JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Jiaqi Wang,Yuqing Zhang,Ying Wang,Shuai Sun
To efficiently clean oily wastewater with the linear anion polyacrylamide (APAM), selective adsorption strategy belonging to phase equilibrium separation is introduced into the membrane separation . Herein, bimetallic Ce-UiO-66-NH 2 /diatomite (CUD) were first synthesized by a one-step hydrothermal method and then employed as a functional layer to form CUD self-assembled membrane (CSA-membrane). CUD particles were characterized by FT-IR, XRD and SEM, and CSA-membrane was observed by SEM. The separation and the selective adsorption properties of CSA-membrane formed under the optimum conditions for APAM in oily wastewater were investigated. The results demonstrate that the size of CUD particles with proper sphericity is mainly 20 μm. Furthermore, CSA-membrane simultaneously exhibits fascinating separation and selective adsorption properties for cleaning oily wastewater, namely the concentration of oil decreases from 78.1 mg L -1 to 6.8 mg L -1 , and flux of CSA-membrane reaches 789.5 L m -2 h -1 . Remarkably, the adsorption capacity of CSA-membrane for APAM is 161.5 mg g -1 , while showing the APAM removal rate of 51.3%. Therefore, CSA-membrane with the synergetic effect of phase equilibrium and rate separation is promising alternative for cleaning oily wastewater with APAM.
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高影响因子
TALANTA
·
2021
·
IF 6.057
Azhar Irfan,Wenxia Feng,Kexin Liu,Khan Habib,Qishu Qu,Li Yang
As an important post-translational modification of proteins, phosphorylation plays a key role in regulating a variety of complicated biological reactions. Owing to the fact that phosphopeptides are low abundant and the ionization efficiency could be suppressed in mass spectroscopic detection, highly efficient and selective enrichment methods are essential to identify protein phosphorylation by mass spectrometry. Here, we develop novel titanium oxide coated core shell mesoporous silica (CSMS@TiO 2 ) nanocomposites for enrichment of phosphopeptides with simultaneous exclusion of massive proteins. The CSMS@TiO 2 nanocomposites have essential features, including uniform 1.0 μm diameter, 120 nm thick shell, 7.0 nm mesopores perpendicular to the surface, large surface area of 77 m 2 /g and pore volume of 0.15 cm 3 /g, therefore can greatly improve the sensitivity for identifying phosphopeptides by capillary electrophoresis-mass spectrometry. The proposed CSMS@TiO 2 nanocomposites are applied for analysis of β-casein tryptic digest and bovine serum albumin (BSA) protein mixture, respectively. The results show that the number of phosphopeptides detected is tremendously increased by using CSMS@TiO 2 nanocomposite, proving selectively enriching phosphopeptides due to the size-exclusive and specific interaction of the TiO 2 -modified mesopores. The enrichment of the phosphopeptides is achieved even for the digests at very low concentration of β-casein (1 fmol/μL). This research would open up a promising idea to utilize mesoporous materials in peptidomics analysis.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Lulu Wang,Beiyue Ma,Xinming Ren,Chao Yu,Chengji Deng,Chunming Liu,Chuanbo Hu
In an attempt to enhance the sintering and mechanical performance of porous cordierite ceramics (Mg 2 Al 4 Si 5 O 18 ) as support materials for vehicle exhaust catalysts, ZrO 2 and M x O y (M = La, Ce, and Nb) were simultaneously introduced into cordierite sintered at 1350 °C for 4 h. Then, the reinforced function of ZrO 2 and M x O y on the properties of porous cordierite ceramics was systematically evaluated, especially for the sample co-doped with ZrO 2 and La 2 O 3 . The results displayed a distinct enhancement in mechanical and thermal performance, and the cold compressive strength increased from 72.74 to 158.59 MPa as well as thermal conductivity ranged from 1.66 to 2.01 W m −1 K −1 , respectively. It is found that ZrO 2 facilitated activation sintering introduced via lattice distortion in cordierite and La 2 O 3 accelerated the formation of cordierite and ZrSiO 4 microcrystalline through the low-temperature liquid phase. The synergic effect between ZrO 2 and La 2 O 3 , therefore, had a significant role in the reinforced mechanical and thermal performance of porous cordierite ceramics. This work not only offers a feasible strengthening strategy, but also expands the possibilities for building high-performance structural and functional ceramics .
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JACS Au
·
2025
·
IF 8.7
Jin Zhang,Hongyu Lin,Xiaoqin Zhang,Mingli Fu,Daiqi Ye
The replacement of a noble metal catalyst by base metals presents a great challenge for low-temperature CO and volatile organic compounds oxidation. Cu/Ce-based catalysts are expected to achieve this goal with excellent performance, among which the main active sites still need to be further explored. For this reason, CuCe catalysts were further compounded with typical elements (cobalt, Co) to study the main active sites and compositing effect by in-situ enhanced Raman and in-situ ultralow-temperature DRIFTS technologies. The main active site for both CuCe and CuCoCe catalysts was the same Cu–OV–Ce at the copper–cerium interface, named as asymmetric oxygen vacancy (ASOv). The dispersion of CuO and CeO2 species was promoted, and the formation energy of ASOv was decreased significantly from 1.502 to 0.854 eV after the addition of Co, which leads to an increase in the ASOv concentration. A small cobalt added can form more Co2+ species, improving the activity and stability. The activity of Cu1Co0.5Ce3 catalyst was significantly improved with 100% conversion of CO and toluene at 96 and 227 °C. Here, the ASOv was studied in relative quantification, showing consistency of catalytic activity and ASOv concentration. Meanwhile, the dynamic exchange of ASOv in the reactions was tracked, indicating that the redox equilibrium of ASOv can continuously produce new ASOV in Cu/Ce-based catalysts that cause long-term catalytic stability. In addition, it is almost difficult for CoCe and CoCu samples to form the ASOv, and the interaction between metals and metals was also weaker than that of CuCe and CuCoCe catalysts.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 17
·17373-17382
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IF 2.914
Liu Xuewei,Gao Minling,Qiu Weiwen,Khan Zulqarnain Haider,Liu Nengbin,Lin Lina,Song Zhengguo
In this study, a novel Fe–Mn–Ce oxide-modified biochar composite (FMCBC) was synthesized via pyrolysis to enhance the adsorption capacity of biochar (BC). Scanning electron microscopy-energy-dispersive X-ray spectroscopy confirmed that Fe, Mn, and Ce were successfully loaded onto the surface of the BC. A series of adsorption experiments showed that the FMCBC exhibited improved adsorption of As(III) in an aqueous environment. The adsorption process was well expressed by the pseudo-second-order kinetic model. The adsorption capacity of FMCBC reached 8.74 mg L −1 , which was 3.27 times greater than that of BC. The pH of the solution significantly influenced the adsorption of As(III), where the amount of As(III) adsorbed by FMCBC was maximized at pH 3. A high phosphate concentration inhibited adsorption, whereas nitrate and sulfate ions promoted As(III) adsorption and increased the FMCBC adsorption capacity. Similarly, with increasing humic acid concentration, the adsorption capacity of FMCBC for As(III) decreased; however, a low concentration of humic acid promoted adsorption. X-ray photoelectron spectroscopy analysis revealed that the adsorption of As(III) by FMCBC occurred through redox and surface complexation reactions. Therefore, FMCBC has excellent potential for purifying arsenic-contaminated water.
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高影响因子
JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Zhaojing Kuang,Chenhao Yang,Panpan Li,Yongmin Duan,Wenyan Zheng,Mengdi Ye,Ying Tian
The rapid growth of artificial intelligence is driving demand for secure and rewritable optical information technologies. Bi-based photochromic glasses are promising, yet achieving high optical contrast, stable rewritability, and controllable formation of low-valence Bi species remains challenging. Here, Ce partially replaces Sb to regulate the multivalent redox environment, while Eu 3+ provides luminescent readout. The optimized glass containing 0.2 mol% CeO 2 exhibits a coloration contrast of 24.85% within 30 s, 4.3 times that of the Ce-free glass, and reaches 70.86% after 130 s of 465 nm irradiation. It exhibits a relative transmittance recovery of 99.66% after heating at 300 °C for 5 min and retains 98% of its coloration contrast after 50 writing–bleaching cycles. Photochromism-induced optical attenuation enables a reversible Eu 3+ emission modulation of 84.78% in the optimized glass. Combined X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), and high-resolution transmission electron microscopy (HRTEM) analyses indicate that Ce substitution regulates charge redistribution among Bi/Sb/Ce redox centers and oxygen-related localized states, facilitating reversible Bi 3+ reduction and the photoinduced formation of low-valence Bi-related nanoclusters. The coupled coloration and luminescence responses enable rewritable pattern recording, dual-mode optical verification, and matrix-based information encoding and reconstruction, providing an integrated Bi-based glass medium for multimodal optical storage and encryption.
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MATERIALS & DESIGN
·
2020
·
IF 6.289
Shuaida Zhu,Xiong Cao,Xiaoqing Cao,Yuqi Feng,Xinbing Lin,Kehua Han,Xiaoxia Li,Peng Deng
In this paper, we studied the effect of M-doped graphitic carbon nitride (M-g-C 3 N 4 , M = Fe, Nd, Ce, Zr, U) as a catalyst for the thermal decomposition of ammonium perchlorate-based molecular perovskite DAP-4. DAP-4 was synthesized by a molecular assembly strategy. G-C 3 N 4 and M-g-C 3 N 4 composite samples were prepared by pyrolytic and co-sintering methods. X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy-energy dispersion X-ray spectrometry, and X-ray photoelectron spectroscopy were used to characterize the morphology, structure, element distribution, and element chemical states of the catalysts. Differential scanning calorimetry was used to elevate the thermal catalytic decomposition effect of g-C 3 N 4 and M-g-C 3 N 4 on DAP-4. The results showed that g-C 3 N 4 and M-g-C 3 N 4 have catalytic activity for the thermal decomposition of DAP-4. Among the tested catalysts, Fe-g-C 3 N 4 had the best catalytic activity for the thermal decomposition of DAP-4, as well as advantages over pure g-C 3 N 4 and other M-g-C 3 N 4 catalysts. Especially, Fe-g-C 3 N 4 reduced the peak temperature of DAP-4 by 75.3 °C, increased heat release by 464 J g −1 , and decreased activation energy by 55.5 kJ mol −1 . Moreover, a possible catalytic mechanism is proposed. This work may offer a new way to promote the application of DAP-4 in the field of solid rocket propellants.
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ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Lei Hu,Junkai Hao,Ruhui Shang,Huitian Zhi,Xujie Wang,Yingchao Yang,Hanning Song,Chenxi Li,Juan Yu,Zhengquan Yan
Background Environmental safety and protection is accordingly one of the hottest issues to be concerned nowadays. Among all the chemicals to be monitored urgently, aminophenol and luminol are both quite hazardous but widely utilized in the fields of chemical industry, medicine, scientific research, chemical sensing, and so on. Although some reported ways could detect them satisfactorily, few reports could be found for portable visual monitoring and degradation of aminophenol and luminol, using only one sensor to judge the degradation degree as well. Results Fe-doped-Ce oxide modified chitosan fiber (Fe–Ce ox@CF) was developed by microwave-assisted hydrothermal method. By virtue of the excellent physical and chemical performance of carboxylated chitosan and its synergistic effect, Fe–Ce ox@CF possessed prominent oxidase-mimic activity to catalyze over 94 % luminescent luminol into dicarboxylic acid at room temperature. When utilized to accelerate the oxidization of ABTS, K m / V max were 0.0403 mM/2.327 × 10 −8 M s −1 . Especially, ultra-trace m -aminophenol ( m -AP) could exclusively alter the color of Fe–Ce ox@CF-ABTS from green to purple-red with remarkable visibility. Under the optimized conditions, there exhibited an excellent ratiometric colorimetric linear relationship between lg( A 515 / A 730 )/lg( A 515 / A 415 ) and c m -AP , and a fluorescent one between ΔF 427 and c luminol with detection limits (LOD) of 2.0 × 10 −9 M and 5.6 × 10 −9 M respectively. Especially, the red-green-blue (RGB) values got by a common smartphone also possessed good linear relationships with LODs of 1.7 × 10 −8 M and 1.34 × 10 −8 M. Significance This work represents the first oxidase-mimic based sensing system for potable and quantitative degradation of luminol and visual detection of m -aminophenol as well with the help of smartphones. It will also shed promising light on modified natural carbohydrate polymer-based sensors by non-destructive self-assembly and further application in practices.
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PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Shaopeng Li,Weichao Li,Yun Wu,Xianming Zheng,Xuehui Zhao,Ning Nan,Hongwei Zhang
The performance of supported catalysts is significantly affected by the dispersion degree of the active components on the support. In this study, citric acid (CA) was used as a modifier to prepare Al 2 O 3 supported Mn-Ce oxides (Mn-Ce/CA-Al 2 O 3 ) by the impregnation-calcination method. The characterization results showed that adding citric acid enhanced the dispersion of Mn-Ce oxides on the support, rendering Mn-Ce/CA-Al 2 O 3 with a larger specific surface area and abundant surface hydroxyl groups, thereby providing more reaction sites for catalytic ozonation. The Mn-Ce/CA-Al 2 O 3 exhibited excellent catalytic ozonation performance in degrading Reactive Black 5 (RB5) dye. It achieved nearly complete decolorization of RB5 within 60 min, with a COD removal efficiency of 60%, which was superior to the sole ozonation (30%). Furthermore, the Mn-Ce/CA-Al 2 O 3 system demonstrated significant degradation of RB5 over a wide pH range of 3–11. Based on the XPS and EPR analysis results, a preliminary mechanism of catalytic ozonation over the Mn-Ce/CA-Al 2 O 3 was proposed. The redox cycle of Mn 3+ /Mn 4+ and Ce 3+ /Ce 4+ effectively accelerated the electron transfer process, thus promoting the generation of reactive oxygen species (ROS) and improving the degradation of RB5. Meanwhile, the Mn-Ce/CA-Al 2 O 3 exhibited superior catalytic stability and effective treatment capabilities for real dye wastewater.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 40
·26690-26702
·
IF 4.493
Shengjie Xia,Mengmeng Shao,Xiaobo Zhou,Guoxiang Pan,Zheming Ni
A series of novel organic–inorganic nanoscale layered materials were synthesized by intercalating the Ti-containing Schiff base complex into the interlayer of the ZnM layered double hydroxides (LDHs, M = Al, Cr, Fe, Ce). The hybrid material was further calcined to make metal oxide composites with highly dispersed Ti elements (Ti/ZnO–MxOy). The structural characterization and photocatalytic results showed that, after intercalation and calcination, the metal oxide composites with a unique flower-like crystal morphology not only had high specific surface area, uniform pore size distribution and narrow band gap, but also showed extremely high photocatalytic performance for hexachlorobenzene (HCB) degradation. The Ti/ZnO–Cr2O3 composite with the narrowest band gap (2.40 eV) and the highest surface area (227 m2) showed the highest photocatalytic performance for HCB (95.5% within 240 min) among the four metal oxide composites. Particularly, it was found that composites derived from layered materials with different supramolecular structure of the host and guest showed different photocatalytic properties. In addition, based on the results from ESR, GC-MS and HPLC-MS, the type and amount of hydroxyl radicals, the decomposition intermediates and the pathway of HCB degradation photocatalyzed by Ti/ZnO–MxOy composites are also discussed in detail.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Qi Wang,Lijun Wang,Yanhui Sun,Aimin Zhao,Wei Zhang,Jianmin Li,Hongbiao Dong,Kuochih Chou
The influence of Ce addition on the precipitation of ferrite (δ) and sigma (σ) phase in super-austenitic stainless steels during solidification was investigated via a combined experimental and theoretical approach. Thermodynamic calculations reveal that the secondary phase of δ and σ are precipitated in sequence near the end of the solidification process due to the segregation of Mo and Cr. The Ce addition improves the thermal stability of the δ, expands the range of Mo content for δ phase precipitation and increases the δ fraction in the solidified structure in the Gulliver–Scheil model. Experimental observation shows that a small addition of Ce accelerates δ nucleation in the interdendritic solute-rich liquid, refines the solidified structure and reduces Mo and Cr segregation, which suppresses precipitation of the σ phase. The σ phase precipitation is replaced by δ phase precipitation after a Ce addition of 0.016%. The change in the secondary phase from σ to δ shortens the time required for homogenization and reduces the nano-hardness of the interdendritic secondary phase, which is significant for hot working.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Nanke Ma,Anqi Wei,Huiling Peng,Lixia Xie,Yuan Jin,Zhengzhi Yin,Guangli Li
Background Chirality plays a critical role in drug efficacy and environmental safety. The antibacterial activity of ofloxacin resides almost exclusively in its S-enantiomer (levofloxacin, LEV), while the R-enantiomer contributes little to therapeutic effects but may pose unnecessary risks. Rapid and reliable methods for enantioselective determination of ofloxacin enantiomers are therefore essential for pharmaceutical quality control, food safety monitoring, and environmental analysis. However, existing electrochemical sensors often suffer from limited enantioselectivity and insufficient sensitivity. To address this challenge, a novel enantioselective electrochemical platform is developed. Results A β-cyclodextrin/cerium-doped copper metal-organic framework/carboxylated multi-walled carbon nanotube composite (β-CD/Ce-doped Cu-MOF/MWCNTs-COOH) was fabricated on a glassy carbon electrode. The sensor achieves discrimination of ofloxacin enantiomers with an I L /I D ratio of 3.39. DFT calculations at pH 4.0 reveal that β-CD binds LEV with higher adsorption energy (−63.8 kJ/mol) than DEX (−58.3 kJ/mol), confirming the superior response for LEV originates from stereospecific inclusion. Quantitative analysis of LEV shows two linear ranges (0.03–1 μM and 1–10 μM) with a low detection limit of 0.01 μM. The sensor also enables accurate determination of LEV percentage in enantiomer mixtures across 0–100%. Excellent selectivity against common interferents, good reproducibility (RSD = 0.98%), repeatability (RSD = 1.26%), and long-term stability (95.2% retention after 21 days) are demonstrated. Practical applicability is validated by detecting LEV in commercial eye drops, honey, and tap water with satisfactory recoveries (96.0–108.0%). Significance and novelty This work presents the first application of Ce-doped Cu-MOF/β-CD/MWCNTs-COOH composites for the enantioselective electrochemical sensing of ofloxacin, a chiral fluoroquinolone antibiotic. The synergistic combination of high conductivity, abundant catalytic sites, and stereospecific host-guest recognition provides a generalizable strategy for high-performance enantioselective sensing, with promising applications in pharmaceutical, food, and environmental analysis.
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