APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Feng He,Qianxiang Xiao,Yin Chen,Hongqing Wang,Xiangke Wang
In the photoreduction of U(VI), protective gases and additional sacrificial agents are still the major obstacles. Herein, we developed an oxygen-deficient WO x /g-C 3 N 4 catalyst for the simultaneous reduction of U(VI) and preparation of benzaldehyde by selective oxidation of benzyl alcohol without protective gases and sacrificial agents. The removal of U(VI) by WO x /g-C 3 N 4 could reach 98.5% and the conversion of benzyl alcohol was nearly 32% with a selectivity close to 100%. Compared with single g-C 3 N 4 and defect-free WO 3 , the photoreduction activity of WO x /g-C 3 N 4 was 10.4 and 7 times higher, respectively. Besides, the role of oxygen and oxygen defects was explored. Owing to oxygen defects in the catalyst, oxygen was adsorbed on the oxidation end (WO x ) of the catalyst and activated without entering the reduction end to interfere with the photoreduction of U(VI), while favoring the generation of •O 2 - to improve the selectivity of benzaldehyde. Finally, a new mechanism was proposed.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
You Yanran,Zhu Hongtao,Dong Hongliang,Sheng Guodong
In this work, FeS was anchored on mesoporous silica microspheres (SiO 2 200, SiO 2 500, and SiO 2 1000), and named as FeS@SiO 2 (i.e., FeS@SiO 2 200, FeS@SiO 2 500, FeS@SiO 2 1000), in adsorbing and detoxifying U(VI)/Cr(VI) from wastewater. Results demonstrated that FeS@SiO 2 exhibited higher efficiency towards U(VI)/Cr(VI), outperforming FeS and SiO 2 alone. Kinetic investigations revealed that adsorption of U(VI)/Cr(VI) followed pseudo–second–order model best, highlighting effective chemical interplay. XPS investigations demonstrated multi–species which was included FeS, Fe(II), S 2− and polysulfide (S 2 2− , S n 2− ) could be employed as reductants for U(VI)/Cr(VI) adsorption. The combination of SiO 2 and FeS offered an enhanced efficiency for U(VI)/Cr(VI), making these composites promising materials in water purification. Graphical
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2026
·
IF 1.7
Pei Xule,An Xueli,Zhang Kan,Li Xuyang,Liang Zongsheng
Since N-/P-containing functional groups can react with aquatic U(VI) effectively, the development of adsorbents with sufficient N-/P-containing species and developed porosity is highly desirable. Herein, guanylurea phosphate-activated biochars (GPBs) with abundant surface N/P-containing groups (4.2–13.1 at.% for N and 1.7–4.6 at.% for P) and high surface area (17.2–484.6 m 2 /g, which were 2.5–16.9 times than unmodified biochars) were fabricated via the pyrolysis of waste straw at 300 °C, 500 °C, and 700 °C. By evaluating multiple hydrochemical conditions, U(VI) was adsorbed by GPBs with rapid kinetic (4 h) and excellent q max (120.4–209.6 mg/g). The mineralization of aquatic U(VI)-phosphate as hydrogen uranite enabled the superior selectivity for U(VI) uptake from simulated nuclide-containing water against interfering coexisting metals. A favorable reusability (88.2% and 85.4% of initial uptake capacity kept after six cycles) was achieved via desorbing GPBs by HCl solution and Na 2 CO 3 solution, respectively. This work provided a valuable reference for the preparation of functional biochars to efficiently and selectively capture U(VI).
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Huanyu Zhou,Fan Yu,Minghui Qiu,Xiaowei Da,Xianfu Chen,Kaiyun Fu,Yiqun Fan
A rapid co-sintering strategy is developed for CeO 2 nanofiltration membranes. • The membrane exhibits an ultra-narrow pore size distribution. • The membrane achieves a U/V separation factors of 326 in natural seawater. • The permeance reaches 21.6 L·m −2 ·h −1 ·bar −1 in natural seawater. • The strategy cuts fabrication time to 0.7 h and reduces energy consumption by 98.8%. Extracting uranium from seawater is essential for the sustainable development of nuclear energy. The highly selective uranium extraction remains challenging due to the extreme physicochemical similarity between uranium (U) and vanadium (V). Despite the sub-nanometer sieving capability of ceramic nanofiltration membranes, the conventional sintering required for structural integrity inevitably broadens the pore size distribution, thereby compromising selectivity toward closely sized ion pairs. This work proposes a rapid co-sintering (Co-RTP) strategy that utilizes radiation-induced ultra-fast heating and an adaptive co-sintering mechanism to construct a uniform CeO 2 selective layer within minutes, achieving a narrow pore size distribution (PSD) with a coefficient as low as 1.097. This ultra-narrow PSD effectively intensifies the U/V separation. In natural seawater, the membrane achieves a remarkable U/V separation factor of 326 and a permeance of 21.6 L·m −2 ·h −1 ·bar −1 . Moreover, the route reduces fabrication time from 110.6 h to 0.7 h and lowers energy consumption by 98.8%. This rapid co-sintering method provides a simplified and efficient fabrication route for precision ceramic membranes, and the resulting CeO 2 membrane holds great promise for challenging precision separations such as uranium extraction from seawater. Download: Download high-res image (222KB) Download: Download full-size image
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DESALINATION
·
2026
·
IF 9.8
Huazhen Rong,Jiashun Mao,Yue Ma,Xiaohui Yan,Min Luo,Handan Wen,Tao Liu,Yihui Yuan,Ning Wang
Uranium-contaminated water streams associated with nuclear fuel cycle operations represent an emerging challenge in water purification, combining radiological risk with the opportunity for resource recovery. Developing sustainable uranium removal technologies that operate under mild conditions while minimizing chemical inputs remains a critical task, particularly for integration into advanced water treatment systems. Herein, we report a donor-acceptor covalent organic framework (DANT-TFPT) featuring an in-framework coupled H 2 O 2 production and consumption (IFC-HPC) architecture for photocatalytic uranium removal. By co-localizing oxygen reduction reaction catalytic sites and uranyl-binding pockets within a single scaffold, photogenerated H 2 O 2 is produced and consumed in-situ, minimizing diffusion losses and nonproductive decomposition. Together with strong donor-acceptor coupling and abundant N/O-rich coordination domains, the DANT-TFPT exhibits a high H 2 O 2 evolution rate under ambient air to achieve an exceptional U(VI) uptake capacity of 745.7 mg g −1 with a fast removal rate of 67.8 mg g −1 h −1 without sacrificial reagents in uranium-contaminated wastewater. This study demonstrates a chemical-efficient and environmentally benign strategy for the removal and recovery of uranium from contaminated waters, highlighting the potential of integrated photocatalytic-sorptive materials for emerging contaminant control and resource recovery in water purification and desalination-related treatment processes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Feng Li,Dan Zhou,Yaoping Guo,Keng Xuan,Yingqi Wang,Ying Zheng,Xuegang Wang,Zhanxue Sun,Yadan Guo
The contamination of water by soluble hexavalent uranium (U(VI)) requires the development of highly active and stable treatment materials. This study presents a rational design for a heterostructured photocatalyst by coupling phosphorus-modified graphitic carbon nitride (PCN) with NiAl-layered double hydroxide (NiAl-LDH). The structural theory was that P-doping would tailor the optoelectronic properties of g-C₃N₄, while integration with NiAl-LDH would establish a synergistic system for concurrent adsorption and photoreduction. As anticipated, the P modification inhibited crystal growth and improved charge separation in g-C₃N₄, elevating its U(VI) reduction rate by 3.67-fold. The NiAl-LDH component provided a high-specific-surface-area substrate for pollutant enrichment. The resulting optimal NiAl-LDH/PCN composite formed a Type-II heterojunction, which directed efficient charge transfer between the two phases. Under simulated sunlight, the composite achieved high removal efficiencies of 96.0% for U(VI) and 95.2% for Cr(VI). The performance stems from a synergy where NiAl-LDH concentrates target ions at the interface, and PCN furnishes photogenerated electrons via facilitated charge transfer, thereby accelerating the photoreduction kinetics. The material also demonstrated robust reusability and effectiveness in treating actual wastewater, highlighting its strong potential for practical heavy-metal-ion remediation.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 5
·1801-1817
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IF 3.3
Wu Zhiwen,Wang Bo,Zhu Yean,Xue Jinming,Nie Yidan,Xie Zongbo,Le Zhanggao
It is critical to recover uranium from wastewater containing U(VI) and to ensure the commercial development of nuclear-related energy sources. The extraction and recovery methods of uranyl ions from contaminated areas have become clearer with the rapid development of photocatalytic technology. However, there are several challenges, such as low-charge carrier migration and a lack of active sites. Crystallized carbon nitride (CCN) catalysts at different temperatures were successfully obtained to improve the efficiency of photocatalytic reduction of uranium. The characterization results show that the crystallinity of the material increased and improved the electron–hole separation efficiency. We investigated the effects of catalyst dosage, pH value of a solution, and concentration of U(VI) on the photocatalytic reactions as well as the photoreduction mechanisms. The efficiency of photocatalytic reduction of uranium is enhanced by 2.5 times with good stability in five cycles compared with bulk carbon nitride. The results demonstrate that CCN can effectively remove U(VI) by photocatalytic reduction, which has a wide range of applications prospects in the treatment of uranium-containing wastewater.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Fenglei Liu,Shanshan Wang,Baowei Hu
Herein, a MXenes decorated nanoscale FeS composites were developed via electrostatic self-assembly strategy to achieve efficient U(VI)/Cr(VI) adsorption-reduction. Different analytical techniques were applied to adequately characterize all as-prepared materials to determine the formation of species with the desired morphology and properties. Results revealed that the special chemical structure of MXenes could improve the dispersion of FeS nano-particles and suppress its aggregation. Meanwhile, the adsorption data closely well tailored with the Langmuir isotherm and Pseudo-second-order equation, and the maximum removal efficiencies were 88.5 and 107.2 mg/g for uranium(VI) and chromium(VI). It was also found that the presence of other cations and anions had no obvious influence on removal of U(VI)/Cr(VI), whereas the elimination process was a spontaneous endothermic reaction . More importantly, according to the spectroscopic analysis and DFT calculation , both FeS and surface functional groups on Ti 3 C 2 @FeS-PDA/PEI exhibited strong chemical affinities to the targeted pollutants, while FeS could effectively reduce Uranium(VI) to Uranium(IV) and Chromium(VI) to Chromium(III). This work facilitated the omnidirectional improvement of MXenes-based materials for the de-pollution of practical radionuclide or heavy metals wastewater.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Fang Wang,Tingting Li,Yun Liao,Liangshu Xia
With the rapid development of nuclear industry, a large amount of U(VI)-containing wastewater is inevitably generated and poses a serious threat to the environment. Hence, it is of great significance to remove U(VI) from aqueous solution. Herein, a novel magnetic absorbent (Fe 3 O 4 @DFNS-NH 2 ) with core–shell and fibrous structure for U(VI) capture was fabricated. The magnetic core can make the adsorbent separated conveniently from solution and the functional porous shell facilitates the fast capture of U(VI). Batch experiments were carried out to investigate the performance of the magnetic absorbent. The U(VI) adsorption onto Fe 3 O 4 @DFNS-NH 2 reached equilibrium within 60 min at pH 6 and the adsorption capacity reached 255.2 mg g −1 . The adsorption followed the pseudo-second order model and Langmuir isotherm model, indicating the nature of monolayer chemisorption. In addition, Fe 3 O 4 @DFNS-NH 2 exhibited good selectivity toward U(VI) in the presence of metal ions (K + , Cs + , Ca 2+ , Mg 2+ , Sr 2+ and Eu 3+ ). FT-IR and XPS analysis demonstrated that U(VI) was anchored onto Fe 3 O 4 @DFNS-NH 2 through the surface complexation with amino groups. These findings manifest that Fe 3 O 4 @DFNS-NH 2 shows great potential to remove U(VI) from nuclear wastewater.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiandi Cui,Zhiquan Yang,Xinyi Zhang,Wanhui Liu,Baosheng Zou,Wenning Liao
As an effective treatment method for uranium removal in wastewater, the application of photocatalytic reduction has attracted extensive attention. To improve the optical performance of Nb 2 O 5 , CdS nanoparticles were introduced via a one-step hydrothermal method. Then the characterization by various methods (e.g. XRD, SEM, TEM, XPS and UV–vis DRS) were used to determine the structural and optical properties of the heterojunction of Nb 2 O 5 nanorod/CdS nanoparticles (NC). It clearly confirmed that the successful construction of the heterojunction widened the visible light absorption range, narrowed bandgap (∼2.11 eV), promoted the charge transfer and enhanced the separation efficiency of photoinduced electron-hole pairs and further improved the photoreduction activity. During the photocatalytic degradation process, the results showed the photocatalyst with the Nb/Cd molar ratio of 1/3 (NC-3) displayed the best removal of U(VI), with a removal efficiency of 97% in 90 min adsorption and 150 min visible light irradiation at the pH=6. The NC-3 photocatalyst was relatively stable and exhibited good recyclability in during the cyclic experiments. In the end, it was proposed that e - and O 2 - radicals played important roles in the process of the reduction of U(VI).
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiuling Guo,Yi Shang,Xiaoliang Liang,Zenghui Diao,Gang Song,Diyun Chen,Shuao Wang,Lingjun Kong
The utilization and development of nuclear energy has resulted in the discharge of uranium-containing wastewater. Layer double hydroxides (LDHs) and oxides (LDOs) were reported for efficient extracting U(VI) from wastewater. In this work, nickel–cobalt layered double oxide (Ni-Co LDO-X, X represents the calcination temperature) with excellent electrostatic attraction and complexation was synthesized via calcination of nickel–cobalt layered double hydroxide (Ni-Co LDH) under air atmosphere for extracting U(VI) comparing to Ni-Co LDH. Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and zeta potential analysis were conducted to characterize the Ni-Co LDO-X. Batch adsorption experiments were carried out to investigate the U(VI) extraction properties. The U(VI) adsorption capacity on Ni-Co LDO-500 increased over 3 times compared to that of Ni-Co LDH. The process of uranium removed by Ni-Co LDO-500 conforms to the Langmuir model, the calculated maximum adsorption capacity is 707.91 mg/g. The results suggested that the excellent U(VI) adsorption ability on Ni-Co LDO-500 mainly dominated by the memory effect, electrostatic interaction, and complexation on the outer-sphere surface. Ni-Co LDO-500 has excellent regeneration ability in five adsorption/desorption experiments. The Ni-Co LDO-500 had favorable ability in removing uranium in actual wastewater with the residual concentration being lower than 0.05 mg/L. The above results highlight that the Ni-Co LDO-500 is promising to be used for the decontamination of uranium in actual uranium-containing wastewater.
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Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Linfa Bao,Jingjing Han,Huifang Wang,Renrong Liu,Muqing Qiu,Baowei Hu
In this study, a novel synergistic photocatalyst (Fe 3 O 4 /GO/g-C 3 N 4 composites) were constructed by chemical precipitation of Fe 3 O 4 nanoparticles on surface of GO/g-C 3 N 4 suspension. The characterization results indicated that Fe 3 O 4 /GO/g-C 3 N 4 composites exhibited high efficient separation of photogenerated electron–hole pair, narrow bandgap (∼2.38 eV) and wide absorption range. The incorporation of Fe 3 O 4 significantly increased the photocatalytic performance of GO/g-C 3 N 4 composites due to synergistic effect. More than 90% of U(VI) was photo-reduced by Fe 3 O 4 /GO/g-C 3 N 4 composites within 2 h under visible light irradiation. The trapping experiments and XPS analysis indicated that the photogenerated electrons and superoxide ( ⋅ O 2 ) radicals are responsible for U(VI) removal. These findings indicated that magnetic g-C 3 N 4 composites can be used as excellent candidates for the high efficient removal of U(VI) in actual environmental cleanup.
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