CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Xinhe Liu,Yong Kang,Yi Wang
In this work, novel visible-light responsive β-Bi 2 O 3 /Ag 2 WO 4 p-n heterojunction photocatalysts were prepared by a simple in situ deposition method and characterized using XRD, FT-IR, SEM, TEM, XPS, UV–vis and PL. The uniform deposition of Ag 2 WO 4 particles on β-Bi 2 O 3 flakes to form heterojunctions, exhibited excellent photocatalytic activity for the degradation of methylene blue (MB) under visible light in 30 min. Compared with pure β-Bi 2 O 3 and Ag 2 WO 4 samples, the kinetic reaction rate constant of MB degradation by β-Bi 2 O 3 /Ag 2 WO 4 was 48.47 times higher than that of β-Bi 2 O 3 , and the degradation rate was as high as 98.8% with good cycling stability.
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JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Yi Liu,Ying Chen,Yunli Liu,Zewen Chen,Huan Yang,Zhongxiao Yue,Qing Fang,Yunfei Zhi,Shaoyun Shan
Solar energy is considered as the cleanest, cheapest, and most sustainable energy source, and CO 2 cycloaddition that is drove by solar energy has unique advantages in the aspect of energy and environmental. Therefore, Zn and N co-doped porous carbon nanosheets (ZNCs), which were synthesized by a simple one-step pyrolysis method, as catalysts and photothermal material to photothermally drive cycloaddition of CO 2 . The prepared ZNCs show graphene-like layered structure, uniformly distributed Lewis acid (Zn atoms) sites and Lewis base (N atoms) sites, full spectrum absorption and high photothermal conversion efficiency. More importantly, ZNCs have a higher catalytic efficiency than traditional heating methods because it can be quickly in-situ heated by light, hence the yield of cyclic carbonate reached 91.1% (0.1 MPa CO 2 , 1000 mW·cm −2 full-spectrum irradiation, 12 h). ZNCs were recycled five times without significant reduction in catalytic efficiency, and have high activity to other series of epoxides. A possible CO 2 cycloaddition mechanism which is catalyzed by ZNCs is proposed, including the step of adsorption, ring opening, insertion and cyclic carbonates formation.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 6
·2296-2303
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IF 4.569
Xiaoyan Wu,Mingsheng Xu,Shuna Wang,Khurram Abbas,Xin Huang,Renquan Zhang,Antonio Claudio Tedesco,Hong Bi
Photodynamic therapy (PDT) is a promising and emerging method for the treatment of cancer. Usually, Type II PDT is used in the clinic, and mainly involves three key elements: a photosensitizer, molecular oxygen and laser light. However, it is known that tumor tissue is deficient in oxygen molecules which is why Type I PDT is mostly preferred in the therapy of tumors in which the hypoxic tissue plays a major role. Fluorescent carbon dots (CDs) have shown great potential in cancer theranostics, acting as bioimaging agents and photosensitizers. Herein, we have synthesized novel kinds of fluorine and nitrogen co-doped carbon dots (F,NCDs) that emit bright green fluorescence under ultra-violet light. The F,NCDs have excellent water solubility and low cytotoxicity. They can generate hydroxyl radicals (˙OH) and superoxide anions (˙O2−) under LED light (400–500 nm, 15 mW cm−2) irradiation, making them ideal photosensitizers for Type I PDT. Furthermore, upon using the HepG2 cell line as an in vitro model, the F,NCDs exhibit a better cell imaging effect and higher PDT efficiency than the control sample of CDs without F and N doping. This work has illustrated that the F,NCDs are promising in achieving the image-guided PDT of cancers, usually in a hypoxia tumor microenvironment.
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APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Xing Li,Ya Wen,Yulian Zhang,Zhiqiang Ge
Insect pheromone is a class of natural non-toxic and harmless biological pesticide. To improve the utilization efficiency of the pheromone pesticides, controlled release in response to circadian rhythm of insects is a feasible approach because some insects act and release pheromones with a circadian rhythm. Thus, myrcene, as the insect pheromone model, was first loaded into the hollow nano-cavity of halloysite nanotubes (Hal), which were further enclosed with melted n-octadecane as a coating to form a composite (PMHal). The latter was simply blended into chitosan solution to cast a chitosan composite film (PMHal@CS) for preventing n-octadecane leakage during the phase change process . The effects of temperature change on the release rate of myrcene from the composite film were evaluated. Results showed the combination of Hal with n-octadecane could significantly slow the release rate of myrcene from the composite film when the ambient temperature was below 15 °C. If the ambient temperature was near to the melting point of n-octadecane, the release rate of myrcene would be enhanced. In alternating temperature cycles test of PMHal@CS film, the average release rate of myrcene was 0.65 μg/h at 30 °C and 0.022 μg/h at 15 °C, the persistent temperature sensitivity and good temperature rhythm were still remained after 7 cycles. These results suggested that the composite film had a good controlled release effect on myrcene and could adapt well to the circadian rhythm activity of some insects.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 10
·8767
·
IF 5.6
Shuo Gao,Xiao Lin,Yeqin Shi,Hu Zhou,Xiao Zheng,Mingyu Li,Ting Lin
A new prenylated indole alkaloid—Penicimutamide CN-oxide (1), a new alkaloid penicimutamine A (2), along with six known alkaloids were isolated from an endophytic fungusPallidocercospora crystallina. A simple and accurate method was used to determine the N-O bond in theN-oxide group of1. By using a β-cell ablation diabetic zebrafish model, compounds1,3,5,6and8showed significantly hypoglycemic activities under the concentration of 10 μM. Further studies revealed that compounds1and8lowered the glucose level through promoting glucose uptake in zebrafish. In addition, all eight compounds showed no acute toxicity, teratogenicity, nor vascular toxicity in zebrafish under the concentrations range from 2.5 μΜ to 40 μM. Importantly, these results provide new lead compounds for the development of antidiabetes strategies.Keywords:prenylated indole alkaloid;N-oxides;endophytic fungus;hypoglycemic activity;zebrafish
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Advanced Healthcare Materials
·
2023
·
IF 10
Shang Wu,Yu Shi,Letao Jiang,Wenzhen Bu,Kai Zhang,Wenzheng Lin,Chun Pan,Zhuobin Xu,Jianwei Du,Hao Chen,Huihui Wang
Intervertebral disc degeneration (IVDD) is associated with oxidative stress induced reactive oxygen species (ROS) dynamic equilibrium disturbance. Nanozymes, as nanomaterials with enzyme-like activity, can regulate intro-cellular ROS levels. In this study, a new carbon dots nanozyme, N -acetylcysteine-derived carbon dots (NAC-CDs), is developed and proved to be an ideal antioxidant and anti-senescent agent in IVDD management. The results confirmed the NAC-CDs have satisfactory biocompatibility and strong superoxide dismutase (250 U mg −1 ), catalase, glutathioneperoxidase-like activity, and total antioxidant capacity. Then, the powerful free radical scavenging and antioxidant ability of NAC-CDs are demonstrated in vitro as observing the reduced ROS in H 2 O 2 induced senescent nucleus pulposus cells (NPCs), in which the elimination efficiency of toxic ROS is more than 90%. NAC-CDs also maintained mitochondrial homeostasis and suppressed cellular senescence, subsequently inhibited the expression of inflammatory factors in NPCs. In vivo, evaluations of imaging and tissue morphology assessments suggested that disc height index, magnetic resonance imaging grade and histological score are significantly improved from the degenerative models when NAC-CDs is applied. In conclusion, the study developed a novel carbon dots nanozyme, which efficiently rescues IVDD from ROS induced NPCs senescence and provides a potential strategy in management of IVDD in clinic.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuelong Xu,Jingyue Wang,Shasha Wang,Zuozhao Zhai,Bin Ren,Zhi Tian,Lihui Zhang,Zhenfa Liu
Multifunctional electrocatalysts are desirable for overall water splitting and zinc-air batteries. In this work, N, S co-doped carbon nanotubes (CNT-NS) with a plentiful of defects were obtained through a novel molecular-level codoped and lattice defect construction method. Thiamine hydrochloride and thiocarbamide were adopted as new precursors in situ doping N and S into multi-walled CNTs surfaces, and lattice defects were constructed by in situ chemical etching using ammonium chloride and ammonium bicarbonate . These surface defects and N,S biatom co-doping synergistic effects can accumulate the CNT-NS to exhibit the superior behavior for electrocatalysis of water splitting and zinc-air batteries. The overpotential for overall water splitting was 1.61 V and the specific capacity for zinc-air batteries was 781 mA h g −1 , which was superior to previous works. According to the Operando Raman spectroscopy measurements, the S atoms can serve as the intrinsic catalytic sites for HER and OER , and the defective CNT structures could enhance the catalytic kinetics by the electron-transfer process. Further, density functional theory (DFT) results also indicated the contribution of binary atoms co-doping for low ΔG H∗ values. Therefore, this work provides the valuable reference for rational design/construction for metal-free catalysts of overall water splitting.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Nannan Wang,Jing Li,Jinpei Hei,Xiaodong Chen,Xiaojie Yin,Yang Han,Mingling Li,Lifeng Cui
The defect engineering is of vital importance for electrocatalysts because it can provide an additional yet advanced tier to further boost catalysis, especially for ultrathin nanosheets of transitional metal compounds with a high surface to bulk ratio and more importantly the ability to engineer the defect along the longitudinal direction of the grain boundaries. Herein, we developed super-thin and ordered face-centered cubic VN nanosheets with grain boundaries using a new facile and in-situ method. The structural and morphological properties of the prepared samples were investigated, finding that the temperature has significant effects on the distribution of sheets. The thickness of nanosheets is only 1.3 nm the same as that of three cubic VN crystal unit cells, which is pivotal to the electrochemical reaction . The detailed electrocatalysts results show that the VN nanosheets (NSs) exhibit interesting ORR performance with the onset potential of 0.93 V and a half-wave potential of 0.86 V. The evenly distributed VN NSs display the highest durability with only 5% attenuation after 50000s operation for the oxygen reduction reaction. We provide a new strategy to synthesize super-thin nitrides nanosheet structure, highlighting the strong correlation between surface engineering and the performance of electrocatalysts for potential practical oxygen reactions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xiao-Chun Deng,He-Qiang Chang,Guo-Hua Zhang
Tungsten carbides (W 2 C and WC) materials, as promising non-precious electrocatalysts , possess highly efficient activity for HER . Herein, N-doped graphene supported tungsten carbide (N–W 2 C/WC) nanocomposite is synthesized by spray drying process followed with a two-step pyrolysis treatment , which exhibits a remarkable hydrogen evolution reaction (HER) activity and excellent stability in acidic solution and alkaline solution. N–W 2 C/WC displays low overpotentials of 166 mV and 125 mV to achieve a current density of 10 mA cm −2 and small Tafel slopes of 60.97 and 62.66 mV dec −1 in 0.5 M H 2 SO 4 and 1.0 M KOH, respectively. After 1000 cycles, the electrocatalytic activity of N–W 2 C/WC is almost no change in acidic media but slightly decreases in alkaline media . This work might provide a new way to explore high comprehensive performance tungsten-based electrocatalyst for HER.
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OPTICS EXPRESS
·
2023
·Vol. 32
·期 1
·366-378
·
IF 3.8
Feida Li,Kangning Liu,Jun Dai
Flexible perovskite solar cells (F-PSCs) prevail in the clean energy field for their light weight, easy fabrication and installation, but the power conversion efficiency of F-PSCs needs further improvement. In this work, we numerically simulate and experimentally demonstrate the effect of the perovskite trap defects density on the power conversion efficiency. The pseudo-halide KBF4 is employed as the additive to passivate the trap defects in the perovskite films. The high electrophilicity of BF4- group ensures its entering into perovskite lattice, optimizing crystallinity and improving the qualities of perovskite films, K+ ions can effectively passivate grain boundaries and inhibit halide anion migrations. After KBF4 passivation, trap defect density of the perovskite film was decreased from 8.0 × 1015cm−3 to 3.9 × 1015cm−3, and also the carrier lifetime increased from 108.52 ns to 234.72 ns. Consequently, the power conversion efficiency (PCE) of the F-PSCs devices increased from 13.99% to 16.04%.
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ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Hai-Xia Wu,Lei Tan,Zhao-Wen Tang,Mei-Yan Yang,Jian-Yun Xiao,Chuan-Jun Liu,Ren-Xi Zhuo
This work presented a highly efficient antibacterial Ti-surface which was grafted with poly(N-hydroxyethylacrylamide) (PHEAA) brush and further decorated with triclosan (TCS). The modified surfaces were characterized using contact angle measurements, X-ray photoelectron spectroscopy, and attenuated total reflectance Fourier transform infrared. The antibacterial performance of the modified surfaces was evaluated using the Streptococcus mutans and Actinomyces naeslundii attachment test. The Ti surface with PHEAA brush (Ti-PHEAA) was able to resist the adhesion of the bacteria, while the TCS-decorated Ti surface (Ti-TCS) showed the capability of killing the bacteria adhered on the surface. As we coupled the TCS to the PHEAA brush, the surface showed highly efficient antibacterial performance due to the combination of the resistance to the bacteria adhesion and its activity of killing bacteria.
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ACS Applied Polymer Materials
·
2023
·
IF 5
Li Jiang,Danni Qin,Chengfang Zhang,Jinbin Cui,Xinyue Xu,Rui Hu,Ping Zhang,Liang Hu
Hydrogel sensors that can accurately determine X-ray doses are crucial in the clinic. In this article, we reported radiofluorogenic poly(N-isopropylacrylamide) (pNIPAm)-based microgels for X-ray dose measurements. PNIPAm-based microgels were injected with two fluorescent moieties: hydroxyphenyl fluorescein, which is a radiofluorogenic molecule, and CdSe quantum dots, which were relatively unaffected by X-ray irradiation. Using single-wavelength excitation, our microgels showed a linear change in ratiometric fluorescent signals as a function of increasing the X-ray dose from 0 to 15 Gy. Furthermore, our microgel sensors had good temperature stability (25 to 65 °C) and postirradiation stability within 4 days. Importantly, we harnessed our sensors to determine X-ray doses in soft tissues and B16-F10 cells, to monitor absorbed doses by eye lenses using dedicated accessories for radiation safety glasses, and to verify intestine doses in the 3D-printed abdominal phantom under different radiation energies (160 keV, 225 keV, and 6 MV)/dose rates (1.225, 4, and 4.487 Gy/min). In each case, the doses determined by our sensors are comparable to the results of commercial ionization chambers, thermoluminescent dosimeters, and clinical treatment planning systems. Therefore, we believe our microgel sensors provide a method for clinical-level X-ray dose measurements.
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