CHINESE CHEMICAL LETTERS
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2015
·
IF 1.587
Na Li,Rui Chen,Jing Miao,Peng Zhou,Hai-Bin Yu,Tie-Hong Chen
Hierarchically mesoporous titanosilicate Ti-SBA-1 was synthesized with organic mesomorphous complexes of polyelectrolyte (poly(acrylic acid) (PAA)) and cationic surfactant (hexadecyl pyridinium chloride (CPC)) as template, tetraethylsiloxane as silica source and titanium ethoxide as titanium source. By adjusting the amount of titanium ethoxide in the synthesis, a series of Ti-SBA-1 particles with different Si/Ti ratio (79–180) were prepared. After incorporation of Ti into the silica framework the well-ordered cubic P m 3 ¯ n mesostructure remained, as well as the morphology, particle size. UV–vis DR spectra of the Ti-SBA-1 materials indicated that incorporated titanium species existed in a highly dispersed state and exhibited tetrahedral and octahedral coordination in the silica framework.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ACS Omega
·
2020
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IF 2.87
Jia Yang,Mingyan Fu,Mingdan Tan,Yanling Tian,Xiaorui Sun,Huisheng Huang
Herein, a 3.0%-Au/Sr0.70Ce0.20WO4 sample was prepared for the photocatalytic reduction of the Cr2O72– ion. The photocatalyst was characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible diffuse reflectance spectra. The Sr0.70Ce0.20WO4 sample presented a photocatalytic reduction activity that is better than those of the Ce-doped sample and the intrinsic sample. Thereafter, different metal elements, Cu, Ag, Au, and Pt, were used as cocatalysts, which were loaded on the Sr0.70Ce0.20WO4 sample. The 3.0%-Au/Sr0.70Ce0.20WO4 photocatalyst showed optimal photocatalytic reduction activity in a 8 vol % methanol solution (pH = 7) under visible light irradiation. The kinetic constant of the optimal one is 0.0039 min–1, which is 1.86 times that of the Sr0.70Ce0.20WO4 sample. The photocatalyst is stable enough after a 24 h photocatalytic experiment.
研究领域:
环境科学
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材料科学
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化学
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2022
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IF 9.231
Rui Cheng,Xuejin Mao,Jiaying Yu,Fan Liu,Lan Guo,Dongmei Luo,Yiqun Wan
In view of the molecular structure of Aristolochic acid I (AA-I) and Aristolochic acid II (AA-II), MIL-101(Fe) was selected as the sorbent to develop a dispersive solid-phase extraction (d-SPE) method for capturing the two analytes from Houttuynia cordata. The interactions between the sorbent and analytes were investigated by FT-IR, XPS and UV–Vis DRS spectra. The optimized method demonstrated good linearity with R 2 > 0.9999. The limit of detections (LODs) were 0.007 mg/L and 0.014 mg/L for AA-I and AA-II, respectively, lower than the limit stipulated by Chinese Pharmacopoeia (0.001 %, w/w). The recoveries for AA-I and AA-II were within the range of 73.3–106.4 %. The precisions of intra-day and inter-day were 0.9–5.8 % and 2.1–5.8 %, respectively. Thus, the established method demonstrated to be efficient and reliable to determine AA-I and AA-II in Houttuynia cordata.
研究领域:
分析化学
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药物分析
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材料科学
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DOI
PubMed
高影响因子
Processes
·
2023
·Vol. 11
·期 5
·1398
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IF 3.5
Bohan Ai,Mingsheng Luo,Iltaf Khan
Environmental protection laws require effective and green solutions to tackle water and air pollution issues. For this purpose, perovskite photocatalytic materials have proven to be a promising solution. In this study, CsSnBr3perovskite, coupled with ZIF-67 and decorated with noble metal Au, was shown to effectively enhance the charge separation and increase the light-absorbing capacity, and thus make the photocatalytic reaction more efficient by surface plasmon resonance. Characterization results from XRD, FTIR, and UV-visible diffuse reflectance spectroscopy indicated that a mixture of cubic and tetragonal crystalline phases was found in the prepared catalyst material. XPS also revealed that in the presence of two oxidation states for tin (Sn), the Au 4f XPS peaks of Au NPs coincided with those retained in colloidal Au particles. Using malachite green as a model compound, organic pollutant photocatalytic degradation tests proved that CsSnBr3generated good photocatalytic activity for aromatic pollutant degradation. In this research, the synthesized 4Au-7ZIF-CsSnBr3catalyst yielded an MG degradation rate twice as high as the unpromoted CsPbBr3.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
RSC Advances
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2025
·Vol. 15
·期 38
·31508-31521
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IF 4.6
Donghai Li,Yunrui Xu,Shilin Zhang,Linping Wang
To improve the utilization of solar energy and the efficiency of photocatalytic organic pollutant degradation, novel Z-scheme heterojunctions with high visible light catalytic performances have been widely developed. Herein, a novel Z-scheme BiFeO3/Ag/g-C3N4 heterojunction with a hierarchical 1D/0D/2D structure and visible light absorption was constructed by matching the suitable band structure between 1D BiFeO3 and 2D g-C3N4 and employing the localized surface plasmon resonance (LSPR) effect of 0D Ag nanoparticles. BiFeO3 nanofibers were synthesized via the electrospinning technique, providing short electron transport paths and visible light absorption range for g-C3N4. Plasmonic Ag nanoparticles were photodeposited on the surface of BiFeO3 to enhance the separation efficiency of the photogenerated electron–hole pairs between the bulk interfaces. UV-vis DRS, PL, photocurrent and EIS spectra confirmed the important roles of Ag and BiFeO3 in improving the photocatalytic activity of the Z-scheme heterojunction. The working principle of the BiFeO3/Ag/g-C3N4 Z-scheme heterojunction was proposed, indicating that ˙O2− and ˙OH are the main active species for the photocatalytic degradation of methylene blue (MB). The prepared BiFeO3/Ag/g-C3N4 heterojunction exhibited the highest photocatalytic activity, where its rate constant was 5.84 times higher than that of the pristine BiFeO3 and 3.26 times higher than that of the pristine g-C3N4. This study offers a new means for the design of novel high-performance photocatalysts, which can be a promising candidate in industrial applications.
研究领域:
光催化
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材料科学
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环境科学
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纳米技术
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物理化学
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
·
IF 3.171
Hao Zhou,Qi Yin
The construction of efficient photocatalysts has received much attention in wastewater treatment . In this study, Nb-doped NaTaO 3 was prepared with different doping ratio by a facile hydrothermal method. The prepared catalysts were analyzed by X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller (BET) theory, ultraviolet–visible diffuse reflectance spectroscopy. Then the synthesized catalysts were employed to degrade a model pollutant, methylene blue (MB), under a 250 W mercury lamp. The characterization tests confirm that Nb was successfully doped into the crystal structure of NaTaO 3 and the modified NaNb x Ta 1− x O 3 ( x is the doping ratio; x = 0.25, 0.5, 0.75) samples were formed, which were in regular cubic shapes just like pure NaTaO 3 . The synthesized NaNb x Ta 1− x O 3 ( x = 0.25, 0.5, 0.75) had improved specific surface area and narrowed band gaps compared with pure NaTaO 3 . In photocatalytic degradation experiments, NaNb 0.75 Ta 0.25 O 3 presented the best photocatalytic activity ascribed to the narrow band gap and the high surface area, degradating 95.7% of MB after 180 min of reaction, which was even twice the ability of pure NaTaO 3 . Besides, the effects of possible inorganic anions and cations in wastewater on photocatalytic degradation were investigated. Electron spin resonance (ESR) tests and capture experiments were also conducted and a possible photocatalytic mechanism was proposed. This work provides a direction for constructing superior NaTaO 3 -based photocatalysts to be widely utilized in environmental protection.
研究领域:
环境科学
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材料科学
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化学
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DOI
高影响因子
Nanoscale
·
2025
·
IF 5.1
Xiangmei Wang,Huimin Zhang,Hubing Li,Zhiling Qiu,Xin Xiao
In light of the escalating severity of water pollution, the development of innovative and efficient photocatalytic materials has emerged as an urgent requirement. In this study, P-doped ultrathin g-C3N4 was successfully synthesized using the chemical vapor deposition technique, specifically to enhance the photocatalytic degradation of the antibiotic tetracycline hydrochloride (TC) and the dye rhodamine B (RhB). The purpose of P doping was to modify the electronic structure of g-C3N4 and increase its photocatalytic efficiency. The microstructure, chemical state, and light absorption properties of the material were extensively analyzed using advanced characterization techniques such as high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The study revealed that P doping not only enhanced the structural stability of the nanosheets but also effectively broadened the material's light-responsive range by creating new band structures. Photocatalytic tests showed that under visible light irradiation, P-doped ultrathin g-C3N4 demonstrated outstanding degradation efficiency against TC and RhB. Specifically, the doped catalyst reduced the concentrations of TC and RhB by more than 90% within 60 minutes, markedly surpassing the performance of undoped graphitic carbon nitride nanosheets. Moreover, the phosphorus-doped materials retained high catalytic activity and stability after repeated usage cycles. From a theoretical perspective, this research applied density functional theory (DFT) based on first principles to deeply investigate the electronic properties of P-doped ultrathin g-C3N4. The calculations disclosed that phosphorus doping led to modifications in the band structure, particularly an increase in localized states at the valence band top, which is vital for facilitating the effective separation of photogenerated electron–hole pairs. Additionally, the doping significantly altered the charge distribution on the material's surface, enhancing the catalyst's capacity to adsorb and activate molecules of TC and RhB. Overall, this research not only provided an efficient photocatalytic material for addressing persistent pollutants in aquatic environments but also explored the fundamental mechanisms by which P doping improves the photocatalytic performance of g-C3N4, thereby offering theoretical and experimental bases for the design of novel photocatalysts.
研究领域:
环境科学
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材料科学
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化学工程
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纳米技术
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物理化学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 19
·1-17
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IF 2.8
Sandhiya M.,Bincy F. Irine Maria,Oviya S.,Prakash V. Collins Arun,Kumar Raju Suresh,Kim Ikhyum,Dhas S. A. Martin Britto
Fluorescein (C 20 H 12 O 5 ) is a synthetic dye known for its excellent optical and fluorescence properties; it is used as a gain medium in lasers. While fluorescein has garnered interest for use in dye-sensitized solar cells, its narrow absorption spectrum in the visible range limits its effectiveness. To enhance the energy conversion, broader absorption spectra of the materials are desirable. Also, understanding how an organic dye performs under harsh environmental conditions is essential for enhancing its performance. We demonstrate that the absorption spectrum of fluorescein dye can be broadened and its optical properties enhanced by using an acoustic shock wave generated with a semi-automated Reddy tube, operating at Mach number of 1.5, a transient pressure of 590 kPa, and a transient temperature of 520 K. To assess structural and optical properties of fluorescein before and after shock waves, we used powder XRD, Raman spectroscopy, UV-DRS, fluorescence spectroscopy, and FESEM. The crystalline structure and average crystallite size were determined from the XRD pattern; after shock loading, no structural changes were found. The absorption spectra showed a significantly enhanced absorption range in the visible region without altering the structure.
研究领域:
光学材料
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应用物理
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可再生能源
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材料科学
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光谱学
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冲击波处理
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产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2018
·Vol. 20
·期 3
·1-15
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IF 2.127
Feng Jun,Bao Wenyuan,Li Lijun,Cheng Hao,Huang Wenyi,Kong Hongxing,Li Yanqing
We synthesized titanium dioxide (TiO 2 ) and nitrogen-doped TiO 2 nanoparticles (N-TiO 2 NPs) via a sol-hydrothermal method using ammonium chloride (NH 4 Cl) as the nitrogen (N) source. Furthermore, an N-TiO 2 /4-mercaptobenzoic acid (4-MBA)/silver (Ag) nanocomplex served as an active substrate for surface-enhanced Raman scattering (SERS) and was prepared by self-assembly. During SERS, the Raman signals of 4-MBA of the N-TiO 2 /MBA/Ag nanocomplexes exhibited higher intensity and sensitivity than pure TiO 2 /MBA/Ag, with 1% N doping in N-TiO 2 , producing the strongest Raman signals. We characterized the N-TiO 2 hybrid materials by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and ultraviolet-visible diffuse reflectance spectra. N doping did not influence the phase of the TiO 2 crystal. The doped N entered into the crystal lattice of the TiO 2 , replacing some oxygen (O) to form Ti-O-N or Ti-N-O linkage. The results indicated that an appropriate amount of N doping could enhance the SERS performance of the TiO 2 SERS substrate via N substitution doping. These doping forms were beneficial to the molecular charge transfer (CT), and this resulted in improved SERS performance for N-doped TiO 2 NPs. We attributed this improvement to the formation of N-doping energy levels that were beneficial to the process of TiO 2 to MBA molecule CT. This work not only enriched the nonmetal-doped CT mechanism in SERS but also provided several reference values for practical applications.
N-doped TiO 2 nanoparticles were synthesized. Whereafter, N-TiO 2 /MBA/Ag nanocomplexes were prepared and served as a SERS-active substrate. An appropriate amount of N doping can enhance the SERS properties of TiO 2 SERS-active substrate by nitrogen substitution doping. The nonmetal doping TiO 2 -to-molecule CT mechanism and the synergistic effect in N-TiO 2 /MBA/Ag charge transfer systems have been studied.
研究领域:
材料科学
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纳米技术
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分析化学
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光学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Yinghua Li,Wenyue Yin,Mengxi Li,Jingwen Zhang,Lijun Chen
Ag/AgCl/Bi 2 O 3 /BiFeO 3 composite photocatalysts were synthesized by a simple co-precipitation and sono-chemical method, and their photocatalytic properties were investigated. The crystal structure, morphology, and elemental composition of the Ag/AgCl/Bi 2 O 3 /BiFeO 3 composite photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy-energy spectroscopy (SEM-EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS). Carrier migration and separation studied by Uv–vis DRS and PL spectroscopy. XPS showed that Ag monomers were successfully reduced out. The photocatalytic activity of the composites was investigated by simulating sunlight (full-spectrum xenon lamp irradiation) irradiation of levofloxacin hydrochloride. The results showed that the composite photocatalyst had the highest photocatalytic activity at pH 8 of the prepared system, pH 7 of the reaction solution and Ag + concentration of 0.1 mol/L (44.3 wt% loading), and still had good photocatalytic activity after five cycles. Compared with Bi 2 O 3 /BiFeO 3 and Ag/AgCl, Ag/AgCl/Bi 2 O 3 /BiFeO 3 exhibited better photocatalytic activity. In addition, based on the radical scavenging experiments and electron spin resonance analysis, ·O 2 - , h + and ∙OH were the reactive groups that played a role in the reaction system, and a possible catalytic mechanism of Ag/AgCl/Bi 2 O 3 /BiFeO 3 was proposed.
研究领域:
材料科学
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环境化学
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光化学
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催化
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产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 2
·192
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IF 2.9
Danye Zuo,Yuhong Yin,Liming Jiang,Zhi Xia,Chong Tan,Junsheng Li,Jinlong Zuo,Yuyang Wang
This study focuses on synthesizing a composite material of Ag/ZnO/BiOCl using Ag, ZnO, and BiOCl as raw materials. The material was prepared by loading Ag and BiOCl onto ZnO nanofilms, aiming to enhance the photocatalytic degradation of ciprofloxacin (CIP). Optimization of the photocatalytic degradation process through single-factor experiments revealed that under conditions of an initial CIP pH of 9, an Ag/ZnO/BiOCl dosage of 1 g/L, and an initial CIP concentration of 5 mg/L the conversion efficiency of CIP reached 98.79% after 150 min of exposure to a 250 W xenon lamp simulating sunlight. Furthermore, the composite material maintained a conversion efficiency of 86.17% for CIP even after five cycles of reuse, demonstrating its excellent stability. The optical properties, elemental composition, valence state, crystallinity, and morphology of the samples were analyzed using techniques such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), UV–visible diffuse reflectance spectroscopy (UV-vis DRS), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The results indicate that the introduction of Ag expanded the light response range of ZnO, while the addition of BiOCl improved the separation efficiency of electron–hole pairs in the composite nanomaterial. The photocatalytic mechanism was further elucidated through radical scavenging experiments, confirming that ·OH and h+are the main active species in the degradation process.
研究领域:
材料科学
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环境工程
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光化学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 80
·64976-64982
·
IF 3.84
Shuaishuai Ma,Jinjuan Xue,Yuming Zhou,Zewu Zhang,Zhilan Cai,Daibao Zhu,Shuang Liang
A facile hard template approach has been developed to prepare mpg-C3N4/TiO2 composites using SiO2 nanoparticles as a hard template and cyanamide as a precursor. The samples have been well characterized using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The results demonstrate that TiO2 nanoparticles sized 5–10 nm were distributed on the surface of mpg-C3N4 to form the mpg-C3N4/TiO2 heterojunction photocatalyst. In this way, the mpg-C3N4/TiO2 heterojunction catalyst has a porous structure and large surface area, which increases the contact area for pollutants. Rhodamine B (RhB) was used as a representative organic pollutant to evaluate the photocatalytic activity of the samples under visible light irradiation. The results show that the as-prepared mpg-C3N4/TiO2 heterojunction catalyst has a significantly enhanced visible light photocatalytic activity compared to pure mpg-C3N4 and that the degradation rate was 1.6 times higher than that of pure mpg-C3N4. The increased photocatalytic activity of the mpg-C3N4/TiO2 heterojunction catalyst can be attributed to the formation of the heterojunction between mpg-C3N4 and TiO2, which suppresses the recombination of photoinduced electron–hole pairs. Furthermore, based on systematic characterization and discussion, a possible photocatalytic mechanism for the excellent photocatalytic performance was proposed.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）