Small
·
2023
·Vol. 19
·期 35
·2300199
·
IF 13.3
Yaping He,Xuanzong Wang,Chi Zhang,Junkui Sun,Jianzhong Xu,Daifeng Li
Bacterial infections pose a significant threat to global public health; therefore, the development of novel therapeutics is urgently needed. Herein, a controllable antibacterial nanoplatform utilizing cyclodextrin metal–organic frameworks (CD-MOFs) as a template to synthesize ultrafine silver nanoparticles (Ag NPs) in their porous structure is constructed. Subsequently, polydopamine (PDA) is encapsulated on the CD-MOFs’ surface via dopamine polymerization to enhance the water stability and enable hyperthermia capacity. The resulting Ag@MOF@PDA generates localized hyperthermia and gradually releases Ag + to achieve long-term photothermal-chemical bactericidal capability. The release rate of Ag + can be accelerated by NIR-mediated heating in a controllable manner, quickly reaching the effective concentration and reducing the frequency of medication to avoid potential toxicity. In vitro experiments demonstrate that the combined antibacterial strategy can not only effectively kill both gram-negative and gram-positive bacteria, but also directly eradicate mature biofilms. In vivo results confirm that both bacterial- and biofilm-infected wounds treated with a combination of Ag@MOF@PDA and laser exhibit satisfactory recovery with minimal toxicity, displaying a superior therapeutic effect compared to other groups. Together, the results warrant that the Ag@MOF@PDA realizes synergistic antibacterial capacity and controllable release of Ag + to combat bacterial and biofilm infections, providing a potential antibiotic-free alternative in the “post-antibiotic era.”
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PubMed
高影响因子
Nano Research
·
2023
·Vol. 16
·期 7
·10215-10221
·
IF 9.9
Hu Qianqing,Si Junjie,Chen Desui,Hao Xiaoming,Xu Rui,Du Yihang,Du Zhuopeng,Gong Xinquan,Zhao Hong,Cai Peiqing,Ai Qi,Yao Xin,Yan Yu,Zhang Zenan,Cai Muzhi,Liu Wei,Kang Yongyin,Liu Zugang
All-solution-processed inverted quantum dot (QD) light-emitting diodes (QLEDs) with transparent bottom cathodes can be directly connected to the n-type thin-film transistors, offering a feasible solution for low-cost active matrix-driven QD displays. However, the subsequent solution-deposition of the hole-transporting layer destroys the underneath QD films, resulting in largely deteriorated device performance. Various strategies have been implemented to prevent QD film from dissolution, but all at a heavy cost of device performance suffering from either reduced efficiency or increased driving voltage. Here, a facile and effective water-treatment approach for QD film to fabricate inverted QLEDs through all solution processing is reported. The water treatment substitutes the long-chain oleate ligands with hydroxyl groups, resulting in significantly improved non-polar solvent resistance of the QD films. Importantly, the QD films reserve their excellent photoluminescence efficiency after water treatment. With the water-treated QD film as the emissive layer, all-solution-processed inverted red QLED with a peak external quantum efficiency of 19.6%, a turn-on voltage of 1.8 V, and a T 50 operational lifetime of 150,000 h at 100 cd·m −2 was achieved. Furthermore, efficient and low-voltage-driven green and blue QLEDs can also be prepared with this method. This work provides a feasible strategy for the fabrication of high-performance all-solution-processed inverted QLEDs, paving the way toward achieving QLEDs by all ink-jet printing.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 29
·14056-14067
·
IF 3.3
Yanan Duan,Jianjiang Lu,Yujun Yan,Yanbin Tong,Yalong Song,Jinfeng Xiao
The construction of photocatalysts that can activate persulfate (PS) efficiently is the key to the removal of water pollutants. In this study, a BiOI/BiOCOOH (IB) composite photocatalyst was prepared via an ultrasound-assisted solvothermal method, which activated PS under visible light to efficiently degrade ciprofloxacin (CIP). Compared with those of pure BiOCOOH and BiOI, the photocatalytic activity of IB was significantly improved. The 0.5 IB/PS system exhibited a maximum CIP (10 mg L−1 50 mL) degradation rate of 95.10% after 90 min of irradiation, and the photoreaction rate constant was 0.0304 min−1, which was 100.7-fold that of BiOCOOH/PS, respectively. Through photolysis experiments involving different water quality and other antibiotics and dyes, the practical application potential and universal ability of the 0.5 IB/PS system were revealed. After five cycles, the degradation rate of CIP decreased by only 13.33%, which showed good cyclic stability. On the basis of a quenching experiment and electron spin resonance measurement, a stepped heterojunction photocatalytic mechanism involving charge transfer and separation was proposed. In addition, the degradation pathway of CIP was proposed based on LC–MS analysis. This work shows that the strategy of constructing a heterojunction photocatalyst to activate PS has great application potential in environmental water remediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yulin Zhang,Shuo Cheng,Guozhao Ji,Aimin Li
The light fractions of tire pyrolysis oil (TPO) are rich in valuable chemicals, such as limonene, but the utilization of TPO-derived limonene or limonene derivatives was limited by the difficulties to separate limonene from the rest compounds, especially p -cymene which has a similar molecular structure and physical properties (molecular size, melting point and boiling point) as limonene. In order to utilize limonene and separate p -cymene, this study took advantage of the difference in oxidizability between limonene and p -cymene, and proposed a method of epoxidizing TPO before the separation. After epoxidation, limonene was successfully converted into limonene epoxides, while aromatic compounds in TPO such as p -cymene were inert and non-oxidizable. Limonene epoxides have a higher boiling point than p -cymene, so the limonene epoxides can be easily refined by distillation. In order to accelerate the oxidation of limonene, a peroxophosphotungstate catalyst was used as a sustainable solvent-free process. The fraction of TPO between 160 and 190 °C which has 298 g/L limonene was tested in this study. The epoxidation of the TPO 160-190 could reach complete conversion to limonene 1,2-oxides and diepoxide limonene. The resulting oil could be divided into p -cymene enriched fraction and limonene epoxides enriched fraction by simple distillation, and the limonene epoxides enriched fraction contained more than 80% of limonene epoxides. The catalytic mechanism was proposed with the assistance of FT-IR, GC–MS, and 31 P NMR analysis. This work presents a novel strategy of epoxidizing limonene for limonene epoxide and p -cymene separation, which could bring a breakthrough for limonene epoxide and p -cymene production from waste-derived oils.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Chunjiao Liu,Zhiwei Zhou,Xing Li,Rui Yu,Haiqing Chang,Jiawei Ren,Changyu Wang
Ultrafiltration (UF) is an effective technology for treating algae-containing water. The algal intracellular organic matter (IOM) released by dead algae during an excessive algae growth phase causes more serious membrane fouling than viable algal cells and algal extracellular organic matter (EOM), which seriously restricts stable operation of UF. This paper studied the removal of IOM by a Bi 2 O 3 –TiO 2/ PAC (Bi-doped TiO 2 nano-composites supported by powdered activated carbon) photocatalytic oxidation-ceramic ultrafiltration membrane, the inhibitory effect of membrane fouling at different photocatalytic oxidation times, and the fouling mechanism. The results show that both the adsorption and photocatalytic oxidation of Bi 2 O 3 –TiO 2 /PAC can significantly remove proteinoids and humic acid-like fluorescent components present in IOM, with removals of UV 254 and DOC reaching up to 81.8% and 44.0%. The generated superoxide radicals and hydroxyl radicals positively affect the degradation of organic compounds of various molecular weights, and holes mainly degrade acidic low-molecular weight organic compounds. When the photocatalytic oxidation time was extended to 60 min, the membrane flux increased by 70.7% and the reversible resistance and irreversible resistance decreased by 83.4% and 90.1%, respectively. Under these conditions, the fouling mechanism changed from complete blockage to intermediate blockage. In the late stage of photocatalytic oxidation (90–120min), part of the high and medium molecular weight organic components were oxidized to produce low-molecular weight organic compounds (LMW acidic and neutral organic compounds), and blockage of filter cake became the main fouling mechanism. After photocatalysis , the zeta potential decreases significantly and the interaction forces between pollutants and pollutants are transformed into repulsive forces. Application of an appropriate photocatalytic oxidation time can alleviate the ultrafiltration membrane fouling caused by algal-derived organics.
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高影响因子
International Journal of Green Energy
·
2023
·
IF 3.3
Zefeng Zhang,Xianli Fang,Haiyan Qian
ZnS is a well-known photocatalyst in the field of water treatment, but its applicability is limited due to poor visible light sensitivity, low photon efficiency, and photo corrosion. In this study, a new type of ZnS/Ti3C2Tx composite photocatalyst was developed by growing ZnS microspheres on a single-layer Ti3C2Tx, which is based on the sheet-like structure and metal-like characteristics of Ti3C2Tx. The resulting Ti3C2Tx-based composite photocatalyst with ZT0.35% showed superior catalytic activity in the degradation of methyl orange under natural light. The catalytic rate constant was 3.51 times higher than that of ZnS alone, reaching a maximum of 0.0244 min−1. Within 120 minutes, the degradation rate of methyl orange was 96.3%, while that of ZnS was only 41.6%. Photoluminescence and free radical scavenging experiments revealed that the composite structure is responsible for the improved photocatalytic activity and that the ZnS/Ti3C2Tx structure is favorable for the separation and transport of photogenerated carriers. The developed ZnS/Ti3C2Tx composite has great potential as a photocatalyst for the degradation of organic contaminants.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·
IF 3.3
Bo Wang,Lianfeng Wu,Ao Sun,Tengfei Liu,Lifang Sun,Wen Li
In this study, a Cu2O/g-C3N4 nanocomposite was prepared through in situ growth of Cu2O nanoparticles on g-C3N4 nanosheets. Subsequently, the antibacterial activities of Cu2O, g-C3N4 and Cu2O/g-C3N4 composites against Staphylococcus aureus and Pseudomonas aeruginosa were studied, respectively. The results show that the minimum bacteriostatic concentration of the composite is significantly smaller than that of Cu2O and g-C3N4 alone, and it also has better long-term bacteriostatic effect. The bacteriostatic effect of the prepared Cu2O/g-C3N4 nanocomposites is further enhanced by visible light irradiation. The first-principles calculation based on density functional theory (DFT) was used to obtain the work function of the composite materials. The Cu2O/g-C3N4 composite has a work function that is significantly lower than that of Cu2O and g-C3N4. The lower work function is beneficial to the separation of electrons and holes and the formation of reactive oxygen species (ROS) on the surface of the material, further reducing photocorrosion. This also explains the reason why the composite material has high bacteriostatic efficiency and better bacteriostatic effect. In addition, the calculation of the differential charge shows that the Cu atom near the heterojunction interface has a strong positive charge, which makes it more difficult to cause redox reactions and enhances the long-acting effect of the bacteriostatic agent. Therefore, based on our experimental and theoretical calculation results, the Cu2O/g-C3N4 composite has a broad application prospect in the field of photocatalytic bacteriostasis.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 9
·5964-5974
·
IF 2.1
Zhou Xuebin,Ying Zhihua,He Xingxin,Zhang Chenhan,Zheng Xiaolong,Zheng Peng
Cellulose nanofiber (CNF), a natural polymer material with a high specific surface area, is a potential candidate for gas sensors. Here, we report Au/SnO 2 composites with excellent performance synthesized by a chemical precipitation method based on CNF-assisted synthesis, and a series of Au/SnO 2 composites were prepared by adjusting the Au content. The sensitivity of the 1.5 wt.% Au/SnO 2 sensor to a low concentration of 1 ppm NO 2 was 53, nearly 17 times higher than that of pure SnO 2 synthesized by CNF, under ultraviolet (UV) irradiation at a wavelength of 365 nm. The crystal structure of the composite was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), revealing that the composites had high crystallinity and particles reaching the nanoscale. Further experimental data showed that the CNF-assisted synthesis Au/SnO 2 sensors had good selectivity, repeatability, and stability. Additionally, the sensor is able to maintain its excellent gas sensing performance even under varying humidity conditions.
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高影响因子
FERROELECTRICS
·
2023
·
IF 0.8
Peisong Tang,Xiaoqian Lu,Xuezhi Wei,Jing Zhang,Shiyu Wen,Huize Xu,Wei Yong,Ruipeng Hou,Haifeng Chen
Using praseodymium nitrate, cobalt acetate and citric acid as main raw materials, the PrCoO3 photocatalyst was prepared by sol-gel method. The PrCoO3 samples were characterized by thermogravimetry and differential scanning calorimetry (TG-DSC), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR). The photocatalytic activity of PrCoO3 was tested by simulating polluted water with 10 mg/L methyl orange solution under ultraviolet light irradiation. The results show that pure PrCoO3 can be prepared by calcination in the range of 600 to 900 °C. The average particle size of PrCoO3 is about 30 μm. The photocatalytic performance of PrCoO3 is the best under the conditions of 700 °C calcination and ultraviolet light irradiation for 120 min, and the degradation rate of methyl orange (10 mg/L) can reach 98%. The PrCoO3 samples are consistent with first-order kinetics for the degradation of methyl orange. And the apparent rate constants is k = 0.0346 min−1. PrCoO3 sample shows good ultraviolet light photocatalytic activity and has a broad application prospect in the field of photocatalysis.
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Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 15
·4544-4551
·
IF 7
Lin Yang,Hui Duan,Xiaoxiang Xu
Narrow-bandgap perovskite oxynitrides emerge as a promising class of inorganic photocatalysts to store solar energy in chemical fuels. However, conventional synthetic routes generally introduce a high defect concentration in these compounds, particularly at grain boundaries (GBs), which also intercept charge transportation, thus severely undermining the photocatalytic performance. Herein, we demonstrate that GB-free porous single crystals (PSCs) of narrow bandgap semiconductor LaWO0.6N2.4 can be prepared by the topotactic conversion of BiLaWO6. Due to a high structural homogeneity and porosity, LaWO0.6N2.4 PSCs deliver a good photocatalytic activity for oxidizing water into O2 even under near-infrared light illuminations. Under optimal conditions, an apparent quantum efficiency (AQE) value as high as 0.13% at 800 ± 20 nm were achieved, being the first near-infrared-light active oxynitride for photocatalytic water oxidation thus far. Steady overall water splitting into stoichiometric H2 and O2 has also been realized in a Z-scheme system employing LaWO0.6N2.4 PSCs as the O2-evolution moiety under visible light insolation. These results not only justify that PSCs serve as an ideal platform to trigger the photocatalytic performance of oxynitrides with high defects content but also attract great attention upon W-based perovskite oxynitrides for solar energy conversions.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Shirong Zhang,Xuan Liu,Yijie Hao,Hongna Yang,Wenbo Zhao,Chun Mao,Shenglin Ma
Due to the complexity of tumors, multimodal therapy for them has always been of concern to researchers. How to design a multifunctional drug nanoplatform with cascade effect and capable of responding to specific stimuli in the tumor microenvironment is the key to achieve efficient multimodal synergistic therapy of cancer. Here, we prepare a kind of GNRs@SiO 2 @PDA-CuO 2 - l -Arg (GSPRs-CL) nanomotors for systematic treatment of tumor. First, under near-infrared (NIR) irradiation, GSPRs-CL can generate heat and exhibit excellent photothermal therapy effect. Then under acidic conditions, CuO 2 can be decomposed to release Cu 2+ and generate H 2 O 2 , which not only complemented the limited endogenous H 2 O 2 in cells, but also further triggered Fenton-like reaction, converting H 2 O 2 into •OH to kill cancer cells, thereby achieving chemodynamic therapy. Furthermore, both endogenous and exogenous H 2 O 2 can release nitric oxide (NO) in response to the occurrence of l -Arg of nanomotors to enhance gas therapy. In addition, as a dual-mode drive, NIR laser and NO can promote the penetration ability of nanomotors at tumor sites. The experimental results in vivo show that the drug nanoplatform had good biosafety and significant tumor killing effect triggered by NIR light and acidic conditions of tumor. It provide a promising strategy for the development of advanced drug nanoplatform for cancer therapy.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Zihui Wang,Langming Bai,Jinlong Wang,Heng Liang,Guibai Li
Nanofiltration (NF) based purification technology plays a growing role in water softening, wastewater reuse, and drinking water production , whose core component is the thin-film composite (TFC) polyamide (PA) surface separating layer with high water permeation and significant antifouling and chemical resistance. Strengthening water transport with simultaneously improving chemical tolerance and fouling resistance accords with the demands for sustainable water treatment. In this work, a photo-assisted crosslinked NF membrane with a regulated interlaced stripe surface morphology was fabricated through grafting 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) into the PA network during visible light irradiation. Surface structures and chemical features were characterized, and the NF performance, antifouling and chlorine resistance were systematically evaluated. The optimal membrane with AMPS molecules carrying sulfonyl groups crosslinked in the PA network was rendered electronegative charge, uniformly narrowed pore size, improved hydrophilicity, and higher crosslinking degree. The water permeation was augmented to 30.5 L m −2 h −1 ·bar −1 for the optimal membrane, four times more advanced than the pristine membrane with a water permeability of 5.9 L m −2 h −1 ·bar −1 , and the divalent salt retention was improved to 99.7%. In addition, the optimal membrane also exhibited outstanding chlorine tolerance, fouling removal, and antifouling capacity. The flux recovery ratio ( FRR ) of the best membrane outperformed that of the pristine membrane and the flux declined more slowly in the whole fouling cycle testing. This work provides a novel avenue for fabricating high-efficiency TFC membranes with great water permeation and fouling resistance.
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