ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·Vol. 30
·期 19
·56188-56197
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IF 5.8
Chen Jingwen,Wu Menglin,Ni Jiupai,Ni Chengsheng
Photocatalysis using the visible light of the sun is an environmentally friendly method of eliminating the NOx pollutant from the ambient air. Although Cs 3 Bi 2 Br 9 , a semiconductor with a band gap of 2.54 eV, may be a strong absorber of visible light, its photocatalysis towards the abatement of NOx is unknown. In this study, Cs 3 Bi 2-x Pb x Br 9-x (0 ≤ x ≤ 0.0789) are used for the photocatalytic oxidation of NOx. A significant NO oxidation efficiency (80%) is observed over Cs 3 Bi 2-x Pb x Br 9-x (x = 0.0443) under visible light, which is attributable to the Br vacancy ( V Br ) brought about by Pb 2+ doping. The presence of V Br increased the ionic selectivity of in the oxidized NO. At higher Pb doping level, two HONOs adsorbed on the V Br , linked, and then reduced by hot electrons to produce N 2 O 2 2− . The di-azo coupling could passivate the activation of NO on the V Br . This work advances the defect engineering of halide for the photo-driving solid–gas reaction in air.
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International Journal of Environmental Research and Public Health
·
2023
·Vol. 20
·期 5
·4009
·
IF 4.614
Han Chen,Yutao Hu,Zanyun Ying,Yinfeng Xia,Jiexu Ye,Jingkai Zhao,Shihan Zhang
The efficient, stable, and selective photocatalytic conversion of nitric oxide (NO) into harmless products such as nitrate (NO3−) is greatly desired but remains an enormous challenge. In this work, a series of BiOI/SnO2heterojunctions (denoted asX%B-S, whereX% is the mass portion of BiOI compared with the mass of SnO2) were synthesized for the efficient transformation of NO into harmless NO3−. The best performance was achieved by the 30%B-S catalyst, whose NO removal efficiency was 96.3% and 47.2% higher than that of 15%B-S and 75%B-S, respectively. Moreover, 30%B-S also exhibited good stability and recyclability. This enhanced performance was mainly caused by the heterojunction structure, which facilitated charge transport and electron-hole separation. Under visible light irradiation, the electrons gathered in SnO2transformed O2to ·O2−and ·OH, while the holes generated in BiOI oxidized H2O to produce ·OH. The abundantly generated ·OH, ·O2−, and1O2species effectively converted NO to NO−and NO2−, thus promoting the oxidation of NO to NO3−. Overall, the heterojunction formation between p-type BiOI and n-type SnO2significantly reduced the recombination of photo-induced electron-hole pairs and promoted the photocatalytic activity. This work reveals the critical role of heterojunctions during photocatalytic degradation and provides some insight into NO removal.Keywords:NO removal;photocatalysis;BiOI/SnO2;heterojunction;enhanced mechanism
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JOURNAL OF CONTROLLED RELEASE
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2022
·
IF 11.467
Jie He,Pan Ran,Maohua Chen,Wenxiong Cao,Shuang Xie,Guiyuan Zhang,Xiaohong Li
Bacteria have the ability to invade and survive in host cells to form intracellular bacteria (ICBs), and challenges remain in the intracellular delivery of sufficient antibiotics to remove ICBs. Herein, antimicrobial peptide of epsilon-poly- l -lysine (ePL) and nitric oxide (NO) donors are integrated into nanoparticles (NPs) for ICB treatment without using any antibiotics. ePL was grafted with dodecyl alcohol through ethyl dichlorophosphate to prepare ePL-C 12 , followed by conjugation of nitrate-functionalized NO donors to obtain ePL-C 12 NO. PNO/C NPs were prepared from mixtures of ePL-C 12 NO and ePL-C 12 and the optimal ePL-C 12 NO ratio was 7% in terms of bactericidal effect and macrophage toxicity. Once being engulfed by bacteria-infected macrophages (BIMs), NPs are disintegrated when encountering with ICB-secreted phosphatase , and the NP degradation accelerates intracellular NO release in response to the elevated glutathione levels in BIMs. The selective and abrupt release of NO and ePL with different antimicrobial mechanisms exhibits synergistic eradication of ICBs and no apparent toxicity to macrophages. ICB-infected mice show persistent weight loss and 100% of mortality rate after treatment with ePL-C 12 NPs for 7 days, while PNO/C treatment causes entire survival of infected mice and full recovery of body weights to normal values. ICB-infected mice are also accompanied with apparent hepatomegaly and splenomegaly , which are only eliminated by PNO/C treatment without associated any pathological abnormality. PNO/C treatment reduces bacterial burdens in livers (2.45 log), spleens (2.16 log) and kidneys (3.46 log) and restores hepatic and renal function to normal levels. Thus, this study provides a feasible strategy to selectively release NO and cationic peptides in response to intracellular infection-derived signals, achieving synergistic eradication of ICBs and function restoration of the main tissues.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-11
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IF 17.694
Zhang Xiangxiang,Li Chao,Liu Fukai,Mu Wei,Ren Yongshuo,Yang Boyu,Han Xiaojun
Bottom-up synthesis of prototissues helps us to understand the internal cellular communications in the natural tissues and their functions, as well as to improve or repair the damaged tissues. The existed prototissues are rarely used to improve the function of living tissues. We demonstrate a methodology to produce spatially programmable prototissues based on the magneto-Archimedes effect in a high-throughput manner. More than 2000 prototissues are produced once within 2 h. Two-component and three-component spatial coded prototissues are fabricated by varying the addition giant unilamellar vesicles order/number, and the magnetic field distributions. Two-step and three-step signal communications in the prototissues are realized using cascade enzyme reactions. More importantly, the two-component prototissues capable of producing nitric oxide cause vasodilation of rat blood vessels in the presence of glucose and hydroxyurea. The tension force decreases 2.59 g, meanwhile the blood vessel relaxation is of 31.2%. Our works pave the path to fabricate complicated programmable prototissues, and hold great potential in the biomedical field.
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ENERGY & FUELS
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2023
·
IF 5.3
Xiao Tan,Yiming Zhou,Suitao Qi,Guangxu Cheng,Chunhai Yi,Bolun Yang
As one of the important atmospheric pollutants, the removal of NO in flue gas at low temperatures is still a severe challenge. Selective catalytic reduction (SCR) with urea is an effective method for NO removal at low temperatures. Herein, through directly loading urea, an Fe-modified Mn-based molecular sieve catalyst with good low-temperature urea-SCR activity was prepared by a stepwise impregnation method. The results show that with a mass ratio of Mn/Fe of 10:0.5 and a calcination temperature of 500 °C, the catalyst loaded with 15 wt % urea had the highest catalytic activity of 98.5% at 250 °C. Online mass spectrometry results show that NH3 formed from the decomposition of urea reacts with NO when the temperature is above 150 °C, while urea directly reacts with NO below 150 °C. The density functional theory calculation demonstrates that the doping of Fe weakens the strength of the Mn–O bond in MnO2, which makes NO easier to combine with lattice oxygen to oxidize into NO2, thereby promoting the whole urea-SCR reaction. This work provides an overall perspective and theoretical support for the design of urea-SCR catalysts over a wide temperature range.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Hai Zhu,Wenjun Lin,Qi Li,Yin Hu,Siyu Guo,Congmin Wang,Feng Yan
The exploitation of novel porous materials for capturing/adsorption of harmful gases is considered a very promising approach to deal with air pollution. Herein, bipyridinium-based ionic covalent triazine frameworks (ICTFs) were synthesized via ZnCl2-catalyzed ionothermal polymerization. The as-prepared ICTFs had a satisfactory total pore volume and specific surface of approximately 0.4582 cm3 g–1 and 1000 m2 g–1, respectively. Moreover, the specific surface area, pore size and distribution, and total pore volumes of ICTFs could be adjusted via ion-exchange of the anion. The obtained ICTFs were explored as the adsorbent for the separation/adsorption of the mixed gases (SO2, CO2, NO, and N2), and they showed the strong adsorption ability for CO2 (2.75 mmol g–1), SO2 (9.22 mmol g–1), and NO (4.05 mmol g–1) at 1 bar and 298 K. This unique design provides a new insight to prepare high-efficiency porous materials for CO2, SO2, and NO capture.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Xiuzhen Wan,Shuai Liu,Xuanxuan Xin,Pengfei Li,Jie Dou,Xiao Han,Inn-Kyu Kang,Jiang Yuan,Bo Chi,Jian Shen
Wound repair is a dynamic and complex process that involves various interactions between repair cells, growth factors and the extracellular matrix. Nitric oxide (NO) plays a pivotal role in wound healing, including causing the contraction of wound surfaces, dilating blood vessels, participating in inflammation, and promoting collagen synthesis, angiogenesis, and fibroblast proliferation. Here, we prepared a novel keratin-based nitric oxide donor, called S-nitrosated keratin (KSNO). Then, KSNO was coelectrospun with polyurethane (PU) and gelatin (Gel) to produce PU/Gel/KSNO biocomposite mats. The prepared mats released NO without cytotoxicity, promoted the proliferation of L929 murine fibroblasts and human umbilical vein endothelial cells (HUVECs), and inhibited bacterial growth. These mats could also accelerate the cell adhesion and growth along the random arrangement of electrospun fibers, and simulate the structure of the natural extracellular matrix to provide good scaffolds for cell. The effect of PU/Gel/KSNO on promoting wound healing was investigated on a full-thickness excisional cutaneous wound model in rats. The results demonstrated that these mats accelerated wound healing without inflammatory reaction. In conclusion, PU/Gel/KSNO mats display excellent bioactivity and biocompatibility and have potential in the field of wound repair.
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ENERGY & FUELS
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2019
·
IF 3.021
Ying Sun,Minjie Gao,Shuhang Ren,Qi Zhang,Yucui Hou,Weize Wu
To explore new reversible and environmentally friendly solvents for the capture of nitric oxide (NO), a series of amine-based functional deep eutectic solvents (DESs) were designed via ammonium salts (triethylenetetramine chloride-[TETA]Cl and tetraethylenepentamine chloride-[TEPA]Cl) and polyhydric alcohols (ethylene glycol-EG, 1,3-propanediol-PG, glycerol-Gy, and polyethylene glycol 2000-PEG). All of the DESs prepared showed good absorption capacities for 10 vol % NO. EG-[TEPA]Cl DES (nEG/n[TEPA]Cl = 3:1) had the highest absorption capacity of 10 vol % NO, 0.327 g NO per g DES at 30 °C. Moreover, the EG-[TEPA]Cl DES (nEG/n[TEPA]Cl = 3:1) showed excellent reusability for at least 5 recycles. The comparison of FT-IR and UV–vis spectra of DESs before and after NO absorption was made to study the absorption mechanism. The results indicated that the absorption of NO by the DESs was mainly a chemical process. One mole of amine group in HBA could react with two moles of NO to produce R1R2N–(NO)–NO, where both R1 and R2 belong to alkyl groups. This efficient and reusable absorption of NO in the functional DESs was expected to provide a new idea for the capture of NO.
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ANALYTICA CHIMICA ACTA
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2019
·
IF 5.256
Shuang Liu,Yong-Liang Yu,Jian-Hua Wang
Long-term and multipoint monitoring is very important to evaluate the safety of water environment. Atomic fluorescence spectrometer (AFS) is generally used for analyzing metals or metalloids in water quality monitoring. In the present work, for the first time, AFS is employed for sensitive monitoring of nitrogen nutrients, i.e., NO 2 − , NO 3 − and NH 4 + , with nitric oxide (NO) vapor generation. By taking advantage of the different vapor generation conditions for NO 2 − , NO 3 − and NH 4 + , a unit integrating with sampling, heating, cooling, gas-liquid separation and moisture removal is employed for controlling the vapor generation process, by reacting with either iodide or titanium (III). An antimony hollow cathode lamp is used for the excitation of NO to produce fluorescence emission at 193–320 nm. Linear calibration graphs are obtained within 0.02–2, 0.1–20, 0.2–1 mg L −1 for NO 2 − , NO 3 − and NH 4 + , along with detection limits of 0.006, 0.03, 0.06 mg L −1 , respectively. The new analytical strategy obviously broadens the application of AFS, and it is well demonstrated by the determination of NO 2 − , NO 3 − and NH 4 + in certified reference materials as well as various real water samples, providing competitive sensitivity with the current techniques for nutrient monitoring in environmental water.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yi Zhao,Han Wang
Three kinds of chemically modified silica were prepared to adsorb NO by surface modifying with vinyltriethoxysilane, acrylic acid and acryl amide respectively, and characterized by N 2 adsorption experiments, Fourier transform infrared spectroscopy, scanning electron microscopy and thermo-gravity analysis. The results showed that COOH and CONH 2 in the monomers had been grafted on the silica surface, and the pore volumes of S 1 , S 2 and S 3 decreased and exhibited the mesoporous structure; all the modified adsorbents could maintain steady under 300 °C. NO adsorption experiments were also carried out and the results suggested that the silica modified with acryl amide had the best NO adsorption capacity due to the relative large surface area and the stronger hydrogen bonds between NO molecules and the functional groups. The adsorbed NO molecules could be well desorbed by purging with N 2 so that the adsorbents could be recycled and NO resource also had the chance to be reused.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 96
·期 1
·27-32
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IF 1.356
Haiqian Zhao,Xingcun Gao,Chenghao Liu,Zhonghua Wang,Hanbing Qi
Basic rules of NO oxidation by a Fe 2+ /H 2 O 2 /AA directional decomposition system were researched based on the technical background of flue gas NO x removal. Effects of gas-liquid interfacial area, main gas, and solution parameters on NO oxidation efficiency ( η ) were analyzed. The results showed that adequate contact area was the precondition for high η by a Fe 2+ /H 2 O 2 /AA system. η decreased with the increase in NO concentration, which illustrated that this method would be efficient in oxidizing NO at a low concentration. η tended to decrease linearly with the growth in gas flow, however, the NO oxidation rate ( v ) rose with the increase in NO concentration and gas flow. η increased with the initial concentrations of H 2 O 2 and Fe 2+ , but the amplitude decreased. Controlling the initial concentrations of H 2 O 2 and Fe 2+ to achieve reasonable synergies between generation rate and consumption rate of ·OH could weaken the invalid consumption of reactants. η increased with the increase in temperature in the range 30–60 °C, but it nearly did not change with temperature after 60 °C. This oxidation technology and the traditional wet flue gas desulphurization technology exhibited temperature synergy. Under typical pH of wet desulphurization, η and H 2 O 2 consumption rate did not change obviously.
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Journal of Cardiovascular Translational Research
·
2024
·
IF 2.4
Zhang Ning,Liu Liangju,Lv Xiaowang,Wang Yixuan,Zhang Wei,Wen Xin,Yu Fan,Zhou Tingting
Trimethylamine oxide (TMAO) is an intestinal flora metabolite associated with risk of cardiovascular diseases. Transient receptor potential vanilloid 4 (TRPV4) is a Ca 2+ -permeable ion channel that is essential for vasodilation and endothelial function. Currently, there are few studies on the effect of TMAO on TRPV4 channels. In the present study, Ca 2+ imaging of vascular tissue showed that TMAO inhibited TRPV4-mediated Ca 2+ influx into aortic endothelial cells in a dose-dependent manner. Furthermore, a whole-cell patch clamp assay showed that TMAO blocked TRPV4-mediated cation currents. Notably, results of aortic vascular tension measurement showed that TMAO impaired endothelium-dependent vasodilation in mouse aortic vessels through the TRPV4-NO pathway. Our results indicated that TMAO inhibited Ca 2+ entry in endothelial cells and impaired vasodilation through the TRPV4-NO pathway in mice. These results provide scientific evidence for novel pathogenic mechanisms underlying the role of TMAO in cardiovascular disease. Graphical Abstract TMAO impairs mouse aortic vasodilation by inhibiting TRPV4-NO pathway in endothelial cells.
研究领域:
药理学
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心血管生理学
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分子生物学
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