查找使用阿拉丁产品的科研文献

Investigation of Cu-doped MnCeOx in PTFE catalytic fiber for synergistic removal of CB and NO at low temperature

Shengyong Lu,Xuanhao Guo,Manting Chen,Guanjie Wang,Juan Qiu,Jiaming Ding,Minghui Tang,Zhengdong Han,Yaqi Peng,Jianhua Yan

The synergistic removal of multiple pollutants from flue gas has attracted growing interest in recent years. In this study, Cu-doped MnCeO x catalysts were synthesized via an impregnation method and integrated into PTFE fibers using a split-film process to enable the simultaneous removal of chlorobenzene (CB) and nitrogen oxide (NO). Among the catalysts tested, Mn 2 Ce 1 Cu 0.6 O x exhibited the highest performance, achieving 90 % CB degradation and 100 % NO conversion at 180 °C. The PTFE-based catalytic fibers also demonstrated excellent removal efficiency, reaching 83.7 % for dioxins at the same temperature. A possible reaction mechanism is proposed in which the NH 3 -SCR process facilitates CB oxidation by generating reactive intermediates. Cu doping was found to enhance the density of acid sites and promote the ring-opening of CB, thereby suppressing chlorine accumulation and improving catalyst stability. These findings provide valuable insights for the development and optimization of catalytic bag filters for the efficient, synergistic removal of multiple pollutants from industrial emissions.

Simultaneous Removal of Elemental Mercury and NO from Simulated Flue Gas at Low Temperatures over Mn–V–W/TiO2 Catalysts

Jialin Meng,Yufeng Duan,Peng Hu,Yifan Xu,Xinze Geng,Ting Yao,Shaojun Ren,Hongqi Wei

A series of Mn–V–W/TiO2 (Mn–VWT) catalysts were synthesized by the impregnation method and calcinated at different temperatures (300–600 °C). To explore the effects of the reaction temperature, SO2, and H2O on the simultaneous removal performance of elemental mercury (Hg0) and NO, Mn–VWT were investigated by a fixed-bed reaction system. Various techniques (scanning electron microscopy, Brunauer–Emmett–Teller, X-ray diffraction, H2-temperature-programmed reduction, NH3-temperature-programmed desorption, and X-ray photoelectron spectroscopy) were utilized to characterize the samples. The results showed that the catalytic activity of Mn–VWT first increased and then decreased with the increasing calcination temperature. The removal efficiency of Hg0 and NO still had good performance even in low reaction temperature (200 °C), achieving 100 and 82%, respectively. Mn–VWT-400 had the best simultaneous removal performance because of the highest content of the Mn4+, V4+, and chemisorbed oxygen Oα and the best reductive activity at low temperature. Furthermore, SO2 irreversibly inhibited Hg0 and NO removal ability due to the sulfate and sulfite generation on the surface of Mn–VWT-400. Especially, the inhibition effect was more serious if SO2 and H2O coexisted because the rate of sulfate/sulfite was higher than that of the former. In addition, with the increase in reaction temperature, the effect of SO2 and H2O on the removal of Hg0 and NO over Mn–VWT was gradually reduced.

Coexistence of enhanced Hg0 oxidation and induced Hg2+ reduction on CuO/TiO2 catalyst in the presence of NO and NH3

Hailong Li,Weilin Zhang,Jun Wang,Zequn Yang,Liqing Li,Kaimin Shih

Simultaneous nitrogen monoxide (NO) reduction and elemental mercury (Hg 0 ) oxidation in the presence of ammonia (NH 3 ) was for the first time studied on a copper oxide/titanium dioxide (CuO/TiO 2 ) catalyst at low flue gas temperatures. More than 80% NO reduction and 90% Hg 0 oxidation were concurrently achieved on the CuO/TiO 2 catalyst at 250   °C under a simulated NH 3 selective catalytic reduction (SCR) atmosphere. NO was likely oxidized on the CuO/TiO 2 catalyst to form active nitrogenous species, particularly with the aid of oxygen. The active nitrogenous species then significantly promoted Hg 0 oxidation. NH 3 itself did not affect Hg 0 conversion on the CuO/TiO 2 catalyst. The co-occurrences of NO and NH 3 led to a reduction in oxidized mercury (HgO in this work), which partially offset the Hg 0 oxidation and therefore resulted in a relatively lower Hg 0 conversion efficiency. However, compared to flue gas without NO and NH 3 , the combined presence of NO and NH 3 still enhanced Hg 0 oxidation over the CuO/TiO 2 catalyst, primarily because of the overwhelming benefit from NO. This is superior to many other SCR catalysts, including commercial vanadia-based SCR catalysts, on which an SCR atmosphere generally inhibits Hg 0 conversion.

Constructing hollow silkworm structure in MnOx–TiO2 catalysts for improving the performance in selective catalytic reduction of NO by NH3

Xie Chong,Yang Shenghui,Shi Jian-Wen,Niu Chunming

A novel MnO x –TiO 2 catalyst with hollow silkworm structure was synthesized successfully via an ethanol-thermal strategy by using activated carbon fiber felt as template for the first time. The silkworm-like MnO x –TiO 2 catalyst (MnTi) exhibited higher NO x conversion in the whole experimental temperature region (90–330 °C) under a high space velocity of 36,000 h −1 in comparison with the common MnO x –TiO 2 catalyst without hollow silkworm structure (MnTi-B). The excellent catalytic performance of MnTi can be attributed to its high specific surface area, large content of active surface oxygen species (O S ), and more surface acid sites. In addition, the MnTi catalyst also exhibited excellent resistance to water or SO 2 poisoning.

Promotional effect of phosphorus addition on improving the SO2 resistance of V2O5-MoO3/TiO2 catalyst for NH3-SCR of NO

Li Huang,Yiqing Zeng,Yibo Gao,Hu Wang,Yuhao Zong,Zhengfeng Chang,Shule Zhang,Pei Han,Yang Yu

The oxidation of SO 2 into SO 3 promote the formation of NH 4 HSO 4 (ABS), which can cover surface active sites catalyst, and then leading to the decrease of NH 3 -SCR De-NO x activity. In this work, phosphorus species were loaded on the V 2 O 5 -MoO 3 /TiO 2 De-NO x catalyst to enhance its SO 2 resistance via inhibiting the SO 2 /SO 3 conversion. XRD and N 2 -adsorption results showed that phosphorus has little impact on the structure and pore property of the catalyst. The results of XPS , H 2 -TPR, and NH 3 -TPD analyses illustrated that suitable amount of phosphorus (1%) increases the content of polymeric vanadate and chemisorbed oxygen (O α ) of the catalyst, which is benefit to the SCR process. Phosphorus species decreases the SO 2 absorbability and SO 2 oxidation activity of V-Mo-P/Ti catalysts, thus it exhibits higher NH 3 -SCR activity than that of the P-free catalyst at presence of SO 2 due to the lower SO 2 /SO 3 conversion and fewer amount of NH 4 HSO 4 deposition.

Dual-dynamic carboxymethyl chitosan hydrogel with photothermal properties and programmed radical/NO release properties for enhanced healing of infected wounds

Hongchao Deng,Zikang Wang,Shoumiao Peng,Shunyu Yao,Yiwang Zhao,Huiling Guo

Bacterial-infected wound healing still faces substantial challenges, including multidrug-resistance, uncontrollable bleeding, long-term inflammation, and impaired angiogenesis. However, current treatment strategies cannot meet the complex demands of skin wound healing. We here developed a dual dynamic CFP hydrogel based on Schiff base and borate ester bonds between carboxymethyl chitosan (CMCS), polyvinyl alcohol (PVA), and 2-formylphenylboronic acid (2-FPBA). Meanwhile, customized L-arginine/epigallocatechin-3-gallate/ferric ion (EAF) nanoparticles and the thermal-labile 2,2′-azobis[2-(2-imidazolin-2-yl) propane] dihydrochloride (AIPH) initiator were embedded into the CFP hydrogel for healing infected wound. The EAF/A/CFP hydrogel could create a protective barrier on bleeding wounds and reduced blood loss. Under 808 nm laser irradiation, the hydrogel exhibited excellent photothermal, alkyl free radical production ability, and continuous release of nitric oxide (NO) to effectively eradiate the bacteria, including mature biofilms. In addition, NO release regulated inflammation and promoted angiogenesis, thus significantly promoting the wound healing. The EAF/A/CFP hydrogel successfully achieved rapid wound repair in a full-thickness skin wound model. Consequently, this study provides a potential dressing for comprehensive management of skin wound healing.

NO-Responsive Oleanolic Acid Self-Assembled Micelles Co-Loaded with BAY 11-7082 for Synergistic Chondroprotection and Anti-Osteoarthritis Therapy

Dandan Zhang,Zhigang Zhang,Dingxing Huang,Zhuoran Sun,Jiamin Huang,Chi Zhang,Qingyang Zeng,Qiling Liu,Wenzhuo Chen

Osteoarthritis is an irreversible degenerative joint disease driven by sustained NF-κB-mediated inflammatory responses, and conventional intra-articular hyaluronic acid or small-molecule NF-κB inhibitors cannot achieve targeted on-demand treatment due to poor solubility, rapid clearance and lack of lesion microenvironment responsiveness. OA with inherent anti-chondrolytic activity can self-assemble into nanocarriers in water, yet it lacks stimuli-responsive capacity. Herein, we rationally designed and synthesized an OA-Der by covalently conjugating o-phenylenediamine fragments to the OA backbone.1H NMR and HRESI-MS spectra fully verified the accurate chemical structures of intermediate and final OA-Der. Blank OA-Der micelles exhibited uniform spherical core–shell nanostructures (50–150 nm) under TEM and AFM, while pathological high NO triggered complete disassembly of micellar assemblies. We further co-assembled OA-Der with NF-κB inhibitor BAY 11-7082 to construct NO-responsive BAY@OA-Der supramolecular micelles. In vitro experiments using human C28/I2 chondrocytes with LPS-induced inflammatory injury demonstrated that BAY@OA-Der significantly improved cell viability and reduced apoptotic chondrocyte proportion. At mRNA and protein levels, the supramolecular micelle formulation remarkably suppressed NF-κB p65 phosphorylation, downregulated cartilage-degrading ADAMTS5, and upregulated ACAN compared with free BAY or blank OA-Der. Collectively, this natural bioactive self-assembled NO-responsive delivery platform achieves synergistic anti-inflammatory and matrix-protective effects by precisely releasing drugs at NO-overexpressed osteoarthritis inflammatory sites and offers an in vitro design strategy for osteoarthritis responsive delivery systems.

Engineering a Haversian-gyroid biomimetic scaffold: NIR-triggered photothermal-NO cascade antibacterial, hydroxyapatite enhanced pH balance and cell osteogenic differentiation

Huixing Li,Jiaxing Xiong,Fangwei Qi,Jun Zan,Xiuwen Gao,Wenjie Ma,Kunlong Li,Gao Pan,Pan He,Dongan Wang,Yang Shuai,Shuping Peng

Biomimetic hierarchical bone scaffold: outer Haversian canals and inner Gyroid pores for high memchanical strength. • Cascade antibacterial: thermal cleaves biofilms and Fe-NO bonds, releasing NO into bacteria to kill S. aureus and E. coli • Synergistic osteogenesis: thermal activates HSP70, synergizing with Ca 2+ and PO 4 3- to boost osteogenic differentiation. • pH regulation: amine groups from oxidative self-polymerization increase the pH value, enhancing scaffold stability. Poly- L -lactic acid (PLLA) is widely used in bone scaffold engineering due to its favorable biocompatibility, biodegradability, and processability. However, its mechanical properties are limited by insufficient crystallinity during fabrication. Moreover, bone repair is often accompanied by early bacterial infection and local pH reduction, which challenge the antibacterial effect, osteogenic capacity and structural stability of PLLA scaffolds. Herein, PLLA and hydroxyapatite (HA) are melt-blended into PLLA/HA (PHA). followed by self-polymerization of polydopamine (PDA) and electrostatic adsorption sodium nitroprusside of (SNP). The composite is then prepared into a PHA@PDA-SNP scaffold, with an outer Haversian canal layer and inner Gyroid-perforated. Ingeniously, the scaffold utilizes photothermal produced by near-infrared light to cleave biofilm and the Fe-NO bond in SNP, promoting NO release and entry into bacteria. Meanwhile, thermal can activate HSP70, synergizing with Ca 2+ and PO 4 3- released by PHA to boost osteogenic differentiation. Moreover, the amine groups retained during the oxidation process of PDA can weaken the acidic environment and enhance scaffold stability. Results show that the bone scaffold mimics the natural bone structure with high compressive strength (162.9 MPa) by biomimetic manufacturing. Scaffold exhibits cell osteogenic differentiation as evidenced by a 70% upregulation of HSP70 and Ca 2+ influx, and a 4.5-fold increase of ALP and ARS. Scaffold utilizes photothermal and NO to achieve antibacterial rates of 97.4% and 98.2% against S. aureus and E. coli , respectively. Download: Download high-res image (194KB) Download: Download full-size image

The heterojunction regulated by Au nanoparticles efficient removal of NO through the synergistic effects of SPR and the electron bridge

Youzhou He,Zhiqiang Guo,Yue Li,Xingyan Liu,Kaili Wu,Yuyu Fang,Rong Peng,Min Fu,Bowen Lei

The elimination of low-concentration (ppb) nitrogen oxides (NO x ) in city and indoor environments, particularly the selective removal of NO while preventing toxic NO 2 formation is a significant challenge. Photocatalytic technology offers a promising solution, but its effectiveness is limited by high carrier recombination rates and insufficient active sites. This study introduces a photocatalyst (Au@NM/ZIF) that forms a Z-type heterojunction structure by precisely positioning gold nanoparticles within the NM/ZIF framework. The catalyst consists of amino-functionalized NH 2 -MIL-125 and ZIF-8, with gold nanoparticles serving dual roles: UV-Vis analysis shows that their surface plasmon resonance (SPR) enhances visible light absorption, promoting the generation of charge carriers that drive the oxidation of NO to NO 3 − . Additionally, X-ray photoelectron spectroscopy (XPS) and work function analysis indicate that gold nanoparticles function as an electronic bridge, optimizing charge transfer between NM and ZIF-8, improving electron-hole separation and increasing active site utilization, thereby significantly enhancing NO conversion efficiency. In situ Fourier-transform infrared spectroscopy (FT-IR), electron spin resonance (ESR), and radical capture experiments further clarify the formation pathways of preliminary products and completed outputs, emphasizing the important roles of active radicals (such as •OH and •O 2 − ) in the deep oxidation of NO. This research offers a valuable solution for effectively removing low-concentration NO x .

Synergistic effect of cobalt and niobium in Co3-Nb-Ox on performance of selective catalytic reduction of NO with NH3

Zhang Bo-Lin,Deng Li-Feng,Liu Bo,Luo Chun-Yun,Liebau Michael,Zhang Shen-Gen,Gläser Roger

Abstract Combining the redox properties of Co and the acid properties of Nb in a Co 3 -Nb-O x catalyst is shown to provide superior performance in the selective catalytic reduction of NO with NH 3 (NH 3 -SCR). Co 3 O 4 shows average activity, however, it exhibits a poor N 2 selectivity. Nb 2 O 5 is not active for NH 3 -SCR. However, the mixed Co 3 -Nb-O x catalyst shows higher NO conversion and N 2 selectivity than the single Co 3 O 4 and Nb 2 O 5 catalysts at 100–300 °C. The results of temperature programmed reduction by H 2 and X-ray photoelectron (XP) spectra indicate that the addition of Nb changes the chemical states of Co and decreases the concentration of Co 3+ and O α , adjusting the activity for catalytic oxidation to a moderate level. This suppresses the formation of undesired N 2 O from the over-oxidation of NH 3 . Incorporation of Co and Nb into one solid synergistically couples their redox behavior and surface acidity, ensuring the high catalytic activity and N 2 selectivity in NH 3 -SCR. Graphical Abstract

Synergistic charge redistribution at SrTiO3@NH2-MIL-125 S-scheme heterostructure: steering photogenerated reactive species for efficient NO-to-nitrate conversion

Wenrui Dai,Chenxiang Wang,Jiajia Gao,Haotong Ma,Yingchun Miao,Shuo Wang,Zhanshuo Tao,Shuning Xiao

A precise blending strategy towards the organoleptic augmentation of Hutai No. 8 table grape wine: uncovering the chemical profiles behind

Biying Zhang,Cuiyi Zhang,Hui Liu,Jiaxin Chen,Yangbo Song,Xianghong Xie,Ling He,Shuwen Liu,Kan Shi

Blending is a viable strategy to enhance the organoleptic quality of wine. This study used Hutai No. 8 table grape wine (No. 8 TGW) as the base wine, and blended No. 8 TGW with Cabernet Sauvignon and Syrah to improve its quality, while further investigating chemical profiles responsible for these improvements in terms of polyphenols, aromas and sensory attributes. Through a D-optimal design guided by sensory evaluation, an optimal precise blend ratio of 76.7 % No. 8 TGW, 16.7 % Cabernet Sauvignon, and 6.6 % Syrah was identified, resulting in total phenolic content increased by 60.74 %. Dissecting the aroma chemical profiles further unveiled that increased 17.82 % terpene and 17.74 % acetate ester were the main contributors to aroma complexity. This study elucidates the effectiveness of sensory-driven wine blending strategy for quality augmentation of No. 8 TGW, and clarifies the chemical profiles behind, thereby offering a new paradigm for upgrading table grape wine.