment and human body.
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Journal of Environmental Chemical Engineering
·
2026
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IF 7.5
Changmin Xiong,Limin Zhou,Dan Liu,Qiang Guo,Jinbo Ouyang,Ahmed M. Elgarahy,Khalid Z. Elwakeel
To address the shortcomings of existing chitosan/hydrotalcite adsorbent materials in terms of structural design and selectivity, this study successfully prepared an alanine-assisted ion-imprinted chitosan/Ca-Al hydrotalcite composite foam (ICAL) with a well-ordered honeycomb pore structure to enhance U(VI) adsorption performance. Among the ICAL materials prepared with different raw material ratios, the ICAL-2 foam exhibited a more ordered honeycomb structure and better homogeneous dispersion, and its ion memory effect facilitated rapid targeted capture of U(VI), thus demonstrating the optimal U(VI) adsorption performance. FTIR and XPS analysis results indicated that the N/O Lewis functional groups in ICAL-2 can effectively bind U(VI). The adsorption isotherm and adsorption kinetics could be described by the Langmuir model and pseudo-second-order model, respectively, indicating that monolayer chemisorption was dominant, with a saturated adsorption capacity of 333.9 mg/g at pH 5.0 and 298 K (the experimental capacity was 310.3 mg/g obtained at an initial U(VI) concentration of 100 mg/L). The adsorption of U(VI) by ICAL-2 was a spontaneous endothermic process, and it exhibited good adsorption selectivity for U(VI) in complex systems. The easily synthesized and recoverable ICAL-2 composite demonstrates promising potential for efficient treatment of uranium-contaminated wastewater through a targeted recognition-chemical complexation mechanism.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yan Li,Ying Dai,Wei Dai,Feiqiang He,Zhuyao Li,Xing Zhong,Qinqin Tao
Uranium and thorium of symbiotic relationship commonly appear in one kind of raw or spent ore. The simultaneous enrichment toward both metals in the first step is essential during many hydrometallurgy processing. Therefore bifunctional solid-state ionic liquid supported amidoxime chitosan (ACS) adsorbents were developed to simultaneously adsorb the two metal from the aqueous solution. The adsorption capacity of the bifunctional adsorbents toward uranium and thorium were significantly superior to the ionic liquid-free amidoxime chitosan, obviously proving the synergistic effect. For both uranium and thorium, the adsorption capacity in the consequence of ACS-[N 4444 ][DEHP], ACS-[N 4444 ][EHEHP], ACS-[N 1888 ][DEHP] and ACS-[N 1888 ][EHEHP] prove the steric effect and P O bonding played important roles in the adsorption. Study on isotherms and kinetics demonstrated the adsorption of ionic liquid-ACS adopted monolayer and chemical way. The Δ G o of very small negative values highlighted ionic liquid-ACS were prone to adsorb uranium and thorium. The study showed feasibility of bifunctional solid-state ionic liquid supported amidoxime chitosan adsorbents for Th(IV) and U(VI).
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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
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危险品化学品经营许可证（带存储）