CERAMICS INTERNATIONAL
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2025
·
IF 5.6
Kaihui Hua,Zhijing Wu,Weijie Chen,Yu Zheng,Xiuan Xi
Despite extensive research on TiO 2 -based photocatalysts, their poor visible-light response and low charge-separation efficiency still limit practical applications in wastewater treatment. While previous studies have explored individual strategies such as metal doping or defect engineering, few have systematically investigated their synergistic effects in TiO 2 porous ceramics. This study addresses these challenges by developing a dual-modification strategy combining ZnO doping and NaBH 4 reduction to enhance the photocatalytic performance of TiO 2 porous ceramics. ZnO doping promotes anatase phase stability and inhibits the anatase-to-rutile transition, while NaBH 4 reduction introduces abundant oxygen vacancies and Ti 3+ species, narrowing the band gap and extending light absorption into the visible range. As a result, the optimized ceramics achieve a methylene blue degradation efficiency of 90.07%, outperforming undoped (79.32%) and singly ZnO-doped (86.01%) counterparts. This synergistic enhancement is attributed to the tailored surface chemistry and electronic structure, verified through structural and optical characterizations. Compared with previous TiO 2 porous ceramic studies, this work provides a scalable and effective modification strategy, offering new insights for designing high-efficiency, recyclable photocatalysts for environmental remediation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 3
·619
·
IF 3.9
Chen Yang,Xuefeng Hu,Yaxing Bai,Beichuan Cai,Yujie Li
In this study, a simple and low-energy synthesis scheme of Fe single-atom anchored carbon nitride was reported to improve the photocatalytic performance of g-C3N4. Synthesized Fe single-atom doped graphite carbon nitride (Fe-SACs/g-C3N4) showed high activity and stability for the degradation of 2-mercaptobenzothiazole (MBT); under visible light irradiation, 99% of MBT could be degraded within 35 min, and the degradation ability basically did not decline after five cycles, mainly due to the synergistic effect of the Fe single atoms and carbon nitride. The results of X-ray absorption fine structure (EXAFS), X-ray photoelectron spectroscopy (XPS), and density functional theory calculations show that the single-atom Fe forms Fe-N4coordination with pyridine nitrogen to generate a new electron transfer channel, which can significantly improve the in-plane separation and transfer of carriers, finally enhancing the generation of superoxide radicals. This is confirmed by time-resolved photoluminescence, photoelectron chemistry, and electron spin resonance measurements. The main intermediates of MBT degradation were determined using a liquid chromatograph–mass spectrometer (LC-MS), and a possible photocatalytic mechanism based on the quenching experiment and electron paramagnetic resonance (EPR) test was proposed. A deep understanding of the contribution of Fe single-atom sites with clear local coordination structures will help to design effective catalysts for photocatalytic performance.Keywords:graphitic carbon nitride;single-atom;NaBH4reduction;photocatalytic degradation
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2024
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IF 3.2
Shuang Hou,Min Ma,Chun Wang,Peifang Wang,Zhe Ji,Shufang Tian,Mingxue Li
The generation of oxygen vacancies assumes a pivotal role in the photocatalytic degradation of antibiotics. Surface oxygen vacancies serve as deterrents to the recombination of photogenerated carriers, thereby augmenting photocatalytic efficiency. In this work, the NaBH 4 reduction technique was adopted to introduce oxygen vacancies onto the surface of Ta 2 O 5-x , thus enhancing its photocatalytic powers. Remarkably, the photocatalytic activity of the modified Ta 2 O 5-x -0.5 M samples exhibited significant improvement upon treatment with NaBH 4 solution at varied concentrations. Characterization of the modified Ta 2 O 5-x samples was conducted using a suite of techniques including XRD, FT-IR, UV–vis DRS, ESR, XPS, and EPR. Notably, the EPR spectrum provided compelling evidence of the presence of oxygen vacancies, affirming their existence on the surface of the modified Ta 2 O 5-x samples. To further corroborate the formation of oxygen vacancies, tetracycline (TC) solution was employed as a simulated pollutant, revealing a marked enhancement in visible light catalytic activity through experimental observations. The findings elucidate that the defect sites engendered by oxygen vacancies primarily enhance the efficiency of electron-hole pair separation and facilitate greater absorption of visible light, thereby amplifying photocatalytic activity. The modification of Ta 2 O 5-x samples by NaBH 4 reduction predominantly facilitates the introduction of oxygen vacancies on the surface, consequently bolstering photocatalytic performance. This exemplifies a noteworthy approach for significantly enhancing the photocatalytic activity of Ta 2 O 5-x , providing valuable insights for future design strategies.
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
MOLECULES
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2013
·Vol. 18
·期 10
·12609-12620
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IF 2.428
Chao Lin,Kai Tao,Dayin Hua,Zhen Ma,Shenghu Zhou
Gold nanoparticles (Au NPs) were prepared by reducing HAuCl4with NaBH4. Their average particle sizes could be tuned in the range of 1.7 and 8.2 nm, by adjusting the amount of NaBH4used during synthesis. The obtained Au NPs (colloids) were then loaded onto a commercial Al2O3support to prepare Au/Al2O3catalysts with tunable Au particle sizes. An optimal pH value (5.9) of the Au colloid solution was found to be essential for loading Au NPs onto Al2O3while avoiding the growth of Au NPs. Au NPs and Au/Al2O3catalysts were tested in the reduction ofp-nitrophenol with NaBH4. Interestingly, the catalytic activity depended on the size of Au NPs, being the highest when the average size was 3.4 nm. Relevant characterization by UV-Vis, TEM, and XRD was conducted.
研究领域:
化学
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材料科学
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催化
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DOI
高影响因子
Catalysts
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2019
·Vol. 9
·期 10
·795
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IF 3.444
Yuxiang Yan,Hua Yang,Zao Yi,Tao Xian
In this work, we have synthesized BiOCl nanoplates (diameter 140–220 nm, thickness 60–70 nm) via a co-precipitation method, and then created Bi nanoparticles (diameter 35–50 nm) on the surface of BiOCl nanoplates via a NaBH4reduction method. By varying the NaBH4concentration and reaction time, the evolution of Bi nanoparticles was systematically investigated. It is demonstrated that with increasing the NaBH4concentration (at a fixing reaction time of 30 min), BiOCl crystals are gradually reduced into Bi nanoparticles, and pure Bi nanoparticles are formed at 120 mM NaBH4solution treatment. At low-concentration NaBH4solutions (e.g., 10 and 30 mM), with increasing the reaction time, BiOCl crystals are partially reduced into Bi nanoparticles, and then the Bi nanoparticles return to form BiOCl crystals. At high-concentration NaBH4solutions (e.g., 120 mM), BiOCl crystals are reduced to Bi nanoparticles completely with a short reaction time, and further prolong the treatment time leads to the transformation of the Bi nanoparticles into a two-phase mixture of BiOCl and Bi2O3nanowires. The photodegradation performances of the samples were investigated by choosing rhodamine B (RhB) as the model pollutant and using simulated sunlight as the light source. It is demonstrated that an enhanced photodegradation performance can be achieved for the created Bi@BiOCl hybrid composites with appropriate NaBH4treatment. The underlying photocatalytic mechanism was systematically investigated and discussed.Keywords:BiOCl nanoplates;Bi nanoparticles;NaBH4reduction;Bi@BiOCl hybrids;photodegradation performance
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
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2020
·Vol. 37
·期 1
·64-77
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IF 1.681
Yuxiang Yan,Hua Yang,Zao Yi,Xiangxian Wang,Ruishan Li,Tao Xian
In this work, we have adopted a coprecipitation method to synthesize BiOBr nanoplates with diameter of 150–450 nm and thickness of 40–80 nm, and then created Bi nanowires (diameter: 6 nm) on their surface through a NaBH4 reduction method. Evolution of Bi nanowires was systematically investigated by varying the concentration of NaBH4 solution and reaction time. It is demonstrated that with increasing the NaBH4 concentration (2 h reaction), Bi nanowires are gradually evolved from BiOBr crystals, and in particular treatment by 110 mM NaBH4 solution leads to the complete evolution of BiOBr nanoplates to Bi nanowires. At a low-concentration NaBH4 solution (30 mM), BiOBr crystals are partially reduced to Bi nanowires with increasing reaction time, and then the Bi nanowires are recrystallized into BiOBr nanowires/nanoparticles on the surface of BiOBr nanoplates. At a high-concentration NaBH4 solution (110 mM), BiOBr nanoplates are easily reduced to Bi nanowires with a short reaction time, and further prolonging the reaction time leads to the gradual transformation of Bi nanowires into Bi4O5Br2 nanoparticles/nanowires. Photocatalytic performances of the samples were evaluated by eliminating rhodamine B from aqueous solution under simulated sunlight illumination. It is demonstrated that the creation of Bi nanowires (an appropriate content) on the surface of BiOBr nanoplates can produce excellent Bi@BiOBr composite photocatalysts with enhanced photodegradation performances. The underlying enhanced photocatalytic mechanism was investigated and discussed.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2014
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IF 4.086
Zhenhua Yan,Min Wang,Jifeng Liu,Renmin Liu,Jinsheng Zhao
Insufficient catalytic activity and durability are the most challenging issues in the commercial deployment of low-temperature fuel cells. In an effort to address these barriers, three carbon-supported Pt x Fe alloy electrocatalysts with varying Pt:Fe atom ratios (Pt 3 -Fe/C, Pt 2 -Fe/C, Pt-Fe/C) were prepared by simple NaBH 4 reduction in glycerol at room temperature. All of the prepared Pt x Fe nanoparticles (NPs) are highly dispersed on a carbon support and show a single-phase face-centered cubic structure with a particle size of approximately 2 nm. The electrocatalytic performances of the synthesized Pt x Fe alloy catalysts were compared with that of commercial Pt/C by cyclic voltammetry and linear sweep voltammetry; among these NPs, the Pt 3 -Fe/C catalyst exhibits the highest activity and the best stability for oxygen reduction reaction (ORR) in both acidic and neutral media. As the cathode catalyst, the maximum power density produced from microbial fuel cell with Pt 3 -Fe/C (1680 ± 15 mW m −2 ) was 18% higher than that with conventional Pt/C (1422 ± 18 mW m −2 ), and the stability of Pt 3 -Fe/C was greatly improved.
研究领域:
材料科学
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电化学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2013
·Vol. 18
·期 4
·1087-1097
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IF 2.279
Yan Zhenhua,Wang Min,Lu Youqin,Liu Renmin,Zhao Jinsheng
Three carbon-supported Pt–Co alloys with varying Pt to Co atom ratio (Pt 2 –Co/C, Pt–Co/C, Pt–Co 2 /C) were prepared by NaBH 4 reduction in ethylene glycol at room temperature. As supported by X-ray diffraction, all the prepared Pt–Co nanoparticles have a single-phase face-centered cubic structure. Transmission electron microscopy indicates that all nanoparticles have small particle-size range and are highly dispersed on carbon support. Catalytic properties of the synthesized Pt–Co alloy catalysts were analyzed using cyclic voltammetry and linear sweep voltammetry methods, and the results suggested that Pt–Co/C catalysts exhibit the best Pt mass activity and the highest stability for the oxygen reduction reaction (ORR) when compared with Pt/C catalyst and other Pt–Co alloy catalyst in both acidic and neutral media. Kinetic analysis reveals that the ORR on Pt–Co alloy follows the four-electron pathway leading to water. As the cathode catalyst, the single-chamber microbial fuel cell tests indicated the much better performance of Pt–Co alloy than that of commercial Pt/C.
研究领域:
电化学
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材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2017
·Vol. 53
·期 2
·1568-1579
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IF 2.599
Liang Miao,Zhang Guo,Feng Yajie,Li Ruili,Hou Pei,Zhang Junsong,Wang Jianmin
Facile and robust immobilization of metal nanoparticles onto porous supporting matrix is an important issue in heterogeneous catalysis. This study reports a facile procedure for the synthesis and immobilization of small catalytic active silver nanoparticles (AgNPs) on cellulose paper (CP), which possesses interconnected fibrous structure and can be employed as cost-effective supports. Amino groups were first introduced to CP, through a silane coupling technique, to provide stable anchoring centers for silver ions. Small-sized AgNPs without aggregation were facilely synthesized and stably immobilized onto the fiber surface of CP followed by NaBH 4 reduction. The as-prepared AgNPs incorporating composites exhibited excellent catalytic activity for the reduction of 4-nitrophenol. The rate constant of the catalytic reaction was calculated to be 1.46 × 10 −2 s −1 . More importantly, these amino-modified paper-based composite catalysts can be easily recovered and reused for at least six cycles due to their enhanced mechanical and catalytic stability.
研究领域:
材料科学
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催化
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纳米技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junfeng Yang,Jinsong Lu,Liangsheng Xie,Jingfeng Wu,Yu Wen,Qin Zhang
Herein, the SrTiO 3 -TiO 2 -CaTiO 3 /Cu 2 O quaternary composite has been designed and prepared via one-step hydrothermal process followed by a NaBH 4 reduction treatment. By comparing the H 2 production rate (HPR) of Sr-Ti-Ca/Cu samples prepared by different Cu sources, it is found that Sr-Ti-Ca/Cu has the best H 2 production performance when CuCl 2 is as Cu source. As expected, the highest HPR of Sr-Ti-Ca/Cu sample is up to 5.088 mmol g −1 h −1 , which is 195.7 times as higher as that of the Sr-Ti-Ca sample (0.026 mmol g −1 h −1 ) under the same conditions. Moreover, the HPR reached 0.692, 0.530 and 0.647 mmol g −1 h −1 in tap water, lake water and river water, indicating that the photocatalyst has high practicability in natural water sources. In addition, the experiment of the tap water composition effect on H 2 production performance shows that NO 3 − and SO 4 2− ions have great negative influence on the HPR. Compared with Sr-Ti-Ca, the light absorption of Sr-Ti-Ca/Cu extends over the entire visible region, the interface resistance decreases, and the photocurrent density increases. These results suggest that the well-designed dual p-n heterojunctions and dual type-II heterojunctions in Sr-Ti-Ca/Cu sample can enhance the light absorption in the ultraviolet region and realize the rapid separation and migration of photogenerated charge, thereby accelerating the production of H 2 . This work shows the strong advantage and potential of non-precious metal efficient photocatalyst system for producing H 2 from deionized water and natural fresh water.
研究领域:
材料科学
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化学
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环境科学
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能源
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Menglin Li,Xinpeng Wang,Jian Zhang,Yonghao Gao,Wen Zhang
The capture of toxic radioiodine is an increasingly important priority for the safe development of nuclear energy. Copper is a promising alternative for expensive silver to capture iodine. To develop novel copper-based adsorbents and determine the effect of copper species on iodine adsorption, the metal–organic framework with dual-pyrazole ligands (MOF-303) is employed as the scaffold to bind Cu 2+ species. Cu 0 nanoparticles were formed after the reduction by NaBH 4 . The obtained Cu 2+ -MOF-303 and Cu 0 -MOF-303 show high iodine uptake capacities at 353 K, 747 mg·g −1 and 837 mg·g −1 , respectively. They also show high iodine uptake capacities of more than 300 mg·g −1 at a high temperature (423 K), which are better than other Cu-based adsorbents. Besides, the loading of Cu can enhance the iodine selectivity under humid vapor, and iodine adsorption rate in iodine-cyclohexane solutions. The Cu 0 on Cu 0 -MOF-303 can react with iodine directly via the redox mechanism. For Cu 2+ -MOF-303, the adjacent pyrazole ligands can chelate with Cu 2+ ions strongly and transfer charges to trapped iodine to form polyiodide anions, and thus stable CuI species could also be generated. The strategy of anchoring Cu species using MOF-303 provides large channels for iodine diffusion, and highly-dispersed Cu and N sites for iodine capture.
研究领域:
核能
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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
危险品化学品经营许可证（带存储）