JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Tianyu Wang,Wenyan Guo,Yonghui Xia,Yuefang Zhu,Li Chen,Yafeng Zhang,Guangli Li
The abuse and persistent use of Lomefloxacin (LOM) produces residues that deteriorate the ecological environment and endanger human health. Therefore, it is highly urgent to establish a simple and reliable method for the determination of LOM to guarantee food safety. Herein, a sensitive voltametric sensor based on bimetallic UiO-66(Zr/Ce) MOF/reduced graphene oxide (UiO-66 (Zr/Ce)/rGO) was fabricated for the determination of trace LOM residues in milk. The UiO-66(Zr/Ce)/rGO increased the electroactive surface area and lowered the charge transfer resistance. Due to the synergistic interactions between UiO-66(Zr/Ce) MOFs with good electrocatalytic activity and rGO nanosheets with high electrical conductivity, the UiO-66(Zr/Ce)/rGO/GCE exhibited the highest peak current response of LOM, 4.2-fold higher than the bare GCE. Consequently, the UiO-66(Zr/Ce)/rGO showed remarkably electrocatalytic activity for LOM oxidation with two broad linear detection ranges (0.03 – 2.0 μM and 2.0 – 30 μM), high sensitivities (5.1254 and 0.2198 μM μA −1 ), and a low detection limit (5.0 nM). The UiO-66(Zr/Ce)/rGO exhibited strong anti-interfering ability against potential interfering species even at high concentration, and maintained robust voltametric responses up to 25 days. Moreover, the UiO-66(Zr/Ce)/rGO/GCE achieved accurate determination of trace LOM residues in liquid milk with good recovery (96.11 − 103.2 %) and highly consistent sensitivity with that in PBS.
研究领域:
分析化学
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食品安全
·
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·Vol. 99
·期 9
·1962-1975
·
IF 1.687
Haoran Du,Zhaoping Zhong,Bo Zhang,Jimin Fu,Zhaoying Li
To obtain high-value bio-oil, pure ceria (CeO 2 ) and a series of Ce/Fe composite metal oxides were synthesized via precipitation method and were used to enhance hydrocarbons and ketones production during catalytic pyrolysis of bamboo sawdust. The characterization results were comprehensively analyzed and revealed that doping CeO 2 with Fe promoted the formation of a solid solution structure, which further increased the surface area and number of oxygen vacancies of the catalyst for deoxygenation. Experimental consequences demonstrated that, compared to non-catalytic trial, the catalytic pyrolysis over CeO 2 generated lower amounts of acids and aldehydes, and enhanced the conversion of large oxygenates to monofunctional hydrocarbon precursors via decarboxylation, deoxidation, and ketonization. The concentrations of hydrocarbons and ketones obtained over Ce/Fe catalysts were significantly higher than those obtained over CeO 2 , and that was attributed to the higher surface area and oxygen storage capacity of Ce/Fe catalysts. Particularly, the composite catalyst with the Ce/Fe molar ratio of 4 (Ce 0.8 Fe 0.2 ) presented the most optimal deoxidation capacity in this study. The relative concentration of hydrocarbons generated over Ce 0.8 Fe 0.2 was the highest, and monocyclic aromatics and short-chain aliphatic hydrocarbons accounted for 47.13% and 29.72%, respectively, of the total hydrocarbons. Simultaneously, the amount of ketones, the main hydrocarbon precursors, obtained over Ce 0.8 Fe 0.2 was significantly higher than that obtained over CeO 2 , and the fraction of linear and cyclic ketones of the total ketones increased from 45.96% for the non-catalytic pyrolysis to 97.57%. This further confirmed that the mesoporous Ce/Fe composite catalysts efficiently catalyzed the aldol condensation and ketonization reactions.
研究领域:
能源与环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 48
·35993-36004
·
IF 3.9
Jinlong Zhong,Xue feng Mao,Guanyu Wang,Heng Li,Junfang Li,Sijian Qu,Jianwei Zhao
Non-homogeneous ozone-catalyzed oxidation technology is one of the effective ways of treating wastewater, the core of which lies in the development of efficient ozone oxidation catalysts. This work proposes the design and synthesis of an efficient Cu/Mn/Ce multi-metal composite oxide catalyst by metal salt precursor mixing-direct granulation. The effect of metal doping on the catalyst properties was compared using Density function theory (DFT) calculations, and the Cu/Mn/Ce co-doping showed significant charge accumulation effect with a low ozonolysis energy barrier, which is more favorable for the generation of reactive oxygen species. The successful loading of the main active metal components, such as Mn, Cu, and Ce, was clarified by systematic characterization by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and Brunauer–Emmett–Teller's test (BET), and the chemical oxygen demand (COD) removal could reach more than 60% for the simulated wastewater. The electron paramagnetic resonance (EPR) characterization clarified that the degradation of organic pollutants was mainly dominated by the combination of single-linear oxygen and superoxide radicals in the catalytic process, and the possible catalytic oxidation mechanism was proposed. This work advances the development of non-homogeneous ozone oxidation technology.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Xidong Wang,Li Xu,Luhan Wang,Shuyang Bao,Yu Wang,Qianxiong Wen,Yanrong Liang,Zhaopin Chen,Xiaoli Fang,Weidong Xiang
As an inorganic color conversion material, phosphor-in-glass film (PiF) has received extensive attention in the sphere of laser-driven white lighting due to its excellent integrated performance. The yellow-emitting phosphor La 3 Si 6 N 11 :Ce has excellent thermal stability and wide emission band, which makes it more competitive than Y 3 Al 5 O 12 :Ce in laser-driven white lighting. Herein, we embedded La 3 Si 6 N 11 :Ce phosphor powder in a silicate glass matrix (SiO 2 –B 2 O 3 –CaO–Na 2 O) and sintered it on a sapphire substrate. In the silica-rich glass system, the network structure of silica-oxygen tetrahedral glass is more rigid and the thermal erosion of the phosphor by the silica-based glass is less, which makes the phosphor maintain better performance after low-temperature co-sintering. The quantum efficiency in the optimized LSN phosphor-in-glass film (LSN PiF) is up to 81 %, and the thermal conductivity is 10.2 Wm −1 K −1 , showing good thermal stability. Impressively, the LSN PiF produces a bright near-white light (0.3323,0.346) at a blue laser of 5.6 W, with corresponding luminous efficiency up to 195 lm/W. Moreover, LSN PiF can maintain about 80 % of the initial luminous intensity after continuous lighting for 24 h at the incident power of 3.5 W. These outstanding properties can advance the development of LSN phosphors in high power laser lighting applications.
研究领域:
材料科学
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光学
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光子学
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照明技术
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Chengzhi Wang,Zhenbang Tian,Weiqing Huang,Jingyuan Hu,Xing Xing
Owing to the different reaction properties and deactivation mechanisms caused by the structural discrepancy of monolithic catalysts, abundant scientific results of powder or granular NH 3 -SCR catalysts have still not sufficiently robustly applied in recent years. Furthermore, minimal research has been focused on monolithic catalysts. As a result, this work prepared monolithic Mn-Fe-Ce/Al 2 O 3 catalysts by active component impregnation (ACI-Mn-Fe-Ce/Al 2 O 3 ) and precursor impregnation methods (PI-Mn-Fe-Ce/Al 2 O 3 ) and investigates the long-term SO 2 and H 2 O resistance of the catalysts. Compared with the PI-Mn-Fe-Ce/Al 2 O 3 catalyst, the monolithic ACI-Mn-Fe-Ce/Al 2 O 3 catalyst showed better performance. The catalytic activity follows a bell-shaped curve with an optimal performance at a drug loading of 5 %. The ACI-Mn-Fe-Ce/Al 2 O 3 catalyst exhibits long-term resistance to SO 2 and H 2 O and can still convert more than 70 % NO x after 168 h of SO 2 and H 2 O resistance test. Characterization of the ACI-Mn-Fe-Ce/Al 2 O 3 catalysts before and after the reaction showed that the reducibility decreased after the reaction, and more Mn 4+ was transformed into Mn 2+ to weaken the catalytic activity. However, more Fe 2+ and Ce 3+ were generated during the reaction, increasing the number of oxygen vacancies, oxygen defects, and hydroxyl-like groups, all of which would contribute to a certain extent to counteract the passivation effect of SO 2 on the catalysts. In situ DRIFTs analysis shows that the formation of surface sulfates has a minimal effect on the adsorption of NO, but it does affect the adsorption of coordinated NH 3 on Lewis acid sites. This work elucidates the deactivation details of Mn-Fe-Ce/Al 2 O 3 catalysts from the perspective of physicochemical properties, which provides a reference for the development of better low-temperature SO 2 -resistance catalysts for industrial applications.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Kunyi Ma,Lin Liu,Yanan Wang,Di Wu,Qingyu Zhao,Jinjuan Xing
In this work, a new polyvinylidene fluoride nano-ultrafiltration membrane modified by graphene oxide/ titanium dioxide doped with cerium composite materials (GO/Ce-TiO 2 -PVDF) was prepared by phase inversion method. The water contact angle, porosity, pore size distribution , and photocatalytic performance of the membrane were studied. Compared with the PVDF membrane, the water contact angle of the modified membrane decreased to 36.5°, the pure water flux improved to 119.64 L·m -2 ·h -1 , and the retention rate of bovine serum albumin (BSA) was 95.3%. The synergistic effect of GO and Ce-TiO 2 could improve the photocatalytic activity of the composite membrane , and the degradation rate of BSA was 97.4%. The flux recovery rate (FRR) of the modified membrane was 82.38%, which was 22.24% higher than that of the PVDF membrane (67.39%). The FRR of the modified membrane increased to 91.54% under water cleaning and UV irradiation. Five cycle experiments showed that the permeate flux of the polluted membrane was further restored from 78.45 L·m -2 ·h -1 to 76.95 L·m -2 ·h -1 after UV irradiation, and the retention rate of BSA was maintained at about 95%. Therefore, as predicted, the GO/Ce-TiO 2 -PVDF membrane could be widely applied in the water treatment industry due to its high anti-fouling and self-cleaning performances.
研究领域:
材料科学
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环境工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Qingmei Qiao,Yunlan Xu,Dengjie Zhong,Xihong Ke,Yuqin Yang,Hanlu Zeng
In order to enhance the carrier separation efficiency and redox ability of photoanode, a dual Z-scheme heterojunction Ce-UiO-66/g-C 3 N 4 /Bi 2 WO 6 /Ti photoanode was prepared and assembled with Cu cathode to form PFC. The characterization results show that Ce-UiO-66/g-C 3 N 4 /Bi 2 WO 6 uniformly distributed on the Ti substrate, with average crystallite size of 9.04 nm and average particle size of 33.05 nm, which provides sufficient reactive active sites for RhB degradation. The RhB degradation rate, P max , J sc , V oc and FF of the PFC were 90.9 % (90 min), 7.53 µW cm -2 , 0.152 mA cm -2 , 0.37 V and 0.134, respectively. The turnover frequency (TOF) for RhB degradation by the PFC reached 0.98 h -1 . Fermi energy level analysis shows that a double-Z heterojunction is formed between Bi 2 WO 6 and g-C 3 N 4 , and between Bi 2 WO 6 and Ce-UiO-66, which not only effectively separates photogenerated e - - h + , but also retains the high redox ability of the composite. Moreover, with the introduction of Ce-UiO-66, the composite photoanode has larger specific surface area and wider visible light absorption range. In addition, because of the built-in electric field, the photogenerated electrons can migrate to the surface of composite particles more easily and react with dissolved oxygen to generate more •O 2 - to participate in the degradation of RhB. This work provides a valuable reference for developing PFC photoanode with high efficiency and visible light response.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Shenghua Liu,Xiaoqian Feng,JinXin Xu,Jiaxin Wang,Yonghua Zhao,Huan Wang,Qijian Zhang
CO 2 methanation is a potential way for the re-utilization of CO 2 . MOF derivations are promising candidates for commonly used Ni-based catalysts due to their high porosity and confinement effect. Herein, we systematically investigated the synthetic pathway of Zr-MOF-derived Ni-based catalysts. It is found that Ce addition can effectively improve the thermostability, specific surface area and Ni dispersion of the derived Ni/CeO 2 -ZrO 2 catalyst. It can also enhance the adsorption of CO 2 by the generation of O v and improve CO 2 methanation activity. Calcination the MOF in inert gas leads to the formation of CNTs and amorphous carbon. Amorphous carbon results in less interaction between NiO and CeO 2 as well as low amount of O v , leading to lower catalytic activity than the catalyst calcinated in air. Compared with impregnation method, one-pot solvothermal method leads to much higher specific surface area for both MOF and derived oxides. It also benefits the uniform dispersion of NiO and higher amount of O v . Therefore, it shows better catalytic activity and is proved to be a better method for Ni introduction. In the catalysts we discussed, St-ZrCeNi (Ce addition, one-pot solvothermal method, calcination in air) shows the highest CO 2 conversion and good CH 4 selectivity due to its high specific area and more O v . It also shows good stability (>50 h) and good intrinsic activity. This research reveals the roles of several important factors in the synthesis process of Zr-MOF derived Ni-based catalysts. It also gives new insights for the design and synthesis for other MOF derived catalysts.
研究领域:
材料科学
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催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 25
·37746-37756
·
IF 0
Tian You,Han Zhitao,Li Yeshan,Zhao Hongzhe,Zeng Qingliang,Cheng Shaoshi
The selective catalytic oxidation (SCO) is an effective method for removing slipped high-concentration ammonia from NH 3 -fueled engine exhaust gas. Herein a novel bifunctional catalyst was synthesized by mechanically mixing sulfated Ce/ZrO 2 (Ce/ZrO 2 -S) with a small fraction of Pt/Al 2 O 3 (Pt 0.1 wt.%) for SCO of NH 3 . As expected, the introduction of a small amount of Pt/Al 2 O 3 significantly improved NH 3 conversion ability of Ce/ZrO 2 -S catalysts toward low-temperature direction. When the mass ratio of Pt/Al 2 O 3 to Ce/ZrO 2 -S was 7.5% (the corresponding mixed catalyst was denoted as P@CZS-7.5), T 90 temperature was 312 °C. More importantly, P@CZS-7.5 catalyst exhibited a much better N 2 selectivity (> 96%) in a wide temperature range (320 ~ 450 °C). H 2 -TPR results revealed that the addition of a trace amount of Pt/Al 2 O 3 significantly led to a distinct shift of reduction temperature peak toward low-temperature direction, thereby greatly improved the low-temperature redox performance of mixed catalysts. Furthermore, NH 3 -TPD and BET results showed that P@CZS-7.5 catalyst exhibited a similar NH 3 adsorption capacity to Ce/ZrO 2 -S catalyst, while the former had a relatively higher specific surface area than the latter. It was considered as a crucial factor for P@CZS-7.5 catalyst maintaining superior N 2 selectivity in high-concentration NH 3 (5000 ppm) removal processes. In situ DRIFTS results indicated that P@CZS-7.5 catalyst followed the internal selective catalytic reduction (i-SCR) mechanism in NH 3 -SCO reactions.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
FOOD CHEMISTRY
·
2023
·
IF 8.8
Haohong Lai,Pingtao Ming,Maoqiang Wu,Shumei Wang,Duanping Sun,Haiyun Zhai
In this research, a signal-off electrochemical aptasensor with high sensitivity was constructed for trace detection of zearalenone (ZEN). Specifically, Ce-based metal–organic framework and multi-walled carbon nanotubes nanocomposite was functionalized with polyethyleneimine ( [email protected] ) and served as sensing platform for its high surface area and excellent electrochemical active. Subsequently, toluidine blue (TB) was electrodeposited as the signal probe, and [email protected] nanoparticles ( [email protected] ) were dropped for the attachment of aptamer (ZEA). In the presence of ZEN, the ZEA would specifically recognize and combine with the target, causing a decrease of electrochemical signal from TB. Under the optimal conditions, the aptasensor exhibited good linear relationship for ZEN in a concentration range from 5.0 × 10 −5 to 50.0 ng/mL, while the limit of detection (LOD, S/N = 3) and limit of quantitation (LOQ, S/N = 10) were 1.0 × 10 −5 ng/mL and 2.9 × 10 −5 ng/mL, respectively. Ultimately, the aptasensor was successfully applied into ZEN detection in semen coicis real samples.
研究领域:
分析化学
·
食品安全
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Zhi Chen,Zhi-Bo Zhang,Jun Zeng,Zhi-Jie Zhang,Shan Ma,Cong-Ming Tang,Jun-Qiang Xu
In this work, a polyethyleneimine-modified chitosan/Ce-UIO-66 composite hydrogel (PEI-CS/Ce-UIO-66) was prepared using the ex-situ blend method. The synthesized composite hydrogel was characterized by SEM, EDS , XRD, FTIR, BET, XPS, and TG techniques, while the zeta potential was recorded for sample analysis. The adsorbent performance was studied by conducting adsorption experiments using methyl orange (MO), which showed that PEI-CS/Ce-UIO-66 exhibited excellent MO adsorption properties (900.5 ± 19.09 mg/g). The adsorption kinetics of PEI-CS/Ce-UIO-66 could be explained by the pseudo-second-order kinetic model , and its isothermal adsorption followed the Langmuir model. Thermodynamics showed that the adsorption was spontaneous and exothermic at low temperatures. MO could interact with PEI-CS/Ce-UIO-66 via electrostatic interaction , π–π stacking, and hydrogen bonding . The results indicated that the PEI-CS/Ce-UIO-66 composite hydrogel could potentially be used for the adsorption of anionic dyes.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Fengjiao Lai,Feng Yan,Pengju Wang,Fan Qu,Xuehua Shen,Zuotai Zhang
Efficient conversion of biomass-derived carbohydrates to alkyl levulinates is an important goal of biorefinery process, but is still challenging on applicable catalyst. Ce–Si pillared montmorillonite (CeSiM) clay heterostructures , incorporated with Wells-Dawson tungstophosphoric acid (H 6 P 2 W 18 O 64 , DPW), were prepared for the first time and used as the multifunctional catalyst for direct production of ethyl levulinate (EL) from various biomass-derived sugars. The DPW introduced by sol-gel method (DPW-CeSiM) has been effectively incorporated into the framework of porous CeSiM, while part of DPW was just absorbed on the surface of CeSiM by impregnation method (DPW-CeSiM-I). The DPW-CeSiM catalyst has large specific surface area owing to the insertion of Ce–Si pillars, and possesses strong Brønsted acidity and moderate Lewis acidity originated from the incorporated DPW and the Ce-doping, respectively. Due to the well synergistic effect of porous structure and dual acid, the DPW-CeSiM catalyst efficiently catalyzed the conversion of glucose into EL with 56.2% yield and nearly 100% conversion at 170 °C for 4 h. The recyclability studies certified that DPW-CeSiM catalyst showed higher stability than DPW-CeSiM-I over cycles and could be easily recovered from consecutive alcoholysis of biomass-derived sugars. The DPW-CeSiM catalyst also displayed high activity toward the conversion of other biomass-derived carbohydrates (fructose, sucrose, cellobiose and cellulose) into EL. Therefore, this work provides an instructive strategy for the design of efficient and stable DPW-based catalysts with dual acid sites uniformly distributed over the porous structure, which is obviously potential for industrial production of alkyl levulinates from carbohydrates and biomass.
研究领域:
化学工程
·
生物质能
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）