JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 316
·期 1
·49-59
·
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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RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
He Yan,Du Qingwang,Wen Shuna,Yu Tong,Wang Na,Yuan Dingzhong,Na Bing
In this work, an amine functionalized porous organic polymer (POP-ABP-NH 2 ) was synthesized by one-step Friedel–Crafts alkylation reaction using 2-aminobiphenyl as an organic monomer and p-dichlorobenzyl as a crosslinker. Then, POP-ABP-NH 2 was functionalized with different concentrations of phytic acid (PA, 30% and 50%) through hydrothermal reaction, and new phytic acid-modified porous organic polymers (POP-ABP-PA-1 and POP-ABP-PA-2) were successfully synthesized. The adsorption performance of the adsorbents for U(VI) ions in aqueous solution and simulated seawater was studied. The results show that the higher PA concentration, the smaller the specific surface area ( S BET POP-ABP-PA-2 (185.84 m 2 /g) < S BET POP-ABP-PA-1 (598.43 m 2 /g)). This may be because the high concentration of PA occupies more pore sites, resulting in a decrease in specific surface area. The adsorption kinetics of the materials for U(VI) conform to the pseudo-second-order kinetic adsorption model, and the adsorption isotherm conform to the Langmuir monolayer adsorption model. Under the optimal adsorption conditions, the maximum adsorption capacity of POP-ABP-PA-2 for U(VI) (q max = 1372.2 mg/g) is much higher than that of POP-ABP-PA-1 (q max = 769.2 mg/g). This may be because POP-ABP-PA-2 is connected to a high concentration of PA and has a high phosphorus and oxygen content, resulting in stronger coordination ability and higher adsorption capacity. Most importantly, in simulated seawater at pH = 8, POP-ABP-PA-2 exhibited a high theoretical adsorption capacity of 299.4 mg/g in 150 min. In addition, in a solution where many impurity ions coexist, POP-ABP-PA-2 can still exhibit excellent adsorption selectivity for U(VI), and after five adsorption–desorption cycles, the adsorption removal percentage of U(VI) can still be maintained at 90%. This study provides an important research idea for further developing phytic acid (PA) composites for U(VI) adsorption.
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Journal of Water Process Engineering
·
2021
·
IF 5.485
Yujing Zhang,Xiaoqin Nie,Faqin Dong,Ning Pan,Congcong Ding,Chang Liu,Junling Wang,Wencai Cheng,Mingxue Liu,Huichao He,Shiyong Sun,Xue Xia
It is of great significance to develop an adsorbent with high adsorption capacity and excellent resistance to anion and cation interference toward the removal of U(VI). Herein, a novel polyamine-modified polyacrylonitrile-based fiber (PAN PA ) has been synthesized through hydrothermal method , which can validly remove U(VI) from solution. Combined with mesoscopic, spectral characterization and simulation method, the removal behavior and mechanism of U(VI) from high fluorine uranium-containing wastewater by PAN PA are systematically investigated. The results show that, based on the strong coordination principle of polyamine group and UO 2 2+ , PAN PA can selectively remove U(VI) from wastewater. In addition, the q max of 459.27 mg g −1 was more than that of many other adsorbent materials . More importantly, PAN PA is not affected by high concentration of F − , and exhibits higher distribution coefficient (559,900 mL g −1 ) and removal efficiency (99.5%) to U(VI) than other coexisting ions in real wastewater . Furthermore, the column experiment was also implemented to remove U(VI). The results indicate that PAN PA is a promising material to effectively remove U(VI) from real wastewater produced during the fabrication of nuclear fuel elements .
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ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Jiali Liu,Xianbiao Wang,Yangyang Zhao,Yongfei Xu,Yang Pan,Shaojie Feng,Jin Liu,Xianhuai Huang,Huanting Wang
Radioactive U(VI) in nuclear wastewater is a global environmental pollutant that poses a great threat to human health. Therefore, it is of great significance to develop a U(VI) sensor with desirable sensitivity and selectivity. Inspired by electron-donating group modification for enhancement of binding affinity toward U(VI), we report an amine group functionalization of UiO-66-NH2, using a low-cost, environmentally friendly, and low-temperature NH3 plasma technique as a fluorescence switching nanoprobe for highly sensitive and selective detection of U(VI). The resulting amine-functionalized UiO-66-NH2 (LTP@UiO-66-NH2) shows dramatically enhanced fluorescence emission and selective sensitivity for U(VI) on the basis of the quenching effect. The quenching efficiency increases from 58 to 80% with the same U(VI) concentration (17.63 μM) after NH3 plasma functionalization. As a result, the LTP@UiO-66-NH2 has the best Ksv (1.81 × 105 M–1, 298 K) and among the lowest LODs (0.08 μM, 19.04 ppb) compared with those reported in the literature. Intraday and interday precision and application in real environment experiments indicate stable and accurate U(VI) detection performance. Fluorescence lifetime and temperature-dependent detection experiments reveal that the quenching mechanism belongs to the static quenching interaction. The highly selective fluorescence detection is attributed to the selective binding of U(VI) by the rich functionalized amine groups of LTP@UiO-66-NH2. This work provides an efficient fluorescence probe for highly sensitive U(VI) detection in water, and a new strategy of tailored plasma functionalization for developing a practical MOF sensor platform for enhanced fluorescence emission, sensitivity, and selectivity for detecting trace amounts of radioactive species in the environment.
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Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 4
·1011-1021
·
IF 5.934
Junping Ma,Qiuyu Zhao,Dongli Wei,Haiqiang Liu,Xiangke Wang,Zhe Chen,Jianjun Wang
The adsorption remediation of radioactive contamination from wastewater is scientifically and economically important. In this work, titanium dioxide-modified manganese dioxide (MnO2@TiO2) was prepared by immobilizing crystalline anatase titanium dioxide (TiO2) on the surface of alpha manganese dioxide nanowire (MnO2). The base material MnO2 nanowire acted as a physical template for the guest TiO2, and the formed MnO2@TiO2 composite exhibited a highly uniform core–shell nanorod structure. The MnO2@TiO2 composite was investigated as an efficient adsorbent for the removal of U(VI) from aqueous solution. In the same system, MnO2@TiO2 exhibited a much higher maximum adsorption capacity (105.3 mg g−1) for U(VI) as compared with MnO2 (13.3 mg g−1), showing that the performance of the surface-modified MnO2 was greatly improved. The fitting results for kinetic and isothermal models manifested that U(VI) ion adsorption by MnO2@TiO2 involved monolayer chemisorption. Characterization before and after adsorption was performed and the results compared and analyzed carefully, with the conclusion that there might be three kinds of interactions between U(VI) and MnO2@TiO2 during the adsorption process, namely inner-sphere surface complexation, chemical precipitation, and electrostatic interaction. The low-cost, facile fabrication method and efficient performance endow the adsorbent MnO2@TiO2 with a high potential for U(VI) removal from actual wastewater.
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Journal of Hazardous Materials Advances
·
2021
·
IF 0
Xiao-Yu Zhang,Jing-Jing Wang,Ping Li,Yu-Jia Xiao,Zhao-Yi Tan,Yan-Rong He,Nuzahat Habibul
Herein, Fe 3 O 4 /g-C 3 N 4 composites with different proportions were prepared to remove U(VI) from wastewater through photocatalytic reduction. The morphology, composites, and magnetism of the Fe 3 O 4 /g-C 3 N 4 composites were measured. The characterization results showed that Fe 3 O 4 nanoparticles were well distributed on the surface of g-C 3 N 4 , resulting in the good magnetism and corresponding excellent separation ability of the composites. The U(VI) removal efficiency of the composites with different ratios of Fe 3 O 4 and g-C 3 N 4 was also determined. It was found that Fe 3 O 4 /g-C 3 N 4 with an Fe content of 14% showed the highest U(VI) removal efficiency of 98.7% after 25 min. The photocatalytic reaction rate constant was 0.161 min −1 , which was 2.9 times that of pure g-C 3 N 4 and 2.4 times that of pure Fe 3 O 4 . In addition, after five reaction cycles, the composite showed high photoreduction activity and magnetic properties.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yi Wang,Geng Chen,Hanqin Weng,Lan Wang,Jialiang Chen,Sheng Cheng,Peng Zhang,Mozhen Wang,Xuewu Ge,Hongbing Chen,Wei Huang,Mingzhang Lin
Effectively separating uranium from aqueous solution is pivotal in the sustainable development of the nuclear industry and environmental protection. In this work, non-metal photocatalysts, carbon-doped BN (BCN) nanosheets were used to extract uranium by the photocatalytic reduction technique, and the doping in the form of carbon rings can regulate the bandgap and electronic structure by manipulating carbon amount. Benefiting from the porous structure and strong visible-light absorption, the U(VI) separation ratio of 97.4% could be achieved after 1.5-hour visible irradiation with an apparent rate value of 2.97 h −1 over BCN-80. Additionally, BCN-80 displayed good reusability and stability with the U(VI) separation ratio > 90% even after five cycles, and the enhanced U(VI) photoreduction was attributed to the synergistic effect of photoinduced electrons and formed ketyl radicals. This work demonstrates the great potential of BCN materials in U(VI) enrichment and will lay the foundation for further developing novel semiconductor photocatalysts.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Rongshuo Guo,Linghua Jin,Hongqing Wang,Ruibin Wang,Xinyi Zhang,Ye Zhang
Effective catalytic methods and catalysts for the simultaneous removal of coexisting organic pollutants and heavy metal ions are crucial for sustainable and environmentally friendly water purification. Herein, flower-like S-scheme In 2 Se 3 @Ag 3 PO 4 heterojunctions were synthesized by a two-step hydrothermal method for simultaneous removal of uranium (VI) (U(VI)) and organic pollutants using piezo-photocatalysis. Characterization and theoretical calculations confirmed the formation of the heterojunction, highlighting the significance of In O and Se P bonds in the S-scheme for enhancing photocatalytic reactions by improving charge carrier separation and migration. Additionally, the piezoelectric polarization electric field can also improve photocatalytic performance. The optimized In 2 Se 3 @Ag 3 PO 4 –3 catalyst demonstrated superior piezo-photocatalytic performance in synergistically removing U(VI) and degrading organics, such as tetracycline (TC), bisphenol A (BPA), carbamazepine (CBZ), levofloxacin (LVX), and norfloxacin (NOR). Particularly, in the presence of TC, the catalyst achieved 98.7 % U(VI) removal, and 94.1 % TC degradation within 30 min. This study introduces a promising strategy and a novel heterojunction catalyst with dual functional properties for the simultaneous treatment of wastewater containing organic pollutants and U(VI).
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yizhi Chen,Peng Zhang,Limin Jiao,Geng Chen,Yu Yang,Hanbao Chong,Mingzhang Lin
Separating and recovering uranium (U(VI)) efficiently from lanthanides is crucial for mitigating the radioactive hazard generated by hydrometallurgical residual solutions of lanthanide minerals and ensuring the long-term sustainability of uranium resources. The present work exploited phenanthroline diamide functionalized porous carbon doped boron nitride (BCN-DAPhen) as an adsorbent, which displayed outstanding adsorption performance for the separation of U(VI) from lanthanides. The results of batch adsorption tests indicated that BCN-DAPhen exhibited rapid adsorption kinetics and the adsorption process achieved equilibrium within 10 min. BCN-DAPhen also performed ultra-high maximum adsorption capacity that was calculated to be 2050.8 mg g −1 by fitting with the two-site Langmuir model. Theoretical calculation and experimental results of adsorption were combined to illustrate the adsorption mechanism as well, the results showed that two structures of DAPhen groups on BCN performed discrepant adsorption properties for U(VI). BCN-DAPhen retained excellent adsorption ability owing to the strong affinity of DAPhen groups with U(VI) even in the solution with high concentration of salt and acid. The selectivity coefficients of U(VI) toward various lanthanides were beyond 192.5 at a high nitric acid concentration of 5 mol L −1 . This study suggested a general technique for the functionalization of porous BCN, which is expected to be useful in the treatment of residual solution in lanthanides hydrometallurgy.
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RADIOCHIMICA ACTA
·
2021
·Vol. 109
·期 10
·759-771
·
IF 1.44
You-qun Wang,Huan Wang,Yue Feng,Zhi-bin Zhang,Xiao-hong Cao,Yun-hai Liu
In this work, diethylenetriamine pentamethylenephosphonic acid (DTPMP) was ultilized into preparing of Zr(IV) organophosphates hybrids (Zr-DTPMP- x , x was the molar ratio of Zr(IV)/DTPMP in the synthetic process, x = 0.5, 1, 2, and 3) using a hydrothermal method. The physical and chemical properties of Zr-DTPMP- x were characterized by SEM&EDS, FT-IR, XRD, Zeta potential, XPS, TGA and contact angle analysis. Moreover, the adsorptive performances of Zr-DTPMP- x for U(VI) were investigated. The adsorption results showed that the optimum molar ratio of Zr(IV) to phosphine, pH, equilibrium time, and dosage was 0.5, 4.0, 180 min, and 10 mg, respectively. Besides, the adsorption of U(VI) was in accordance with the pseudo-second-order kinetic model and Sips isothermal model. Moreover, the adsorption capacity determined by Sips isothermal model was 181.34 mg g −1 for Zr-DTPMP-0.5. Furthermore, the adsorptive selectivity of Zr-DTPMP-0.5 for U(VI) was superior than the others. Zr-DTPMP-0.5 may be a powerful candidate for diminishing the contamination of U(VI).
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Linkai He,Xingqiang Wu,Yixin Pan,Faquan Wu
The mining of uranium ore and the disposal of nuclear power plant waste may lead to uranium contamination. Particularly in aquatic environments, uranium exhibits high solubility and mobility, thereby causing severe radioactive pollution to groundwater, soil, and ecosystems. Such contamination poses significant challenges for remediation efforts. In this study, we synthesized a composite material (Ni-TiN) composed of nano-titanium nitride (TiN) and zero-valent nickel using an in-situ reduction method, achieving efficient uranium adsorption and reduction. The experimental results demonstrated that under the conditions of 303 K and pH = 5, the maximum uranium adsorption capacity reached 418.97 mg/g, accompanied by a significant enhancement in the removal rate. The experimental data perfectly fit the pseudo-second-order kinetic model. Combined with density functional theory (DFT) calculations, this indicates that the removal process of U(VI) by the composite material involves a combination of chemical reduction and complexation, further elucidating its adsorption mechanism. In the presence of multiple ions, only a few ions significantly inhibited U(VI) removal. These findings suggest that Ni-TiN exhibits exceptional environmental adaptability and selective adsorption capacity, highlighting its significant potential in the field of environmental remediation.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wen He,Qianxiang Xiao,Haiyan Jiang,Zhenglemei Qiu,Ziyang Chang,Feng He,Qixu Chen,Xiangke Wang,Hongqing Wang
Enhanced bulk-surface charges separation and migration are essential to maximize the photocatalytic activity. In this study, ethylenediamine (EDA)-modified Zn 0.7 Cd 0.3 S nanorods (ZCS-NR-EDA) were synthesized through an integral modification approach. After 1-hour adsorption equilibrium followed by 6-minute co-irradiation with visible light and ultrasonic waves, ZCS-NR-EDA removed 99.2 % of U(VI) from the solution, significantly better than Zn 0.7 Cd 0.3 S nanoparticles (ZCS-NP) (13.6 %) and Zn 0.7 Cd 0.3 S nanorods (ZCS-NR) (25.3 %). This catalytic performance has outperformed most reported materials. Experimental and density functional theory (DFT) calculation studies confirmed that EDA modification induced polarization to establish a bulk electric field (BEF) and modified the electron distribution at the material's surface to create localized surface electric field (LSEF), while simultaneously enhancing the material's piezoelectric properties. The synergistic effect of these triple electric fields (polarization-induced BEF, LSEF, and piezoelectric field (PF)) promoted migration of bulk-surface charges, thereby enhancing catalytic performance. When applied to uranium spiked tailing water, ZCS-NR-EDA achieved up to 98.1 % U(VI) removal within 15 min of combined visible light and ultrasonic irradiation (after adsorption equilibrium). More importantly, this “tri-electric fields synergy” strategy provides a novel approach for the design of advanced photocatalytic materials.
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