CHINESE JOURNAL OF CATALYSIS
·
2020
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IF 6.146
Pengfei Zhu,Xiaohe Yin,Xinhua Gao,Guohui Dong,Jingkun Xu,Chuanyi Wang
The controlled introduction of oxygen vacancies (OVs) in photocatalysts has been demonstrated to be an efficient approach for improving the separation of photogenerated charge carriers, and thus, for enhancing the photocatalytic performance of photocatalysts. In this study, a two-step calcination method where ZIF-8 was used as the precursor was explored for the synthesis of ZIF-8-derived ZnO nanoparticles with gradient distribution of OVs. Electron paramagnetic resonance measurements indicated that the concentration of OVs in the samples depended on the temperature treatment process. Ultraviolet–visible spectra supported that the two-step calcined samples presented excellent light-harvesting ability in the ultraviolet-to-visible light range. Moreover, it was determined that the two-step calcined samples presented superior photocatalytic performance for the removal of NO , and inhibited the generation of NO 2 . These properties could be attributed to the contribution of the OVs present in the two-step calcined samples to their photocatalytic performance. The electrons confined by the OVs could be transferred to O 2 to generate superoxide radicals, which could oxidize NO to the final product, nitrate. In particular, the NO removal efficiency of Z 350-400 (which was a sample first calcined at 350 °C for 2 h, then at 400 °C for 1 h) was 1.5 and 4.6 times higher than that of Z 400 (which was one-step directly calcined at 400 °C) and commercial ZnO, respectively. These findings suggested that OV-containing metal oxides that derived from metal-organic framework materials hold great promise as highly efficient photocatalysts for the removal of NO.
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FUEL
·
2023
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IF 7.4
Yuheng Qiao,Zhenzhen Guan,Mengyan Zhang,Gan Chen,Shifeng Zhou,Hailong Liu,Jiang Wu,Ruitang Guo,Weiguo Pan,Fangqin Li,Ping He
In this paper, a series of Fe-based catalysts with Zeolite Socony Mobil-5 (ZSM-5) as supports were synthesized using the sol–gel method to obtain the Fe/ZSM-5, Mn-Fe/ZSM-5, Cu-Fe/ZSM-5 and Cu-Mn-Fe/ZSM-5 catalysts. The synthesized catalysts were examined and characterized via catalytic activity testing, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption/desorption, scanning electron microscope (SEM), temperature-programmed desorption of NH 3 (NH 3 -TPD), temperature-programmed reduction with H 2 (H 2 -TPR) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results showed that the Cu-Mn-Fe/ZSM-5 catalyst had the best catalytic performance compared with the other catalysts. In addition, Fe/ZSM-5 and Cu-Mn-Fe/ZSM-5 all exhibited excellent stability as well as good tolerance to SO 2 & H 2 O under the experimental conditions. Further characterization results showed that with co-doping of Cu and Mn, the amount of Mn 4+ , Cu + , Fe 3+ and surface chemisorbed oxygen (O β ) on the surface of Fe/ZSM-5 increased, promoting the catalytic performance. The DRIFT studies revealed that the NH 3 -SCR reaction followed both the E-R and L-H mechanism on the surface of the Fe-based ZSM-5 catalyst. The Fe-based ZSM-5 catalyst is a good candidate for NH 3 -SCR both in high reactivity and outstanding stability.
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POLYMER COMPOSITES
·
2023
·Vol. 44
·期 10
·6337-6348
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IF 5.2
Kaiqiang Luo,Jinjing Guo,Jun Xu,Baohua Guo
As an important surface modifier, conventional silane coupling agents generally emit volatile organic compounds (VOCs) like methanol or ethanol during the modification of glass fiber. To avoid VOCs emission, a phenol/amine co-deposition of tannic acid (TA) with polyethyleneimine (PEI) was used to modify glass fiber (TP-GF) based on mussel-inspired surface chemistry. The reinforcement effect of TP-GF on polyamide 6 (PA6) matrix was investigated, and the corresponding results were compared with those of γ-aminopropyltriethoxysilane (KH550) modified glass fiber (KH550-GF)/PA6 composites. The results showed that the interfacial adhesion between TP-GF and PA6 matrix was superior to that between KH550-GF and PA6 matrix, and thus TP-GF/PA6 composites manifested more excellent mechanical properties than KH550-GF/PA6 composites. Among these composites, TP-GF (1.05 wt% of coating amount)/PA6 composites exhibited the optimal mechanical properties (tensile strength: 151.3 MPa, notched impact strength: 13.8 kJ m −2 ) compared with KH550-GF (1.33 wt% of coating amount)/PA6 composites (tensile strength: 144.8 MPa, notched impact strength: 9.5 kJ m −2 ). In particular, the notched impact strength was significantly increased by 45%. Notably, there was no VOCs generation during the preparation of TP-GF, indicating that TP-GF could be used as an environmentally friendly glass fiber for the fabrication of high-performance PA6 composites.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Shanshan Shang,Chao Yang,Yuanmeng Tian,Zeyu Tao,Mallory Smith,Hongyan Zhang,Lin Zhang,Liangchun Li,Qinfen Gu,Hong-Cai Zhou,Yong Sik Ok,Jin Shang
Selective adsorption using porous materials is a promising approach to removing ambient nitrogen dioxide (NO 2 ). However, the highly reactive nature of NO 2 and the often-associated release of nitric oxide (NO) render a formidable challenge in developing effective and stable adsorbents. Here, we designed multivariate porphyrin-based metal–organic frameworks (MTV-PMOFs Al-PMOF(Ni x Co y )) featuring atomically dispersed Ni/Co dual-metal centers in the porphyrin ring as active adsorption sites, as robust adsorbents capable of synergistically boosting NO 2 adsorption capability and retaining the evolved NO. The introduction of the Ni/Co dual-metal sites in MTV-PMOFs greatly enhanced the NO x adsorption performance. Under dry conditions, Al-PMOF(Ni 1 Co 1 ) exhibited a NO 2 adsorption capacity of 3.66 mmol/g (100 ppm NO 2 in feed), among the highest under similar conditions, a high NO retention ability, and good regenrability (85%). Under wet conditions, its NO 2 removal capacity was further elevated by more than 50% (5.65 mmol/g). Moreover, the Ni/Co ratio in MTV-PMOFs dictates a structure–property relationship between the released amount of NO and adsorbed capacity of NO 2 . Such a corporative NO 2 and NO adsorption was for the first time established in MOFs. The material stability and potential economic value were also investigated to demonstrate the applicability of MTV-PMOFs as NO 2 adsorbents. This work provides new perspectives for the development of adsorption-based technology for mitigating ambient NO 2 pollution and managing other corrosive and toxic gases.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ping Tan,Zhen Mao,Yuhan Li,Jiayuan Yu,Liangjun Long
The construction of CN/UiO-67 (CNU) S-scheme heterojunction composites through in situ formation of UiO-67 on carbon nitride (C 3 N 4 ) helps to address the limitations of carbon nitride (CN) in photocatalytic NO elimination. The optimized CNU 3 demonstrates superior photocatalytic efficiency, which is attributed to electronic channels constructed by Zr-N bonds and S-scheme electron transport mechanism, effectively promoting the efficient separation of photogenerated charge carriers with high redox potentials. Density Functional Theory (DFT) calculations reveal redistributed electronic orbitals in CNU 3 , with progressive and continuous energy levels near the Fermi level, which bolsters electronic conduction. Comprehensive quenching experiments, Electron Paramagnetic Resonance (EPR), and in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) analyses highlight a synergistic interplay of electrons, holes, and superoxide radicals in CNU 3 , inhibiting the generation of toxic nitrogen oxide intermediates and culminating in highly efficient photocatalytic NO oxidation. This study not only elucidates the mechanisms underpinning the enhanced performance of CNU 3 heterojunctions but also offers new perspectives on the preparation and interfacial charge separation of heterojunction photocatalysts.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
·
IF 6.007
Yue Liu,Weiyuan Yao,Xiaoli Cao,Xiaole Weng,Yan Wang,Haiqiang Wang,Zhongbiao Wu
This paper reported the feasibility of a supercritical water synthesis route (referred as CHFS) in the application of selective catalytic reduction (SCR) of NO with NH 3 . A series of well-reported Ce x TiO 2 SCR catalysts were synthesized and then subjected to a range of characterizations (e.g. XRD, XPS, H 2 -TPR, HADDF, etc.). Experimental results revealed that the unusual and rapid crystallizing environment of the CHFS route had resulted in a highly dispersed CeO 2 and a strong metal-support interaction (SMSI) for Ce x TiO 2 catalysts, which promoted the enriched surface oxygen vacancies and facilitated the formation of NO 2 and nitrite species over the catalyst surface, effectively enhancing their SCR performances. Amongst the developed Ce x TiO 2 catalysts, Ce 0.25 TiO 2 revealed the highest SCR activity with more than 90% NO conversion being achieved in a broad temperature range of 240–440 °C. Such broad temperature window was proven due to the SMSI, which lowered the NH 3 oxidation ability of CeO 2 , retaining the effective utilization of NH 3 throughout the SCR process. The work conducted herein demonstrates the feasibility of the CHFS route in the syntheses of SMSI catalysts for SCR application and also explores the SCR reaction mechanism over the well-reported Ce x TiO 2 catalysts. We expected that this work could shed some lights on the development of feasible preparative routes for the syntheses of advanced SMSI catalysts for SCR application.
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Science China-Chemistry
·
2026
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IF 9.8
Zhong Fengyi,Sheng Jianping,He Ye,Du Chenyu,Ma Xiaodan,Moghadam Majid,Sun Yanjuan,Dong Fan
Under mild continuous-flow gas-solid conditions, the direct conversion of gaseous nitric oxide (NO) in flue gas to pure ammonia (NH 3 ) is hindered by the challenges of sustaining continuous proton-electron coupling and transfer. Here, we develop a PtO x -TiO 2 photocatalyst featuring ultrafine PtO x clusters that sustain continuous electron transfer via dynamic PtO x /PtO ( x−δ ) redox cycling. Upon illumination, PtO x continuously captures photogenerated electrons to form PtO ( x−δ ) and injects them into NO antibonding orbitals, while the PtO x -TiO 2 interface simultaneously drives H 2 O dissociation to provide a steady proton flux. This persistent electron-proton coupling orchestrated by PtO x /PtO ( x−δ ) cluster interface promotes exciton dissociation, interfacial charge separation, and stepwise hydrogenation of NO to NH 3 . Under continuous-flow conditions with 200 ppm NO, PtO x -TiO 2 achieves 76.0% NO conversion, 808.25 mmol m −2 h −1 NH 3 yield, and 98.1% selectivity, representing a 9.1-fold enhancement over pristine TiO 2 and representing the current best performance in the gas-solid phase NO reduction for NH 3 synthesis. In situ spectroscopy and density functional theory (DFT) calculations reveal that the exceptional activity mainly stems from the facilitated electron-proton coupled transfer via the unique role of PtO x /PtO ( x−δ ) cluster. This work establishes a practical strategy for sustainable NO abatement with green NH 3 production without separation in gas-solid systems.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Zhiyu Zhang,Yanhong Guo,Fei Long,Xinyu Zhang,Jing Wang,Yong Ren
NO is a common harmful air pollutant which leads to various environmental and health problems and needs to be addressed urgently. Herein, by combining sol-gel method and microfluidic approach, we successfully developed novel hollow alginate microfibers containing CNT/TiO 2 photocatalysts. The resulting fibers, with diameter of 1000 μm and adjustable wall thickness of 60–150 µm, were confirmed through microscope and SEM. The formation condition about various flow rate ratios of different phases was also investigated. Subsequently, various characterization methods including XRD, FT-IR and XPS were employed to investigate structural properties of prepared CNT/TiO 2 hybrid materials. Our findings indicate that the boosted absorption ability towards the visible light region, improved photo-generated electron transfer efficiency, as confirmed by UV–vis spectroscopy and electrochemical impedance respectively, mainly account for the enhanced photocatalytic performance in NO oxidation. The optimized CNT(10 %)/TiO 2 microfibers exhibited the best NO removal efficiency of 44.3 % under visible light, which is 1.59 times that of the pure TiO 2 . This study represents an interesting case for the combined preparation of CNT/TiO 2 /alginate microfibers for NO abatement.
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INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Chengshun Liu,Jianlong Li,Miao Wang,Guotai Jian,Chen Zhu,Hanxiang Li,Yongxia Jia,Jinchi Tang,Lanting Zeng
Camellia sinensis var. assamica is a major variety used to produce black tea. However, the core compounds influencing its aroma quality are unknown. In this study, Yinghong No. 9 black tea (YJBT), a distinctive black tea in South China, was analyzed. We detected 44 aroma compounds and identified seven key contributors, namely linalool, geraniol, trans -linalool oxide (furanoid), hexanal, methyl jasmonate, phenylacetaldehyde, and β-ionone. Linalool, which was generally more abundant in spring tea than in summer tea, contributed significantly to sweet and floral aromas. ( R )-Linalool was the primary linalool form in Yinghong No. 9, wherein it was highly abundant in high-quality tea leaves. The substantial expression of a linalool synthase gene and the relatively high catalytic efficiency of the encoded enzyme likely contributed to the accumulation of ( R )-linalool. This study identified the primary aroma compounds in YJBT, providing a foundation for advancing our knowledge of the aromatic quality of black tea.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiahui He,Zhenlong Li,Jueying Chen,Jiaxin Wang,Lipeng Qiao,Baolin Guo,Juan Hu
It is still challenging to design stimuli-responsive smart hydrogel dressing to promote bacteria-infected diabetic wound healing from the whole healing stage by intelligently responding to external stimuli or wound microenvironment. In addition, nitric oxide (NO) and oxygen (O 2 ) have been shown to accelerate diabetic wound healing by promoting angiogenesis and alleviating hypoxia. A series of NIR/glucose stimuli-responsive multifunctional smart hydrogels with NO/O 2 dual gas-releasing properties was designed based on N-carboxyethyl chitosan-grafted-phenylboronic acid (CECP), oxidized dextran (OD), ε-polylysine (EPL)-coated manganese dioxide (EMn), and β-cyclodextrin-reduced graphene oxide/N, N’-di-sec-butyl-N, N’-dinitroso-1,4-phenylenediamine (rGB) via dual dynamic crosslinking to promote bacteria-infected diabetic wound healing. The added rGB and EMn as photothermal agents rapidly kill bacteria through photothermal therapy. Meanwhile, rGB endows CECP/OD/EMn/rGB hydrogels to release NO under NIR stimulation to promote angiogenesis. Nanozyme EMn with catalase (CAT)/superoxide dismutase (SOD)-like activity can scavenge ROS and release O 2 to alleviate hypoxia and oxidative stress. The phenylboronic acid in CECP forming phenylboronate ester structure endows hydrogel with glucose-controlled release of doxycycline. NIR/glucose stimuli-responsive CECP/OD/EMn/rGB hydrogels with NO/O 2 dual gas-releasing property in a full-thickness skin wound-infected diabetic model reduced the inflammation, promoted wound contraction, collagen deposition, angiogenesis, and alleviated wound hypoxia, providing new ideas for treating bacteria-infected diabetic wounds.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xiong-Li Liu,Jing Lou,Xian-Qiao Zhu,Di-Cheng Pan,De-Wu Liu,Hui-Xian Jing,Wenjing Zhang,Hong-Xing Cen,Guo-Deng Guo-Deng Dong
The development of single chiral source-derived ligands to fine-switch enantioselectivity has continuously attracted the attention in asymmetric catalysis. Herein, we use the same chiral source L-prolinamide as the starting material, synthesizing chiral bidentate pyridine-type N-oxide ligands (denoted as Py-NO) and chiral monodentate phenyl N-oxide ligands (denoted as Ph-NO); their effectiveness was demonstrated in the switch of enantioselectivity in palladium(II)-catalysed Friedel-Crafts (FC) alkylation of indoles and 2,3-dioxopyrrolidines, and both enantiomers of structurally important indole derivatives can be prepared in good yields (up to 91% yield) and high enantioselectivities (up to 99% ee). Key to the success of switch of enantioselectivity is the existence of two different activation patterns in this palladium(II) catalytic system. Experiments demonstrated that a counteranion would plausibly coordinate to the palladium(II) center in the stereoselectivity-determining step. Preliminary mechanistic studies provide a rational explanation for the above observations. This study was the first example of monodentate ligand in asymmetric catalytic Friedel-Crafts alkylation.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Ping Yuan,Weigang Zhang,Mingrui Yang,Yun Chen,Zhifei Yang,Zheng Zhao,Lingling Zhang
The emergence of treatment approaches that integrate conventional phototherapy with additional adjuvant treatments has garnered considerable interest. In this study, we proposed a complex utilizing Fe and polydopamine as a carrier, co-loaded with the nitric oxide initiator L-arginine (L-Arg) and the photosensitizer indocyanine green (ICG), as a potential strategy for the “photothermal/photodynamic/Chemodynamic/nitric oxide gas therapy” of osteosarcoma. Nanoparticles have the ability to undergo degradation within the mildly acidic conditions present in the tumor microenvironment. Consequently, the resulting release of Fe ions facilitates the consumption of hydrogen peroxide through Fenton/Fenton-like reactions, thereby generating hydroxyl radicals (•OH) that possess potent cytotoxic properties. L-Arg can also be catalyzed by reactive oxygen species (ROS) or NO synthase overexpressed in cancer cells to generate NO, which is not only used for gas therapy (GT), but also as a biological messenger to regulate vasodilation to relieve tumor hypoxia. More importantly, the addition of low-dose near-infrared laser can not only promote the efficiency of the above two reactions, but also achieve PTT/PDT and obtain good synergistic tumor treatment effects. The anti-tumor efficacy of nanoparticles was verified in the 143B mouse osteosarcoma model. This “PTT/PDT/CDT/GT” strategy expands bone tumor treatment options through nanoparticle-mediated enhanced therapy.
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