CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaoyi Dong,Zhaoyi Yin,Liang Xu,Junhao Ma,Haomiao Cao,Yongjin Li,Qi Wang,Jin Han,Jianbei Qiu,Zhengwen Yang,Zhiguo Song
To achieve efficient degradation of organic pollutants, two critical objectives are enhancing photogenerated carrier separation and expanding the spectral response range. In this study, we synthesized atom-sharing Bi/Bi 4 O 5 Br 2 :Yb 3+ ,Tm 3+ (Bi/BYT) heterojunctions with surface plasmon resonance (SPR) effects and upconversion (UC) by employing self-sacrificial Bi 4 O 5 Br 2 :Yb 3+ ,Tm 3+ (BYT) fractions as a source of metallic Bi. Results revealed that the optimal Bi/BYT-2 catalyst exhibited the highest BPA degradation efficiency within 120 min, representing a significant 1.3-fold improvement over BYT alone. This outstanding catalytic performance can be attributed to the synergistic interplay between UC fluorescence, the unique SPR effect of Bi metal, and the atom-sharing heterojunction. These factors effectively broaden the spectral absorption range and significantly enhance the separation and utilization efficiency of photoinduced carriers. This study lays the groundwork for the development and design of novel atomic-level contact heterojunctions, offering insights into enhancing photocatalytic efficiency through plasmon resonance and UC fluorescence on non-precious metal surfaces.
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Advanced Healthcare Materials
·
2023
·
IF 10
Lin Zhang,Jin-Mei Fu,Lai-Bo Song,Kai Cheng,Fang Zhang,Wen-Hui Tan,Jin-Xuan Fan,Yuan-Di Zhao
Multi-modal combination therapy for tumor is expected to have superior therapeutic effect compared with monotherapy. In this study, a super-small bismuth/copper-gallic acid coordination polymer nanoparticle (BCN) protected by polyvinylpyrrolidone is designed, which is co-encapsulated with glucose oxidase (GOX) by phospholipid to obtain nanoprobe BCGN@L. It shows that BCN has an average size of 1.8 ± 0.7 nm, and photothermal conversion of BCGN@L is 31.35% for photothermal imaging and photothermal therapy (PTT). During the treatment process of 4T1 tumor-bearing nude mice, GOX catalyzes glucose in the tumor to generate gluconic acid and hydrogen peroxide (H 2 O 2 ), which reacts with copper ions (Cu 2+ ) to produce toxic hydroxyl radicals (•OH) for chemodynamic therapy (CDT) and new fresh oxygen (O 2 ) to supply to GOX for further catalysis, preventing tumor hypoxia. These reactions increase glucose depletion for starvation therapy , decrease heat shock protein expression, and enhance tumor sensitivity to low-temperature PTT. The in vitro and in vivo results demonstrate that the combination of CDT with other treatments produces excellent tumor growth inhibition. Blood biochemistry and histology analysis suggests that the nanoprobe has negligible toxicity. All the positive results reveal that the nanoprobe can be a promising approach for incorporation into multi-modal anticancer therapy.
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SYNTHETIC METALS
·
2020
·
IF 3.286
Anfeng Zhu,Honglong Xing,Qi Fan,Xiaoli Ji,Ping Yang
Sheet aluminum powder was used as the substrate and aniline as the polymer monomer, to design novel Al/PANI composites via in-situ polymerization, which exhibited high electromagnetic wave absorption properties and low infrared emissivity. These unique bifunctional composite were systematically characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy , scanning electron microscope, IR-2 dual-band emission rate measuring instrument and vector network analyzer. The calculated results showed that the maximum reflection loss value of Al/PANI composite reached −46.09 dB at 14.56 GHz with a film thickness of only 1.0 mm. Meanwhile, the infrared emission rate of the composite was 0.55. The excellent electromagnetic absorption performance may be ascribed to its superior conductivity and unique structure. The merits of as-synthesized composites with high-performance microwave absorbing properties and low infrared emissivity indicate the potential use of Al/PANI composites in the applicable stealth fields.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Peng Zhang,Yu Huang,Yongfang Rao,Meijuan Chen,Xinwei Li,Wingkei Ho,Shuncheng Lee,Junji Cao
Bulk materials with a microporous structure are adverse to light adsorption, photoelectron and reactant transport in a photocatalytic reaction. Mesoporous photocatalysts have shown many marked advantages in photocatalytic fields. Herein, uniform mesoporous Bi@Bi 2 O 3 nanospheres were fabricated by HCl–ethanol chemical etching at low temperature (60 °C). The obtained mesoporous photocatalysis increased the NO removal efficiency (16%) and inhibited toxic NO 2 generation (3%) under visible light irradiation. Further oxidation of Bi and calcination at high temperatures were avoided during template removal. Moreover, the as-prepared sample possessed a remarkably narrower pore size distribution (3.2–3.9 nm) and stronger light and NO adsorption ability than the bulk microporous Bi@Bi 2 O 3 . Work function and the electron spin resonance test results also indicated that the position of the entire energy bands on Bi 2 O 3 was lowered. The amount of reactive oxygen species generated over the uniform mesoporous structure was higher than that over bulk Bi@Bi 2 O 3 . However, photoelectrochemical measurements indicated that the separation efficiencies of the photo-generated carriers were not improved over the uniform mesoporous Bi@Bi 2 O 3 . Comprehensive studies have shown that the oxidation ability rather than the enhanced separation efficiency of charge carriers accounted for the enhanced photocatalytic activity. This work elucidates the roles of a uniform mesoporous structure in NO x photocatalytic oxidation and provides an efficient strategy for structural engineering in preparing highly reactive and practical photocatalysts.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 11
·1-8
·
IF 6.232
Zou Jin,Zhong Wei,Gao Feng,Tu Xiaolong,Chen Shangxing,Huang Xigen,Wang Xiaoqiang,Lu Limin,Yu Yongfang
A multilayer Bi-BTC/reduced graphene oxide (Bi-BTC/rGO) (BTC, 1,3,5-benzenetricarboxylic acid) film electrode was adopted to construct a highly sensitive Pb 2+ electrochemical sensor. The multilayer Bi-BTC/rGO films were prepared via alternate cast of Bi-BTC and graphene oxide (GO) on a glassy carbon electrode, followed by electro-reduction of the GO components. Bi-BTC has porous broom-like structure and its organic ligand has abundant functional groups, which are favorable for Pb 2+ adsorption and preconcentration. The introduction of rGO layer improves the conductivity of the MOFs material. Moreover, the multilayer composite structure greatly increased the exposure of active sites and the surface area of reactive contact, finally realizing the highly sensitive detection of Pb 2+ . Pb 2+ was determined by differential pulse anodic stripping voltammetry and the response current was recorded at − 0.62 V. The [Bi-BTC/rGO] 2 electrode provides a wide linear response ranging from 0.062 to 20.72 μg/L and a low limit of detection (LOD) of 0.021 μg/L (S/N = 3) for Pb 2+ , which is lower than the guideline value proposed by the World Health Organization. The method has been applied to determine Pb 2+ in industrial wastewater with recoveries of 99.2–104% and RSDs of 3.4–4.0% ( n = 3).
Graphical abstract Graphical abstract Schematic representation of an electrochemical sensor for the detection of Pb 2+ was designed based on long broom-like structure bismuth(II) metallic organic framework/reduced graphene oxide ([Bi-BTC /rGO] 2 )
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Yao Huang,Zhenluan Xue,Songjun Zeng
The development of stimuli-responsive multifunctional nanocarriers for therapeutic drug delivery is extremely desirable for highly specific treatment of disease. Herein, thiol–polyethylene glycol–folate acid-modified hollow mesoporous bismuth nanoshells (HM-Bi@PEG–FA NSs) were developed as the new dual-stimuli-responsive single-“elemental” photothermal nanocarriers for synergistic chemo-photothermal therapy of tumor. The designed hollow-mesoporous-type nanocarriers present excellent photothermal conversion capacity (∼34.72%) and good biocompatibility. Meanwhile, acidic pH and near-infrared (NIR) laser dual-stimulated doxorubicin (DOX) release is successfully achieved. More importantly, the DOX-loaded HM-Bi@PEG–FA NSs hold an efficient in vitro/in vivo antitumor effect through the synergistic chemo-photothermal therapy. Therefore, our findings provide the possibility of designing a dual-stimuli-responsive hollow mesoporous Bi-based photothermal nanocarrier for synergistically enhanced antitumor therapy.
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Catalysts
·
2021
·Vol. 11
·期 9
·1126
·
IF 4.146
Qingman Li,Qihua Jiang,Pengcheng Gu,Lianju Ma,Yiwu Wang
Ni2+-NTA-boosted magnetic porous silica nanoparticles (Ni@MSN) to serve as ideal support for bi-functional enzyme were fabricated for the first time. The versatility of this support was validated by one-step purification and immobilization of bi-functional enzyme MLG consisting of 3-Quinuclidinone reductase and glucose dehydrogenase, which can simultaneously catalyze both carbonyl reduction and cofactor regeneration, to fabricate an artificial bi-functional nanobiocatalyst (namely, MLG-Ni@MSN). The enzyme loading of 71.7 mg/g support and 92.7% immobilization efficiency were obtained. Moreover, the immobilized MLG showed wider pH and temperature tolerance and greater storage stability than free MLG under the same conditions. The nanosystem was employed as biocatalyst to accomplish the 3-quinuclidinone (70 g/L) to (R)-3-quinuclidinol biotransformation in 100% conversion yield with >99% selectivity within 6 h and simultaneous cofactor regeneration. Furthermore, the immobilized MLG retained up to 80.3% (carbonyl reduction) and 78.0% (cofactor regeneration) of the initial activity after being recycled eight times. In addition, the MLG-Ni@MSN system exhibited almost no enzyme leaching during biotransformation and recycling. Therefore, we have reason to believe that the Ni@MSN support gave great promise for constructing a new biocatalytic nanosystem with multifunctional enzymes to achieve some other complex bioconversions.Keywords:porous silica nanoparticles;immobilized enzyme;nanosystem;cofactor regeneration;(R)-3-quinuclidinol;biocatalysts’ recycling
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Small
·
2019
·Vol. 15
·期 47
·1903233
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IF 10.856
Ye Zhang,Feng Zhang,Leiming Wu,Yupeng Zhang,Weichun Huang,Yanfeng Tang,Lanping Hu,Pu Huang,Xiuwen Zhang,Han Zhang
Van der Waals (vdW)-integrated heterojunctions have been widely investigated in optoelectronics due to their superior photoelectric conversion capability. In this work, 0D bismuth quantum dots (Bi QDs)-decorated 1D tellurium nanotubes (Te NTs) vdW heterojunctions (Te@Bi vdWHs) are constructed by a facile bottom-up assembly process. Transient absorption spectroscopy suggests that Te@Bi vdWH is a promising candidate for new-generation optoelectronic devices with fast response properties. The subsequent experiments and density functional theory calculations demonstrate the vdW interaction between Te NTs and Bi QDs, as well as the enhanced optoelectronic characteristics owing to the plasma effects at the interface between Te NTs and Bi QDs. Moreover, Te@Bi vdWHs-based photodetectors show significantly improved photoresponse behavior in the ultraviolet region compared to pristine Te NTs or Bi QDs-based photodetectors. The proposed integration of vdWHs is expected to pave the way for constructing new nanoscale heterodevices.
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Journal of CO2 Utilization
·
2019
·
IF 5.189
Qingqing Li,Xurui Zhang,Xiaodong Zhou,Qingyu Li,Hongqiang Wang,Jin Yi,Yuyu Liu,Jiujun Zhang
Electrocatalytic CO 2 reduction to produce low-carbon chemicals/fuels is one of the most important approaches for CO 2 emissions reduction and utilization. However, the insufficient catalytic activity, stability and selectivity of the electrocatalysts have been identified to be a major challenge. In this work, novel Bi-MWCNT-COOH/Cu catalysts are prepared via a facile co-electrodeposition technique on copper foil to obtain catalyst electrodes for selectively electro-catalyzing CO 2 reduction to produce formic acid (HCOOH). The as-prepared electrodes exhibited high catalytic activity, stability and selectivity toward the production of HCOOH. The faradaic efficiency for HCOOH production can reach values up to 91.7 % at ―0.76 V vs. RHE, with no obvious degradation after 12 h of continuous electrolysis. The proposed electrodeposition technique to produce composite catalyst electrodes is characterized by simplicity, rapidity, and cost-effectiveness, being promising for scaled-up industrial applications.
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NANOTECHNOLOGY
·
2018
·Vol. 29
·期 33
·334001
·
IF 3.404
Hao Huang,Huiyi Li,Huaiyu Wang,Jia Li,Penghui Li,Qidan Chen,Yue Chen,Paul K Chu,Bo Li,Xue-Feng Yu
We report a modified synthesis route of colloidal gold nanorods (AuNRs) by combining the thermal re-shaping treatment and bi-surfactant modification using hexadecyltrimethylammonium bromide (CTAB) and sodium oleate (NaOL). Aspect ratios down to 1.3 ± 0.1 can be achieved in addition to good monodispersity, uniformity, and chemical stability of the materials. Furthermore, without needing post-treatment, metal ions directly interact with the AuNRs efficiently, allowing rapid and sensitive colorimetric detection of heavy metal ions such as Pb2+ and Cu2+ with a low concentration down to 2.5 μM. The detection performance in terms of selectivity, sensitivity and stability is systematically evaluated. The AuNRs with tunable aspect ratios as well as chemical stability have potential in surface-plasmon-based applications such as biochemical sensing, biochemical imaging, medical diagnostics, and cancer therapy.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xinna Gao,Xueyan Wang,Zheng Yang,Yuhua Shen,Anjian Xie
A novel multi-functional yolk-shell SiO 2 @TiO 2 /CDs(y-STCs) nanocomposite with interesting structure of SiO 2 cores, porous TiO 2 shell, and cavities was synthesized by using a simple method. The experimental results indicate that the yolk-shell structure and modification of carbon dots (CDs) play important roles in the enhancement of SERS signals and photocatalytic performance. The y-STCs nanocomposite used as the SERS substrate showed excellent efficiency and reproducibility for the detection of rhodamine 6G (R6G). The detection limit of R6G was shown to be as low as 6 × 10 −8 M. Furthermore, the fabricated y-STCs nanocomposite utilized as the photocatalytst for the degradation of dinitraphenols (DNP) can greatly shorten reaction time to 120 min compared with previous studies, and the DNP degradation rate could reach 96% under simulated sunlight irradiation. The y-STCs nanospheres also possessed excellent cycle stability for the photocatalytic degradation of DNP. Thus, the bi-functional y-STCs nanocomposite may have potential applications in the detection and photocatalytic degradation of organic pollutants.
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LAB ON A CHIP
·
2015
·Vol. 15
·期 17
·3481-3494
·
IF 6.115
Hui Zhao,Lyu Zhou,Qiang Zhang,Xiaoying Zhou,Yonghui Zhang,Huijun Chen,Yanan Du
Phenotypic screening has regained momentum in the pharmaceutical industry owing to its success over target-based screening. Most phenotypic screening relies on nonspecific biochemical readouts regarding cellular viability, which hampers the discovery of novel drug mechanisms of action (MOAs). Here we present a Contractility-based bi-Content micro-Collagen Chip (3CChip), which establishes cellular contractility as a biomechanics-related phenotype for drug screening. Bi-content analysis of cell contractility (imaged by iPhone) and viability suggests that the label-free contractility-based analysis exhibits superior sensitivity to compounds targeting contractile elements (e.g. focal adhesion, cytoskeleton), resulting in a enlarged target pool for drug assessment. Six typical readout patterns of drug response are summarized according to the relative positions of the contraction/viability curves, and drug targets are profiled into three categories (biomechanical, biochemical and housekeeping) by 3CChip, which will benefit subsequent target identification. The simple-to-use and effective 3CChip offers a robust platform for micro-tissue-based functional screening and may lead to a new era of mechanism-informed phenotypic drug discovery.
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