Journal of CO2 Utilization
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2022
·
IF 8.321
Nicui Yuan,Yuxin Mei,Yuwei Liu,Yating Xie,Baining Lin,Yonghua Zhou
The development of efficient and highly selective photocatalysts is a key point for the photocatalytic conversion of CO 2 . In this paper, a composite catalyst UiO-66-NH 2 /Ce(HCOO) 3 (simplified to UNH/Ce(HCOO) 3 ) was fabricated by one pot method with CeCO 3 OH as the precursor. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) characterizations results confirmed that UNH was dispersed on the surface of Ce(HCOO) 3 and strongly interacted with it via Ce-N bond. The yield of CH 4 on the optimal UNH/Ce(HCOO) 3 catalyst reached 3 times of that on pristine UNH, up to 128.81 μmol g −1 , with the CH 4 selectivity of 71.9 %, and the R electron reached 286.46 μmol g −1 h −1 . The UV–vis diffuse reflection spectra and photoelectrochemical tests results confirmed that the improved photocatalytic CO 2 reduction performance and high CH 4 selectivity could be attributed to the formation of the type-Ⅱheterojunction of UNH/Ce(HCOO) 3 with abundant Ce 3+ , which expanded the visible light absorption range, accelerated the separation and transfer rates of photogenerated charges, and thus efficiently promoted the multi-electron reduction reaction of CO 2 to CH 4 . In addition, the reaction temperature affected profoundly the cycle performance of the catalyst. The results presented here illustrated the possibility for improving the stability of UNH/Ce(HCOO) 3 -1.80 by decreasing reaction temperature.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junhui Tan,Rongxia Huang,Hua-Tay Lin,Kai Liu,Tianbao Xie,Yejing Dai
CaBi 2 Nb 2 O 9 (CBN) with the Aurivillius phase has a high Curie temperature ( T C ) and remarkable fatigue resistance , which has great potential for application as high-temperature sensors. However, due to its low piezoelectric properties , its practical application remains a great challenge. In this paper, Ca 1- x Ce x Bi 2 Nb 2 O 9 ceramics were prepared by the direct reaction sintering (DRS) and conventional preparation (CP) methods, respectively. The experimental results indicate that Ce doping can increase the piezoelectric coefficient d 33 of CBN ceramics by about two times. Among them, the grain size of the samples prepared by the DRS method is finer and more uniform, and the d 33 value of DRS samples is about 3.6–9.4 % higher than that of CP samples. The DRS sample Ca 0·97 Ce 0·03 Bi 2 Nb 2 O 9 has a d 33 value of 18.9 pC/N, a T C of 948 °C, and a resistivity of 1.1 × 10 5 Ω cm at 600 °C. This study shows that DRS method is an effective densification method, which can prepare CBN-based ceramics with excellent comprehensive properties, and provides an innovative preparation route to explore CBN-based ceramics with excellent piezoelectric properties.
研究领域:
材料科学
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无机化学
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DOI
高影响因子
FUEL
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2024
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IF 6.7
Jinrui Zhang,Tianlong Yang,Qiong Rao,Zhongrui Gai,Peng Li,Yuanhui Shen,Mingkai Liu,Ying Pan,Hongguang Jin
Chemical looping dry reforming of methane (CL-DRM) is a promising technology for production of syngas and the utilization of greenhouse gases, which highly relies on efficient oxygen carrier (OC) to facilitate the energy and material transfer. In this work, Fe 2 O 3 /CeO 2 oxygen carriers in physical and crystalline contact modes were synthesized and used for CL-DRM. The Fe 2 O 3 /CeO 2 crystal interface significantly promoted the oxygen release of both Fe 2 O 3 and CeO 2 . The completely reduced iron elements dispersed uniformly into the CeO 2 support and formed pure CeFeO 3 in the oxidation step. CeFeO 3 showed enhanced methane conversion rate (81.3 %), CO selectivity (96.6 %) and lower temperature sensitivity. The time-resolved reaction performance of Fe-Ce oxygen carriers was investigated to understand the relationship between the oxygen vacancy concentration and reactivity of Fe-Ce oxygen carrier. With the increasing concentration of oxygen vacancies, the oxygen carrier exhibited elevated activity and enhanced selectivity. The redox range of CL-DRM was then tuned to enhance the reaction conversion and product purity. In the deep reduction range of oxygen carrier, the deposited carbon also served as the active redox intermediate for chemical looping and enhanced both the reaction conversion rate and the product purity to nearly 100 %. These findings showcased rational methods for design and utilization of iron-based oxygen carriers and expanded the potential for chemical looping applications.
研究领域:
化学工程
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能源科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Ao Zhou,Wenwen Cai,Weijian Guo,Jizhen Ma,Yueqing Wang,Jintao Zhang
Designing highly effective, low-cost bifunctional electrocatalysts without noble metals for overall water splitting remains a significant challenge. In this work, interfacial coupling of Ce-doped CoSe 2 nanoneedle arrays with MXene (Ce-CoSe 2 /MXene) is developed via the facile hydrothermal and selenization methods. The extensive specific surface area and favorable hydrophilicity of Ti 3 AlC 2 , combined with the optimized electronic structure and abundant active sites from Ce-doping and selenization, contribute to the exceptional bifunctional electrocatalytic performance of the Ce-CoSe 2 /MXene electrode. Specifically, this heterostructure achieves a low hydrogen evolution reaction (HER) overpotential of 34 mV at 10 mA cm −2 , an oxygen evolution reaction (OER) overpotential of 279 mV at 100 mA cm −2 , and an overall water splitting (OWS) potential as low as 1.45 V at 10 mA cm −2 . In-situ Raman spectroscopy reveals that surface reconstruction would improve catalytic activity and stability. Theoretical calculations indicate that the Ce-CoSe 2 /MXene can improve the adsorption of intermediates and facilitate HER/OER process by lowering the kinetic barrier, thereby enhancing electrocatalytic activity. This research marks a substantial advancement in the development of low-cost, efficient electrocatalysts for overall water splitting.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2021
·Vol. 28
·期 32
·43815-43830
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IF 4.223
Liu Yaxin,Ma Yongwen,Wan Jinquan,Wang Yan,Sun Jian,Xue Yangyang
In this work, Co-Ce-Zr/γ-Al 2 O3 3 particle electrodes were prepared for the efficient degradation of ciprofloxacin (CIP). Co-Ce-Zr/γ-Al 2 O 3 particle electrodes were analyzed with a scanning electron microscope (SEM), X-Ray Diffraction (XRD), X-Ray Fluorescence Spectrometer (XRF), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDS). According to the results, significant amounts of Co 3 O 4 , CeO 2 , and ZrO 2 were formed on the Co-Ce-Zr/γ-Al 2 O 3 particle electrodes. It was shown that when the conditions of the reaction system were at pH=6, conductivity of 4 ms/cm, current of 0.2 A, initial pollutant concentration of 100 mg/L, and material dosage of 15 g, CIP could be completely degraded within 40 min, and the energy consumed in the reaction was 41.3 kWh/kg CIP. The rate of total organic carbon (TOC) removal by Co-Ce-Zr/γ-Al 2 O 3 particle electrodes was recorded to be approximately 52.6%. Using a response surface methodology, we explored the optimal operating conditions. At the same time, we also explored the influence of inorganic anions in water and actual water medium on the rate of CIP removal. In addition, the ESR data proved that the main active substance in the reaction system was ·OH. The degradation intermediates were investigated, and the possible mechanism was proposed. Thus, this research provided a new solution for the treatment of antibiotic-containing wastewater.
研究领域:
环境科学
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电化学
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废水处理
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2024
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IF 5.1
Qin Yao,Jian Zou,Jun Yang
The high solar reflectance and good colour performance are requisite for the practical application of the colour-cool pigment. In this work, Ce-doped Yb 3 Al 5 O 12 and (Y, Yb) 3 Al 5 O 12 ceramic pigments were prepared by the sol-gel method. Both Ce 3+ and Ce 4+ ions coexist in the doped pigments. Due to the 4f→5d electron transition of Ce 3+ , the Ce-doped pigments have a selective absorption at around 400–520 nm, which is responsible for the yellow hue. The content of the Ce 3+ ion determines the colour performance of the pigment. The size effect from the smaller Yb 3+ ion results in an increased content of Ce 3+ in the Ce-doped pigments, leading to an improved colour performance. The incorporation of Y 3+ ion can effectively decrease the absorption at 975 nm, thereby enhancing the solar reflectance to 80.6 %, while maintaining good colour performance (Yb 0.7 Y 2.1 Ce 0.2 Al 5 O 12 , L* = 91.40, a* = -4.89, b* = 45.33). In a simulation experiment, the ceramic glaze coating based on the prepared pigment showed a temperature reduction of 5.2 °C compared to the commercial yellow pigment ceramic coating .
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Xinyu Hu,Yao Zhang,Mingrong Lu,Min Yang,Jianmin Li,Zhengmei Wang,Guizhen Li,Hongbin Wang
In the present work, Ce-UiO-66, namely cerium-organic framework was prepared through rapid one-step solvothermal method, uncovering it potency to effectively get rid of tetracycline (TC) from an aqueous solution. The morphology and structure of Ce-UiO-66 materials were characterized by typical traditional methods such as FESEM, XRD , FTIR, and XPS. The process performance in terms of TC removal was investigated at different operating conditions. Specifically, when the dose, pH value, adsorption time, and temperature were 20 mg, 9, 180 min, and 25 ℃ respectively, the removal effect of TC was the best. The adsorption process of TC was described using the Freundlich model and the quasi second order model, respectively. The removal efficiency of TC by UiO-66 before modification was only 40.37%, and the adsorption amount was 44.38 mg⋅g −1 , while the removal efficiency of TC adsorption by Ce-UiO-66 could reach about 90% under the optimal adsorption conditions, and the maximum adsorption amount was 86.95 mg⋅g −1 . The data showed that Ce-UiO-66 exhibits good TC adsorption performance. And TC adsorption process was spontaneous and endothermic multi molecular layer chemical adsorption . Ce doping increased the quantity of active sites, and promoted the synergistic effects of electrostatic attraction, π-π conjugation, and hydrogen bonding between the adsorbent and TC, thus improving the adsorption effect of TC. As everyone knows that the application of UiO-66 in the adsorption field can be broadened by doping other metal ions , which prove that the metal skeleton adsorption material has broad development prospects in the next few years.
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
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Shuya Rui,Na Liu,Lingwei Ren,Yang Liu,Zian Liu,Binghui Wu,Hua Pan,Zhiping Ye
Traditional Mn-Ce catalysts for selective catalytic reduction (SCR) of NO with CO (CO-SCR) in iron and steel flue gases are often hindered by competitive adsorption of NO and CO, which compromises catalytic efficiency. In this study, we present a Ni-doped Mn-Ce catalyst that overcomes these challenges, achieving 96 % NO conversion, 98 % N 2 selectivity, and 44 % CO conversion at 175 °C. Comprehensive characterization of the catalyst reveals that Ni doping significantly enhances Mn-Ce interactions, boosting oxygen vacancy density and promoting efficient redox cycling between Mn 3 + /Mn 4+ and Ce 3+ /Ce 4+ . Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) confirms preferential NO adsorption at oxygen vacancy sites, minimizing CO-NO competition and stabilizing the Langmuir-Hinshelwood mechanism, where both gases co-adsorb and react at oxygen-rich vacancies. Mechanistic insights suggest that Ni facilitates electron transfer, weakening the N–O bond in NO and accelerating its dissociation, resulting in faster NO reduction. This study establishes Ni doping as a promising strategy for improving the low-temperature performance of Mn-Ce-based CO-SCR catalysts, paving the way for more efficient catalytic systems.
研究领域:
催化化学
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环境科学
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DOI
高影响因子
ANALYTICAL CHEMISTRY
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2025
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IF 6.7
Yuan Qin,Huimei Liang,Jia Wu,Zheyang Chi,Shulin Zhao,Fanggui Ye
Natural enzyme cascades, including the same and different kinds of enzymes, have been widely used in biosensing. However, it is still a challenge for nanozymes, the mimics of natural enzymes, to achieve biosensing with different types of enzyme-like activities based on cascade reactions, such as hydrolase and oxidoreductase. Considering the characteristics of the multienzyme-like activity of some nanozymes, as a proof of concept, this study demonstrates a Cu/Ce-MOF-808 nanozyme as a self-cascade catalyst with hydrolase-like and catechol oxidase-like activities. Taking organophosphorus pesticides as an example, we constructed a self-cascade catalytic reaction for the one-step colorimetric detection of isocarbophos. Specifically, the hydrolase-like activity of Cu/Ce-MOF-808 can hydrolyze isocarbophos to produce colorless isopropyl salicylate, which is further oxidized by the catechol oxidase-like activity of Cu/Ce-MOF-808 and complexed with 4-aminoantipyrine (4-AAP) to produce red quinoneimine under neutral conditions with illumination. Thus, a colorimetric strategy for sensitive isocarbophos analysis is developed, with a linear range of 0.90–400.00 μg·mL–1 and a detection limit of 0.42 μg·mL–1. This research presents a new approach to the design and synthesis of nanozymes and has great application potential in the field of nanozyme cascade biosensing.
研究领域:
生物化学
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纳米生物学
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分析化学
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Wenlong Mei,Hanhan Lu,Ru Dong,ShanShan Tang,Jinlei Xu
Tetracycline (TC) is one of the most produced and used antibiotics in the world. The accumulation and migration of TC in water bodies cause serious environmental pollution and biological health problems. In this study, three kinds of brookite TiO2 (Ce/BTN) nanophotocatalysts with different Ce doping amounts were synthesized by a one-pot hydrothermal method, which provided an effective way to solve this problem. The chemical and photoelectric properties of nanomaterials were measured by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), high-resolution transmission electron microscope (HRTEM), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and photoelectrochemical techniques. The results show that after Ce doping, the sample still maintains the brookite crystal form with high crystallinity, and the morphology does not change significantly. However, the impurity energy level can be formed after Ce doping in the brookite TiO2, which reduces the band gap and extends the range of spectral response. The photocatalytic activity of different catalysts was evaluated by degrading TC solutions under simulated visible light. Based on the free radical capture experiment, the effective active species of the catalyst to degrade tetracycline was determined, and the mechanism of photocatalyst degradation was proposed.
研究领域:
环境科学
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材料科学
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光催化技术
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产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2023
·Vol. 7
·期 4
·1027-1040
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IF 5.6
Ke Gao,Xianglei Liu,Qi Wang,Zhixing Jiang,Cheng Tian,Nan Sun,Yimin Xuan
Solar thermochemical CO2 splitting has emerged as a promising strategy for solar fuel production to alleviate climate change challenges and reduce the energy crisis. However, traditional redox materials still suffer from low CO production, poor cycle stability, high operating temperature, and large temperature swing, leading to low solar-to-fuel efficiency. Herein, Ce- and Al-doped SrMnO3 perovskites are proposed for high-performance solar thermochemical CO2 splitting within moderate temperature swing (1350/1100 °C). Sr0.6Ce0.4Mn0.8Al0.2O3 demonstrates a remarkable CO yield of 799.34 μmol g−1, which is ∼6.67 times as high as that of benchmark CeO2. Fast CO2 splitting kinetics of SCMA20 is demonstrated by the CO peak production rate enhanced by 142% compared with undoped SrMnO3. The proposed Sr0.6Ce0.4Mn0.8Al0.2O3 also exhibits excellent stability with no obvious deactivation or degradation over multiple cycles. The ultrahigh CO yield can be attributed to lower oxygen vacancy formation (3.65 eV) and migration energy (2.14 eV) as confirmed by DFT calculations, and the transformation of the first-order reaction (F1) to the second-order reaction (F2) compared to SrMnO3. This work provides a new path for high-performance solar thermochemical CO2 splitting with high CO production, fast reaction kinetics, good cycling stability, moderate temperature swing, and high solar absorptance.
研究领域:
材料科学
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能源化学
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环境科学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
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IF 6.6
Xuewen Xie,Jinbo Zhao,Shangtao Liang,Xiong He,Chenghao Yu,Ruzhen Xie,Jiale Xu,Lihui Yang,Dengmiao Cheng,Hui Lin
Herein, we reported using nontoxic Ce for co-doping to reduce the dopant amount of highly toxic Sb, resulting in a boost to the ability of SnO 2 reactive electrochemical membrane (REM) in the oxidation of refractory herbicide atrazine (ATZ). The study found that co-doping Ce causes the expansion of SnO 2 crystal and yields numerous defects on the SnO 2 crystal surface, creating more reactive sites and significantly enhancing the catalytic activity of Sb-doped SnO 2 REM. A single-pass through the Sb, Ce co-doped SnO 2 REM system could reduce ATZ in a real groundwater sample from a 10 μg·L –1 of feed concentration to steadily below the EAP regulatory maximum contaminant level of 14 nM. The addition of high concentrations of chloride and natural organic matters greatly inhibits the oxidation of ATZ, whereas solution pH and bicarbonate have less effect. Quenching experiments demonstrate that hydroxyl radical ( • OH) plays the key role in ATZ oxidation. The degradation by-products of ATZ were identified using high-resolution mass spectrometry , and possible degradation pathways, including • OH‐induced de-alkylation and • OH de-chlorination processes, were proposed based on the by-products’ concentration changes. Biological toxicity tests using freshwater green algae Chlorella vulgaris demonstrated that the toxicity of ATZ effluent was greatly eliminated.
研究领域:
环境科学
·
水处理技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）