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.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Weiqian Cai,Youqun Wang,Linshan Xiong,Yingjie Zheng,Zhibin Zhang,Xiaohong Cao,Yunhai Liu
Cuprous oxide (Cu 2 O), a promising semiconductor material, has been less employed in the photocatalytic removal of uranium. In this work, silver and gold nanoparticles were introduced on the surface of Cu 2 O. HR-TEM, XRD and XPS were applied in characterized the physic-chemical properties of composite. In comparison to Cu 2 O, Au modified Cu 2 O (Au/Cu 2 O-N) demonstrated a significantly enhanced uranium removal rate, reaching 100% within 120 minutes. This represents a 2-fold increase in the uranium removal rate compared to pure Cu 2 O-N. The reason con be interpreted including the red-shift of the absorption band from 600nm-800nm, the formation of Schottky junction between Au and Cu 2 O, the electron traps constructed by Au itself. Consequently, the rate of photogenerated electron-hole complexation is significantly diminished. Free trapping and EPR prove that reactive radicals are O 2 - . This has led to the development of a novel approach, namely the synergistic strategy of noble metal loading and nitrogen-doped cuprous oxide, which has the potential to facilitate the visible light removal of U(VI) from toxic wastewater.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yachao Xu,Xue Han,Zhong Zhou,Peng Yu,Bojing Sun,Ying Wang
Designing an efficient reduction of soluble U(VI) to insoluble U(IV) is a challenge, and efficient electron-hole transfer efficiency is the key to the conversion of U(VI) to U(IV). Herein, defective transition metal sulfide (O v -ZAF) Z-Scheme tandem heterojunctions with spatial separation were synthesized using an in situ self-assembly method. O v -ZAF has excellent electron-hole separation, stabilized reactive active sites, and excellent visible light absorption. O v -ZAF is able to realize the photocatalytic U(VI) reduction reaction (URR) and water oxidation reaction (WOR) synergistically. The results showed that O v -ZAF was able to reduce 498.3 mg/g of U(VI) in 100 ppm uranium solution for 200 min, with a reduction efficiency of 99.8 %. O v -ZAF showed excellent reduction ability in a variety of uranium-containing waste solutions as well as in real seawater. In addition, O v -ZAF is capable of generating reactive oxygen radials (ROS) and has excellent antimicrobial activity against Escherichia coli, Staphylococcus aureus and Pseudoalteromonas xiamen . Oxygen vacancies and tandem components can tune both occupied and unoccupied orbitals near the Fermi level of O v -ZAF. This work provides a possibility of efficient uranium reduction engineering through tunable compositions and electronic structures.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yachao Xu,Zhong Zhou,Peng Yu,Huiquan Gu,Zixu Zhang,Ying Wang
Efficient reduction of U(VI) to U(IV) during seawater uranium extraction remains a challenge. Here, cerium dioxide quantum dots were bonded to the surface of indium zinc sulfide (ZIS) to form ZIS composite cerium dioxide quantum dots (ZIS/QDs-Ce). The oxygen vacancies are able to activate the Zn-O bonds at the ZIS and QDs-Ce interfaces, thus enabling the constructed S-scheme heterojunction to show great potential in facilitating the separation and transfer of photogenerated carriers. ZIS/QDs-Ce exhibited high anti-bio-pollution activity by generating biotoxic free radical reactive oxygen species (ROS). The photo-induced reduction of uranium by ZIS/QDs-Ce in 10 ppm uranium spiked simulated seawater reached 99.6 %. Oxygen vacancies cause distortions in the crystal field, and the Zn-O bond activation process triggers the movement of ZIS/QDs-Ce from the singlet low-spin state to the stable triplet state, resulting in free-carrier trapping centers and optimized electronic energy band structures. ZIS/QD-Ce has superior uranium extraction capabilities and is highly recommended for uranium extraction from seawater.
研究领域:
材料科学
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环境科学
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核能工程
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Yachao Xu,Hongsen Zhang,Qi Liu,Jingyuan Liu,Rongrong Chen,Jing Yu,Jiahui Zhu,Rumin Li,Jun Wang
It is still a challenge to obtain uranium (U) adsorbents with high selectivity , excellent cycle stability and excellent performance through design and synthesis. In this paper, the TiO 2 /CPAN-AO catalyst was prepared by the hydrothermal method combined with high temperature cyclization dehydrogenation . TiO 2 /CPAN-AO has excellent photocatalytic properties, which can reduce U(VI) to U(IV) quickly and selectively. The generated Z-type heterojunction promotes the reduction ability of photogenerated electrons, and obtains great selectivity to UO 2 2+ (Uranyl ions) through the AO group. TiO 2 /CPAN-AO with π-electron conjugated structure broadens the spectral range through surface hybridization and prolongs the lifetime of photo-generated charges. Under the induction of light, the uranium extraction capacity of TiO 2 /CPAN-AO after 5 h of irradiation is about 2.38 g/g. TiO 2 /CPAN-AO is a catalyst with enhanced adsorption capacity, making it possible to extract uranium from large-scale natural seawater in the future.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Xinyi Zhang,Yinxiang Chen,Rongshuo Guo,Zhijun Zhang,Zhe Sun,Ye Zhang,Feng Yan
Ionic liquids (ILs) have emerged as new persistent pollutants in aquatic environments due to their notable ecotoxicity. Herein, In 2 Se 3 @Ag 3 PO 4 S-scheme piezo-photocatalyst with interfacial In-O and Se-P covalent bonds is prepared for efficient degradation of 1-butyl-2,3-dimethylimidazole bromide ([BMMIm]Br). The experimental results demonstrate that 98.3 % of [BMMIm]Br is degraded under piezo-photocatalysis. Notably, [BMMIm]Br functions as a hole sacrificial agent, leading to a simultaneous H 2 production rate of 582.7 μmol g −1 h −1 and a co-removal efficiency of 97.2 % for radioactive heavy metal ions of U(VI), achieving the "three birds with one stone" effect. Density functional theory (DFT) calculations indicate that the S-scheme structure, combined with the In-O and Se-P covalent bonds and the piezoelectric effect, effectively promotes the separation of electron/hole pairs while inhibiting carrier recombination dynamics, thereby enhancing piezo-photocatalytic performance. Moreover, systemic toxicity evaluations, including assessments of calculated toxicity, zebrafish growth, and bean sprout development, were conducted to verify the reduced toxicity of the degraded intermediates, highlighting the potential practical applications of this approach.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2025
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IF 1.6
Zhu Ye’an,Qiu Jialin,Zhang Zimeng,Nie Yidan,Wang Bo,Peng Li,Song Zengkai,Xie Zongbo,Le Zhanggao
The photocatalytic conversion of U(VI) to a lower oxidation state is essential in environmental cleanup, with g-C 3 N 4 being a leading photocatalyst candidate. However, the application of conventional bulk g-C 3 N 4 is limited by its low specific surface area, high rates of photogenerated carrier recombination, and limited utilization of visible light. This study presents a novel synthetic approach, termed “thermal polymerization-acidification-annealing,” that uses urea to prepare modified g-C 3 N 4 samples. Notably, the CN-3 sample has a coral-like porous structure, which significantly increases its specific surface area and reduces the bandgap, thereby improving its photocatalytic performance. Under 100 min of visible light irradiation, the CN-3 sample achieved a 95.5% reduction of U(VI) in solution, which is 2.5 times more efficient than conventional g-C 3 N 4 . The material also demonstrated excellent stability and reusability, maintaining nearly 90% reduction in U(VI) after five consecutive photocatalytic cycles. These results highlight the importance of morphological engineering for enhancing the photocatalytic performance of g-C 3 N 4 and provide a viable strategy for developing efficient and durable materials for environmental and energy applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Ruoxuan Guo,Yingzhong Huo,Liping Song,Yang Liu,Tao Wen,Sai Zhang,Yuejie Ai
Developing stable and efficient catalysts for artificial photoreduction of soluble hexavalent uranium (U(VI)) into less mobile complexes is of considerable value to U enrichment and environmental sustainability. However, the pursuit of high-performance U(VI) photoreduction is greatly plagued by inferior charge separation and utilization for semiconductors. Herein, the multipolar donor-acceptor (D-A) interface and hydroxyl groups are rationally integrated into covalent triazine frameworks (CTFs) for enhancing U(VI) photoreduction without sacrificial agents. Once incorporating phenolic hydroxyl (Ph-OH) groups as electron donors, the targeted CTF-HUST-OH displays high efficiency (∼100 %) for U(VI) removal with a brilliant enrichment capacity (681.15 mg·g −1 ) under visible light irradiation, superior to most reported metal-free catalysts. Experimental and density functional theory (DFT) results validate that the polarized internal micro-electric field is formed in CTF-HUST-OH with an oriented charge transfer from Ph-OH to triazine units, thus achieving efficient electron separation and utilization. Impressively, the introduced -OH groups promote U(VI) adsorption via increase of pore hydrophilicity, and create reaction sites towards H 2 O 2 production, thereby facilitating in-situ generation of UO 2 O 2 ·4H 2 O(s). This study highlights a new strategy on the molecular-level design of D-A type CTF photocatalysts for efficient uranyl removal and extraction from uranium-bearing aqueous environments.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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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.
研究领域:
材料科学
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环境科学
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核能技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Weidi Qin,Yang Xiao,Chunlei Zhang,Haiyi Gong,Qingsong Zhang,Qingyi Zeng
Photocatalytic hydrogen production and uranium reduction can solve the problems of energy crisis and environmental pollution. Here, bismuth nanocluster loaded on N-doped porous carbon (Bi 0 /NC) with “memory catalysis” effect was prepared through a Bi-MOF precursor pyrolysis strategy for H 2 generation and UO 2 2+ reduction. The photocatalyst achieved an enhanced H 2 production rate of 12.8 mmol g −1 h −1 and an improved UO 2 2+ removal ratio of 95.9 %, which was 3.2 and 1.8 times as pristine carbon material, respectively. Moreover, both the H 2 generation and UO 2 2+ reduction showed a sustained activity under dark condition. Improved activity is ascribed to the optimized electronic property and the enhanced charge separation in Bi 0 /NC, which can be proved by the DFT calculation of projected density of state, Fermi level and charge density difference. This work provides a new strategy to realize the continuous H 2 generation and U(VI) reduction in day and night.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yachao Xu,Qi Liu,Jiahui Zhu,Hongsen Zhang,Jingyuan Liu,Rongrong Chen,Jing Yu,Ying Li,Jun Wang
Designing a material that efficiently extracts uranium (U) from natural seawater and resists biofouling remains a critical challenge. Here, flake Znln 2 S 4 grew in situ on the surface of black porous zinc oxide (B-ZnO), and finally a binary composite material (B-ZnO/ZnIn 2 S 4 ) is synthesized. Based on the reduction process of U(VI), the chemical reaction of the U(VI) → U(IV) process occurred on the surface and interface of the composite material. The S-scheme heterojunction system constructed of ZnO and Znln 2 S 4 with a matching band structure showed great potential for promoting the separation and transfer of photogenerated carriers and obtaining powerful photoredox capabilities. By generating biologically toxic free radical reactive oxygen species and Zn 2+ , the adsorbent had high antibiological fouling activity. After 120 min of extraction in simulated seawater, the light-induced reduction ability of B-ZnO/ZnIn 2 S 4 -45% (mass ratio) on U(VI) reached 99%, which was 6.2 times higher than that under dark conditions. The conversion path of U(VI) was calculated by density functional theory (DFT). In addition, ZnIn 2 S 4 (0 0 7) exhibited the ability to localize to the surface of ZnO (0 0 2) and promote electron transfer. These results indicate that interface atomic structure engineering is crucial for the synthesis of efficient and durable seawater U(VI) extraction catalysts.
研究领域:
材料科学
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环境科学
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理论化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
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2024
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IF 4.3
Jiaxin Hu,Juan Zhang,Jinming Chang,Yunwen Liao,Hejun Gao,Hongquan Fu
Photocatalytic reduction of uranium from U(VI) to U(IV) has been recognized as an effective treatment method for uranium wastewater. However, most photocatalysts have to be reduced under inert gas and sacrificial agent. Here, a class of nitrogen-rich core–shell photocatalysts (CdS@MC) with high stability was successfully prepared by modifying CdS with melamine and cyanuric chloride condensation. When the initial concentration of U(VI) was 100 mg/L and the solid–liquid ratio was 0.2 g/L, the removal of U(VI) by CdS@MC without sacrificial agent under air could reached 95%. The removal rate was still above 80% after five cycles with good stability and good removal rate of U(VI) at high salt concentration. CdS@MC not only efficiently generates electrons for photocatalytic reduction of U(VI), but also generates H2O2 from O2, which then reacts with uranyl ions to produce metastudtite. This study provides a new direction for the study of efficient uranium removal photocatalysts without sacrificial agent in air environment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）