CERAMICS INTERNATIONAL
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2022
·Vol. 49
·期 4
·6100-6112
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IF 5.532
Yu Xia,Jianwei Man,Xiaodong Wu,Shuntian Huang,Anqi Lu,Xiaodong Shen,Sheng Cui,Xiangbao Chen,Gengtao Fu
The development of efficient photocatalysts with high activity and high selectivity remains the biggest challenge limiting the development of photocatalysis . Herein, a novel Ce-doped TiO 2 aerogel (Ce–TiO 2 ) is synthesized via a simple one-step sol-gel technique, which integrates simultaneously supercritical drying, heat treatment, nano structuring, and self-diffusion for the formation of the Ce embedded in porous TiO 2 matrix with strong coupling. The Ce–TiO 2 aerogel exhibits typically homogeneous structures, and the resulting Ce–TiO 2 aerogel shows an extremely large BET specific surface area of 246.53 m 2 /g, which is responsible for the much-enhanced photocatalytic active sites. The incorporation of Ce has induced an impurity level in the band gap of the pristine TiO 2 aerogel, extending the light response range to the visible region. Meanwhile, the structural and compositional advantages are exploited to achieve fast separation and transfer of charge carriers. The yields of CH 4 and CO are 0.6 and 2.1 μmol/(g·h) under visible light without any additional co-catalysts or sacrificial agents, which are 1.4 and 15.6 times as high as those of pristine TiO 2 aerogel. In addition, the yields of CH 4 and CO are as high as 10.3 and 26.9 μmol/(g·h) under simulated solar spectrum conditions, which are 34.3 and 1.6 times as high as those of pristine TiO 2 aerogel. The density function theory (DFT) calculation confirms that the resulting Ce–TiO 2 aerogel enables efficient H 2 O and CO 2 adsorption and activation through the Ce cooperation and O vacancy, which greatly improves photocatalytic CO 2 reduction. This work reveals the development of aerogel photocatalyst for the photoreduction of CO 2 with H 2 O and CO 2 as feedstock .
研究领域:
材料科学
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光催化
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环境工程
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纳米技术
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能量转换
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
·
IF 21.1
Jie Yang,Yu Luo,Zhichao Chen,Junjiang Zhu
The selective catalytic reduction of NO with NH 3 (NH 3 −SCR) reaction is governed by the interplay of surface acidity and redox activity, yet the mechanism of their cooperation remains elusive. Herein, Ce–O–W linkages were constructed on Ce/ZrO 2 to couple Ce 4+ /Ce 3+ redox cycle with tungsten-derived acidity. Operando DRIFTS and transient experiments revealed that gaseous NO reacts directly with NH 3 adsorbed on Lewis Ce 4+ sites, following an Eley–Rideal pathway. Brønsted acid sites from Ce–O–W acted as NH 4 + reservoirs, dynamically replenishing Lewis-bound NH 3 and sustaining continuous reactivity. Operando UV–vis spectroscopy confirmed that NO + NH 3 exposure reduced Ce 4+ to Ce 3+ , while O 2 re-oxidized Ce 3+ to Ce 4+ , establishing the redox cycle. Density functional theory calculations supported that NH 3 dehydrogenation on Ce sites and subsequent coupling with gaseous NO were energetically favorable, while O 2 -assisted Ce 3+ re-oxidation required the highest energy barrier. These results highlight the cooperative function of Ce–O–W acid–redox site in promoting SCR activity through dynamic L–NH 3 /B–NH 4 + interplay and sustained Ce redox cycling.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Long Li,Huyin Su,Licheng Zhou,Zhixiang Hu,Tiankun Li,Bingbing Chen,Hua-Yao Li,Huan Liu
Metal sulfide-based gas sensors have the advantage of high sensitivity at room temperature, enabling high integration and low power consumption. However, a trade-off between low baseline resistance and good long-term stability at room temperature still needs to be addressed. Therefore, a single-atom Ce-targeted regulation strategy for p-SnS/n-SnS 2 was proposed. By doping different amounts of Ce, the amount and size of SnS quantum dots on the surface of SnS 2 can be regulated. Furthermore, Sn-S-Ce bonds are formed by combining single-atom Ce with SnS, which effectively hinders the growth and oxidation of SnS quantum dots, as evidenced by STEM, XPS, DFT, FTIR and EAXFS methods. Due to the unique energy band structure of p-SnS and n-SnS 2 , Ce-doped SnS quantum dots serve as electronic sensitizers, effectively increasing the carrier concentration in SnS 2 . The optimal gas sensor based on the 1% Ce-doped SnS/SnS 2 composites enables high sensitivity (with a response of 22.1 to 1 ppm NO 2 ), ultralow detection limit (1 ppb), excellent long-term stability at room temperature, and a lower baseline resistance. This engineering strategy of metal sulfide semiconductor heterostructures through single-atom targeted regulation provides new insights for further optimizing the composite system.
研究领域:
材料科学
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半导体物理
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传感技术
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纳米材料
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表面化学
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环境监测
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 4
·239
·
IF 5.4
Li Guangyan,Cheng Xiu,Zhu Minnan,Tian Yayang,Chen Linfeng
To address the need for rapid detection of profenofos (PFF) residues, we developed a self-cascaded colorimetric sensor using the bifunctional nanozyme Ce-UiO-66@His, prepared by doping histidine (His) into Ce-UiO-66. The introduction of His optimized the valence state distribution of cerium and increased the concentration of oxygen vacancies, thereby endowing Ce-UiO-66@His with enhanced phosphatase-like and laccase-like activities. Crucially, these two enzymes can efficiently catalyze in sequence under the same catalytic conditions, thereby achieving an integrated self-cascaded catalytic reaction of PFF. Specifically, the phosphatase-like activity hydrolyzes PFF to generate 4-bromo-2-chlorophenol, which is then oxidized by the laccase-like activity and coupled with 4-aminoantipyrine to form a red quinone-imine dye with strong absorbance. This self-cascaded, dual-recognition system provides exceptional selectivity and high sensitivity for PFF, with a detection limit of 0.71 µg/mL. Furthermore, by integrating smartphones and RGB recognition, a portable photo-colorimetric method was developed that realizes rapid and visual quantification of PFF. This work not only presents a new strategy for rapid monitoring of PFF residues but also offers insights into designing efficient biomimetic self-cascaded sensing systems. Graphical abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Kun Lang,Yuanyingxue Gao,Panzhe Qiao,Mingyang Liu,Xiaoxin Zou,Huiyuan Meng,Wei Wu,Baojiang Jiang
Precise Ce doping stabilizes LaMnO 3 nanoperovskites during high-temperature calcination. • Ce-induced V O pinning suppresses coarsening and builds a Mn 3+ –O–Mn 3+ /V O network. • LCMO achieves 9623 μg h −1 cm −2 NH 3 yield and 96.4% FE in a flow cell. • Low-cost LCMO scales to 78 g and converts municipal wastewater to ammonium fertilizer. Precise control of the geometry and electronic states of high-temperature perovskites is crucial for efficient electrocatalytic nitrite reduction (NO 2 RR) to remove NO 2 − pollutants and enable green ammonia synthesis. In this work, an A-site Ce substitution strategy is established to steer high-temperature crystallization through (V O ) pinning, enabling defect–lattice co-programming of Ce–LaMnO 3 (LCMO) with a nanoscale Mn 3+ -rich active network. Importantly, a synthesis-to-reactivity mechanism is elucidated for high-temperature perovskite NO 2 RR catalysts, where V O pinning suppresses sintering-driven agglomeration while concurrent e g state activation mitigates electronically sluggish Mn sites. Density functional theory further shows that the formation of Mn 3+ −O−Mn 3+ network in conjunction with V O lowers the free-energy demand of key hydrogenation steps and accelerates NO 2 RR kinetics. In the flow cell, the optimized LCMO catalyst delivers an ammonia yield rate of 9623 μg h −1 cm −2 with Faradaic efficiency of 96.4%, ranking it among the most efficient catalysts reported for NO 2 RR. Notably, LCMO is scalable to 78 g per batch without detectable structural change and at a low estimated cost of ca. 1.5 USD g −1 , highlighting its industrial relevance. In a solar-powered system, it directly converts real municipal wastewater into ammonium fertilizer with an (NH 4 ) 2 SO 4 concentration of 1.8 g L −1 , establishing a scalable, solar-driven wastewater-to-fertilizer route for practical green ammonia stabilization. Download: Download high-res image (193KB) Download: Download full-size image Trace A site Ce in LaMnO 3 pins oxygen vacancies, blocks interparticle mass exchange, and locks smaller Mn 3+ -rich perovskite nanoparticles with a Mn 3+ –O–Mn 3+ /V O network that lowers NO 2 RR hydrogenation barriers. LCMO delivers 9623 μg h −1 cm −2 NH 3 at 96.4% FE at −0.8 V vs. RHE and in a flow converts wastewater into crystalline NH 4 F and (NH 4 ) 2 SO 4 .
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
·
IF 9.1
Ao Sun,Mingliang Sun,Sen Yang,Tianyi Yang,Hongwei Zhu,Erhan Qin,Cong Wang,Xin Li,Yan Xing
Ce-doped Bi 7 O 9 I 3 /TiO 2 S-scheme heterojunction was constructed for PNRR. • Ce doping modulates the Fermi level and strengthens the built-in electric field. • The enhanced BIEF promotes directional charge transfer across the heterojunction. • Strengthened charge separation improves photocatalytic N 2 fixation performance. • N 2 reduction proceeds via an associative distal reaction pathway. Photocatalytic nitrogen fixation offers a sustainable route for ammonia synthesis under ambient conditions, but its practical application is severely limited by inefficient charge separation and sluggish interfacial charge-transfer kinetics. Herein, we develop a Ce-doped Bi 7 O 9 I 3 /TiO 2 S-scheme heterojunction through dopant-mediated Fermi level engineering to strengthen the interfacial built-in electric field (BIEF) and enhance photocatalytic nitrogen fixation. The charge transfer behavior and N 2 reduction mechanism was investigated using photoelectrochemical measurements, Kelvin probe force microscopy (KPFM), ultraviolet photoelectron spectroscopy (UPS), theoretical calculations, and in situ FT-IR spectroscopy. Ce doping shifts the Fermi level of Bi 7 O 9 I 3 upward, thereby enlarging the Fermi level difference between Bi 7 O 9 I 3 and TiO 2 and strengthening the interfacial BIEF. The enhanced BIEF promotes directional interfacial charge transfer and suppresses photogenerated carrier recombination, leading to improved charge separation. Consequently, the optimized photocatalyst achieves an NH 3 production rate of 53.70 μmol g −1 h −1 in pure water, which is 8.21- and 3.76-fold higher than those of pristine Bi 7 O 9 I 3 and the undoped Bi 7 O 9 I 3 /TiO 2 heterojunction, respectively. In situ FT-IR spectroscopy and theoretical calculations indicate that the photocatalytic nitrogen reduction proceeds through an associative distal pathway. This work demonstrates that dopant-induced Fermi level engineering can effectively regulate interfacial electric fields and charge transfer behavior in S-scheme heterojunctions, providing a rational strategy for BIEF engineering in efficient photocatalytic nitrogen fixation. Download: Download high-res image (166KB) Download: Download full-size image
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Wenjie Liao,Ling Zhou,Xiaoqiang Wang,Yue Liu,Zhongbiao Wu
Both improving the activity and reducing SO3 emissions during selective catalytic reduction of NOx by the NH3 (NH3–SCR) process over commercial V–Ti-based catalysts remain a challenge. Herein, Ce and P cooperatively modified the VMo/Ti catalyst to address this challenge. Within the temperature range of 250–350 °C, the optimal VMoCeP/Ti catalyst achieved a NO conversion of more than 95% and maintained a SO2 oxidation ratio below 1.0%. The enhanced SCR activity of the modified catalyst could be attributed to the improvement in surface acidity and redox capacity by the addition of Ce and P, which would promote NH3 adsorption and activation. Meanwhile, Ce and P coaddition could regulate the surface structure of vanadyl species from predominantly polymeric to a more dimeric form, which could also promote the SCR reaction. More importantly, except for the suppressed sulfation of vanadium species, both a lower proportion of polymeric vanadyl species and the strong interactions among V–Ce–P species could raise the energy barrier of the decomposition of sulfated vanadium species into SO3, thereby inhibiting SO2 oxidation. This work provided novel insights into developing efficient SCR catalysts with low SO2 oxidation ratios for both the academic and industrial fields.
研究领域:
催化化学
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环境化学
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材料科学
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化学工程
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Analytical Methods
·
2023
·Vol. 15
·期 24
·2964-2970
·
IF 3.1
Shaoyan Zhang,Jinfeng Ning,Qingqing Wang,Wei Wang
Flavonoids are widely used in the treatment of various diseases due to their antioxidant, anti-inflammatory, anticancer and antiviral properties. Fluorescence detection is rarely applied for the determination of flavonoids because of their weak fluorescence. In this work, a method of fluorescence enhancement of flavonoids was firstly introduced by using sodium acetate for flavonoid derivatization. The study discovered that flavonoids, with a hydroxyl at the C3 position, had the ability to emit strong fluorescence after derivatization. Five flavonoids, kaempferide, galangin, isorhamnetin, kaempferol and quercetin, having a special structure, were selected, derivatized and analyzed by capillary electrophoresis with laser-induced fluorescence detection. Under the optimal conditions, the five flavonoids could be completely separated within 3 minutes. Good linear relationships were obtained for all analytes and the limits of detection for the five flavonoids were in the range of 1.18–4.67 × 10−7 mol L−1. Finally, the method was applied to the determination of flavonoids in five traditional Chinese medicines: aster, chamomile, galangal, tangerine peel and cacumen biotae. Flavonoids were successfully found in all these medicines by the developed method. The recoveries were in the range of 84.2–111%. The method developed in this study was fast, sensitive and reliable for the determination of flavonoids.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yukun Li,Yongfu Liu,Zhaohua Luo,Zehua Liu,Svenja Hanson,Chengheng Pang,Hui Lin,Haiming Qin,Jun Jiang
Ce/Mn/Cr: Y 3 Al 5 O 12 transparent ceramics with a pure garnet structure and a high color rendering index were prepared by a solid-state reaction method. Mn 2+ and Cr 3+ enhance the emission between 500 and 700 nm and expand the conventional Ce: YAG phosphors spectrum. The Ce 3+ can work both, as activators and sensitizers, and the intense energy transfer from Ce 3+ to Mn 2+ /Cr 3+ is realized through the non-radiative and radiative processes. In the sample with the optimized doping concentration the high color rendering index (CRI) value of 75.3 can be achieved under a 450 nm laser diode excitation. The chromaticity coordinates can be tuned from (0.3125, 0.3232) to (0.2917,0.2851) by varying the doping concentration. With the increasing Mn 2+ /Cr 3+ doping concentration, the lifetime of Ce 3+ , quantum efficiency and luminous efficiency are all gradually decreased. This work effectively offers a scheme for realizing the high color rendering performance of phosphor-converted transparent ceramics in white LEDs/LDs.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Shuang Wei,Hao Li,Kexin Li,Ruirui Zhang,Guosheng Wang,Ruixia Liu
We report the fabrication of Ce–Fe oxides (CFOs) derived from Prussian blue analogues (PBAs) with different shapes of sphere (CFO-S), bipyramid (CFO-B), and flower (CFO-F), which are prepared by controlling the volume ratio of water and ethanol and the addition of deep eutectic solvents (DESs) to control the solvent environment using a modified coprecipitation method. The structure, morphology, and the surface properties of Ce–Fe oxides were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The catalytic performance of PBA-derived Ce–Fe oxides was evaluated for the oxidation of cyclohexane, which positively correlated with surface oxygen vacancy and the amount ratio of Ce/Fe. The conversion for cyclohexane of CFO-S and CFO-B was 9.03 and 9.25%, respectively. However, CFO-S had a higher selectivity for K/A-oil (cyclohexanone and cyclohexanol) of 81.8%, resulting from the exposed crystal plane (100) compared to CFO-B (75%). Besides, CFO-F was rich in the Fe2O3 crystal phase, which is beneficial for KA selectivity. It was found that Ce3+, Fe3+, and OV had an important influence on the activation of C–H bonds, which provides a reference for the design of efficient alkane oxidation catalysts.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Zhen Pu,Jianwei Qin,Xiaoguo Fu,Ruizhi Qiu,Bin Su,Maobing Shuai,Fang Li
Fundamental investigation of metal–CO interactions is of great importance for the development of high-performance catalysts to CO activation. Herein, a series of side-on bonded mononuclear lanthanide (Ln) oxocarbonyl complexes OLn(η2-CO) (Ln = La, Ce, Pr, and Nd) have been prepared and identified in solid argon matrices. The complexes exhibit uncommonly low C–O stretching bands near 1630 cm–1, indicating remarkable C–O bond activation in these Ln analogues. The η2-CO ligand in OLn(η2-CO) can be claimed as an anion on the basis of the experimental observations and quantum chemistry investigations, although the CO anion is commonly considered to be unstable with electron auto-detachment. The CO activation in OLn(η2-CO) is attributed to the photoinduced intramolecular charge transfer from LnO to CO rather than the generally accepted metal → CO π back-donation, which conforms to the traditional Dewar–Chatt–Duncanson motif. Energy decomposition analysis combined with natural orbitals for chemical valence calculations demonstrates that the bonding between LnO and η2-CO arises from the combination of dominant ionic forces (>76%) and normal Lewis “acid–base” interactions. The fundamental findings provide guidelines for the catalyst design of CO activation.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Dongsheng Luo,Hongfei Yin,Jingxin Li,Binqiang Tian,Huaiqi Li,Yaoguang Li,Chunguang Li,Yuehua Zhang,Mengqi Chen,Yanqiu Jing
Nowadays, researchers make great effects to eliminate some harmful chemicals produced by tobacco. Photocatalysis is one of the most advanced techniques and can degrade organic contaminants effectively. In this paper, a novel CoS@ZnIn 2 S 4 -Ce heterostructured cage was successfully prepared for degradation. After various characterizations, CoS@ZnIn 2 S 4 -Ce exhibited a significant separation of the photo-generated electrons and holes and could degrade phenol effectively no matter under UV light (98.46 %) or visible light (96.72 %). Furthermore, CoS@ZnIn 2 S 4 -Ce could degrade nicotine (91.62 %), benzopyrene (84.65 %) and nitrosamine (99.18 %) effectively under visible light. The effects of the initial conditions on degradation of phenol was also well investigated. The optimal conditions were 0.5 g/L of catalyst dosage, 4.35–7.00 of pH value and 10 mg/L of phenol initial concentration. OH and O 2 − were the main active radicals during the photo-degradation process. On this basis, a possible photocatalytic degradation pathway for degradation of contaminants produced by tobacco are proposed.
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