SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Lidan Xie,Wenyi Huang,Guoqiang Jiang,Yi Liu,Mude Zhu,Yi Tang,Xueqin Chen,Xiaoyun Fan
The wide occurrence of metronidazole (MNZ) in aquatic environment has aroused increasing concern to the potential adverse effects on human health. Combining different motifs into a photolytic material to achieve high photocatalytic efficiency is regarded as one of the main strategies during photocatalytic process. Herein, a triple anions contained photocatalyst , Ba 3 (BO 3 )(CO 3 )F (BBCF), exhibited excellent removal efficiency of MNZ (92.6%) in 15 min, which was 5.87 times higher than that of commercial P25. The excellent removal efficiency could be attributed to the strong electronegativity of the F − , and the π-conjugated triangles structure of (BO 3 ) 3− and (CO 3 ) 2− , which made BBCF facilitate the transport of photogenerated electrons, thus accelerating the accumulation of active h + . Meanwhile, the appropriate reduction potential of BBCF accounted for the outstanding productivity of O 2 – . h + and O 2 – were proved as the dominant reactive species for MNZ degradation. The degradation products were analyzed by LC-TOF-MS, and the toxicity of the intermediate was evaluated to be lower than that of parent MNZ molecule. Moreover, BBCF showed the universal application of degrading oxytetracycline (OTC), methylene blue (MB). Therefore, anion-rich BBCF catalyst with high catalytic activity has a potential application prospect for degrading harmful pollutants in practical water environment.
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
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2026
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IF 4.4
Mengchao Feng,Yuchang Wang,Xuewei Lang,Feng Wei,Huayan Si,Jianbin Zhang
This work reports the synthesis of a novel ( α / β- CdS)/Ce(OH)CO 3 composite featuring both heterojunction and heterogeneous junction structures via a simple injection titration-stirring method. The as-prepared composite exhibited excellent visible-light-driven photocatalytic activity for the degradation of high-concentration oxytetracycline (OTC) solution. Under optimal conditions determined by single-factor and response surface analyses, 0.0300 g of the composite achieved a 75.26% degradation efficiency for 50 mL of 160 mg/L OTC solution within 120 min of visible light irradiation. Notably, the composite demonstrated remarkable stability, retaining 62.39% of its initial activity after five cycles, and showed enhanced performance under real sunlight for 120 min, with a degradation rate of 78.50%. The improved photocatalytic performance is attributed to the uniform dispersion of CdS nanoparticles with abundant sulfur vacancies, which increase light absorption and facilitate charge carrier separation. Furthermore, the formation of direct Z -scheme heterojunctions and heterogeneous junctions between CdS and Ce(OH)CO 3 promotes efficient separation and transport of photogenerated carriers, thereby enhancing both photocatalytic activity and material stability.
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DOI
高影响因子
RARE METALS
·
2021
·Vol. 41
·期 1
·166-178
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IF 4.003
Zhang Bo-Lin,Deng Li-Feng,Liu Bo,Luo Chun-Yun,Liebau Michael,Zhang Shen-Gen,Gläser Roger
Abstract Combining the redox properties of Co and the acid properties of Nb in a Co 3 -Nb-O x catalyst is shown to provide superior performance in the selective catalytic reduction of NO with NH 3 (NH 3 -SCR). Co 3 O 4 shows average activity, however, it exhibits a poor N 2 selectivity. Nb 2 O 5 is not active for NH 3 -SCR. However, the mixed Co 3 -Nb-O x catalyst shows higher NO conversion and N 2 selectivity than the single Co 3 O 4 and Nb 2 O 5 catalysts at 100–300 °C. The results of temperature programmed reduction by H 2 and X-ray photoelectron (XP) spectra indicate that the addition of Nb changes the chemical states of Co and decreases the concentration of Co 3+ and O α , adjusting the activity for catalytic oxidation to a moderate level. This suppresses the formation of undesired N 2 O from the over-oxidation of NH 3 . Incorporation of Co and Nb into one solid synergistically couples their redox behavior and surface acidity, ensuring the high catalytic activity and N 2 selectivity in NH 3 -SCR. Graphical Abstract
研究领域:
环境科学
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催化化学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Tianbiao Zeng,Jie Lin,Biao Wang,Binbin Guo,Yihong Ding,Chang Q. Sun
In an era where clean energy and sustainability are prioritized, water electrolysis for hydrogen production has become a focus of research. Ti-6Al-4 V alloy (Ti64) may support the catalyst due to its high mechanical strength, electrical conductivity, and resistance to alkali corrosion. However, its poor catalyst adhesion limits its application. Herein, a carbon layer was deposited on Ti64 (Ti64/C), before depositing the Co0.8Ni0.2(CO3)0.5(OH)·0.11H2O (CNCH) nanoneedles. The porous Ti64-H/C/CNCH electrode performs exceptionally well in the oxygen evolution reaction, achieving a current of 10 mA cm–2 at an overpotential of 131 mV with 90% IR compensation. Furthermore, the cell achieves a density of 10 mA cm–2 at 1.83 V and slow degradation after 45 h of continuous operation under overall water-splitting conditions. This study presents a method of fabricating high-performance water electrolysis electrodes by coating the metal surface with a carbon layer under the catalysts.
研究领域:
材料科学
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能源研究
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Muhammad Saqib,Ali Asghar,Zhangwei Chen,Amal A. Abdel Hafez,Majed Y.A. Almashnowi,Qumail Arshad,Majed Yousef Awaji,Yasir Javad,Mohammed Kuku,Muhammad Shahid Rashid
Transition metal phosphates are gaining attention as an environmentally sustainable and high-theoretical capacity material for electrochemical energy storage devices. This study investigates the impact of adding functionalized graphene Oxide (GO) on the electrochemical sites of cobalt-phosphate (Co 3 (PO 4 ) 2 /GO composite) because of its high surface area and electrical conductivity to open up new possibilities for enhancing the performance of energy storage devices. Herein, nanoflakes like cobalt phosphate and composites with graphene oxide were synthesized using a hydrothermal approach. The crystallinity, morphological effect, and chemical compositional analysis were analyzed via XRD, SEM, and EDS. Then, the electrochemical performance is measured in two different setups, i.e., 2-electrode and 3-electrode cell assembly. In the 3-electrodes setup, the cobalt phosphate/GO composite revealed a high specific capacity of 660 C/g, corresponding to 5 mV/s compared to the individual. In the device performance, cobalt phosphate/GO is utilized as +ev electrode, whereas -ev electrode consists of activated carbon in supercapattery. In their results, the assembled devices produced a specific capacity of 458 C/g with remarkable energy and power density of 82.69 Wh/kg and 433.33 W/kg corresponding to a current density of 0.7 A/g, respectively, with good capacitive retention of 94.77 % after 6 K cycles. Moreover, the theoretical calculation measure from Dunn's model reveals a capacitive contribution increased from 35.51 % to 71.12 % with an increase in scan rates. The study offers a new avenue for advanced energy storage applications.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2026
·
IF 4.4
Si Liu,Zixuan Xu,Qun Liao,Xingxing Zheng,Xionghui Fu,Yuanming Zhang,Yi Zhu
Co₃O₄/TiO₂ achieves a CH₄ yield of 34.8 μmol g −1 h −1 with 82.4% selectivity. • Ti–O–Co bonds serve as charge transfer channels in Co₃O₄/TiO₂. • Co 2+ /Co 3+ redox couples stabilize *CO intermediates and facilitate PCET. • Electron transfer promotes Co electron enrichment for *CO stabilization. • Synergistic electron transfer and proton supply promote selective CO₂ methanation. Value-added conversion of CO 2 using solar energy is a sustainable strategy to address the energy crisis and environmental issues simultaneously. In this work, Co 3 O 4 /TiO 2 composite photocatalysts were successfully prepared by a hydrothermal method. The optimized Co 3 O 4 /TiO 2 achieves a CH 4 yield of 34.8 μmol·g −1 ·h −1 with 82.4% selectivity. The enhanced catalytic activity is ascribed to interfacial Ti-O-Co bonds that facilitate electron transfer toward Co sites, thereby modulating the Co 2+ /Co 3+ electronic environment and creating relatively electron-rich Co sites for *CO stabilization, while the Co 3 O 4 component facilitates the proton-coupled electron transfer (PCET) process toward CH 4 formation. This study provides a practical strategy for promoting the value-added photocatalytic conversion of CO 2 using multivalent transition metal oxide composite photocatalysts. Co 3 O 4 /TiO 2 enables highly selective photoreduction of CO 2 into CH 4 . Ti-O-Co bonds serve as pathways transferring photogenerated electrons from TiO 2 to Co sites. The electron-rich Co centers act as active sites to stabilize *CO intermediates. Meanwhile, Co 3 O 4 promotes water oxidation and maintains sufficient proton supply, synergistically facilitating CH 4 production. Download: Download high-res image (200KB) Download: Download full-size image
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Feng Xie,Jian-Feng Guo,Hai-Tao Wang,Na Chang
As a typical semiconductor, ZnO is considered as a favorable photocatalyst due to its excellent photoelectrochemical properties. However, low response of visible light and the recombination of photoinduced carriers limits its application in photocatalysis . Herein, a novel, robust and recyclable heterogeneous photocatalyst based on flower-like Co doped ZnO microspheres was presented without changing the hierarchical morphology. The crystal structure, light absorption , and electrochemical performance were systematically investigated, and the response of Co doped ZnO to visible light significantly enhanced with the gap band reduced from 3.20 eV to 2.54 eV. Due to the transformation of Co 2+ to Co 3+ , more oxygen vacancies were produced, with more photoinduced electrons transferring to Co 3+ which would greatly inhibit the recombination of photoinduced electrons and holes and improve photocatalytic activity. 2-Mercaptobenzothiazole (MBT) which is considered as a long half-life intermediate of antibiotic medicine is chosen as a target. As a result, the 7% Co-ZnO photocatalyst exhibited excellent photocatalytic activity for the degradation of MBT with the rate constant of 0.1498 min −1 and removing ratio of 97.3% in 50 min. The formation of excess oxygen vacancies and the conversion between Co 2+ to Co 3+ were further identified by XPS analysis . This work provides new sights for doping transition metal with different chemical valence in semiconductors for producing oxygen vacancy and improving the photocatalytic efficiency.
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 HAZARDOUS MATERIALS
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2020
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IF 9.038
Tiantian Chen,Zhenyang Yu,Ting Xu,Rong Xiao,Wenhai Chu,Daqiang Yin
Sulfate radical (SO 4 ·- )-based advanced oxidation processes (AOPs) attract increasing attention in the control of micropollutants. However, SO 4 ·- can react with other chemicals present in water and result in undesired oxidation by-products (OBPs) generation. The formation and degradation mechanisms of CX 3 R-type OBPs during cobalt catalyzed peroxymonosulfate (Co 2+ /PMS) oxidation were investigated. In the formation of CX 3 R-type OBPs, both Co 3+ and SO 4 ·- could convert chloride to free chlorine that then reacted with natural organic matter, leading to the formation of CX 3 R-type OBPs. The concentrations of trichloromethane, chloral hydrate, dichloroacetonitrile, dichloroacetamide and trichloroacetamide after 15 min reaction were 9.8, 3.9, 1.2, 5.9 and 22.3 nM, respectively. Compared to SO 4 ·- , Co 3+ played a more significant role in the CX 3 R-type OBP formation and calculated toxicity values of CX 3 R-type OBPs. CX 3 R-type OBPs could not only be formed but also be degraded at the same time during Co 2+ /PMS oxidation. As for the degradation of CX 3 R-type OBPs, both Co 3+ and SO 4 ·- could transform CX 3 R-type OBPs to chloride. Compared to Co 3+ , SO 4 ·- played a more important role in the degradation of CX 3 R-type OBPs and the conversion from chloride to final by-product chlorate. The adverse effects that results from Co 3+ need more attention in SO 4 ·- -based AOPs application.
研究领域:
环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yinye Chen,Zhen Zhang,Xin Wang,Yidian Lin,Jiachang Zuo,Xuhui Yang,Songhua Chen,Yongjin Luo,Qingrong Qian,Qinghua Chen
In the oxidation reaction of volatile organic compounds catalyzed by metal oxides, distinguishing the role of active metal sites and oxygen mobility at specific preferentially exposed crystal planes and diverse temperatures is challenging. Herein, Co3O4 catalysts with four different preferentially exposed crystal planes [(220), (222), (311), and (422)] and oxygen vacancy formation energies were synthesized and evaluated in styrene complete oxidation. It is demonstrated that the Co3O4 sheet (Co3O4–I) presents the highest C8H8 catalytic oxidation activity (R250 °C = 8.26 μmol g–1 s–1 and WHSV = 120,000 mL h–1 g–1). Density functional theory studies reveal that it is difficult for the (311) and (222) crystal planes to form oxygen vacancies, but the (222) crystal plane is the most favorable for C8H8 adsorption regardless of the presence of oxygen vacancies. The combined analysis of temperature-programmed desorption and temperature-programmed surface reaction of C8H8 proves that Co3O4–I possesses the best C8H8 oxidation ability. It is proposed that specific surface area is vital at low temperature (below 250 °C) because it is related to the amount of surface-adsorbed oxygen species and low-temperature reducibility, while the ratio of surface Co3+/Co2+ plays a decisive role at higher temperature because of facile lattice oxygen mobility. In situ diffuse reflectance infrared Fourier spectroscopy and the 18O2 isotope experiment demonstrate that C8H8 oxidation over Co3O4–I, Co3O4–S, Co3O4–C, and Co3O4–F is mainly dominated by the Mars–van Krevelen mechanism. Furthermore, Co3O4–I shows superior thermal stability (57 h) and water resistance (1, 3, and 5 vol % H2O), which has the potential to be conducted in the actual industrial application.
研究领域:
催化化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Junqin Liu,Pingxiao Wu,Shuaishuai Li,Meiqing Chen,Wentin Cai,Dinghui Zou,Nengwu Zhu,Zhi Dang
A high removal rate (>99.7%) of combined arsenite (As(III)) and Cd (Cd(II)) in low concentration (1000 μg/L) from contaminated water was achieved by a calcined MgZnFe-CO 3 layered double hydroxide (CMZF) adsorbent. Batch control studies and a series of spectroscopy detection technologies were employed to investigate the removal mechanism and interactions between As(III) and Cd(II) on the interface of water/CMZF. Synergistic adsorption and photooxidation occurred based on the systematical kinetic and isotherm studies. The enhanced removal of As(III) was achieved by the photooxidation, formation of ternary As(III) Cd(II) surface complexes and enhanced hydrogen bond . Meanwhile, oxidative formed negative charged As(V) could reduce the electrostatic repulsion force between Cd(II) cations and play a role as anion bridging, consequently resulted in a stronger attraction between CMZF and Cd(II). Combined with the verdicts of relevant characterizations such as XRD, XPS and EPR, it was assumed that the deep co-removal mechanism could be attributed to the coupling of various processes including intercalation, complexation, photooxidation of As(III) and precipitation of CdCO 3 . Moreover, the successful removal of As(III) and Cd(II) from real water matrix qualified the CMZF a potentially attractive adsorbent for both As(III) and Cd(II) deep treatment in practical engineering.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jiahe Zhai,Hui Wang,Abdelkader Labidi,Long Zeng,Yu Huang,Chuanyi Wang
Removing low-concentration NO in the air by means of photocatalytic technology is a promising approach. Herein, our work pins down the mechanism of cobalt metal doping within the lattice of Bi 4 Ti 3 O 12 (BTO) for the photocatalytic NO conversion. As a result, the Co-BTO exhibits a NO conversion efficiency of 58.3 %, which is substantially higher than that of BTO (30 %). More interestingly, the Co-BTO also shows a lower production of intermediate NO 2 than that of the BTO. These findings demonstrate that within Co-BTO, both Co²⁺ and Co³ ⁺ coexist. The redox cycle between these two cobalt species engenders active sites possessing strong reducing capabilities for O₂ which can be adsorbed and activated at the Co sites, thereby generating superoxide radicals (•O₂⁻). Furthermore, the doping of a certain portion of cobalt broadened light absorption and enhanced the separation efficiency of photogenerated carriers, further facilitating the activation of O₂. Lastly, electron spin resonance (ESR) and in-situ diffuse reflective infrared Fourier transform spectroscopy (in-situ DRIFTS) were respectively utilized to further clarify the active species involved in the photocatalytic oxidation of NO and its adsorption and conversion pathways from a mechanistic standpoint. Overall, this work represents a novel endeavor for the advancement of visible-light-driven photocatalysts usage for environmental remediation against NO pollution.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Yanghai Gui,Jintao Wu,Di Zhao,Kuan Tian,Shuaishuai Zhao,Huishi Guo,Xiaoyun Qin,Xiaomei Qin,Dongjie Guo,Yun Wang
H 2 S gas sensors with facile preparation, low detection limits, and high selectivity are crucial for environmental and human health monitoring. However, it is difficult to maintain a high response of H 2 S gas sensors under high humidity in practical applications. To face this dilemma, a layer-by-layer growth method is applied to in situ prepare a nanostructured Co(CO 3 ) 0.5 (OH)·0.11H 2 O/WO 3 coated by a hydrophobic hierarchical ZIF-67 as the H 2 S sensor. This novel composite exhibits excellent humidity immunity without sacrificing the excellent sensitivity and selectivity of H 2 S. At a low operating temperature of 90 °C, a remarkable response value of 1052.3 to 100 ppm H 2 S has been achieved, which is 779 and 9.36 times higher than that of pure WO 3 and Co(CO 3 ) 0.5 (OH)·0.11H 2 O/WO 3 , respectively. More importantly, an 82.2% relative response value remains at a high humidity of 75%RH. The sensing mechanisms are investigated using gas chromatography-mass spectrometry (GC-MS), which revealed that the reaction products are H 2 O and SO 2 . The high humidity immunity and fast response of the Co(CO 3 ) 0.5 (OH)·0.11H 2 O@ZIF-67/WO 3 demonstrate the layer-by-layer in situ synthesis method holds the potential application for the development of high-performance WO 3 -based H 2 S sensors.
研究领域:
材料科学
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环境监测
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传感器技术
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）