MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
N.R. Khalid,Hamid Ishtiaq,Faisal Ali,M.B. Tahir,Sumaira Naeem,A. Ul-Hamid,M. Ikram,T. Iqbal,M. Rizwan Kamal,Hussein Alrobei,Meshal Alzaid,A. Dahshan
The fast pace of industrial growth during the current decade has seen a large family of dyes employed copiously in the production of various products such as paper and ink. These dyes pollute earth's ecosystems. Researchers look at various ways to degrade these dyes including the use of suitable nanomaterials . ZnO is an important semiconductor material that can be employed for this purpose. In this research work, we optimized the photocatalytic capability of ZnO by co-doping it with 1–7 wt% of Bi and N. The synthesized Bi and N co-doped ZnO nanorod samples showed excellent photocatalytic behavior towards Rhodamine-B (RhB). It was confirmed using XRD and SEM that (5, 2.5) wt.% Bi/N co-doped ZnO nanorods exhibited unique morphology and structure. EDX successfully assessed the elemental composition of the synthesized samples. To provide further insight into its microstructure, the HRTEM and SAED analysis were performed. Optical properties were determined using PL and UV–Visible spectroscopy. The prepared nanorod material degraded almost 89% of RhB in 180 min. The superior degradation ability of co-doped ZnO material when exposed to visible portion of sunlight spectrum is credited to the decrease in the recombination rate of charges and an increase in the depth penetration of photons. The degradation efficiency of Bi/N co-doped ZnO material is enhanced due to reduced recombination rate and increased production of number of defects and oxygen vacancies .
研究领域:
材料科学
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环境科学
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
FlatChem
·
2023
·
IF 6.2
Xia Xu,Changchun Chen,Lingxiu Shu,Cheng Cheng,Zhonghai Tang,Yifeng Wang,Lin Pan,Zishen Guan
Water pollution can be efficiently treated by semiconductor photocatalysts under sunlight irradiation. In this study, novel S-scheme SrTiO 3 /ZnIn 2 S 4 composites were successfully fabricated via a facile oil-bath method. And the synthesized samples were then characterized by various characterization techniques together with Density Functional Theory (DFT) calculation. The X-Ray Diffraction(XRD)patterns show that SrTiO 3 /ZnIn 2 S 4 composites are composed of cubic perovskite structure SrTiO 3 and hexagonal phase ZnIn 2 S 4 . The High Resolution Transmission Electron Microscope(HRTEM)and Field Emission Scanning Electron Microscope (FESEM) images showed the intimate contacts between SrTiO 3 and ZnIn 2 S 4 are established to form the heterojunction. The photocatalytic activity of the composite was excellent when degrading organic pollutants, which outperformed that of pristine SrTiO 3 and ZnIn 2 S 4 . The prepared SrTiO 3 /ZnIn 2 S 4 -33% composite sample was proved to have the best photocatalytic activity, with 98 % degradation of organic pollutants under 32 min. The ·O 2 – is the main active reaction species for the degradation of organic pollutants, which was demonstrated by free radical trapping experiment. In addition, the mineralization of organic pollutants during the degradation process was analyzed by Total Organic Carbon (TOC) test. According to a series of experimental and theoretical calculations, the S-scheme heterojunction formed in the SrTiO 3 /ZnIn 2 S 4 composite is put forward for comprehending the photocatalytic degradation of organic pollutants and the formation of free radicals.
研究领域:
环境科学
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材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Gaopeng Zhou,Ying Li,Yadan Luo,Xi Wang,Yushi Ding
In this article, the structure and electrical properties of BaSn 0.15 Ce 0.35 Hf 0.25 Y 0.1 Yb 0.1 Ho 0.05 O 3-δ (referred as BSCHYYbHo in forthcoming discuss) high-entropy ceramic have been investigated. The BCHYYb (short for BaCe 0.5 Hf 0.3 Y 0.1 Yb 0.1 O 3-δ ) and BSCHYYbHo pellets were synthesized successfully by the solid-state reaction method. The XRD detection results indicate that there is no secondary phase appeared in BSCHYYbHo and the lattice constant decrease compared to BCHYYb. The surface SEM and EDS images illustrates that BSCHYYbHo is denser than BCHYYb and the elements distribution is more uniform. The DFT calculation proves that BSCHYYbHo has a tend to maintain single phase structure. The electrical properties of BSCHYYbHo is obtained by the DRT analysis and equivalent circuit method based on defect equilibria model. The total conductivity of BSCHYYbHo is about 2.02 × 10 -4 ∼1.01 × 10 -2 S·cm -1 and standard molar hydration enthalpy of BSCHYYbHo is recorded as − 81.8 kJ/mol. Further, the proton, oxygen vacancies and electron holes conductivity activation energies in BSCHYYbHo is estimated to be 0.45 eV, 1.41 eV and 1.60 eV, respectively. Compared to BCHYYb, BSCHYYbHo electrolyte has higher proton concentration and proton transference number. Overall, BSCHYYbHo ceramic with dense structure and high proton transference number is a potential material for application.
研究领域:
材料科学
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电化学
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陶瓷
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固体化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaomeng Ma,Jialun Du,Xueli Ji,Lintao Liu,Haitao Wu,Hideo Kimura,YiZhong Lu,Zhenxing Yue
In this work, Nd 2 (Zr 1- x Sn x ) 3 (MoO 4 ) 9 (0.02 ≤ x ≤ 0.1) (NZSM) ceramics were successfully obtained through conventional solid-state route. Phase analysis, microstructure, and properties were investigated scientifically by XRD , SEM, and network analyzer, respectively. XRD results revealed that all samples with different substitution amounts of Sn 4+ formed the pure phase with R-3c space group. The permittivity was related to the polarizability and the bond of Zr2-O5, the bond of Nd-O2 possessed a positive influence on Q×f . The reduced octahedral distortion and increased bond energy made the temperature coefficient more stable. Infrared reflection spectrum results showed that the permittivity was mainly caused by the absorption of phonon oscillation. The optimum properties ( ε r = 10.34, Q×f = 74,795 GHz, τ f = −13.55 ppm/°C) were obtained when x = 0.02 sintered at 750 °C.
研究领域:
材料科学
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陶瓷
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微波介电材料
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固态化学
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 6
·2083-2089
·
IF 1.637
Song Peng,Tu Yu,Shen Xiaoping,Yuan Aihua,Zhai Linzhi,Shah Sayyar Ali
Silk fibroin (SF) derived composites play an important role in regenerative medicine and tissue engineering fields. In this study, through a simple, yet green and sustainable approach, ZIF-8@SF composite was firstly prepared, and its morphological, structural, thermal and mechanical properties were systematically studied. After ZIF-8 feeding, no marked side effect for silkworms was found. The as-prepared composite had 3% of ZIF-8, and a maximum strain of 28%, which was 17% higher than that of the natural SF. Results from SEM, FTIR, XRD and TGA showed that the essential characteristics of SF were well inherited with ZIF-8 addition, suggesting that ZIF-8@SF had a great potential of being used in bio-relevant fields. Noticeably, this study is the first time to develop ZIF-8@SF composite, and the in vivo feeding approach is very promising for commercial production.
研究领域:
材料科学
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再生医学
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组织工程
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xinxin Xiang,Hui Ouyang,Jizhou Li,Zhifeng Fu
Excessive water in herbal medicines (HMs) can cause pests infestation, mildew, and decomposition of active ingredients during storage. The classical detection methods for water content are still unsatisfactory due to the requirement of sophisticated manipulation, long time consumption and usage of large amounts of toxic toluene. Herein, hot injection method was adopted to synthesize humidity-sensitive CsPbBr 3 perovskite, which was used to develop a novel photoluminescent (PL) sensor on a paper substrate for rapid detection of water content in HMs with a turn-off mode. Due to the strong ionic nature of CsPbBr 3 and the high aqueous solubility of CsBr, CsPbBr 3 perovskite is very unstable upon the exposure of water. The signal off can be attributed to the phase change from luminescent CsPbBr 3 to non-luminescent CsPb 2 Br 5 according to the results of XRD pattern analysis of CsPbBr 3 perovskite before and after water exposure. The PL intensity of CsPbBr 3 is linearly related to the water content within the range of 1–17 %. For Seutellaria baicalensis and Astragalus flavone , the detection limits are 0.75 % and 0.67 %, respectively. The results of recovery tests for the two HMs are within the range of 96.7–102.5 %. This work realizes the application of CsPbBr 3 perovskite in the field of pharmaceutical analysis, and shows the application potential for the control of water content in other types of samples sensitive to humidity.
研究领域:
药物分析
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2021
·
IF 6.425
Yang Yin,Jing-Ru Yu,Yu-Cheng Tang,Ai-Zhen Song,Huan Liu,Dong Yang,Jing-Feng Li,Lei Zhao,Bo-Ping Zhang
NaNbO 3 -based ceramics usually show ferroelectric-like P-E loops at room temperature due to the irreversible transformation of the antiferroelectric orthorhombic phase to ferroelectric orthorhombic phase, which is not conducive to energy storage applications. Our previous work found that incorporating CaHfO 3 into NaNbO 3 can stabilize its antiferroelectric phase by reducing the tolerance factor ( t ), as indicated by the appearance of characteristic double P-E loops. Furthermore, a small amount of MnO 2 addition effectively regulate the phase structure and tolerance factor of 0.94NaNbO 3 -0.06CaHfO 3 (0.94NN-0.06CH), which can further improve the stability of antiferroelectricity. The XRD and XPS results reveal that the Mn ions preferentially replace A-sites and then B-sites as increasing MnO 2 . The antiferroelectric orthorhombic phase first increases and then decreases, while the t shows the reversed trend, thus an enhanced antiferroelectricity and the energy storage density W rec of 1.69 J/cm 3 at 240 kV/cm are obtained for 0.94NN-0.06CH-0.5%MnO 2 (in mass fraction). With the increase of Mn content to 1.0 % from 0.5 %, the efficiency increases to 81 % from 45 %, although the energy storage density decreases to 1.31 J/cm 3 due to both increased tolerance factor and non-polar phase.
研究领域:
材料科学
·
陶瓷
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储能
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电陶瓷
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 7
·期 1
·318-326
·
IF 3.289
Pham Van Trinh,Nguyen Ngoc Anh,Bui Hung Thang,Le Dinh Quang,Nguyen Tuan Hong,Nguyen Manh Hong,Phan Hong Khoi,Phan Ngoc Minh,Phan Ngoc Hong
In this study, nanofluid based ethylene glycol (EG) containing Cu nanoparticles decorated on a Gr–MWCNT hybrid material (Gr–MWCNT/Cu) was synthesized successfully for the first time via a chemical reduction method. The SEM, HRTEM, FTIR and XRD studies revealed that Cu nanoparticles with an average diameter of 18 nm were well decorated on the surface of both MWCNTs and graphene sheets. The nanofluids containing Gr–MWCNT/Cu material showed good stability and a maximum thermal conductivity enhancement of 41% at 60 °C for the nanofluid containing 0.035 vol% material compared to EG alone. The enhancement is due to the combination of the high thermal conductivity of graphene, CNT and Cu nanoparticles as well as the higher surface area of the Gr–MWCNT/Cu hybrid structure. Experimental results of thermal conductivity were evaluated using different theoretical models, amongst which the Hamilton–Crosser model was found suitable for predicting the thermal conductivity of the nanofluid.
研究领域:
材料科学
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纳米技术
·
热工程
✓ 已验证
产品关联
DOI
高影响因子
Marine Drugs
·
2022
·Vol. 20
·期 3
·172
·
IF 6.085
Jianping Chen,Xuehua Chen,Jiarui Li,Baozhen Luo,Tugui Fan,Rui Li,Xiaofei Liu,Bingbing Song,Xuejing Jia,Saiyi Zhong
In the present study, a selenium-chondroitin sulfate (SeCS) was synthesized by the sodium selenite (Na2SeO3) and ascorbic acid (Vc) redox reaction using chondroitin sulfate derived from shark cartilage as a template, and characterized by SEM, SEM-EDS, FTIR and XRD. Meanwhile, its stability was investigated at different conditions of pH and temperatures. Besides, its antioxidant activity was further determined by the DPPH and ABTS assays. The results showed the SeCS with the smallest particle size of 131.3 ± 4.4 nm and selenium content of 33.18% was obtained under the optimal condition (CS concentration of 0.1 mg/mL, mass ratio of Na2SeO3to Vc of 1:8, the reaction time of 3 h, and the reaction temperature of 25 °C). SEM image showed the SeCS was an individual and spherical nanostructure and its structure was evidenced by FTIR and XRD. Meanwhile, SeCS remained stable at an alkaline pH and possessed good storage stability at 4 °C for 28 days. The results on scavenging free radical levels showed that SeCS exhibited significantly higher antioxidant activity than SeNPs and CS, indicating that SeCS had a potential antioxidant effect.Keywords:nanoselenium;chondroitin sulfate derived from shark cartilage;structure characterization;antioxidant activity
研究领域:
纳米技术
·
材料科学
·
生物化学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Fuwei Sun,Tianhu Chen,Ziyang Chu,Peixun Zhai,Haibo Liu,Qiang Wang,Xuehua Zou,Dong Chen
A system of Cu 2+ /calcite/PDS was constructed to degrade sulfadiazine (SDZ). Different from the traditional Cu-mediated activation, a low concentration of Cu 2+ that met drinking water standards (≤ 1 mg/L) transformed into Cu(Ⅱ) solid in the presence of calcite, and then enhanced the degradation of SDZ via PDS activation over a pH range from 3 to 9. According to scavenger and chemical probe experiments, Cu(Ⅲ), rather than radicals (hydroxyl radicals and sulfate radicals) and singlet oxygen, was the predominant reactive species, which was responsible for the degradation of SDZ. Based on the results of XRD, ATR-FTIR, and CV curves et al., CuCO 3 was the main complex with high reactivity for PDS activation to form Cu(Ⅲ). Moreover, detailed degradation pathways of sulfadiazine were proposed according to the UPLC-ESI-MS/MS and their toxicity was predicted by ECOSAR. Besides, the real water matrix would not seriously affect the degradation of SDZ in the Cu 2+ /calcite/PDS system. In summary, this study reveals a new insight into the synergistic effect of Cu 2+ and calcite on the SDZ degradation, and promotes an understanding of the environmental benefits of natural calcite.
研究领域:
环境科学
·
化学工程
·
分析化学
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 1
·1-8
·
IF 2.8
Ma Jianli,Zhang Yu,Chen Chen,She Yubin
An efficient reaction sintering process is engaged to synthesize a series of non-stoichiometric Li 2(1+ x ) Mg 3 TiO 6 ( x = 0.01, 0.02, 0.03, 0.04) microwave dielectric ceramics. The single phase of Li 2 Mg 3 TiO 6 with rock-salt structure is accurately recognized by XRD. Pores left on the surface and inside the sample can be clearly observed from SEM pictures. Excessive Li + affects the local charge distribution, which influences the response of the dielectric material to the electric field. The pores are not the same medium as the matrix material, and the signal is refracted and scattered when it passes through the pores. Refractions and scatterings increase the signal transmission distance and also increase the transmission loss. These residual Li + and pores eventually affect the dielectric properties as well. Finally, at x = 0.02 and a sintering temperature of 1260 °C, the ceramic samples showed good dielectric properties: ε r = 10.983, Q×f = 107,367 GHz and τ f = − 24.2 ppm/°C.
研究领域:
材料科学
·
陶瓷材料
·
微波介质
·
固态物理
·
X射线衍射
·
扫描电子显微镜
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Zhuangqing Wang,Xinchao Wang,Chao Zhang,Yinze Yang,Leilei Zhou,Haiyang Cheng,Fengyu Zhao
Catalytic conversion of furfural and its derivatives to value-added C 5 molecules has attractive much attention in the field of biomass conversion . In this paper, the selective hydrogenolysis of tetrahydrofurfuryl alcohol to 1,5-pentanediol has been studied over a series of PrO x promoted Ni/Al 2 O 3 catalysts. The catalytic performances and the promoting effects of PrO x , as well as the role of Ni and PrO x species have been discussed. The surface properties and structure of catalysts were examined by TEM, XRD, XPS, H 2 -TPR, H 2 -TPD, in-situ DRIFTS, etc. The presence of PrO x species promotes the reaction rate and changes product selectivity significantly, and a 79.2% 1,5-pentanediol selectivity can be obtained at 88.4% conversion over the NiPr 1.2 /Al 2 O 3 catalyst. The synergistic effect between defect-rich PrO x and the adjacent active Ni species has been confirmed to contribute to the superior catalytic performances. These results provide useful knowledge for the activation of cyclic ether bonds and the design of heterogeneous catalysts with lanthanide oxide supports.
研究领域:
催化
·
生物质转化
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）