RSC Advances
·
2021
·Vol. 11
·期 38
·23241-23248
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IF 3.361
Pingping Wang,Faqin Dong,Dengliang He,Shuxin Liu,Ning Chen,Tingting Huo
The photoelectrochemical reduction of U(VI) is recognized as an economical and effective way to eliminate radioactive pollution. In this study, we construct a α-Fe2O3/TiO2 film electrode-based photoelectrochemical cell to remove U(VI) and recover uranium from aqueous solution. Citric acid and oxalic acid could act as hole scavengers, being favorable for the photocatalytic reduction of U(VI). In the presence of 0.5 mM citric acid and oxalic acid, the uranium removal capacity reached 70% and 58%, respectively, while 24% was achieved for the system in the absence of acid. The XRD, SEM, FT-IR and XPS results revealed that a proportion of U(IV) was also precipitated as surface associated metastudtite. These novel observations have significant implications for the behavior of uranium within engineered and natural environments.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zequan Liu,Tao Ou,Minhua Su,Hairong Peng,Gang Song,Lingjun Kong,Diyun Chen
Uranium and uranium-containing pollutants are excessively released into the environment, leading to serious water and soil contamination. Minerals such as alumina are naturally abundant and frequently affect the fate and migration behavior of uranium ions. A thorough understanding of the migration and immobilization behavior of uranium on Al-rich minerals (e.g., α-alumina [α-Al 2 O 3 ] and γ-alumina [γ-Al 2 O 3 )]) is essential for unraveling numerous environmental issues. We performed a systematic comparative analysis of U(VI) retention by α-/γ-alumina. The effects of coexisting ions and natural organic matter were explored. Solution pH contributed critically to the retention of U(VI) by α-/γ-alumina. The adsorption rate of γ-Al 2 O 3 for U(VI) removal was faster than that of α-Al 2 O 3 , reaching equilibrium within 15 min with a high removal efficiency of 94.43%. PO 4 3− ions significantly promoted U(VI) adsorption, especially for the case of α-Al 2 O 3 . The addition of phosphate resulted in a 15-fold enhancement in adsorption capacity. Humic acid promoted U(VI) removal by γ-Al 2 O 3 under acidic conditions while strong inhibition on both α-Al 2 O 3 and γ-Al 2 O 3 in basic conditions. The removal mechanism of U(VI) by alumina is mainly ascribable to electrostatic interaction and surface complexation from various oxygenated functional groups. The present findings are pivotal to the understanding of uranium migration and immobilization in the environment.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2026
·
IF 1.7
Wang Xinyu,Qin Yilin,Gong Junyuan,Zhang Guohao,Peng Yinyin,Sun Gen,Ji Yanhao,Huang Yaling,Li Yahui,Nie Xiaoqin
This study aimed to enhance U(VI) removal from water by constructing a ternary system of Shewanella putrefaciens ( S. putrefaciens ), chlorite, and humic acid (HA). The ternary system achieved significantly higher U(VI) immobilization than single or binary systems, owing to synergistic effects of adsorption enrichment, electron shuttling, and bioreduction. Under optimal conditions, the U(VI) removal efficiency reached 91.6%. Importantly, pre-forming the ternary composite before U(VI) addition avoided false removal caused by HA-U(VI) complexation, ensuring accurate assessment of reductive immobilization. This work provides a reliable strategy for uranium-contaminated water remediation. Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hao Lei,Ning Pan,Hao Zou,Xiaoqiang Wang,Xianguo Tuo
Efficient removing uranium (U(VI)) from highly acidic environment remain a great challenge for the adsorbent. Herein, a novel hollow phytic acid-based hybrid material (P(Cr)E-7) was synthesized by a mild facile one-pot self-assembly method without template choosing Cr 3+ , phytic acid (PA) and ethylenediamine (EDA) as the inorganic and two organic building blocks. P(Cr)E-7 was employed for U(VI) capture in highly acidic wastewater. Thanks to the flexible segment assembled from EDA and PA, and the strong affinity of PA to U(VI), the maximum adsorption capacity of P(Cr)E-7 for U(VI) reached 282.8 mg/g under the condition of pH = 1.0 in static adsorption experiment. Simultaneously, P(Cr)E-7 showed the selectivity efficiency of almost 100 % for An-Ln and pH-dependent selectivity efficiency of 60 % for U(VI) in multi-ions solution with pH = 1.0. Moreover, P(Cr)E-7 showed excellent stability in 0.1 M HNO 3 and reusability after three cycles at pH = 1.0 benefiting from stable segment from coordination of Cr(III) and PA. Additionally, the SEM, XRD , FTIR, and XPS analysis revealed the adsorption mechanism that U(VI) exchanges with positively charged EDA + /EDA 2+ in P(Cr)E-7 to obtain preferred coordination geometry and ligand environment and further coordinates with P-OH/P = O in PA. This study addresses the practical application of effective adsorption of uranium in highly acidic nuclear industrial wastewater and illustrated a novel material design strategy of adsorbents for uranium extraction.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Ying Dai,Yan Li,Wenmei Hu,Qinqin Tao,Zhirong Liu
Lanthanides/actinides separation is of importance in many modern industrial engineering fields, e.g. the circulation of the nuclear fuel and rare earth. N,N-dioctyl diglycol amic acid (briefly as DODGA) is known as an effective extractant for extraction of rare earth metal. In this work, two extractants, [N 1888 ][DODGA] and [N 4444 ][DODGA], were developed by using quaternary ammonium as cations and DODGA as anion. The resultant ionic liquids were used to separate europium from europium-uranium binary component system. The influence of several factors (nitric acid concentration, contact time, temperature, metal ions, extractant concentration, salting agent concentration and stripping) were analyzed. The coordination chemistry of Eu(III) with [N 1888 ][DODGA] and [N 4444 ][DODGA] were investigated by the mole-ratio method. The experimental results confirmed that the separation factors ( SF ) of Eu(III)/U(VI) were reached 55.44 and 60.35 for [N 1888 ][DODGA] and [N 4444 ][DODGA]. The stoichiometry of the complex of Eu(III) and [N 1888 ][DODGA] or [N 4444 ][DODGA] were determined as 1:3. Excellent extraction of the target metals and prominent separation factors using these ionic liquids showed that they were viable to separate lanthanides from actinides.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Yong Zhang,Siqi Huang,Bingyu Mei,Xiaoyu Tian,Lingyi Jia,Wenkun Zhu
Polydopamine/polyethyleneimine-grafted fly ash composite (PDA/PEI/FA), an efficient multifunctional adsorbent for U(VI) with excellent separation efficiency (94.5 %) and capacity (422.5 mg/g), was synthesized by grafting PDA and PEI on FA via Mussel inspiration and Michael addition reaction. The introduction of PDA and PEI had brought numerous functional groups with fine affinities to uranium, like catechol, amino and imino, causing good U(VI) separation performances. Langmuir and Pseudo-second-order models were well matched with experimental data, illustrating the U(VI) separation on PDA/PEI/FA was a homogeneous chemical adsorption process. After five cycles, the U(VI) adsorption efficiency for PDA/PEI/FA was still up to 90.2 %, implying that PDA/PEI/FA possessed good stability and reusability. Besides, the good dynamic adsorption performances of PDA/PEI/FA further demonstrated that PDA/PEI/FA was an ideal adsorbent for the practical wastewater treatment. According to the characterization results, U(VI) was absorbed by PAD/PEI/FA through complexation, redox reaction, electrostatic attraction and hydrogen bonding. Given the above, PDA/PEI/FA showed good practical application prospect in U(VI) separation.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 321
·期 2
·733-745
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IF 1.186
Hu Peizhuo,Nan Yu,Tai Wenya,Shan Qiang,Zhong Yi,Lei Zhiwei,Liu Tonghuan,Chen Suwen,Qian Lijuan
Modification of silica gel by butanedioic anhydride (SiO 2 –BDAH) results in efficient adsorbents for removal of U(VI), Th(IV), and Eu(III) from aqueous solutions. SiO 2 –BDAH was characterized by Fourier Transform infrared spectroscopy, elemental analysis, N 2 adsorption–desorption isotherms, thermogravimetic analysis, and potentiometric titration. The effect of contact time, pH, and initial concentration of radioactive solutions and temperature on the adsorption capacity of the sorbent was investigated. The sorption equilibrium times of U(VI), Th(IV), and Eu(III) onto SiO 2 –BDAH were 1.5, 2, and about 10 h. The sorption percentages of U(VI), Th(IV), and Eu(III) increased with increased pH from 1 to 5. The sorption process of U(VI), Th(IV), and Eu(III) can be described by the Langmuir model, with sorption capacities of 5.10 × 10 −5 , 5.06 × 10 −5 , and 3.44 × 10 −5 mol/L, respectively. The enthalpy and entropy changes were all positive, whereas the free energy changes were negative. This study indicated that SiO 2 –BDAH can remove U(VI) and Th(IV) at the same time in the presence of multiple ions from waste water quickly.
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ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Donglin Zhao,Yangyang Wang,Siyu Zhao,Muhammad Wakeel,Zheng Wang,Rehan S. Shaikh,Tasawar Hayat,Changlun Chen
In this study, graphene aerogel (GA) was successfully prepared through a simple hydrothermal method. The resulting GA exhibited a porous network structure with a large specific surface area (350.8 m 2 /g), ultra-light mass and easy separation from water. The pH IEP value of the GA was estimated to be 3.5. The adsorption process and the factors that affect adsorption capacity were studied. The adsorption could be conducted in a wide pH range from 2.0 to 7.0. The maximum adsorption capacity of GA towards U(VI) at pH 4.0 and T = 298 K was 238.67 mg/g calculated from the Langmuir model. The GA had greatly rapid adsorption property for the removal of U(VI) at pH 4.0. Kinetic data showed good correlation with pseudo-second-order equation. Fourier transform infrared spectroscopy and X-ray photoelectron spectrometry characterizations showed that GA adsorbed U(VI) through chemical interaction by oxygen-containing and nitrogen-containing groups functional groups. The results show that GA has excellent application potential as an adsorbent material for removing U(VI) from aqueous solution.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 316
·期 1
·49-59
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IF 1.181
Ji Guojia,Zhu Guiru,Wang Xingjun,Wei Yulin,Wu Hui,Yuan Junsheng,Gao Congjie
In order to reduce the loss of particles during the cycling operation, a technology for the granulation of short channel SBA-15 adsorbent was developed. The adsorption behavior of obtained granules was studied under various factors including initial pH value, contact time in different initial concentration and acid stability by batch experiments. A continuous packed column loaded with granules was performed to remove U(VI) from aqueous solution. The uranium concentration was highly enriched than feed solution. The granules packed in column exhibited excellent reusability through cycling test. The result showed promising application prospect in the uranium extraction from aqueous solution.
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Inorganic Chemistry Frontiers
·
2018
·Vol. 5
·期 6
·1321-1328
·
IF 5.106
Wenting Li,Qi Liu,Rongrong Chen,Jing Yu,Hongsen Zhang,Jingyuan Liu,Rumin Li,Milin Zhang,Peili Liu,Jun Wang
Herein, we report on magnetic microspheres with numerous imine groups on the surface, which have great potential for U(VI) recovery in seawater. Hyperbranched polyethylenimine (HPEI) was covalently grafted onto the surface of the core–shell structured microspheres Fe3O4@SiO2. The microstructure and chemical composition of Fe3O4@SiO2-HPEI were comprehensively characterized. Consequently, the adsorption performance at low concentrations (3–30 μg L−1) under simulated seawater was investigated and the removal rate reached more than 90%. The superior performance of the Fe3O4@SiO2-HPEI is attributed to electrostatic force and chemical bonding (between amine/imine groups and U(VI)). We recommend, therefore, Fe3O4@SiO2-HPEI as a prospective alternative adsorbent in U(VI) recovery from seawater.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2015
·Vol. 307
·期 1
·269-276
·
IF 1.034
Luo Bai-Cheng,Yuan Li-Yong,Chai Zhi-Fang,Shi Wei-Qun,Tang Quan
Metal–organic frameworks (MOFs) UiO-66 and its amine derivative (UiO-66-NH 2 ) with high surface area and unprecedented chemical stability were synthesized and first explored for U(VI) capture from aqueous solutions. At pH 5.5, U(VI) sorption reach equilibrium in ca. 4 h and the maximum sorption capacity is more than 100 mg g −1 . Moreover, they show desirable selectivity towards U(VI) over a range of competing metal ions. Sorption results demonstrate that introduction of amino groups into MOFs does not enhance U(VI) sorption, probably result from the lower activity of aromatic amines, decrease of surface area and formation of intermolecular hydrogen bonds.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Jialin Qiu,Ye’an Zhu,Bo Wang,Yidan Nie,Zengkai Song,Peng Li,Zongbo Xie,Zhanggao Le
Photocatalytic removal of hexavalent uranium is an effective method for reducing radioactive uranium contamination in water. Herein, novel heterojunction catalysts, bismuth vanadate/hydrothermal carbon nitride (BiVO 4 /HCN), were synthesized and firstly successfully implemented for uranium removal. For example, the removal rate of U(VI) over 0.10BiVO 4 /HCN reached 98.5 % for the first time and more than 95.9 % for five consecutive cycles. Subsequent characterization analyzes confirmed that increased specific surface area, redshift of the absorption band, and efficient charge separation of the photogenerated electron-hole pairs collectively contributed to the improved photocatalytic performance. Noteworthily, free radical quenching and electron spin resonance spectroscopy results indicate that holes, photogenerated electrons, and superoxide radicals are the major active species for the photoreduction of U(VI). Finally, a possible photocatalytic mechanism of U(VI) removal was proposed.
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