INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2026
·Vol. 27
·期 12
·5411
·
IF 5.6
Zhaoping Sang,Bowen Tang,Yunhao Zhuo,Lixin Li,Qi Zhang,Yinan Jin,Huiming Zhang,Gang Zhao
Prolonged use of clear aligners promotes bacterial colonization and biofilm formation, which can compromise orthodontic outcomes. There is a clear clinical demand for approaches that can suppress pathogenic activity while preserving the fundamental functional and material characteristics of the aligners. To address this need, a novel strategy of fabricating metal–organic framework (MOF) coatings on aligners was adopted. Metal–organic frameworks (MOFs) have emerged as promising antibacterial coating materials by combining antimicrobial metal ions with biocompatible organic ligands. Three distinct porphyrin-based MOFs (Ag-, Cu-, and Ce-TCPP) were synthesized and fabricated as coatings on clear aligner surfaces via a coordination-driven self-assembly approach. The coated aligners were comprehensively assessed in vitro to determine their antibacterial performance, anti-inflammatory potential, biocompatibility, and key physical characteristics. Among the three coatings, Ag-TCPP showed the most favorable overall antibacterial and anti-biofilm performance in the present experimental system and facilitated macrophage polarization toward an anti-inflammatory M2-like phenotype. Ag-TCPP exhibited a significant inhibition zone of 6.75 ± 0.25 mm and reduced biofilm biomass by 72.2%. All MOF coatings exhibited excellent biocompatibility, and their application did not compromise the aligners’ mechanical integrity or aesthetic properties (light transmittance). This study reports the successful development of a novel metal–organic framework (MOF)-based coating strategy for clear aligners. Among the formulations investigated, the Ag-TCPP coating exhibited outstanding antibacterial and immunomodulatory performance while maintaining the critical mechanical integrity and aesthetic qualities of the aligner. The findings of this work offer a practical approach to designing multifunctional orthodontic devices that may reduce biofilm-related complications and improve clinical outcomes.
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JOURNAL OF CATALYSIS
·
2026
·
IF 6
Denghui Cheng,Yang Gao,Huan Yang,Fuqing Gong,Guohao Yin,Yuyang Luo,Yongqiang Tian,Shuheng Chen,Jingbo Du,Jia Yang,Zhen Huang,De Chen
Ammonia decomposition is an appealing method for on-site hydrogen production, enabling ease of transportation and storage of H 2 . However, the high-temperature and hydrogen-rich environment present a challenge in developing highly efficient and stable catalysts. Hence, this study outlines an exsolution strategy for synthesizing a Ni-based catalyst in intimate contact with CeO 2 . The Ce 10 /NiAl 2 O 4 catalyst exhibits competitive catalytic performance for ammonia decomposition reaction, and achieves a hydrogen production rate of 78.3 mmol g cat −1 min −1 at 550 °C. Importantly, the robust structure of the Ce 10 /NiAl 2 O 4 catalyst ensures that no significant deactivation is observed during the 200-h stability test. HRTEM, XRD, TPD and kinetic studies reveals that the presence of CeO 2 enhances the dispersion of exsolved Ni nanoparticles, modulates the surface basicity of catalyst, reduce the reaction activation energy, promote the desorption of nitrogen/hydrogen species, and subsequently promotes NH 3 adsorption/activation capacity·NH 3 -TPD-MS in combination with in-situ DRIFTS demonstrate that CeO 2 could accelerate the recombination and desorption of N* adatoms, which is the rate limiting step, thereby significantly boosting catalytic performance. Furthermore, the DFT calculations reveal that the interaction between CeO 2 and Ni species facilitates electron transfer toward Ni, lowering the barrier for both N–H dissociation and N* recombination and desorption. This work not only presents an efficient and stable noble-metal-free catalyst for ammonia decomposition to generate hydrogen, but also provide a general strategy to engineer high-performance catalysts applicable to harsh catalytic environments.
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JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Zhengyang Chi,Yonghong Niu,Lin Ma,Yuan Tian,Hao Li
The global transition toward low carbon energy systems has intensified the demand for renewable H 2 and cleaner syngas production. Biomass steam gasification is a promising route, but tar formation and catalyst deactivation still limit its practical application. Herein, Pr 1– x Ce x FeO 3 supported on calcined dolomite was developed for staged biomass steam gasification to couple H 2 production with tar reforming. Statistical screening identifies gasification temperature, Ce substitution level, and steam flow rate as the dominant factors controlling H 2 formation. Under single-factor conditions, Pr 0.6 Ce 0.4 FeO 3 /CD shows the best performance, giving 44.33 vol% H 2 , a total gas yield of 1.51 Nm 3 /kg biomass, a syngas yield of 1.10 Nm 3 /kg biomass, and a syngas fraction of 72.77 vol%. Tar conversion is optimal near 850 °C, where the dry tar yield decreases to 22.75 g/kg biomass, while heavy polycyclic aromatics and >C13 compounds account for 0.79% and 4.14% of the total gas chromatography-mass spectrometry (GC-MS) peak area, respectively. Response surface optimization gives an optimum at 810 °C, x = 0.4, and a steam flow rate of 1.2 mL/min, with an experimental H 2 fraction of 46.22 vol%. Structural and surface analyses indicate that moderate Ce substitution preserves the perovskite framework while regulating defect formation, surface oxygen species, and Fe/Ce/Pr redox behavior. Cycling deactivation is mainly associated with carbonaceous deposits, Fe migration, CaO carbonation, and structural densification. This work provides a feasible perovskite dolomite strategy for integrated tar reforming and production of syngas rich in H 2 from biomass.
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MOLECULES
·
2026
·Vol. 31
·期 16
·2775
·
IF 5.1
Binyu Wang,Cong Feng,Huan Liu
To clarify the role of metal dopants in low-temperature NH3-SCR of NO, FeMnTiOxcatalysts were synthesized by coprecipitation and separately modified with Ce, Co, or W. The catalysts were evaluated for NO conversion, separate O2/H2O switching response and dry-feed time-on-stream stability and characterized by XRD, SEM, N2adsorption–desorption, XPS, H2-TPR and NH3-TPD. Ce doping at Ce/Mn = 0.3 suppressed TiO2crystallization, increased the BET surface area from 136 to 231 m2g−1and the pore volume from 0.19 to 0.58 cm3g−1, raised the Mn4+/Mn3+ratio from 0.70 to 1.25, and increased the medium-strong-acid relative peak area from 555.4 to 1293.2 a.u. FeMnCe0.3TiOxmaintained at least 90% NO conversion from 140 to 360 °C, gave 75% conversion at 400 °C, and averaged 97.4% during a 40 h dry-feed test at 350 °C. The results show that the superior Ce-modified catalyst arises from the combined regulation of texture, surface redox balance and acidity.
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SURFACE & COATINGS TECHNOLOGY
·
2017
·
IF 2.589
Xiaowei Zhou,Chun Ouyang
This paper presented an effective approach for electroplating of coatings on the activated surface of pure Ti substrate using pulsed electro deposition. Regarding the ceramic-like TiO 2 barrier layer on its surface of Ti substrate to inhibit surface activity, a novel activating solution that composed of HF, HCl, Ce(NO 3 ) 2 , TiCl 3 , and bal. DMF dissolvent was applied for surface modifications of Ti substrate in order to increase interfacial bonding strength of surface Ni coatings. Besides a comparative study of Ni nanocrystalline coatings without and with CeO 2 addition was carried out for disclosing the role of the Ce-rich phase on managing microstructure and high-temperature oxidation resistance during oxidation at 800 or 1000 °C. Results indicated that Ce-rich precipitations, where dispersed along grain boundaries (GBs), were favorable for completing the spalling oxide-layers on Ni-CeO 2 nanocomposite coatings during oxidation at 800 °C. Furthermore, an analytical modeling was validated for better understanding of Ce-rich precipitations along GBs defects for monitoring oxidation mechanisms. Furthermore, this finding would be therefore leading to the guidelines for Ce-rich precipitations on the strengthening of Ni-based superalloys.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 5
·11994-12004
·
IF 5.19
Ye Chen,Fang Tingwei,Long Xinyi,Wang Hui,Chen Shao,Zhou Jie
Compared with that of the transition metal mixed oxide pellet catalyst, the catalytic activity of the supported mixed oxide catalyst was significantly reduced, which was limited in practical industrial applications. In this work, supported Cu-Mn-Ce mixed oxide catalysts were prepared by non-thermal plasma. Catalyst characterization result demonstrated that plasma treatment could promote the proportion of oxygen vacancy and enhance the adsorptive strength of VOCs on the surface of catalyst. Meanwhile, plasma treatment process exerted a slight influence on the pore structure and morphological property of the catalyst. Consequently, CMC/SiO 2 –P exhibited much higher catalytic activity than CMC/SiO 2 prepared by the incipient wetness impregnation method for the catalytic oxidation of toluene and n-hexane. Among the catalysts prepared, the 15%CMC/SiO 2 –P catalyst even exhibited a high catalytic activity comparable to that of the supported noble metal catalyst for the oxidation of the inert hexane. The T 98 of toluene and n-hexane over 15%CMC/SiO 2 –P was 260 and 280°C under the conditions of VOC concentration at 1000 ppm and WHSV at 20,000 mL·g −1 ·h −1 , respectively. This work provided a novel method for the preparation of the supported transition metal mixed oxide catalyst.
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APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Linxi Wang,Zhen Yang,Yutong Liao,Jianhong Luo
Industrial sewage containing oil and dye has already aroused the concerns of cosmopolites. Nowadays, membrane technology is regarded as the spotlight and highly-efficient treatment for various wastewater from human activities . Massive efforts have been put into newly synthesis of low-cost, eco-friendly, low energy consumption, reusable and robust Co-Al-Ce LDHs coated stainless steel mesh (SSM) for wastewater treatment . The CoAlCe-LDHs SSM was fabricated by facile hydrothermal method successfully. While the pristine SSM didn't exhibit selective wettability with water contact angle (WCA) of 114.5°, the novel CoAlCe-LDHs SSM possessed superhydrophilic and underwater superoleophobic property with underwater oil contact angle (UOCA) of 158.5°. The CoAlCe-LDHs SSM was compatibly applied to the separation of oil/water mixtures with highly separation efficiency above 99.5% and ultrafast water flux of 52.2 L·m −2 ·s −1 under gravity. The easily-fabricated CoAlCe-LDHs SSM was qualified with recyclable, stable and anti-fouling properties, which stayed effective for the separation of oil/water mixtures under at least 30 times recycle and harsh conditions. Moreover, the bifunctional CoAlCe-LDHs SSM also showed excellent photocatalytic activity of dye degradation (with 94.2% degradation of methyl orange solution within 160 min), which can be beneficial to sewage treatment .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiaohua Cao,Tianhao Ai,Zhizhi Xu,Jichang Lu,Dingkai Chen,Dedong He,Jiangping Liu,Rui Tian,Yutong Zhao,Yongming Luo
High sulfur resistance and high stability of catalysts are crucial for the catalytic decomposition of sulfur-containing volatile organic compounds. In this work, compared to 5Ce-MCM-41, the 5Cr-MCM-41 catalyst exhibited ultra-stability (no activity loss at 600 h) and higher sulfur resistance. The physical structure and chemical characteristics of the catalysts were analyzed by XRD , H 2 -TPR, NH 3 -TPD, CO 2 -TPD, XPS , and TEM. Combining the characterization results, we found that the 5Cr-MCM-41 catalyst presented outstanding catalytic performance due to superior reducibility and appropriate acidity, which results in the conversion of most of the C and S elements in the CH 3 SH to the gas-phase coke- and sulfur-containing products rather than accumulating on the catalyst surface. Meanwhile, the catalytic performance, reaction path, and deactivation mechanism of rare earth metal (Ce) and transition metal (Cr) modified MCM-41 catalysts were systematically investigated by in situ DRIFTS and DFT calculations. Additionally, a new active phase (sulfide state Cr 2 S 3 ) was proposed and proved via accurately designed experiments, which plays a significant role in the collaborative removal of CH 3 SH with hexavalent chromium (Cr(VI)). These findings are beneficial for designing high sulfur resistance catalysts for the removal of CH 3 SH and other sulfur-containing products.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Shuangli He,Jinghang Ren,Peng Cao
Low-temperature selective catalytic reduction (SCR) is effective and promising for converting NO x in flue gas into N 2 , with wide application prospects. However, low-temperature denitration (DeNO x ) catalysts are susceptible to SO 2 and H 2 O poisoning. Here, we prepared a monolithic Mn-Fe-Ce/Al 2 O 3 catalyst that exhibited excellent DeNO x performances at low temperatures. At 110 °C, the NO conversion rate of the catalyst was> 90%, exhibiting excellent resistances to H 2 O and SO 2 ·H 2 O and SO 2 are introduced at the same time, the efficiency is as high as 73%. Furthermore, The catalyst has a porous structure with abundant chemisorbed oxygen spices and exposed active, the reaction pathway on the catalyst proved to be the L-H mechanism based on in situ DRIFTS. This study also explored the mechanisms of low-temperature SCR catalyst poisoning by SO 2 and H 2 O, providing insights into the effects of SO 2 and H 2 O and theoretical support for the development of poisoning-resistant low-temperature SCR catalysts.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 8
·3159-3169
·
IF 4.569
Qinghong Meng,Guoying Zhao,Qi Zhu,Xudong Sun,Ji-Guang Li
Doping Gd2LuAl5O12:Ce with a Ca2+/Si4+ pair produced a series of Gd1.97−xLuCaxAl5−xSixO12:0.03Ce (x = 0.0–1.2) garnet new phosphors, and remarkable regulation of the crystal structure and Ce3+ luminescence was achieved. Rietveld refinement and spectral analysis revealed that greater incorporation of Ca2+/Si4+ led to a higher lattice rigidity by cell contraction, a narrower bandgap, a longer average bond length/less distortion of the [CeO8] dodecahedron and decreased centroid shift/crystal field splitting of the Ce3+ 5d energy level. A blue-shifted 4f–5d1 transition, a narrower emission band, improved thermal stability of luminescence and a shorter fluorescence lifetime were observed with increasing Ca2+/Si4+ content. Applying the yellowish-green-emitting Gd0.77LuCa1.2Al3.8Si1.2O12:0.03Ce optimal phosphor (x = 1.2), together with a commercial CaAlSiN3:Eu red phosphor, in 450 nm-excited LED lighting produced a low CCT of ∼3625 K and a high CRI/R9 of ∼95.2/94.8, indicating that the phosphor has application potential in high-performance w-WLED.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Guangchun Song,Junjie Zhang,Huixian Huang,Xin Wang,Xiaoyun He,Yunbo Luo,Jin-cheng Li,Kunlun Huang,Nan Cheng
Rapid detection of pesticide residues based on enzyme mimics has recently attracted much interest. However, most nanozymes have low activity. Herein, a “single-atom Ce-N-C nanozyme” (SACe-N-C nanozyme) was rationally devised and verified to mimic peroxidase (POD-like) with superior activity. Based on its high POD-like activities and cascaded catalytic reactions with acetylcholinesterase (AChE), we constructed a bioactive paper for the detection of pesticide residues, which offered a portable approach to monitor fruits and vegetables within 30 min. More importantly, a 3D printed platform was integrated on the basis of SACe-N-C bioactive paper to achieve on-site portable testing of omethoate, methamidophos, carbofuran, and carbosulfan, showing limits of detection (LODs) of 55.83, 71.51, 81.81, and 74.98 ng/mL, respectively. The recovery rates were 84.09–104.68%. This study provided new insight into the design of novel single-atom nanozymes for cascaded catalytic detection and other rapid detection applications with high efficiency and low cost.
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ACS Omega
·
2021
·
IF 3.512
Xiutao Li,Feng Zhang,Mengjie Zhang,Xiaomeng Zhou,Haijun Zhang
In this work, a series of rare earth-based metal–organic frameworks (RE-MOFs) with the same organic ligand were synthesized and studied as flame retardants on epoxy. Through thermogravimetric analysis, limiting oxide index, UL-94, and cone calorimeter tests, a Y-based MOF (Y-MOF) showed the best flame retardancy compared with a La-based MOF (La-MOF) and Ce-based MOF (Ce-MOF). Further research with Raman, X-ray photoelectron spectroscopy, and theoretical calculation revealed that the reasons for the different flame retardance performances of RE-MOFs resulted from the catalytic carbonizing abilities and the radical-trapping abilities of La, Ce, and Y.
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