JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Cheng Cheng,Jian Wang,Zhihao Zhao,Changchun Chen,Sheng Cui,Yifeng Wang,Lin Pan,Yaru Ni,Chunhua Lu
Semiconductor catalyst with high photocatalytic activity can be exploited via heterojunction. In this study, a new S-scheme SrTiO 3 /porous ZnO composite was rationally devised, successfully prepared by utilizing a two-step pyrolysis of SrTiO 3 /ZIF-8, and analyzed by various characterization technologies including XRD, SEM, TEM, BET, XPS, PL, UV–vis DRS, and photoelectrochemical and DFT theoretical calculations. A porous structure, tight contact, and a heterojunction formed between SrTiO 3 and porous ZnO (ZnOT) can be observed by SEM and TEM images. BET testing indicates that the SrTiO 3 /porous ZnO composite (S3ZT) shows the highest specific surface area (30.37 m 2 /g). The band gap values (E g ) of SrTiO 3 and ZnOT are around 3.17 and 2.95 eV, which agree with those obtained from DFT calculations. Compared to other samples, the SrTiO 3 /porous ZnO composite (S3ZT) shows higher light absorption and lower transfer resistance as demonstrated by UV–vis DRS and EIS results. S3ZT presents a superior photocatalytic efficiency of 48.8% in degrading 5 mg/L methyl orange (MO) irradiated by 1 h UV–vis light, which are 7- and 1.5-fold higher than pristine SrTiO 3 and ZnOT, respectively. Moreover, based on Mott-Schottky theory, active species trapping experiments, XPS determination, and DFT calculations (energy band gap and work function), it was shown to be reasonable to utilize the S-scheme charge migration process for an explanation regarding the better photocatalytic activity of SrTiO 3 /porous ZnO composite. Overall, this work will provide an effective protocol for devising and preparing semiconductor photocatalysts with S-scheme heterojunction by utilizing the superior characteristics of MOFs.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
Reaction Chemistry & Engineering
·
2022
·Vol. 8
·期 1
·64-76
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IF 5.2
Haosheng Xin,Haiyong Wang,Xiaohong Hu,Xiuzheng Zhuang,Long Yan,Chenguang Wang,Longlong Ma,Qiying Liu
Cellulose hydrolysis and further conversion to diketones and alcohols was performed with graphene layer encapsulated cobalt catalysts (Co@C) in phosphoric acid aqueous solution. A total of 60.5% yield of the products mainly including ethanol, 2,5-hexanedione (2,5-HD) and diols could be achieved in 0.06 M H3PO4 solution. A series of characterization methods such as XRD, XPS, TEM, TG-MS, BET, ICP, H2-TPD, NH3-TPD, and Raman were carried out to explore the catalyst formation mechanism and reaction activity. The results of the analysis indicated that the calcination temperature had a deep influence on the structure formation of the Co@C catalysts, thus leading to differences in the reaction activity. While the calcination temperature was determined at 700 °C, the Co@C catalyst meets with the requirements of optimal reaction activity, appropriate particle size, suitable surface area, and pore size. Besides, it was found that H3PO4 is not only favorable in cellulose hydrolysis but also cooperates with the Co@C catalyst in the hydrogenolysis of C–O bond and C–C bonds for the formation of products. This work provides a possible way for renewable cellulose conversion to diketone and alcohols over encapsulated non-noble metal catalyst combined with phosphoric acid aqueous solution.
研究领域:
化学工程
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催化
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可再生能源
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Tongtong Ye,Xiaotong Wang,Li Wang,Shuna Ren,Lina Yang,Lihua Chen
This study investigates three metal–organic frameworks (MOFs) with distinct Brunauer–Emmett–Teller (BET) surface areas and pore sizes: MOFZr (1274 m2/g, <0.7 nm), MOFAl (371 m2/g, 1.5 nm), and MOFCr (1917 m2/g, 2 nm). Methylene blue (MB, 1.4 × 0.7 × 0.2 nm3) and triferrocene (tri-FC, 1.2 × 0.9 × 0.3 nm3) were adsorbed onto these MOFs. Specific DNA segments targeting SARS-CoV-2 (PR and PO) were employed to block the pores of the MOFs, leading to the formation of DNA-gated MOFs: MOFX/MB/PR and MOFX/tri-FC/PO. These constructs were subsequently integrated with four-arm poly(ethylene glycol) amine (4-arm-PEG-NH2)-modified gold electrodes to create the corresponding sensors (MOFX/MB/PR+MOFX/tri-FC/PO@4-arm-PEG-NH2@Au NPs@GCE). The DNA-gated MOFAl system exhibited the highest loading capacity and a 3-fold increase in sensing efficiency following the introduction of SARS-CoV-2 target DNA, surpassing the performance of the other systems. This study highlights the enhancement of the DNA-gated MOFs when the three-dimensional structures of the guest molecules closely align with the pore sizes of the MOFs. It emphasizes a critical aspect of the traditional design approach for electrochemical sensors based on MOF encapsulation, which often prioritizes BET surface areas while neglecting the compatibility between the sizes of guest molecules and MOF pore diameters. Moreover, the sensor effectively discriminated between SARS-CoV-2 and SARS-CoV by precisely aligning the SARS-CoV-2 target DNA with PR and PO. In contrast, the specific genetic targets (SR) from SARS-CoV showed complete mismatches with PO and a three-base deviation with PR. This differentiation was achieved in a simple one-step assay, even in 5% serum, across a linear concentration range of 10–9 to 10–14 M. This range signifies an expansion of 2 to 3 orders of magnitude compared to sensors that inaccurately selected MOFs.
研究领域:
分析化学
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纳米技术
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生物医学工程
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病毒学
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Xiuxiu Yao,Wendi Huo,Yuchen Wang,Dongfang Xia,Yan Chen,Yuhua Tang,Huayong Tang,Wenjiang Yang,Yu Liu,Jingquan Xue,Qing Yuan,Xueyun Gao,Kai Cao
The presence of low-dose radiation (LDR) in the environment has become more prevalent. However, the effect of LDR exposure on the immune system remains elusive. Here, we interestingly found that LDR specifically elevated the percentage of CD4+IFNγ+ Th1 splenocytes, both in vitro and in vivo, without affecting the percentage of CD8+IFNγ+ Tc1 cells and regulatory T cells. A similar phenomenon was found in T cells from peripheral blood. Mechanistically, we found that LDR can induce mitochondrial damage, which stimulated the STING signaling pathway, leading to the enhanced expression of T-bet, the master transcriptional factor of Th1-cell differentiation. The specific STING signal inhibitor can abrogate the effect of LDR on Th1 differentiation, confirming the central role of the STING pathway. To further validate the immunoregulatory role of LDR, we exposed mice with whole body LDR and evaluated if LDR could protect mice against triple-negative breast cancer through enhanced antitumor immunity. As expected, LDR significantly delayed tumor development and promoted cell death. Meanwhile, LDR resulted in increased tumor-infiltrating Th1 cells, while the proportion of Tc1 and Treg cells remained unchanged. Furthermore, the infiltration of antitumor macrophages was also increased. In summary, we revealed that environmental LDR could specifically regulate Th1 T-cell activities, providing critical information for the potential application of LDR in both clinical and nonclinical settings.
研究领域:
免疫学
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肿瘤学
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放射生物学
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DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2018
·Vol. 296
·期 9
·1533-1544
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IF 1.967
Xu Yiting,Li Jilu,Sun Xiaoqing,He Kaiwei,Li Meng,Shen Tong,Li Yuntong,Li Cong,Yuan Conghui,Zeng Birong,Dai Lizong
In this work, novel mesoporous silica spheres were prepared by calcination of golf-shaped silica microspheres, which were fabricated via a typical sol-gel method by using synthetic amphiphilic block copolymer poly(acrylate isobutyl polyhedral oligomeric silsesquioxane)- b -poly(dimethylaminoethyl methacrylate co-styrene)) (PAPOSS- b -(PDMAEMA- co -PSt) and anionic surfactant sodium dodecyl sulfate (SDS) as dual-template. Firstly, three different POSS-based block copolymers were synthesized through subsequent homopolymerization of acrylate isobutyl POSS and chain extension of dimethylaminoethyl methacrylate (DMAEMA) and styrene with various feed ratios via reversible transfer radical polymerization (RAFT). These amphiphilic block polymers and SDS were utilized as cooperative template to golf-shaped silica microspheres. The electrostatic interaction between protonated PDMAEMA segments and anion surfactant as well as the strong interaction between PAPOSS segments and silicon source plays the dominant role in forming golf-shaped silica spheres. Moreover, the surface morphology of silica spheres can be tuned by varying molar ratio of PDMAEMA/PAPOSS. The resulting golf-shaped silica microspheres were further calcined to give mesoporous silica spheres which exhibited a BET surface area of 1031 m 2 g −1 , a total pore volume of 0.826 cm 3 g −1 , and a narrow pore size distribution centered at 3.20 nm.
研究领域:
材料科学
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化学工程
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纳米技术
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Xiaodi Zhang,Guojie Zhang,Xiaowei Qin,Jun Liu,Guoqiang Li,Ying Xu,Yongkang Lv
A series of nitrogen doped biomass carbon catalysts were prepared through two different nitrogen doped methods by using soybean meal as the raw material, melamine as nitrogen source and KOH as the activators. The catalysts were characterized by BET, SEM , CO 2 -TPD, EA , FTIR , XPS and Raman. The catalytic performances of CH 4 –CO 2 reforming over different samples were also studied. The results show that the preparation method of the catalyst significantly affects the structural characteristics, N content and N species type of the catalyst. The characterization results also show the proportion of pyrrolic-N in the catalyst prepared by in-situ nitrogen doped method (Y-NC) is higher than that in prepared by the post-treatment method (H-NC). Pyrrole-N is more conducive to the adsorption and activation of CO 2 . So, the catalyst prepared by in-situ nitrogen doped method has good catalytic activity and stability. The conversion of CH 4 and CO 2 were respectively 40% and 65% at 900 °C after 50 h of CH 4 –CO 2 reforming reaction .
研究领域:
催化
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材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2023
·
IF 6.7
Xiaoyu Zhang,Xuan Wang,Ying Cao,Chengyang Liang,Shitong Geng,Haipeng Guo,Ying Liu,Yanhong Luo,Wenming Zhang,Ling Li
A porous coating structure transition metal oxide ZnCo 2 O 4 @NiMoO 4 composite was successfully synthesized on the surface of carbon paper (CP) by a simple two-step hydrothermal method as a Pt-free material for titanium mesh substrate counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). According to BET test results, the material has a high specific surface area, which can provide abundant active sites for the redox reaction of electrolytes to enhance the utilization rate of sunlight by DSSCs, and the composite materials show remarkable electrocatalytic performance in reducing iodine electrolytes and improving the photoelectric conversion efficiency (PCE) of DSSCs. Therefore, the DSSCs equipped with ZnCo 2 O 4 @NiMoO 4 /CP material CEs achieve a PCE of 9.30 % (with J sc of 20.51 mA·cm −2 , V oc of 0.763 V, and FF is 0.60), which is much higher than that of Pt CEs (7.36 %) under the same light conditions. This is due to the excellent catalytic ability and good electrical conductivity of the composite material. On the other hand, because the titanium mesh can increase the contact area between the electrode material and the substrate compared with the FTO substrate, and the titanium mesh has good electrical conductivity, it can enhance the diffusion ability of I - / I 3 - to accelerate electron transmission.
研究领域:
材料科学
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电化学
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太阳能
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2023
·Vol. 38
·期 2
·299-303
·
IF 1.6
Fan Hui,Cai Yun,Bai Ping,Yuan Qinwen,Wang Dong,Chen Yuanli
Uniform monodispersed mesoporous silica nanospheres with vertical pores were successfully synthesized using chiral amphiphilic small molecule L-16Ala5PyClO 4 and solvents as dual templates via solgel transcription. The morphologies and pore sizes of silicas are adjustable by changing the type and amount of solvents in the reaction systems. With the increase of the organic solvent content, the morphologies of the obtained silica changed from nanospheres with vertical pore structures to nanosheets structures. When 1 mL of benzene, cyclohexane or toluene were used as solvents, only silica nanospheres were obtained, the BET surface areas of silica nanospheres reached 600.7, 669.5, and 560.8 m 2 /g, respectively. The pore sizes were 3.51, 3.54, and 3.46 nm, respectively. Significantly, these ordered silica nanospheres/poly(vinyl alcohol-co-ethylene) (PVA-co-PE) nanofiber membranes have high separation efficiencies (>99%) for n-hexane/water mixtures.
研究领域:
材料科学
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纳米技术
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环境工程
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2022
·Vol. 48
·期 6
·2557-2573
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IF 3.134
Liu Yueyu,Yin Zhili,Wang Ziqing,Mou Ronglin,Wei Zhong
High surface area ZrO 2 –KOH sample was prepared and used the catalyst for the synthesis of glycerol carbonate (GC) from dimethyl carbonate (DMC) and glycerol. The structure properties of ZrO 2 –KOH were characterized by XRD, BET, CO 2 -TPD, XPS, and ICP-OES. It was found that the strong basicity of ZrO 2 –KOH might be attributed to the oxygen vacancies as well as the big surface area. Experiments were developed to evaluate the effects of catalysis loading, proportion of reactants, temperature and reaction time on the conversion of glycerol to GC. The consequences showed that ZrO 2 –KOH was a highly efficient basic catalyst for synthesis of GC from glycerol. The catalytic performance of ZrO 2 –KOH is much better than that of ZrO 2 –KOH–CP, ZrO 2 –NH 4 OH, and some reported heterogeneous catalysts. And the higher performance of ZrO 2 –KOH was ascribed to the strong basicity. 99.43% conversion was obtained in a particular situation of catalyst/glycerol weight ratio of 3 wt%, DMC/glycerol molar ratio of 3:1, reaction temperature of 80 °C, and reaction time of 2 h. The plausible reaction mechanism for the transesterification on the strong basic active sites was discussed.
研究领域:
催化
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化学工程
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ETHNOPHARMACOLOGY
·
2024
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IF 4.8
Feifan Liu,Yuanmei Bai,Xue Wu,Yan Wan,Shifang Luo,Linao Zhang,Tao Li,Hua Tang,Xianjin Tang,Rong Chen,Qinghua Chen,Yuhuan Xie,Peixin Guo
Ethnopharmacological relevance Allergic rhinitis (AR) stands as a non-infectious inflammatory condition affecting the nasal mucosa, marked by bouts of sneezing, nasal itching, and congestion. This ailment afflicts individuals across all age groups and poses challenges for effective treatment due to its chronic nature. Cangerzisan (CEZS), documented in the Jishengfang compendium, represents a traditional Chinese medicinal formula long utilized for AR management. Aim of the study : Investigating mechanism beneath therapeutic effect of CEZS in alleviating AR. Materials and methods The main active components in CEZS were determined by High Performance Liquid Chromatography (HPLC).The active constituents of CEZS and their corresponding targets were identified through an exhaustive screening process employing TCMSP database. To identify targets relevant to AR, GeneCards, OMIM, and DisGeNET databases were thoroughly applied. Protein-protein interaction (PPI) network was assembled utilizing STRING platform. Potential signaling pathways influenced by CEZS were delineated through GO and KEGG enrichment analyses. Subsequently, an AR model was induced by administering aluminum hydroxide (Al(OH)3) and ovalbumin (OVA) for affecting basal and local sensitization, respectively, facilitating experimental validation of the principal signaling pathways. Results There were 61 active constituents identified within CEZS, targeting a pool of 129 entities associated with AR treatment. Pathways analysis of KEGG revealed that CEZS potentially inhibits AR advancement via modulating TLR4 signaling pathway. Animal experiments demonstrated that CEZS effectively alleviated symptom scores in guinea pigs with AR. Moreover, it exhibited notable improvements in serum immune and inflammatory factors levels, as well as reduced inflammatory infiltration within nasal mucosa, including goblet and mast cells. CEZS was found to enhance GATA-3 expression while reducing T-bet expression, thereby modulating the TH1/TH2 immune balance. Additionally, CEZS downregulated HMGB1, TLR4, and p–NF–κB/NF-κB protein expressions within nasal mucosa of guinea pigs. Conclusions The therapeutic mechanism of CEZS against AR involves rectifying TH1/TH2 immune imbalance and upregulating inflammatory and immune factors through modulating key proteins expression within TLR4 pathway. This targeted regulation effectively impedes AR progression.
研究领域:
民族药理学
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药理学
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免疫学
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传统中药
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生物信息学
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实验验证
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
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2018
·
IF 3.956
Qilei Yang,Ang Cao,Na Kang,Kang An,Zhao-Tie Liu,Yuan Liu
The catalyst for direct ethanol synthesis (DES) from syngas was investigated in this work, which is Co/La 2 O 3 -doped La 4 Ga 2 O 9 . The catalyst was prepared by using LaCo 1−x Ga x O 3 with perovskite phase as the precursor to intensify the interaction in the elements of Co, La and Ga. The catalysts were characterized by using XRD , H 2 -TPR, TEM , EDS, XPS , BET, ICP and TG techniques. This catalyst showed high selectivity to ethanol and excellent stability including excellent resistance to sintering and carbon deposition . It seems that the ethanol is generated in the interface between metallic Co and La 4 Ga 2 O 9 , and in the interface cobalt would be positively charged due to the interaction between Co nanoparticles and La 4 Ga 2 O 9 . The results and the related discussions indicate that Co/La 2 O 3 -doped La 4 Ga 2 O 9 catalyst is a promising catalyst for DES from syngas. Graphical abstracts.
研究领域:
催化
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化学工程
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材料科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 46
·期 2
·857-867
·
IF 3.591
Ziwen Wang,Baichuan Lu,Xiaokun Zhang,Shixiang Lu,Wenguo Xu
Herein, we have prepared a new nanocomposite Bi2S3/Co3O4/rGO/Ni foam substrate electrode through hydrothermal synthesis and an annealing process. SEM clearly shows that the Bi2S3/rGO/Ni foam substrate and Co3O4/rGO/Ni foam substrate prepared under the experimental conditions are cuboid-shaped and flower-shaped, respectively. However, the shape of Bi2S3/Co3O4/rGO/Ni foam is a perfect combination of the above two. We call this cuboid full of petals a flower-rod-like shape. The BET test found that the specific surface area of this unique morphology is as high as 152.7 cm2 g−1, which is beneficial towards charge transfer and improves the overall electrochemical reaction performance of the electrode. In addition, electrochemical performance tests displayed that the Bi2S3/Co3O4/rGO/Ni foam electrode had a high specific capacitance of 2214.3 F g−1 at 1 A g−1. The highest energy density of the Bi2S3/Co3O4/rGO/Ni foam//activated carbon asymmetric supercapacitor is 133.4 W h kg−1 (the corresponding power density is 800.1 W kg−1), and the highest power density is 8568.2 W kg−1 (the corresponding energy density is 70.5 W h kg−1). Additionally, under the condition of 10 A g−1 current density, the capacitance retention rate is still extremely high: 99.4% after 10 000 continuous charge and discharge tests. In practical application, two Bi2S3/Co3O4/rGO/Ni foam//activated carbon asymmetric supercapacitors in series can make a 2.5 V bulb maintain a high brightness for 1 minute.
研究领域:
材料科学
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电化学
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能源存储
✓ 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）