Applied Sciences-Basel
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2018
·Vol. 8
·期 12
·
IF 1.689
Xinbo Zhu,Yaolin Wang,Yu Huang,Yuxiang Cai
In this work, a series of Ce-W-Ti catalysts were synthesized using a solution combustion method for the selective catalytic reduction (SCR) of NO with NH3at low temperatures. The reaction performance of NH3-SCR of NO was significantly improved over the Ce-W-Ti catalysts compared to Ce0.4Ti and W0.4Ti catalysts, while Ce0.2W0.2Ti showed the best activity among all the samples. The Ce0.2W0.2Ti catalyst exhibited over 90% removal of NO and 100% N2selectivity in the temperature range of 250–400 °C at a gas hourly space velocity (GHSV) of 120,000 mL·g−1·h−1. The Ce-W-Ti catalysts were characterized using N2adsorption-desorption, X-ray diffraction, X-ray photoelectron spectrometry and temperature programmed desorption of NH3to establish the structure-activity relationships of the Ce-W-Ti catalysts. The excellent catalytic performance of the Ce0.2W0.2Ti catalyst could be associated with the larger specific surface area, highly dispersed Ce and W species, increased amount of surface adsorbed oxygen (Oads) and enhanced total acidity on the catalyst surfaces.
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Food Bioscience
·
2026
·
IF 6.2
Shiyu Zhang,Xinzhuan Yao,Yanxia Wang,Muhammad Safiullah Virk,Shiyu Tian,Zhenkedai Yuan,Qihong Zou,Linlin Li,Shenyuan Ye,Hu Tang,Litang Lu
This study comprehensively evaluated Baiye No.1 (BY1H), a temperature-sensitive tea cultivar. Normally, it whitens in early spring and gradually regreens in autumn, accompanied by declining free amino acids and rising catechin and caffeine levels. We reevaluated the common belief that autumn tea is inferior. The feasibility of producing premium yellow tea from autumn-harvested BY1H was assessed, and the mechanisms underlying its quality formation were elucidated. The menhuang yellowing step played a central role. Driven by non-enzymatic thermal oxidation and hydrolysis, it reduced typical autumn defects by lowering phenolic and caffeine levels and increasing sweet-tasting free amino acids. Sensory evaluation, targeted metabolite profiling, and multivariate statistics were integrated to compare BY1H with four reference yellow teas (Ya’an Yellow Tea, Weishan Maojian, Yuan’an Luyuan Yellow Tea, and Pingyang Huangtang). BY1H yellow tea exhibited superior sensory attributes for its mellow-sweet taste and layered floral bouquet. Chemically, this profile was supported by a high water-extract yield, low levels of caffeine and ester-catechins, and abundant serine and phenylalanine. Together, these components contributed to its mellow-sweet taste. Gas Chromatography-Mass Spectrometry (GC-MS) analysis further identified 18 key volatiles, among which benzaldehyde, β-ionone, and methyl 2-(2-methylpropoxy)benzoate were the major contributors to the sweet-floral aroma. Partial Least-Squares Discriminant Analysis (PLS-DA) and Mantel tests confirmed BY1H’s unique chemical signature, clearly separating it from the other traditional yellow teas. These findings demonstrate that autumn BY1H leaves can be valorized through yellow tea processing, providing a scientific basis for cultivar innovation and sustainable utilization of seasonal tea resources.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 28
·28808-28816
·
IF 2.914
Duo Yankai,Wang Xiaoping,He Jinjia,Zhang Shihan,Pan Hua,Chen Jianmeng,Chen Jun
The effect of Mn powder addition on the simultaneous removal of SO 2 and NO coupled with Fe II (EDTA) absorption was investigated in this work. In the NO absorption system with Fe II (EDTA), SO 2 reduced Fe II (EDTA)-NO to Fe II (EDTA) with a reduction efficiency reaching 88.5% under the conditions of 4000 mg/m 3 SO 2 , pH 8.0, 44 °C, and the flow rate of 1.2 L/min within 60 min. Introducing 0.1 M Mn powder with SO 2 increased the Fe II (EDTA)-NO reduction efficiency to 96.8% within 5 min. SO 2 was also removed by reducing Fe II (EDTA)-NO and converted into SO 4 2- at a removal efficiency of 100%. After adding Mn powder, NO was removed through the following reaction: \( 5\mathrm{Mn}+2{\mathrm{Fe}}^{\mathrm{II}}\left(\mathrm{EDTA}\right)-\mathrm{NO}+12{\mathrm{H}}^{+}\longrightarrow 2{\mathrm{Fe}}^{\mathrm{II}}\left(\mathrm{EDTA}\right)+5{\mathrm{Mn}}^{2+}+2{\mathrm{NH}}_4^{+}+2{\mathrm{H}}_2\mathrm{O} \) . Mn powder functioned as a reductant to regenerate the absorption of solution, and the coordinated NO in Fe II (EDTA)-NO was reduced to NH 4 + . The resource utilization rate of N reached approximately 77.2%. The integrated technology is a potential solution for flue gas treatment in industrial sectors with coal-fired power plants and industrial boiler.
Graphical abstract
研究领域:
环境工程
·
化学工程
·
污染控制技术
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Green Energy & Environment
·
2022
·
IF 12.781
Yanqin Li,Junqi Tian,Zhisong Liu,Zhongqi Liu,Dong Dong,Fu Wang,Wei Wang,Minmin Liu,Jianming Dan,Yongsheng Li,Feng Yu,Bin Dai,Yunbo Yu
Photo-assisted SCR (PSCR) offers a potential solution for removal of NO at room temperature. MnTiO x as PSCR catalyst exhibits superior performance with NO removal of 100% at the room temperature. Electron paramagnetic resonance (EPR) analysis revealed the presence of numerous oxygen vacancies on MnTiO x . Optical carrier density functional theory (DFT) calculations showed that the three-dimensional orbital hybridization of Mn and Ti is significantly enhanced under light irradiation. The MnTiO x catalyst exhibited excellent electron–hole separation ability, which can adsorbe NH 3 and dissociate to form NH 2 fragments and H atoms. In-situ diffuse reflectance infrared fourier-transform spectroscopy (DRIFTS) indicated that the optical carrier enhanced NH 3 adsorption on MnTiO x , which makes it possess excellent PSCR activity. This work provided an additional strategy to NO removal with PSCR catalysts and showed potential for use in photocatalysis.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Hongyu Zhang,Ling Chen,Baogang Xu,Ping Yang
The strong band-to-band visible light absorption obtained by changing the bandgap of photocatalysts is desirable but challenging for TiO 2 . In this paper, a mechanochemical pre-reaction and subsequent heat-treatment process were used to create TiO 2 /g-C 3 N 4 heterojunctions. Acid-treated H 2 Ti 3 O 7 nanobelts and superior thin g-C 3 N 4 nanosheets (CN) were ground evenly and further heat-treated to grow rhombic TiO 2 in situ on the nanosheets. The heterojunctions exhibited a band gap with the absorption in visible light region. Heterojunction formation effective tunes the surface and electronic structures of the composite, resulting in significant decrease of bandgap. g-C 3 N 4 -based heterojunctions (5TCN) exhibited excellent H 2 generation (4991 μmol/g/h) and NO removal. In contrast, a TiO 2 -based composite (95TCN) revealed efficient photo reduction of Cr(Ⅵ) which was 2 times of that of TiO 2 sample and 22 times of that of CN. The photochemical reaction mechanism of TiO 2 and g-C 3 N 4 -based composites was discussed with the ratio of TiO 2 and g-C 3 N 4 . The excellent performance is ascribed to single crystal rhombic TiO 2 nanoparticles grown in situ on g-C 3 N 4 to form well-developed heterojunctions which accelerate the carrier transfer. These results inspire the electronic structure engineering of photocatalysts to improve visible light absorption and provide a magic strategy for excellent photochemical activities.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Kean Chen,Binxian Chu,Qiuju Qin,Xuemei Ou,Runqi Zhao,Xiaoling Wei,Huan Wu,Bin Li,Lihui Dong
As an ideal substitute for the precious metals in the selective catalytic reduction of NO by CO, transition metal oxides perform very well. Thus, a series of CuO - Co 3 O 4 symbiotic oxide porous nanosheet catalysts are prepared with a CTAB-assisted hydrothermal method. Cu5 with the ratio of Cu and Co is 5 : 10, has the best activity on the premise of maintaining the nanosheet structure. Reduction pretreatment of Cu5 with H 2 is carried out, and the surface will be rapidly oxidized in air. In this period, Cu, CuO and Co 3 O 4 were produced and coexisted on surface. Cu5-re-163 exhibits greatly higher N 2 selectivity but a little inferior NO conversion. Further DFT calculation and characterizations proved that [N] free radicals exist during the reaction. The reaction on Cu5 and Cu-re-163 follow L-H and E-R mechanism respectively. [N] radicals on the latter are much easier to desorb, so that they are easy to combine with each other to form N 2 rather than with NO to generate N 2 O, as the reason why Cu5-re-163 has better selectivity.
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Advanced Healthcare Materials
·
2022
·Vol. 11
·期 19
·2201323
·
IF 11.092
Shuang Xie,Kun Huang,Jiawen Peng,Yuan Liu,Wenxiong Cao,Dandan Zhang,Xiaohong Li
Diabetic foot ulcer (DFU) treatment is challenged by persistent bacterial infection and hyperglycemia-caused vascular dysplasia. Herein, self-propelled nanomotors are designed to achieve biofilm microenvironment (BME)-activated multistage release of NO for effective sterilization and subsequent angiogenesis promotion. CaO 2 nanoparticles (NPs) are capped with PDA layers, followed by complexation with Fe 2+ and surface grafting of cysteine-NO to obtain Janus Ca@PDA Fe -CNO NPs. In response to low pH in BME, the decomposition of CaO 2 cores generates O 2 from one side of Janus NPs to propel biofilm penetration, and the released H 2 O 2 and Fe 2+ produce •OH through Fenton reaction. The concurrent glutathione-triggered release of NO can be converted into reactive nitrogen species, which exhibit significantly higher bactericidal efficacy than those with only generation of •OH or NO. The slow release of NO for an extended time period promotes endothelial cell proliferation and migration. On Staphylococcus aureus -infected skin wounds of diabetic mice, NP treatment eliminates bacterial infections and significantly elevates blood vessel densities, leading to full wound recovery and regeneration of arranged collagen fibers and skin accessories. Thus, the self-propelling and multistage release of NO provide a feasible strategy to combat biofilm infection without using any antibiotics and accelerate angiogenesis and wound healing for DFU treatment.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Wenyu Wang,Dejun Ding,Kunpeng Zhou,Man Zhang,Weifen Zhang,Fang Yan,Ni Cheng
Nitric oxide (NO) has emerged as a potential wound therapeutic agent due to its pivotal role in the wound healing processes. Nevertheless, NO-based therapy for clinical applications is still restricted due to its gaseous state and short half-life. Here we exploited a wound dressing by incorporating sodium nitroprusside doped prussian blue nanoparticals and Type I collagen into the chitosan/poly(vinyl alcohol) nanofibers through the electrospinning method. This hybrid nanofibrous scaffold possess the excellent abilities of NIR controlled NO release, photothermal therapy, and imitation of extra-cellular matrix-like architecture. These synergistic effects could enhance their anti-bactericidal effects in vitro and furthermore accelerate wound healing in vivo when compared to control groups. Histological analysis demonstrated the scaffold could promote fibroblast growth and accelerate epithelialization. Moreover, no apparent histological toxicology and negligible damage to major organs were observed, which provided sufficient biosafety for in vivo application. These data indicate the fabricated hybrid nanofibrous scaffold could be used as an ideal candidate for accelerating wound healing and treating chronic wounds.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Benjun Huo,Jie Yang,Yao Bian,Daofu Wu,Julin Feng,Jiaer Zhou,Qiang Huang,Fan Dong,Xiaosheng Tang
The superior optical properties and adjustable bandgap allows for hybrid halide perovskite quantum dots to be promising photocatalytic materials, but the serious radiative recombination and instability inhibit the improvement of photocatalytic conversion efficiency. Herein, we successfully synthesized the FAPbBr 3 /A-SiO 2 nanocomposites photocatalyst by anchoring formamidinium (FA + , HC(NH 2 ) 2+ ) lead halide perovskite quantum dots on aminated silica spheres to construct the composite photocatalysts via N H chemical bonding. The FAPbBr 3 /A-SiO 2 composites show the significantly enhanced visible-light-driven NO removal activity (70%) compared to the pristine FAPbBr 3 (30%) in half an hour at room temperature, revealing that the increased active sites and efficient charge carrier separation contribute to the absorption and activation of reactant molecules. This work would open the new possibilities for improving the photocatalytic ability of perovskite quantum dots.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Meijuan Chen,Xiaoyan Wei,Liaoliao Zhao,Yu Huang,Shun-cheng Lee,Wingkei Ho,Kehao Chen
Highly efficient and stable photocatalysts were synthesized at room temperature by modifying MIL-125(Ti) with N-doped carbon quantum dots (N/CM(Ti)). The N/CM(Ti) with 2.5 vol % N doped carbon quantum dots (N/CQDs) had the best light absorption and visible-light photocatalytic nitrogen oxide (NO) removal efficiency (approximately 49%). It was found through X-ray photoelectron spectroscopy analysis that a N–Ti–O bond was formed in the 2.5 vol % N/CM(Ti), which is more conducive to charge transfer. Photocurrent and electrochemical impedance data also showed that the carrier separation efficiency of 2.5 vol % N/CM(Ti) was significantly superior to that of MIL-125(Ti). In addition, the TiIII–TiIV of MIL-125(Ti) acts as the active center for photocatalytic removal of NO. Two possible electron migration paths were proposed: electron transfer from N/CQDs to TiIII–TiIV center of MIL-125(Ti) due to the photoinduced electron transfer property of N/CQDs, and absorption of UV light generated from the N/CQDs by the terephthalic acid ligand followed by electron transfer to metal active sites for photocatalytic removal of NO.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Runping Wu,Qing Ye,Kai Wu,Shuiyuan Cheng,Tianfang Kang,Hongxing Dai
The alkali metal (M = Na, K, Rb, and Cs)-modified C-FDU-15 (M-C-FDU-15( x ); x was the M/C-FDU-15 M ratio, and equal to 0.01–0.03) samples were prepared through an in situ process, and characterized by means of the TG, XRD, TEM, EDS, N 2 adsorption–desorption, O 2 -TPD, and CO 2 -TPD techniques. The (NO + O 2 ) adsorption mechanism was investigated using the (NO + O 2 )-TPD and DRIFTS techniques. The results show that the sequence of (NO + O 2 ) adsorption performance was Na-C-FDU-15(0.01) (104.1 mg/g) > K-C-FDU-15(0.01) (92.4 mg/g) > C-FDU-15 (76.2 mg/g) > Rb-C-FDU-15(0.01) (65.1 mg/g) > Cs-C-FDU-15(0.01) (62.3 mg/g). The alkali metal was uniformly distributed in C-FDU-15 and its doping enhanced the amount of the basic sites in the sample. Moreover, the optimal Na/C-FDU-15 M ratio was 0.02. (NO + O 2 ) were chemically adsorbed mainly in the forms of nitrite (NO 2 − ) and nitrate (NO 3 − ) on M-C-FDU-15( x ). A more amount of NO was converted to nitrate than to nitrite. There were three key factors of enhancing the (NO + O 2 ) adsorption capacity of C-FDU-15 due to alkali metal doping: the first factor was the increasing of surface area and pore volume of the sample, the second one was the enhancement in amount of the active sites in the sample, and the third one was the smaller alkali metal ionic radius in the sample.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Beibei Wang,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
We report an unique 2D/2D Iodine doped BiOIO 3 /g-C 3 N 4 heterojunction was successfully prepared. The iodine doped BiOIO 3 was prepared by a simple solvent exchange method and combined with g-C 3 N 4 by solvothermal method . The prepared photocatalyst has potential application value in the future due to its excellent stable cycle property. BiOIO 3 nanoplates and g-C 3 N 4 nanosheets form a close interfacial contact directly, so the catalyst has higher charge transport efficiency and wide visible range due to the introduction of iodide ions. Synergistic heterojunction exhibits strong photocatalytic activity for degradation of NO at ppb-level under visible light , of which 30% Iodine doped BiOIO 3 /g-C 3 N 4 can achieve a maximum removal rate of 57% for NO. According to the experimental results of ESR and other experiments, a more complex Z-scheme photocatalytic mechanism is proposed, which has stronger redox ability than the traditional mechanism.
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