CRYSTENGCOMM
·
2021
·Vol. 23
·期 25
·4451-4458
·
IF 3.545
Wenxuan Ma,Shuhua Hao,Lei Zhang,Baoyi Lv,Gang Zhao,Jinzhao Huang,Xijin Xu
CdS is widely used in the field of photocatalysis owing to its excellent photocatalytic H2 evolution (PHE) activity, but the photocatalytic stability of CdS is inhibited because of the drawback of photocorrosion. Under light, the introduction of WS2 cocatalysts induces the growth of layered CdS on the WS2 nanosheets. Through the photocatalytic activity measurement, after adding ultrathin WS2 nanosheets, the amount of H2 released can reach 139.15 mmol g−1 after 7 h, which is 11.3 times higher than that of pure CdS nanoparticles. Furthermore, these composites illustrate excellent light absorption performance in the near-infrared region. A heterojunction is formed between WS2 and CdS under light, which greatly promotes the mobility of interface carriers and limits the recombination of photogenerated carriers. The hydrogen evolution output remains stable after 42 h, and the photocorrosion problem is effectively suppressed. In this work, we provide an effective and simple method to improve photocatalytic activity and stability, which is beneficial to the practical development of photocatalysis.
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Feng Liu,Zeyu Li,Yu Li,Yiyu Feng,Wei Feng
The spin-forbidden nature of triplet exciton transitions is a limitation for achieving a carbon dots-based material with room-temperature phosphorescence (RTP). Here, fluorine-nitrogen co-doped carbon dots (FNCDs), prepared using the solvothermal method and further gas-phase fluorination from fructose and diethylenetriamine (DETA), were found to exhibit RTP lifetime and quantum yield of 1.14 s and 8.3%. By comparing the structure and performance of the nitrogen-doped carbon dots (NCDs) and FNCDs, it was found that the RTP of FNCDs originates from the π→π∗ and n→π∗ electron transitions C–N/C N, which can be attributed to the small energy gap between the singlet and triplet states. We further explored the mechanism of RTP by analyzing the hydrogen bonding between carbon dots and polyvinyl alcohol matrix. The semi-ionic C–F bonds also enhance intramolecular and intermolecular hydrogen bonding and reduce the quenching of RTP without the oxygen barrier. Furthermore, we applied the prepared aqueous FNCDs as an advanced security ink for information printing and anti-counterfeiting.
✓ 已验证
产品关联
DOI
高影响因子
DRUG DELIVERY
·
2021
·
IF 6.419
Mingming Song,Wentao Xia,Zixuan Tao,Bin Zhu,Wenxiang Zhang,Chang Liu,Siyu Chen
Malignant melanoma is a life-threatening form of skin cancer with a low response rate to single-agent chemotherapy. Although combined therapies of metformin (MET) and doxorubicin (DOX) are effective in treating a variety of cancers, including breast cancer, their different physicochemical properties and administration routines reduce the effective co-accumulation of both drugs in tumors. Nanoparticles (NPs) have been demonstrated to potentially improve drug delivery efficiency in cancer therapy of, for example, liver and lung cancers. Hence, in this study, we prepared pH-sensitive, biocompatible, tumor-targeting NPs based on the conjugation of biomaterials, including sodium alginate, cholesterol, and folic acid (FCA). As expected, since cholesterol and folic acid are two essentials, but insufficient, substrates for melanoma growth, we observed that the FCA NPs specifically and highly effectively accumulated in xenograft melanoma tumors. Taking advantage of the FCA NP system, we successfully co-delivered a combination of MET and DOX into melanoma tumors to trigger pyroptosis, apoptosis, and necroptosis (PANoptosis) of the melanoma cells, thus blocking melanoma progression. Combined, the establishment of such an FCA NP system provides a promising vector for effective drug delivery into melanoma and increases the possibility and efficiency of drug combinations for cancer treatment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICA B-CONDENSED MATTER
·
2021
·
IF 2.436
Yihang Dong,Zhaoyang Liu,Lipeng Pang,Ye Han,Shuyu Yao,Xiangnan Wang
{(Y 2 O 3 ) 0·08 (ZrO 2 ) 0.92 } 1- x (CeO 2 ) x (0 ≤ x ≤ 0.6) is synthesized by co-precipitation method. Thermal analysis, phase structure, lattice constant , micro-morphology, elements distribution, density, open porosity and electrical conductivity are measured by TG, DSC , XRD , GSAS, SEM , EDS, Archimedes method and EIS respectively, and the influence of CeO 2 content on the above properties are investigated. TG-DSC results show that the weight loss of the sample is mainly due to the decomposition of the initial powder, forming a solid solution above ~600 °C. XRD results show that {(Y 2 O 3 ) 0·08 (ZrO 2 ) 0.92 } 1- x (CeO 2 ) x (0 ≤ x ≤ 0.6) is a cubic solid solution, and the lattice parameters and volume increase with the increase of CeO 2 content. SEM results show that YZC is a dense sintered body. Density and open porosity of YZC sample are ~4.5 g cm −3 and ~0.12, respectively. The electrical conductivity results show that the conductivity of {(Y 2 O 3 ) 0·08 (ZrO 2 ) 0.92 } 1- x (CeO 2 ) x (0 ≤ x ≤ 0.2) is equivalent, and then the conductivity decreases due to defect association with the increase of CeO 2 content.
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Ang Shen,Guohua Wang,Jinggang Wang,Xiaoqin Zhang,Xuan Fei,Lin Fan,Jin Zhu,Xiaoqing Liu
Poly(1,4-butylene- co -1,4-cyclohexanedimethylene 2,5-furandicarboxylate) (PBCFs) was synthesized from bio-based 2,5-furandicarboxylic acid (FDCA), 1,4-butanediol (BDO) and 1,4-cyclohexanedimethanol (CHDM). The GPC showed that the number average molecular weight ( M n ) of PBCFs were in the range of 38400–44200 g/mol and the average molecular weight ( M w ) varied from 83,000 to 94,800 g/mol with the polydispersity index of 2.22–2.33. The chemical structures, compositions and sequence distributions of PBCFs were confirmed by 1 H NMR and 13 C NMR. Their thermal properties and crystallization behavior were investigated by Differential Scanning Calorimeter (DSC). Results showed that the glass transition temperature ( T g ) and melting temperature ( T m ) of poly(butylene 2,5-furandicarboxylate) (PBF) were increased from 38 and 171.8 °C to 65.8 and 211.7 °C for PBCF-68, respectively. Furthermore, the strength and modulus were increased from 44 and 950 MPa for PBF to 69 and 1360 MPa for PBCF-68 with the mole percentage of CHDM units of 68% in diol units. PBCFs demonstrated much better thermo-mechanical properties when compared with those of PBF, which might be used as the bio-based engineering plastic or excellent packaging materials with high transparency and good gas barrier properties.
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Xueqing Guo,Yang Liu,Wenjuan Dong,Qin Hu,Yong Li,Shaomin Shuang,Chuan Dong,Lishuai Cai,Xiaojuan Gong
Azithromycin (AZM) 1 is one of the most widely used antibiotics. AZM abuse is easy to cause great harm to human body, so developing a rapid and sensitive method to detect AZM is of great importance. Herein, 3-aminothiophenol as only reaction precursor, nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs) 2 were fabricated by one-step hydrothermal carbonization method. All characteristics demonstrate that N,S-CQDs possess good water solubility, high fluorescence stability and low cytotoxicity. Without being disturbed by amino acids and drugs, the most interesting finding is that AZM can efficiently quench the fluorescence of N,S-CQDs by a synergistic effect of electrostatic interaction and static quenching. A fluorescent probe for the detection of AZM was constructed with high selectivity and good sensitivity, achieving two linear ranges of 2.5–32.3 μM and 37.2–110 μM and a limit of detection of 0.76 µM. The proposed fluorescent method was used for the detection of AZM in cells with fulfilling results. More importantly, the fluorescent probe was successfully used to the detection of AZM in tablets and human urine with recovery rate and relative standard deviations of 98.2–104.8% and 0.04–3.46%, respectively, which was confirmed by the standard method of HPLC-UV. This finding illustrates the usefulness and feasibility of N,S-CQDs as an effective fluorescent probe for the detection of AZM in tablets and human urine, which is helpful for supervising and guiding pharmacy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 6
·2178-2189
·
IF 7.393
Menglei Dong,Mengyi Peng,Wei Wei,Huajie Xu,Chuntai Liu,Changyu Shen
Given the advantages of conductive hierarchical chiral nanocomposites for microwave absorption, a templated method was utilized to grow ZIF-67 in situ on helical CNTs (HCNTs). Due to the peculiar helical morphology and size of HCNTs, ZIF-67 exhibited distinctive growth features and pyrolysis features compared to those on planar substrates. In this work, the peculiar morphology was used to separate the nucleation and growth rate on the HCNT surface edges and grooves. Combining the control of solution concentration, reaction time and pyrolysis temperature of ZIF-67, hierarchical helical C/Co@CNT nanocomposites were successfully prepared at a 30 mM Co2+ concentration and a 700 °C pyrolysis temperature. Different from the traditional core–shell structure, this special nanomaterial possessed continuously helical doped carbon belt layers containing embedded Co particles deposited along the HCNT surface edge regions and exhibited a helically conductive path. These growth and pyrolysis mechanisms were explored in detail. With this special structure and composition, the abundant heterogeneous interface, rich defective polarization, good conduction loss, double cross polarization and good magnetic loss synergistically endowed it with an excellent microwave energy dissipation capacity. As a result, C/Co@CNT nanocomposites demonstrated excellent microwave absorption properties. When the thickness is 3.8 mm, the minimum reflection loss is −56.8 dB. The effective absorption bandwidth (RL ≤ −10 dB) is 4.8 GHz with a thickness of 1.6 mm and a filling rate of 25 wt%. We not only prepared an excellent electromagnetic wave absorber with a hierarchical helical structure, but also provided helpful guidelines for designing such a special nanostructure.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 32
·43815-43830
·
IF 4.223
Liu Yaxin,Ma Yongwen,Wan Jinquan,Wang Yan,Sun Jian,Xue Yangyang
In this work, Co-Ce-Zr/γ-Al 2 O3 3 particle electrodes were prepared for the efficient degradation of ciprofloxacin (CIP). Co-Ce-Zr/γ-Al 2 O 3 particle electrodes were analyzed with a scanning electron microscope (SEM), X-Ray Diffraction (XRD), X-Ray Fluorescence Spectrometer (XRF), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDS). According to the results, significant amounts of Co 3 O 4 , CeO 2 , and ZrO 2 were formed on the Co-Ce-Zr/γ-Al 2 O 3 particle electrodes. It was shown that when the conditions of the reaction system were at pH=6, conductivity of 4 ms/cm, current of 0.2 A, initial pollutant concentration of 100 mg/L, and material dosage of 15 g, CIP could be completely degraded within 40 min, and the energy consumed in the reaction was 41.3 kWh/kg CIP. The rate of total organic carbon (TOC) removal by Co-Ce-Zr/γ-Al 2 O 3 particle electrodes was recorded to be approximately 52.6%. Using a response surface methodology, we explored the optimal operating conditions. At the same time, we also explored the influence of inorganic anions in water and actual water medium on the rate of CIP removal. In addition, the ESR data proved that the main active substance in the reaction system was ·OH. The degradation intermediates were investigated, and the possible mechanism was proposed. Thus, this research provided a new solution for the treatment of antibiotic-containing wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Jia-Xin He,Yong-Shan Xiao,Chang Liu,Min-Li Zhu,Yong-Hong Song,Zhong-Wen Liu
MoS 2 is an attractive sulfur-resistant catalyst for directly converting sulfur-containing syngas to high value-added chemicals. However, the effect of the layered structure on the catalytic activity for CO hydrogenation reactions is far from clear. Herein, MoS 2 /carbon composite catalysts with 1–8 stacking layers in MoS 2 crystallites are synthesized, and the impact of the layer numbers on the catalytic performance is probed for the low-temperature methanation of sulfur-containing syngas. The results indicate that the turnover frequency of CO methanation increases from 2.4 × 10 -3 to 3.7 × 10 -3 s −1 with decreasing layer numbers of MoS 2 crystallites from 8.3 to 1.1. This result is thoroughly explained by the fact that the higher ratio of rim sites in MoS 2 crystallites with fewer layer numbers enhances the catalytic activity, which originates from the facilitated activation of CO and H 2 . These understandings are important for the rational design and development of more efficient MoS 2 -based catalysts for CO hydrogenation.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 52
·32988-32995
·
IF 3.361
Yinlei Lin,Shuoqi Wang,Sheng Sun,Yaoheng Liang,Yisheng Xu,Huawen Hu,Jie Luo,Haichen Zhang,Guangji Li
Introducing double physical crosslinking reagents (i.e., a hydrophobic monomer micelle and the LAPONITE® XLG nano-clay) into the copolymerization reaction of hydrophilic monomers of N,N-dimethylacrylamide (DMAA) and acrylamide (AM) is reported here by a thermally induced free-radical polymerization method, resulting in a highly tough and rapid self-healing dual-physical crosslinking poly(DMAA-co-AM) hydrogel. The mechanical and self-healing properties can be finely tuned by varying the weight ratio of nanoclay to DMAA. The tensile strength and elongation at break of the resulting nanocomposite hydrogel can be modulated in the range of 7.5–60 kPa and 1630–3000%, respectively. Notably, such a tough hydrogel also exhibits fast self-healing properties, e.g., its self-healing rate reaches 48% and 80% within 2 and 24 h, respectively.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Jie Xu,Cuili Xiang,Songwen Fang,Luping Zhu,Fen Xu,Lixian Sun,Yongjin Zou,Jian Zhang
Supercapacitors, such as pseudocapacitors (PCs), are widely used because of their excellent electrochemical activity and capacitance; however, it is still challenging to fabricate PCs with high stability and good electrochemical properties. Therefore, suitable templates and transition metal composite materials should be selected for improving their performance. Binary transition metal sulfides exhibit excellent electrochemical performance owing to their rich valence, electrical conductivity, and abundant electrochemical active sites. In this study, we prepared porous Mn-Co-S nanospheres (MCSN) via the hydrothermal method using silica colloidal particles was as the template; to the best of our knowledge, this is the first study to synthesize MCSN. Results suggest that the MCSN composite exhibited excellent conductivity and enhanced stability owing to the porous structure formed by the vertical growth of MnS 2 -CoS 2 nanosheets on silica nanoparticles. The porous MCSN electrode showed an excellent specific capacitance of 1158 F g −1 at 1 A g −1 . Moreover, when coupled with an activated carbon (AC) positive electrode, the supercapacitor of MCSN//AC exhibited stability of 90.4% after 5000 cycles at 10 A g −1 (the specific energy of 34 W h kg −1 at 775 W kg −1 ). Given the results, we believe that the prepared MCSN material has potential application prospects for high-efficiency supercapacitors.
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2021
·Vol. 40
·期 12
·3554-3560
·
IF 4.003
Liu Wen-Wen,Pan Jun,Peng Ren-Fu
The shape-dependent performance of metal co-catalysts in photocatalysis has been one of the research focal points in recent years. In this study, PtPd/C 3 N 4 hybrid structures were constructed to reveal the effect of the shape of the PtPd bimetallic co-catalyst on the performance of photocatalytic hydrogen generation. PtPd nanocubes (NCs) and nanotetrahedrons (NTs) were sequentially deposited in situ on the surface of C 3 N 4 nanosheets, establishing a strong contact interface to ensure the smooth transfer of photoinduced electrons. Ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy and photoelectrochemical experiments revealed that the PtPd NCs/C 3 N 4 photocatalyst had comparable light absorption ability and equivalent carrier separation and transfer efficiency in comparison with the PtPd NTs/C 3 N 4 photocatalyst, which excluded the influence of these factors on shape-dependent performance. The photocatalytic hydrogen generation results indicate that the hydrogen generation rate of the PtPd NCs/C 3 N 4 photocatalyst is 1.33 times higher than that of the PtPd NTs/C 3 N 4 photocatalyst, demonstrating that the cubic PtPd bimetallic co-catalyst is more conducive to hydrogen generation compared to the tetrahedral PtPd bimetallic co-catalyst. Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）