Scientific Reports
·
2015
·Vol. 5
·期 1
·1-8
·
IF 5.578
Niu Xiaoyu,Zhao Tieying,Yuan Fulong,Zhu Yujun
The hollow CuO@SiO 2 spheres with a mean diameter of 240 nm and a thin shell layer of about 30 nm in thickness was synthesized using an inorganic SiO 2 shell coating on the surface of Cu@C composite that was prepared by a two-step hydrothermal method. The obtained hollow CuO@SiO 2 spheres were characterized by ICP-AES, nitrogen adsorption-desorption, SEM, TEM, XRD, H 2 -TPR, CO-TPR, CO-TPD and NO-TPD. The results revealed that the hollow CuO@SiO 2 spheres consist of CuO uniformly inserted into SiO 2 layer. The CuO@SiO 2 sample exhibits particular catalytic activities for CO oxidation and NO + CO reactions compared with CuO supported on SiO 2 (CuO/SiO 2 ). The higher catalytic activity is attributed to the special hollow shell structure that possesses much more highly dispersed CuO nanocluster that can be easy toward the CO and NO adsorption and the oxidation of CO on its surface.
研究领域:
材料化学
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催化化学
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纳米材料科学
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环境催化
·
无机合成
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Bingke Xie,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Previously, many methods have been used to reduce NOx pollution. Semiconductor photocatalytic oxidation technology has been widely used among those methods because of its environmental friendliness, high efficiency, and simple implementation. Hybrid halide perovskites with exceptional optical properties prove to be promising photocatalysis material; however, their high surface energy, unpaired bonds, and instability are obstacles to large-scale application. In this work, FAPbBr 3 /g-C 3 N 4 heterostructures were successfully synthesized by growing FAPbBr 3 nanocrystals on 2D g-C 3 N 4 nanosheets. Compared with the pristine elements, FAPbBr 3 /g-C 3 N 4 composites show significant NO removal efficiencies under 600 ppb concentration at room temperature. The high performance could be attributed to the formation of a type-II heterojunction and accelerated the separation and transfer of electrons and holes. Furthermore, cycling experiments and XRD results verify that the FAPbBr 3 /g-C 3 N 4 heterojunction owns good stability. Thus, this work not only shows the great potential prospect of halide perovskite for the photocatalysis field, but also demonstrate its promise in solving energy issues and environment science.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Jing Hu,Haiqiang Wang,Fan Dong,Zhongbiao Wu
Photothermal effect was for the first time utilized to capture the energy from infrared light and to promote the photocatalytic oxidation activity of NO by a simply mechanical mixing of traditional photocatalysts and core-shell structured Fe 3 O 4 @SiO 2 . Fe 3 O 4 @SiO 2 absorbed the infrared light, transferred it into thermal energy based on photothermal effect, which then accelerated the NO photocatalytic activity of traditional photocatalysts. This promotion effect led by the addition of Fe 3 O 4 @SiO 2 was confirmed by several classical photocatalysts such as TiO 2 , g-C 3 N 4 , BiOI and CeO 2 . To quantitatively characterize the photothermal effect, thermo images were taken with a thermo imager to obtain the average temperature rise of samples under the illumination of simulated solar light. Specially, P25/Fe 3 O 4 @SiO 2 was studied in depth for illustration of the promotion mechanism. Experimental results showed that with the contribution of SiO 2 shell, the photocorrosion of Fe 3 O 4 didn’t occur during photocatalytic oxidation process and the photothermal effect of Fe 3 O 4 was maintained. The quantity of Fe 3 O 4 @SiO 2 was a vital factor for promotion of photocatalytic activity and the optimum mass ratio of P25 and Fe 3 O 4 @SiO 2 was 3–1. After 120 min of illumination, the temperature of optimum P25/Fe 3 O 4 @SiO 2 rose to 57.4 °C from 25 °C and its NO conversion capability showed an enhancement of 38.9% with the comparison to pure P25. The experimental results confirmed that the rise of temperature was attributed to the photothermal effect and its contribution was the same as the directly heating of photocatalysts. Furthermore, the enhancement of NO conversion capability around 30–40% was observed for the Fe 3 O 4 @SiO 2 mixed anatase TiO 2 , g-C 3 N 4 , ZnO, BiOI and CeO 2 . In sum, we developed a new strategy for utilization of NIR light of solar energy to facilitate the photocatalytic reactions.
研究领域:
环境科学
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材料科学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jiaoping Si,Hongjing Liu,Wendong Zhang,Dengyu Jiao,Wangxing Ai,Yuerui Ma,Lihuan Feng,Xing’an Dong,Wenjie He,Peng Chen
The catalytic conversion of nitrogen oxides (NO x ) to non-toxic products has emerged as a critical strategy for air pollution control under stringent emission regulations. Photocatalytic NO x removal performance highly depends on the transmission of photogenerated electrons and the amount of reactive oxygen species (ROS) generated. Herein, the Bi/BiOCl/SrTiO 3 heterostructure photocatalyst was prepared by a simple in situ synthesis method to address the limitations of conventional NOx removal systems. Due to the synergistic effect of bismuth (Bi) surface plasmon resonance (SPR) and the built-in electric field in BiOCl/SrTiO 3 S-scheme heterojunction, Bi/BiOCl/SrTiO 3 showed strong light absorption ability and high charge separation efficiency, with the highest NO removal efficiency reaching 70 %. The enhanced electronic interaction between Bi and BiOCl/SrTiO 3 induced Bi-O covalent bonds with the BiOCl layer to facilitate fast charge separation, promoting the rapid transfer of interfacial photogenerated carriers, this process induces the activation of O 2 and H 2 O to form reactive oxygen species (ROS) to promote the oxidative removal of NO. This study provides new insights into the development of effective photocatalysts with fast charge separation by synergistic metal active sites and built-in electric field of heterojunction for air pollutant purification.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Wei Zhu,Peijue Liu,Shuning Xiao,Wenchao Wang,Dieqing Zhang,Hexing Li
A novel Ag-doped MOF-like organotitanium polymer (Ag@NH 2 -MOP(Ti)) was synthesized via a microwave-assisted coordination and polymerization reaction with 2-aminoterephthalic acid (H 2 ATA) and tetra- n -butyl titanate (Ti(OC 4 H 9 ) 4 ), followed by the crystal growth and assembly onto Ag nanoparticles (NPs). This Ag@NH 2 -MOP(Ti) exhibited excellent activity in visible-light driven photocatalytic NO oxidization, much higher than N -doped TiO 2 by two times. The NH 2 -MOP(Ti) absorbed visible lights to generate photoelectrons and holes, accompanied by producing HO and O 2 − active sites for the subsequent NO oxidation into NO 3 − . The Ag NPs allowed assembly of NH 2 -MOP(Ti) polymer favoring light absorbance via multiple reflections and also facilitated photoelectrons transfer to reduce photoelectron–hole recombination, leading to the enhanced photocatalytic activity for NO oxidation and inactivating bacteria. Moreover, it could be used repetitively owing to the high stability.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2025
·
IF 6.8
Saiying Han,Ling Liu,Lilei Wang,Jin Han,Yeru Ai,Huali Wang,Kaifang Zeng,Jian Ming,Lili Deng
Prunus salicina ‘Wushan plum’ is a climacteric fruit, which rapidly ripens under the action of ethylene after harvesting, resulting in quality deterioration that seriously restricts the sustainable development of the industry. In order to examine the potential role of sodium hydrosulfide (NaHS, the donor of exogenous H 2 S) in slowing down the ripening and senescence process of plum fruit, the changes in storage quality, antioxidant capacity, endogenous signals and gene expression levels were evaluated during storage at 25 °C for twelve days. The results indicated that NaHS treatment delayed the coloration of plum fruit and maintained higher firmness, titratable acid content (TA) and marketable fruit rate. Treatment with NaHS increased the activities of catalase (CAT), superoxide dismutase (SOD), glutathione reductase (GR) and ascorbate peroxidase (APX); promoted the accumulation of total phenols (TP) and ascorbic acid (AsA), and inhibited the increase in reactive oxygen species (ROS), malondialdehyde (MDA) and lipoxygenase (LOX) activity, which in turn alleviated oxidative damage. H 2 S treatment down-regulated the expression of PsACO1 and PsACS1 and inhibited the production of ethylene; up-regulated the expression of PsSiR , PsSAT , PsOASTL, and PsLCD , which in turn elevated the activities of sulfite reductase (SiR), serine acetyltransferase (SAT), O-acetylserine cleavage lyase (OASTL), and L-cysteine desulfurylase (LCD), and facilitated the accumulation of the endogenous H 2 S content; up-regulated the expression of L-Arginine synthesis-related genes and PsNOA , which increased the content of L-Arginine as well as the activity of nitric oxide synthase (NOS) and facilitated the synthesis of nitric oxide (NO). The above results indicated that NaHS could improve the antioxidant system, endogenous H 2 S, ethylene, and NO metabolism of plum, thus maintaining the storage quality of the fruit.
研究领域:
植物生理学
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食品科学
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Shuo Yang,Nan Wang,Xiao–kun Ouyang,Yiwei Wu,Junhua Hu
Infection and inflammation are key factors affecting wound healing. Hydrogels are excellent wound dressings that provide a moist healing environment and serve as carriers for drugs or functional components. This work proposes a composite hydrogel, APLCE, composed of methyl methacrylate L-arginine (M-L-Arg) as an NO donor, synthesized through free radical polymerization with acrylamide (AM) and polyethylene glycol (PEG). The hydrogel matrix exhibits good water retention and mechanical properties. CaO 2 and ε-poly-L-arginine (EPL) are embedded in the hydrogel to form APLCE, where the hydrolysis of CaO 2 releases H 2 O 2 , triggering the release of arginine to release NO, inhibiting wound inflammation and bacterial growth. EPL added to the hydrogel synergistically with NO exhibits an antibacterial effect, with a bacterial inhibition rate exceeding 99 %. Animal experiments show that APLCE can completely eradicate bacteria in infected wounds, promote new skin formation, and achieve a wound closure rate of 94 % within 14 days. These findings emphasize the potential clinical application of APLCE as an innovative wound dressing material.
研究领域:
材料科学
·
生物医学工程
·
药学
·
伤口愈合
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuerui Ma,Peng Chen,Jiazhen Liao,Xing’an Dong,Wenjie He,Wendong Zhang
Selective photocatalytic oxidation of NO to nitrate (NO 3 – ) over toxic NO 2 remains challenging due to low selectivity and inefficient charge migration in existing systems. This study introduces Fe 3+ as an electron acceptor beneath a Bi 4 TaO 8 Cl/Bi 2 O 2 CO 3 heterojunction to precisely regulate electron pathways and promote targeted hydroxyl radical ( • OH) generation. Combined experimental and DFT analyses reveal Fe 3+ ’s dual role: enhancing interfacial electron transfer and activating H 2 O at surface sites to form • OH. The optimized heterojunction achieves 68.19 % NO conversion with minimal NO 2 selectivity (10.98 %). ESR and ROS quenching confirm Fe 3+ -driven electron migration enriches surface holes, boosting H 2 O adsorption and • OH production (2.76-fold increase). The strong oxidation capacity of • OH suppresses NO 2 formation, favoring complete NO oxidation to NO 3 – . This work provides a strategic approach for selective NO removal by electron-pathway engineering, advancing the design of eco-friendly photocatalysts for air pollution control.
研究领域:
环境化学
·
光催化
·
材料科学
·
化学工程
·
大气污染控制
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Junli Nie,Gangqiang Zhu,Weibin Zhang,Jianzhi Gao,Peng Zhong,Xiaotao Xie,Yu Huang,Mirabbos Hojamberdiev
Flower-like n -type CeO 2-δ is hybridized with p -type β-Bi 2 O 3 nanoparticles to design a novel β-Bi 2 O 3 /CeO 2-δ p - n heterojunction photocatalyst via a thermal treatment process of Bi/Ce(CO 3 )(OH) precursor. The synthesized β-Bi 2 O 3 /CeO 2-δ exhibits a remarkable enhancement in NO removal and significant suppression of toxic intermediates nitrogen dioxide (NO 2 ) under visible light irradiation. The superior photocatalytic activity of β-Bi 2 O 3 /CeO 2-δ for NO removal is mainly derived from the synergistic effects of the oxygen vacancies (OVs) and p-n heterojunction. The OVs not only enhance the visible light utilization and boost the separation of electron-hole pairs but also improve the adsorption and activation of NO and O 2 . Particularly, the p-n heterojunction is beneficial for the interfacial migration of photogenerated charge carriers. Electron spin resonance (ESR) and trapping experiment reveal that the synergistic effects of OVs and p-n heterojunction can induce the generation of more active species. The electrochemical measurements and density-functional theory (DFT) calculations in-depth confirm that both p-n heterojunction and OVs can accelerate the interfacial charge transfer, resulting in the deep oxidation of reactants. Therefore, the flower-like β-Bi 2 O 3 /CeO 2-δ p-n heterojunction photocatalyst exhibits an advanced photocatalytic activity for deep NO removal and a suppressed NO 2 generation. In addition, monitoring the reaction products by in situ Fourier transform infrared spectrum (FTIR) further validates that the main products of nitrates are formed during the photocatalytic process. This work demonstrates a straightforward approach for construction of p-n heterojunction photocatalysts, which can enhance the effective photocatalytic activity and stability for NO removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Xiaoqiang Wang,Yue Liu,Weiyuan Yao,Zhongbiao Wu
In this paper, a series of Sb modified CeZr 2 O x mixed oxides (Sb y CZ) were synthesized by citrate method for the selective catalytic reduction of NO with ammonia (NH 3 -SCR). Experimental results exhibited that the Sb addition could bring a great improvement of SCR activity at 200–360 °C owing to the enhancement in surface area , redox ability and surface acidity . More importantly, the sulfur tolerance of the catalyst with proper Sb loading contents was dramatically improved. For instance, above 85% deNO x efficiency was retained over Sb 0.5 CZ catalyst after 24 h reaction in the presence of 100 ppm SO 2 and 5 vol.% H 2 O. As for pure CeZr 2 O x and the catalysts with low Sb loading contents, the serious accumulation of ammonium sulfates resulted in the deactivation after SO 2 exposure. However, with excessive Sb addition, more labile oxygen readily reacted with SO 2 and the redox cycle was then disrupted, leading to the decrease of SCR activity. With an appropriate Sb loading contents, the sulfate species preferentially formed around Sb cations could restrain the further consumption of oxygen species in Ce-O-Ce or Ce-O-Zr mode by SO 2 via a space confinement effect. Thus, a certain amount of labile oxygen was preserved to drive the SCR reaction, thereby enhancing the sulfur tolerance of the catalyst.
研究领域:
催化
·
环境化学
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2018
·Vol. 8
·期 12
·642
·
IF 3.465
Yan Gao,Tao Luan,Mingyang Zhang,Wenke Zhang,Wenchen Feng
A series of Mn−Fe−Ce−Ox/γ-Al2O3nanocatalysts were synthesized with different Mn/Fe ratios for the catalytic oxidation of NO into NO2and the catalytic elimination of NOxvia fast selective catalytic reduction (SCR) reaction. The effects of Mn/Fe ratio on the physicochemical properties of the samples were analyzed by means of various techniques including N2adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2-temperature-programmed reduction (TPR), NH3-temperature-programmed desorption (TPD) and NO-TPD, meanwhile, their catalytic performance was also evaluated and compared. Multiple characterizations revealed that the catalytic performance was highly dependent on the phase composition. The Mn15Fe15−Ce/Al sample with the Mn/Fe molar ratio of 1.0 presented the optimal structure characteristic among all tested samples, with the largest surface area, increased active components distributions, the reduced crystallinity and diminished particle sizes. In the meantime, the ratios of Mn4+/Mnn+, Fe2+/Fen+and Ce3+/Cen+in Mn15Fe15−Ce/Al samples were improved, which could enhance the redox capacity and increase the quantity of chemisorbed oxygen and oxygen vacancy, thus facilitating NO oxidation into NO2and eventually promoting the fast SCR reaction. In accord with the structure results, the Mn15Fe15−Ce/Al sample exhibited the highest NO oxidation rate of 64.2% at 350 °C and the broadest temperature window of 75–350 °C with the NOxconversion >90%. Based on the structure–activity relationship discussion, the catalytic mechanism over the Mn−Fe−Ce ternary components supported byγ-Al2O3were proposed. Overall, it was believed that the optimization of Mn/Fe ratio in Mn−Fe−Ce/Al nanocatalyst was an extremely effective method to improve the structure–activity relationships for NO pre-oxidation and the fast SCR reaction.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiangsen Xu,Jiangxiao Qiao,Shibo Yu,Jiahao Chen,Yiqing Zeng,Feng Zhang,Zhaoxiang Zhong,Weihong Xing
The rational design of catalysts and the establishment of uniform filter structure are key points in the development of high-performance catalytic filters. To resolve the issue of increased N 2 O concentration in catalysts with high vanadium content at high temperatures, a range of catalytic filters with low vanadium loading were fabricated by partially substituting vanadium in 6VWTi catalysts with transition metals (Mn, Cu, Co and Ce). The experimental results show that the introduction of Ce, which leads to rich surface-adsorbed reactive oxygen species, good redox properties and appropriate surface acidity, thus the 1V5CeWTi/SiC catalytic filter exhibits the highest denitration efficiency (NO conversion ＞90 % at the temperature of 300–500 °C without N 2 O production), presenting significant advantages in contrast to 1VWTi/SiC and 6VWTi/SiC. Furthermore, the preparation technology was optimized to obtain a more uniform structure, which enhanced NH 3 -SCR performance and reduced filter pressure drop. The optimized 1V5CeWTi/SiC also exhibited exceptional resistance to SO 2 + H 2 O and long-term stability for a duration of 200 h at 300 °C, as well as displays a noteworthy efficiency in filtering particulate matter (10 μm SiO 2 ). Therefore, the optimized 1V5CeWTi/SiC catalytic filter holds great potential in the realm of gas purification.
研究领域:
环境工程
·
催化
·
材料科学
✓ 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）