RSC Advances
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2014
·Vol. 4
·期 13
·6500-6507
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IF 3.708
Zhujian Huang,Pingxiao Wu,Hailing Li,Wen Li,Yajie Zhu,Nengwu Zhu
A series of La and Ce doped hydroxyl FeAl intercalated montmorillonite (FeAl-Mt) were prepared by a co-intercalation method for catalytic oxidation of Reactive Blue 19 (RB19) by a heterogeneous photo Fenton process under natural sunlight irradiation. The physicochemical properties of the obtained catalysts were deciphered by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray absorption fine structure (XAFS) and UV-vis diffuse reflectance spectroscopy (DRS). The results showed that Ce or La doped FeAl Keggin polyoxocations were intercalated into the gallery of montmorillonite and the physicochemical properties of intercalated FeAl Keggin polyoxocations were mildly changed after Ce or La doping, resulting in defects and lattice vacancies. The doping of Ce or La could effectively improve the catalytic performance of FeAl-Mt measured by heterogeneous photo Fenton degradation of RB19 catalyzed by the obtained products. The synergistic effect between the doped element and FeAl intercalated montmorillonite played a crucial role in the enhancement of heterogeneous catalytic activity under natural sunlight irradiation.
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REACTIVE & FUNCTIONAL POLYMERS
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2015
·
IF 2.515
Chong Zhang,Lijuan Chen,Lin Tan,Xiajun Zheng,Yanmei Wang
In this study, a set of well-defined multiarm star copolymers , hyperbranched poly(ethylenimine)-graft-poly(ethylene glycol) (bPEI- g -PEG) with different PEG grafting ratios were synthesized. The star PEG-based coatings were then prepared by immobilizing the corresponding copolymers onto poly(dopamine) (PDA)-coated substrates. The chemical composition , hydrophilicity , surface topography , and thickness of the coatings were studied by X-ray photoelectron spectroscopy (XPS), water contact angle (WCA), atomic force microscopy (AFM), and variable angle spectroscopic ellipsometry (VASE), respectively. Furthermore, the surface PEG chain density of star PEG-based coating was evaluated quantitatively and compared with that of linear PEG-based coating. Our results showed that the amount of proteins (albumin from bovine serum, fibrinogen, and lysozyme) adsorbed on the star PEG-based coating as measured by surface plasmon resonance (SPR) was found to be dependent on the surface PEG chain density, which was controlled by the polymer incubation concentrations and PEG grafting ratios. Generally, the star-shaped PEG gave the surface with higher PEG chain density than linear ones and the amount of adsorbed proteins decreased with increasing surface PEG chain density. At last, the star PEG-based coating was successfully applied into the capillary inner surface for protein separation by capillary electrophoresis (CE).
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 25
·19601-19612
·
IF 3.84
Tigang Duan,Ye Chen,Qing Wen,Ying Duan
Sb-doped SnO2 electrode was fabricated by the one-step pulse electro-codeposition method, and was modified through either cerium dioxide nanoparticle (nano-CeO2) or cerium ion doping. The results showed that the effects of nano-CeO2 doping and cerium ion doping are quite different. Nano-CeO2 doping shrinks the unit cell volume, improves the degree of crystallinity and refines crystalline grains, while cerium ion doping expands the volume and deteriorates the crystallinity. Nano-CeO2 doping mitigates the surface antimony enrichment and promotes the complete oxidation of antimony so that the majority of antimony oxidation states exist as the Sb5+ state, but cerium ion doping aggravates the enrichment and increases the Sb3+ content. Electrochemical phenol degradation showed that the Ti/Sb–SnO2–CeO2 electrode has a higher degradation efficiency and its kinetic rate constant is 1.46 times as much as that of Ti/Ce–Sb–SnO2. Besides, due to the compact active layer of Ti/Sb–SnO2–CeO2 protecting the titanium substrate from passivation, the accelerated service lifetime of Ti/Sb–SnO2–CeO2 is prolonged, which is 1.28 times as long as that of Ti/Ce–Sb–SnO2.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Zhenzhen Yang,Wei Qi,Rongxin Su,Zhimin He
Three-dimensional flower-like Ce–Mo micro/nano composite oxides with different Ce/Mo atomic ratios (f-Ce10-xMoxOδ) were synthesized as effective bifunctional catalysts for one-pot conversion of fructose to 2,5-diformylfuran (DFF) via dehydration and aerobic oxidation. The catalytic activities of f-Ce10-xMoxOδ depended on their structure and physicochemical properties, which were closely related to their elementary compositions. The f-Ce9Mo1Oδ, which possesses polymeric octahedral MoOz species, the highest Oα ratio, BET surface area, and acidity density, exhibited the highest catalytic activity for DFF production. High DFF yields of 94% and 74% were obtained from f-Ce9Mo1Oδ catalyzed HMF oxidation and “one-pot” fructose conversion, respectively. Furthermore, f-Ce9Mo1Oδ is easily prepared, has low cost, and is ecofriendly, which has potential application in industrial production of DFF from fructose.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Cai Xu,Shandi Zhong,Lei Yuan,Mincheng Yu,Yingqi Chen,Liyan Dai,Xiaozhong Wang
It is desired but challenging to develop a non-noble metal catalyst for the selective oxidation of benzyl alcohol with O 2 under solvent-free conditions. Herein, a series of Ce-doped high entropy oxides (Ce/HEOs) were prepared via co-precipitation and subsequent thermal treatment method. It was found that, the doping of Ce could remarkably promote the catalytic activity for selective oxidation of benzyl alcohol to benzaldehyde. The improved activity was ascribed to the good distribution of active Ce species, the increased oxygen vacancies, and the synergistic effect between CeO 2 and high entropy oxides (HEOs). In addition, the surface oxygen of Ce/HEOs towards Ce displayed stronger reducibility compared to that of bare CeO 2 , endowing it stronger deprotonation ability towards benzyl alcohol during the reaction. The prepared catalyst exhibited satisfactory reusability and stability owing to the entropy-stabilized effect of HEOs and the interaction between CeO 2 and HEOs, and negligible loss in catalytic activity was observed after seven runs. Besides, DFT calculations disclosed that, with the doping of Ce, the Ce/HEOs catalyst possessed stronger adsorption ability towards benzyl alcohol, and lower free energy was required for the rate-determining step during the whole oxidative reaction. This work gave some insights into the promotional effect of Ce doped into high entropy oxides for the solvent-free catalytic oxidation of benzyl alcohol.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Min Zhou,Dan Zheng,Kun Yang,Lifang Hu,Zhongbiao Zhang
Fenton catalytic oxidation is a prevalent advanced oxidation technology that can be integrated with photocatalysis and thermal catalysis to enhance the degradation of antibiotic wastewater. Zeolites, a distinctive class of crystalline material, are extensively employed in Fenton-like catalytic oxidation due to their robust structure and exceptional catalytic efficacy. In this study, we constructed a novel Cu/Ce-X catalyst via an ion exchange process based on a Na-X zeolite matrix. The crystal phases, framework structures, elemental compositions, specific surface areas, and photothermal catalytic activity of the composite catalyst were characterized systematically. The removal of tetracycline hydrochloride (TCH) was 87.69 % in the photothermal Fenton-like degradation, and the apparent first-order kinetics rate constant was 13.6 times, 6.52 times, and 1.72 times greater than those of the Fenton-like, photo Fenton-like, and thermal Fenton-like systems, respectively. The adaptability, reusability, reaction mechanisms, and degradation pathways of the fabricated catalysts for the removal of TCH were investigated. The experimental and characterization results demonstrate that the redox cycling of Cu + /Cu 2+ and Ce 3+ /Ce 4+ was enhanced through photogenerated electrons and thermal effects in the catalytic degradation process. The primary active species generated in the photothermal Fenton-like system is ·OH. The findings of this research provide a viable strategy for the treatment and remediation of water pollution.
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FUEL
·
2024
·
IF 6.7
Zhuoyu Zheng,Yuxin Ge,Weiwei Lu,Yiyuan Zhou,Haiping Zhu,Pengxiang Gao,Caimei Li,Wenzheng Lei,Pengcheng Zhao,Jiajin Li,Minglei Lu,Tiejun Wang
Aqueous-phase reforming of methanol (APRM) for both hydrogen (H 2 ) production and high pressure storage shows promising potential in mobile/distributed fuel cell stations or vehicles. Currently, achieving efficient H 2 production with low CO selectivity (S-CO) at lower temperatures remains a challenge for its application in these fields (rapid start and running in cycles). Herein, the catalyst of Ce-modified Cu nanoparticles with N-doped carbon encapsulation (Cu-CeO 2 @PVP catalyst) is developed to give excellent H 2 production rate at low temperatures ranging from 110 °C to 180 °C, ensuring excellent hydrothermal stability. The H 2 production rate of 32.56 μmol·g cat -1 ·s −1 at 180 °C is 6.1 times to 10.2 times higher than those of commercial catalysts, which demonstrates its superior performance. The combined effect of Cu + /Cu 0 and CeO 2 promotes the H 2 production from CH 3 OH/H 2 O. It also suppresses the CO formation by enhancing the H 2 O dissociation, CO conversion and HCOOH decomposition in APRM. The stable high purified H 2 flow from the integrated slurry bed APRM device can start immediately the fuel cell vehicle without any delay.
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JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Yuanjie Xu,Rong Chen,Hongqiao Lin,Qian Lv,Bo Liu,Lizhi Wu,Li Tan,Yihu Dai,Xupeng Zong,Yu Tang
Catalyst interface determines the activity and stability of partial oxidation of methane (POM) toward syngas under high temperatures crucially. Herein, Ni catalysts supported on CeO 2 were prepared under different pretreatment atmospheres to construct an optimal and robust interface. Ni/CeO 2 catalyst pretreated in H 2 (Ni/CeO 2 -H 2 ) exhibits the higher activity and the better stability than Ni/CeO 2 -Ar and Ni/CeO 2 -air catalysts. The Ni-O-Ce interfacial site in Ni/CeO 2 -H 2 catalyst shows the lower reduction temperature, indicating the enhanced H-spillover effect and enhanced oxidation resistance of Ni under POM conditions. Moreover, the XPS and in situ Raman results show that Ni/CeO 2 -H 2 contains more surface oxygen vacancies for adsorbing and activating oxygen, further contributing to the reaction activity. The in situ DRIFTS results indicate that the CH 4 could react with the lattice oxygen to form formate and carbonate, and further decompose to CO and CO 2 . These findings deepen the fundamental understanding of Ni/CeO 2 catalysts for POM reaction.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
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2024
·
IF 3.2
Jie Feng,Yongchang Zhu,Jichuan Huo,Zhu Cui,Liu Yang,Jing Li,Qian Wu
In this paper, using borosilicate glass was used as the base glass, using La 2 O 3 ,CeO 2 simulated trivalent and tetravalent lineage actinide nuclides, study the interaction between La 2 O 3 and CeO 2 in borosilicate and the properties of the cured body, and obtain the borosilicate cured body sample by solid melting method. By XRD, SEM-EDS, FTIR test results showed that adding CeO 2 at the fixed La 2 O 3 content will reduce the packing capacity of borosilicate glass to La 2 O 3 , but adding La 2 O 3 at the fixed CeO 2 content will increase the packing capacity of borosilicate glass to CeO 2 . Density tests showed that adding CeO 2 at the fixed La 2 O 3 content will increase the cured body density and then decrease, but adding La 2 O 3 at the fixed CeO 2 content will only increase the cured body density all the time.The results of 28 days of leaching experiments showed that the leaching rate of Ca and Si elements was kept at 10 –4 dot product in all samples, while the leaching rate of La and Ce elements remained at 10 –6 dot product or even lower, indicating the good chemical stability of the cured body.
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TALANTA
·
2024
·
IF 5.6
Lulu Cui,Houshen Li,Weijie Shi,Yingying Jing,Shuhong Sun,Shiyun Ai,Zeyi Guo
Reducing the size of active species is a powerful means to improve the utilization rate of active metals and enhance the properties of bimetallic nanozymes. In this work, Fe was introduced into Ce-MOF through the coordination of Fe 3+ and organic ligands, and the coordination effect resulted in atomically dispersed Fe in the derived Fe/CeO 2 nanozyme. Due to the atomically dispersed Fe embedded in the lattice of CeO 2 , a large number of defect sites were generated, endowing the nanozyme with excellent peroxidase (POD)-like activity. The constructed total antioxidant capacity (TAC) sensor based on the POD-like activity of Fe 1.01 /CeO 2 nanozyme displayed a very wide linear concentration range for AA, Cys, Glu and Trolox. More importantly, this TAC sensor can be applied to the TAC detection in vitamin C tablets and beverages. This work provides theoretical guidance for the synthesis of high-performance bimetallic nanozymes for TAC detection.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Ze Luo,Qingxin Liang,Yuanshuai Qi,Guoqiang Huang
There is an urgent need for efficient and cost-effective adsorbents for the removal of trace hydrogen phosphide (PH 3 ) from the circular hydrogen systems in the polysilicon chemical vapor deposition furnaces. In this study, a straightforward and cost-effective method was used to synthesize a highly efficient adsorbent (Ce x -Cu y /TiO 2 ) for PH 3 removal using TiO 2 as the carrier and CuO as the active substance. Experimental findings demonstrated that optimal Ce doping amounts (n Cu :n Ce = 20:1) markedly enhanced the adsorbent's performance, with an adsorption capacity reaching as high as 149.14 mg g −1 . Material characterization results indicated that Ce positively influenced the uniform dispersion of Cu on the TiO 2 surface, and Ce doping increased the adsorbed oxygen content of the adsorbent, consequently enhancing its oxidation performance. The investigation of the reaction mechanism and causes of adsorbent deactivation revealed that the depletion of active substances (CuO) in the adsorbent and the accumulation of products such as Cu 3 P and phosphates are the primary factors contributing to its deactivation. Furthermore, high-temperature calcination could restore the activity of the adsorbent, indicating its great potential for engineering applications.
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RARE METALS
·
2024
·
IF 9.6
Hu Xiao-Jie,Sun Yu-Han,Liu Ling-Yue,Mao Dan-Jun,Zheng Shou-Rong
Monochloroacetic acid (MCAA) is identified as a highly carcinogenic disinfection by-product in chlorinated drinking water. In this study, a series of CeO 2 -supported Pd catalysts (Pd/MCeO 2 ) were synthesized through one-step calcination of Pd-loaded Ce-UiO-66-BDC (Ce-MOF), and the liquid-phase catalytic hydrodechlorination of MCAA was explored using these catalysts. For comparison, Pd/CeO 2 catalysts were additionally synthesized using the conventional impregnation method. The characterization results reveal that the catalysts exhibit strong metal–support interaction, leading to high Pd dispersion and Pd n + content. Additionally, the calcination temperature significantly influences catalytic performance, with the catalyst calcined at 500 °C (Pd/MCeO 2 -500) demonstrating the highest catalytic activity and achieving complete dechlorination of MCAA within 50 min. Furthermore, it is found that the catalytic MCAA hydrodechlorination using the catalysts adheres to the Langmuir–Hinshelwood model. Accordingly, low reaction pH is favorable for the catalytic hydrodechlorination of MCAA, enhancing MCAA adsorption on the catalyst surface due to the electrostatic interaction between MCAA and the catalyst surface. Theoretical results suggest that the presence of Pd n + efficiently facilitates MCAA adsorption and C–Cl cleavage, thus significantly enhancing the liquid-phase catalytic hydrodechlorination. Graphical abstract
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