Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Zideng Dai,Xinyu Xu,Zhaoming Guo,Kun Zheng,Xue-Zhi Song,Xiuyu Qi,Zhenquan Tan
Ultra-thin two-dimensional nanosheets have attracted increasing attention due to their great application prospects in nanomaterial science and biomedicine. Herein, we report the preparation of exfoliated raw and oxidized 4-layer Ti 7 O 13 (O-Ti 7 O 13 ) and their ability to produce reactive oxygen species (ROS). The results show that O-Ti 7 O 13 nanosheets can effectively produce ROS induced by X-ray irradiation. The 4-layer nanosheets can quickly load doxorubicin (DOX) within 5 min with a high loading rate to obtain a novel nanodrug system through their electrostatic adsorption capacity, and they exhibit a sustained release behavior. In this way, chemotherapy, radiation therapy and photodynamic therapy effectively combine for cancer synergistic treatment. We evaluated the cytotoxicity, cellular uptake and intracellular location of the O-Ti 7 O 13 nanosheet-based drug delivery system in A549 lung cancer cells. Our results show that the O-Ti 7 O 13 /DOX complex is more cytotoxic to A549 cells than free DOX since a low concentration of loaded DOX (10 μg/mL) with a low dose of X-rays can cause the complete apoptosis of tumor cells. This work reveals that the therapeutic effect of DOX-loaded O-Ti 7 O 13 nanosheets is strongly dependent on their loading mode, and the effects of chemotherapy and photodynamic therapy are enhanced under X-ray irradiation, which allows O-Ti 7 O 13 nanosheet use as a photo-activated drug carrier. This work provides a new strategy for preparing 2D metal oxide nanosheets toward biomedical applications.
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高影响因子
MAIN GROUP CHEMISTRY
·
2020
·Vol. 19
·期 3
·217-225
·
IF 0.845
Qiao Gui-Ying,Li Su-Min,Niu Yun-Yin
One new compound consisting of 1,1-bis(4-pyridylthio)methylene ([Bpytm]) ligand, namely [Bpytm]CuI (1), has been prepared and characterized by IR spectroscopy, solid Uv-visible diffuse reflectance spectrum, and X-ray Powder Diffraction (PXRD). Compound 1 is a 2D MOF and ligand [Bpytm] coordinate with metal ions to form tetrahedral configuration. For compound 1: Crystal system: Monoclinic, Space group: C2/c, a = 13.6671(11), b = 11.6075(11), c = 17.1225(12), α= 90°, β= 93.707(3)°, γ= 90°, V = 2710.6(4) Å3, Z = 8, Dcalc = 2.082 g cm–3. The photocatalytic properties and thermal stability have been researched.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
·
IF 5.162
Jie Hao,Fangxia Wu,Rong Tang,Yuanyuan Sun,Dehua Liu,Zhenqing Zhang
Oxidized starch (oxStarch) is a major derivative of starch. In present study, 4-acetamide-TEMPO system was firstly applied to prepare specifically oxidized starch, homogeneous 1,4-linked α-D-glucuronan. The impact of oxidant amount, 4-acetamide-TEMPO amount and reaction temperature on the properties of products were investigated. The product structures were characterized with 1 H NMR for degree of oxidation (DO), SEC-MALS for MW, MS for analysis of oxidized oligosaccharides , and in-source fragmented MS for analysis of oxidized polysaccharides . The results showed that the DO of oxStarches increased, but their MWs decreased with the raise of oxidant amount; higher 4-acetamide-TEMPO amount provided higher efficiency of specific oxidation of starch, in which the product has higher DO and MW; no significant difference have been observed between the oxStarches oxidized at 4 and 25 °C, but significant degradation was observed at 50 °C. In each product, having a MW distribution, the portion with smaller size has higher DO. While some unspecific oxidation was still observed observed on the second hydroxyl groups of sugar ring in the following order of priority, position 3 > 2 > 1 > 0.
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高影响因子
OPTICS AND LASER TECHNOLOGY
·
2020
·
IF 3.233
Gulgina Mamtmin,Nuerguli Kari,Renagul Abdurahman,Patima Nizamidin,Abliz Yimit
Optical waveguide (OWG) sensors are widely used in gas detection, and sensitive materials are the key factors affecting sensor performance. Herein, we report on a 5,10,15,20-tetrakis-(4-methoxyphenyl) porphyrin (TMP) deposited optical wave guide (OWG) sensor. The porphyrin solutions with different acidity were deposited on a K + -ion exchanged glass OWG surface by spin coating, to fabricate porphyrin film-coated OWG gas sensing devices. The effects of pH values of the porphyrin solution used to prepare the sensitive film on the sensing properties of these devices were investigated. The gas sensitive performances of these devices in response to analytes were compared. Among them, the sensing devices fabricated using original and acidic solutions of porphyrin exhibited significant responses to sulfide gases and ethanediamine, respectively. The sensing device prepared using an acidic solution has a good response to ethanediamine gas (response and recovery times of the sensor for 1 ppm of EDA (ΔI = 48) are 13 and 38 s, respectively). The RSD of the output light intensity is ±2.84, the signal to noise ratio (S/N) is 5.6. The device prepared using the original solution has an excellent response to sulfide gases (H 2 S, SO 2 ), and can detect low concentration levels (ppm) of sulfide gases. These sensing devices thus have the potential to be used in food quality testing and environmental monitoring.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Quan Gan,Huijie Hou,Sha Liang,Jingjing Qiu,Shuangyi Tao,Liang Yang,Wenbo Yu,Keke Xiao,Bingchuan Liu,Jingping Hu,Yanfei Wang,Jiakuan Yang
Fe-rich biochar with multivalent iron compounds (Fe 0 , Fe 0.95 C 0.05 , Fe 3 O 4 , and FeAl 2 O 4 ) pyrolyzed from sludge cake conditioned with Fenton's reagent and red mud was utilized as an efficient Fenton catalyst for the degradation of 4-chlorophenol (4-CP). Effects of pyrolysis temperature and sludge conditioner composition on the transformation of iron compounds were studied. Both homogeneous Fenton reaction initiated by Fe 2+ leached from both low-valent Fe 0 and Fe 0.95 C 0.05 , and heterogeneous Fenton reaction initiated by solid iron phases of Fe 3 O 4 and FeAl 2 O 4 were revealed to contribute to the degradation of 4-CP. The removal efficiency of 4-CP remained 100% after five successive degradation rounds. The homogeneous Fenton reaction mainly works in the first degradation round, and the heterogeneous Fenton reaction dominates in subsequent degradation rounds. The findings of this study suggest that sewage sludge derived Fe-rich biochar could be utilized as an efficient Fenton catalyst for recalcitrant organics degradation .
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高影响因子
ENVIRONMENT INTERNATIONAL
·
2020
·
IF 7.577
Song Li,Jingchun Tang,Qinglong Liu,Xiaomei Liu,Bin Gao
Nano zero-valent iron (nZVI) and its composite materials have been extensively studied in the field of environmental remediation. However, the oxidation and agglomeration of nZVI limits the large-scale application of nZVI in environmental remediation. This study developed a two-step method to prepare stable carbon-coated nZVI (Fe 0 @C) which combined hydrothermal carbonization and carbothermal reduction methods and used glucose and iron oxide (Fe 3 O 4 ) as precursors. When the carbothermal reduction temperature was 700 °C and the elemental molar ratio of carbon to iron was 22:1, stable Fe 0 @C can be generated. The nZVI particles are encapsulated by mesoporous carbon and embedded in the carbon spheres. The unique structure of carbon coating not only inhibits the agglomeration of nZVI, but also makes nZVI stable in air for more than 120 days. Not only that, the as-synthesized Fe 0 @C exhibited high catalytic activity toward the degradation of 4-chlorophenol (4-CP) by activating persulfate. Different from conventional nZVI catalysts in generation of sulfate radicals, Fe 0 @C selectively induced hydroxyl radicals for 4-CP degradation. Moreover, Fe 0 @C has been shown to efficiently degrade 4-CP by using the dissolved oxygen in water to form hydroxyl radicals. This study not only provides a simple, green method for the preparation of stabilized nZVI, but also provides the possibility of large-scale application of nZVI in the field of environmental remediation.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 26
·11336-11341
·
IF 3.288
Dongying Shi,Chao-Jie Cui,Chun-Xiao Sun,Jun-Ping Du,Chun-Sen Liu
A new [Co21(H2O)4(OH)12]30+ unit-incorporating polyoxotungstate, Na18[Co(H2O)6]2{[Na(H2O)4]2[Na(H2O)2]2[Co(H2O)3]2[Co21(H2O)4(OH)12](SiW10O37)6}·24H2O (denoted as Co25Si6W60), has been hydrothermally synthesized and fully characterized via elemental analyses, thermogravimetric analysis, bond valence sum (BVS) calculations, IR spectrum, UV-vis spectrum, diffuse reflectance spectrum, powder X-ray diffraction and single-crystal structural analysis. The most remarkable feature is that the gigantic [Co21(H2O)4(OH)12(SiW10O37)6]30− core in Co25Si6W60 is composed of a square-like [Co21(H2O)4(OH)12]30+ nanosheet encapsulated by six dilacunary Keggin [α-SiW10O37]10− moieties in a staggered fashion, resulting in a remarkable sandwich-type assembly. Furthermore, the unique Co25Si6W60-based biosensing system, as a simple, rapid, and highly sensitive electrochemical platform, offers an environmentally friendly route for detecting dichlorvos in the field of both food safety and environmental pollution.
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ENVIRONMENTAL ENGINEERING SCIENCE
·
2020
·Vol. 37
·期 7
·497-508
·
IF 1.681
Shijie Sun,Hongyu Deng,Jinfeng Yang,Dongxu Zhou,Xing Wan,Fengxia Han
Dissolved organic matter can be a photosensitizer in photodegradation processes. It can produce hydroxyl radicals, singlet oxygen, and triplet-state dissolved organic matter, which promote pollutant degradation. This study investigated to what extent the triplet substances and other active substances can, under irradiation, stimulate peroxides to produce more reactive species (RS), which accelerate the degradation of pollutants. The photodegradation of butyl 4-hydroxybenzoate (BP) was studied in the presence of dissolved organic matter (DOM) and persulfate (PDS), peroxymonosulfate (PMS), or hydrogen peroxide (H2O2). The peroxides promoted the photodegradation in the order PDS > H2O2 > PMS. The degradation rates were peroxide > DOM-mediated peroxide > DOM. The interaction of DOM with peroxide produced more RS to promote the degradation. Chlorella vulgaris were used to evaluate the toxicity of the treated effluent and the ecological risk was found to be low. The findings explain the mechanism of the photodegradation of BP in the presence of dissolved organics and peroxides.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-7
·
IF 6.232
Sun Ye,Zhang Yao,Wang Yue,Xia Lixin
A new sensor for determination of Ag + ion (Ag + ) by surface-enhanced Raman scattering (SERS) is reported. Gold nanoparticles (AuNPs) and 4-aminodiphenyl disulfide (APDS) were chosen as the SERS substrate and probe molecule, respectively. With the addition of Ag + , three new peaks (1141, 1392, and 1435 cm −1 ) appeared in the SERS spectrum, indicating that the conversion of APDS to p , p ′-dimercaptoazobenzene (DMAB) was achieved. As the concentration of Ag + increased, the conversion of APDS to DMAB also increased and showed a good linear relationship ( R 2 = 0.9746) in the range of 10 to 100 μM of Ag + . The limit of detection (LOD) was 7 μM. Compared with the traditional determination method, the SERS method is convenient and fast and requires no complicated preprocessing.
Graphical abstract
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Jiyang Liu,Haojie Yu,Li Wang
The catalysis performance of noble metal nanoparticles always suffered from harsh aggregation during reaction hence promising supports that were able to restrict as well disperse the NPs were in great demand. Herein we reported a bottom-up synthesis of ultrathin two dimensional ferrocene based metal-organic framework (FMOF) nanosheets employing ZrCl 4 and 1,1′-ferrocene-dicarboxylic acid as metal nodes and organic ligands respectively. Employed as a stable and easy-contacted support, Au NPs were reduced and attached on the surface of FMOF nanosheets with average diameter of ca. 5 nm. The obtained Au/MOF composite was used in the reduction of 4-nitrophenol to 4-aminophenol, and rapid conversion of almost 100% could be achieved in 5 min with a maximum TOF of 10.9 × 10 −4 mol min −1 m 2 . Moreover, after 10 cycles of the reusability test, there was no obvious decline in catalytic performance with conversion of almost 100%, confirming the unprecedented stability of this Au-MOF composite.
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Cai-Xia Li,Yue-Nan Hong,Bin Yang,Shan-Tao Zhang,Dan-Qing Liu,Xi-Ming Wang,Qian Liu,Lei Zhao,Wen-Wu Cao
Ba 0.70 Ca 0.30 Ti 1- x (Nb 0.5 Fe 0.5 ) x O 3 lead-free ceramics (abbreviated as BCTNF x , x = 0–0.12) were prepared by solid-state reaction method. The influence of B-site (Fe 0.5 Nb 0.5 ) 4+ substitution on phase structure, microstructure, dielectric , ferroelectric and piezoelectric properties of Ba 0.70 Ca 0.30 TiO 3 ceramics were systematically studied. The BCTNF x ceramics consist of diphasic tetragonal (T) and orthorhombic (O) phases at x = 0–0.04, pseudocubic (PC) and O phases at x = 0.05–0.08, cubic (C) and O phases at 0.08 < x ≤ 0.12. Increase of (Fe 0.5 Nb 0.5 ) 4+ doping improves sinterability, depresses the ferroelectric - paraelectric phase transition temperature ( T m ) monotonically from 128 °C at x = 0 to -86 °C at x = 0.12, induces enhanced relaxor behavior and weakens piezoelectric properties. The room temperature relative dielectric constant ( ε r ) and dielectric loss tangent (tan δ ) increase with increasing x and reach the maximum values of 4869 and 0.06 respectively at x = 0.06. Whereas the average grain size (abbreviated as AGS), ferroelectric properties and electric field induced strain increase significantly by introducing 2.0 mol% B-site complex cations (Fe 0.5 Nb 0.5 ) 4+ into Ba 0.70 Ca 0.30 TiO 3 ceramics. The BCTNF0.02 ceramics achieve optimal electrical properties with ε r = 1268, tan δ = 0.03, T m = 102 °C, P max = 12.8 μC/cm 2 , P r = 6.1 μC/cm 2 , E C = 6.0 kV/cm, d 33 = 117 pC/N, k p % = 0.18%, Q m = 236, bipolar S max % = 0.20%, unipolar S max % = 0.16% and d 33 ∗ = 314 pm/V. The variation of electrical properties of BCTNF x ceramics is attributed to the combined action of grain size effect, phase transition, weakness of octahedral distortion, clamping effects of the internal bias electric field E i on domain wall motion induced by B-site cations (Fe 0.5 Nb 0.5 ) 4+ displacement.
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Sustainable Energy & Fuels
·
2019
·Vol. 4
·期 4
·1621-1629
·
IF 4.912
Yachao Du,Qingwen Tian,Jin Huang,Yuechao Zhao,Xiaohuan Chang,Afei Zhang,Sixin Wu
Additional elements in Cu2ZnSn(S,Se)4 (CZTSSe) absorber layers present a viable strategy to improve the performance of thin film solar cells. In this study, heterovalent cation doping by partially substituting metal cations with Ga3+ is explored by constructing a sandwich-like configuration. We demonstrated that a low doping level of Ga3+ can be successfully incorporated into the host lattice of CZTSSe to form a homogeneous Cu2ZnSn(Ga) (S,Se)4 (CZTGSSe) alloy material. Characterization was performed using SEM, EDS, XRD, Raman spectroscopy, and XPS, which showed that the material fabricated by this heterovalent cation doping method expressed high phase purity, appropriate valence components, and suitable optical bandgap, which are vital for high performance solar cells. As a result, the champion device achieves stabilized efficiency as high as 10.80%, improved by nearly 28% compared with only 8.43% for the reference device.
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