AUSTRALIAN JOURNAL OF CHEMISTRY
·
2016
·Vol. 70
·期 3
·271-279
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IF 1.427
Pengfei Xing,Rongxiang Zhao,Xiuping Li,Xiaohan Gao
The ultra-deep desulfurization of fuel oil has become inevitable for environmental protection. Here, CoWO4/g-C3N4 was used as a catalyst, H2O2 as an oxidant, and 1-ethyl-3-methylimidazolium ethylsulfate ([EMIM][EtSO4], IL) as an extractant for the oxidative desulfurization of model oil. Scanning electron microscopy, FT-IR spectroscopy, N2 adsorption isotherms, and X-ray diffraction were used to confirm the morphology, structure, and properties of the catalysts. The influence of calcination temperature, loading dose of cobalt, amount of H2O2, reaction temperature, and other parameters were investigated. The removal rate of sulfide in model oil could reach 92.9 % at 80°C in 180 min under the optimal operation conditions (V(oil) = 5 mL, T = 80°C, m(catalyst) = 0.03 g, V(H2O2) = 0.4 mL, t = 180 min, V(IL) = 1.0 mL). In addition, the catalyst was reused five times with no significant reduction in the catalytic activity.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 8
·e202405010
·
IF 2
Yujun Liu,Meng Lan,Xiaoli Dong,Nan Zheng,Jialin Gou
Graphical A novel type II CoWO 4 /Cd 0.5 Zn 0.5 S heterostructure photocatalyst is constructed by a simple secondary hydrothermal method and applied for the efficient photodegradation of rhodamine B (RhB) and methyl orange (MO) under visible light irradiation. The expansion of visible light absorption and dense interfacial contact contributes to the excellent photodegradation activity toward RhB and MO. The ecosystems and human health have been gravely impacted by growing organic pollutants and photocatalysis and is regarded as one of the most valid and green governance approaches. Herein, a novel type II CoWO 4 /Cd 0.5 Zn 0.5 S (CWO/CZS) heterojunction photocatalyst was constructed by a secondary hydrothermal method and applied to the photodegradation of rhodamine B (RhB) and methyl orange (MO). The experimental results show that the CWO/CZS heterojunction photocatalyst exhibits excellent photodegradation activity toward RhB and MO under visible light irradiation. CWO/CZS (0.10:1) achieved a degradation efficiency of 96.7% for RhB within 15 min and the apparent rate constants were 135 and 5 times of CWO and CZS, respectively. The high photodegradation rate of MO also demonstrates its excellent photocatalytic activity. The significant improvement in the photocatalytic degradation rate originated from the expansion of visible light absorption and dense interfacial contact between the nanoparticles, which could effectively accelerate the transfer of photogenerated charges. This work demonstrates a novel type II heterojunction photocatalyst for the effective removal of organic dyes, providing fresh ideas for wastewater purification.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Ramzi Nasser,Hao Zhou,Feng Li,Habib Elhouichet,Ji-Ming Song
Heterostructured nanomaterials tend to have a high proportion of oxygen vacancies (V O ) due to the presence of heterogeneous interfaces. Herein, a new kind of heterostructured MoO 3 @CoWO 4 nanobelts was successfully evaluated as fascinating cathode material . SEM and TEM analysis indicated that the MoO 3 nanobelts were fully blanketed with CoWO 4 nanodots . The generation of Vo species was confirmed by XPS and EPR data. By profiting both synergistic and Vo generation effects, MoO 3 @CoWO 4 electrode displayed an excellent capacitance of 246 mAh·g −1 (1966 F·g -1 at 0.5 A·g −1 ) with high-rate capability of 174 mAh·g −1 (1394 F·g −1 at 30 A·g −1 ) as well as superb stability of 94 % (over 15,000 cycles). Notably, all-solid-state device delivered a good energy value of 63.1 Wh·kg −1 at 375 W·kg −1 . Interestingly, the supercapacitor device showed super-low self-discharge comportment of only 12.1 % during 24 h. Importantly, the generation of the V O defects could control the ions diffusion process and lead a sharp decrease in the self-discharge process.
研究领域:
材料科学
·
电化学
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Wiewei Meng,Ling Wang,Yuehua Li,Huizhu Zhou,Zhangxing He,Wei Meng,Lei Dai
CoWO 4 -PdO dual phase composites were successfully prepared by self-demixing of the precursor CoPd x WO 4+x (x = 0, 2%, 5%, 10%) calcined at 800 °C and used as sensing electrodes for mixed-potential type NH 3 sensors based on yttria stabilized-zirconia (YSZ) electrolyte. The materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Field-emission scanning electron microscopy (FESEM), respectively. NH 3 response performance of the sensors to different concentrations of NH 3 (20–300 ppm) was evaluated at 350–500 °C. It was found that the sensors attached with CoWO 4 -PdO sensing electrode are much more sensitive to NH 3 than the CoWO 4 -based sensor. Among them, CoWO 4 -5%PdO based sensor gives the highest sensitivity (−76.8 mV/decade at 400 °C), the response signals (Δ V ) of the sensor vary linearly with the logarithm of the NH 3 concentrations in the range of 50–300 ppm at a given temperature. The sensor also exhibits well reproducibility, stability and long-term stability. Furthermore, compared with CoWO 4 -based sensor, the introduction of PdO in CoWO 4 makes the interference of NO 2 on the sensor significantly reduced from 100% to 50%, which is attributed to the fact that the second phase PdO depresses the adsorption of NO 2 .
研究领域:
材料科学
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传感技术
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DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2024
·
IF 3.9
Sana Jawaid,Bharat Prasad Sharma,Sadam Hussain Tumrani,Zaheer Abbas,Razium Ali Soomro,Selcan Karakuş,Tarık Küçükdeniz,Ayman Nafady
The escalating levels of environmental pollution, particularly from commercially used products, highlight the imperative of efficient sensor technologies to facilitate timely and effective remediation strategies. Herein, a simple method is proposed to enhance the electrochemical performance of CoWO 4 structures by coupling them with activated carbon (AC) for direct tetrabromobisphenol A (TBPA) oxidation. The systematic comparison shows that incorporation of AC with CoWO 4 not only improves the overall effective surface area (ESA) of the catalyst by 1.8-fold but also improves the cyclic voltammetry (CV) based irreversible oxidation current by 2.0-fold owing to improved conductivity and surface characteristics. Differential pulse voltammetry (DPV) based optimization of the sensory characteristics confirmed robust electrocatalytic TBPA oxidation within a 0.1 to 1.0 µM concentration range, achieving a 0.024 µM detection limit within PBS (0.1 M) (pH 5.0). Moreover, density functional theory (DFT) analysis confirms the non-covalent interaction favorability between TBPA and CoWO 4 surface, validating TBPA’s easy adsorption onto the catalytic surface and, thus, facilitated electron mobility between the molecule and the catalyst during the surface oxidation process. The DPV sensing interpreted using machine learning (ML) algorithms confirmed the detection accuracy of the developed sensor. Among the adopted models, artificial neural networks (ANN) achieved the highest R2 score (0.9659) and the lowest values across Mean Squared Error (MSE), Mean Absolute Error (MAE), and Root Mean Squared Error (RMSE) error matrices confirming its suitability in deciphering DPV correlations. Integrating ANN with DPV based electrocatalytic oxidation sensing underscores machine learning’s potential in analyzing complex electrochemical signatures, thus advancing intelligent sensing for precise environmental monitoring.
研究领域:
环境科学
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材料科学
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电化学
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人工智能
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Guang Yang,Hao Zhang,Mingyu Dou,Hua Yang,Xingliang Yin,Dacheng Li,Haitao Zhao,Jianmin Dou
To enhance the photocatalytic activity, loading proper semiconductor with high efficiency and low cost is one of the most valid approaches. Herein, various amounts of CoWO 4 as a novel metal-free material were loaded on Mn 0.47 Cd 0.53 S (MCS) nanorods for photocatalytic hydrogen production reaction. The CoWO 4 /Mn 0.47 Cd 0.53 S-25 (CW/MCS-25) exhibits the highest hydrogen production rate of 41.53 mmol·h −1 ·g −1 in the Na 2 S/Na 2 SO 3 system, which is about 2.68 times higher than that of pristine MCS. The Mapping and HRTEM reveals the deposited of CoWO 4 on the MCS. The detailed analyses of XPS, EIS, TRPL spectra and transient photocurrent responses indicate that CoWO 4 and MCS interacted closely and the photogenerated electrons of CoWO 4 can be transferred into MCS. In particular, the introduction of CoWO 4 can further transfer the photogenerated holes of MCS, thereby inhibiting the photocorrosion of MCS and improving photocatalytic activity. This work provides a reference for the exploration of noble metal-free composite material and shows great potential in the photocatalytic application.
研究领域:
材料科学
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能源化学
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DOI
PubMed
高影响因子
CHEMICAL PHYSICS
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2024
·
IF 2
Qian Liu,Panpan Xu,Qianqian Zhang,Guangming Han,Ling Li,Limin Zhou
A series of novel MIL-53(Fe)/CoWO 4 composites were synthesized by combining MIL-53(Fe) and CoWO 4 nanoparticles via solvothermal method. The structural characterizations showed that CoWO 4 nanoparticles were uniformly distributed on the surface of hexagonal bipyramid MIL-53(Fe). Combining XPS and Mott-Schottky plots, a Z-scheme heterojunction was formed between MIL-53(Fe) and CoWO 4 , resulting in a significant improvement in the electron-hole pair separation efficiency. UV–vis diffused reflectance spectra indicated that the optical arrange of MIL-53(Fe)/CoWO 4 composites were expanded to visible light. The photocatalytic degradation experiments under visible light irradiation showed that MIL/CWO-60 synergistically with PMS degraded 90.5 % of TC-HCl within 50 min. The XRD spectra of used and unused composites were identical, indicating good stability in four consecutive cycles. Electron paramagnetic resonance (EPR) and free radicals trapping experiment revealed that active species included O 2− , SO 4 − , h + , OH and 1 O 2 , and mechanism of the synergistic degradation of TC-HCl by MIL-53(Fe)/CoWO 4 composites and PMS was proposed.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jie Wei,Zhiting Liu,Yanxing Zhang,Zongxian Yang,Zehao Sun,Yunpeng Li,Zhenxiang Cheng
Recently, direct Z-scheme heterojunction catalysts have become an important hotspot in photocatalytic applications due to their much stronger redox capabilities. Novel direct Z-scheme CdS@CoWO 4 spherical heterojunction photocatalysts were ingeniously designed and synthesized herein. The structural characterization and morphology analysis demonstrated that homogeneous heterojunctions between CdS and CoWO 4 were indeed formed in the composite photocatalysts. Moreover, CdS@CoWO 4 heterojunction photocatalysts exhibited excellent degradation capability towards refractory micropollutants (Pharmaceutical intermediates, dyes, and industrial additives, etc ) in wastewater. Especially, the strongest photocatalytic activity reflected by the highest reaction kinetic parameter ( k = 8.13 × 10 −2 min −1 ) was observed in the CdS-2CoWO 4 catalyst with the mass ratio of CdS:CoWO 4 = 1:2, which is nearly 4 and 58 times as high as that of pure CdS ( k = 2.21 × 10 −2 min −1 ) and CoWO 4 ( k = 1.39 × 10 −3 min −1 ), respectively. First-principles study combined with the radical species trapping experiments revealed that the charge transfer pathways and mechanisms in these heterojunctions favor the direct Z-scheme rather than the traditional Type-II mode. A key built-in electric field formed at the contact interfaces of CdS and CoWO 4 drives the Z-scheme charge transfer mechanism, which strengthens the redox capacity of photogenerated carriers and ultimately greatly enhances the photocatalytic activity of the heterojunction catalysts. It is worth applauding that CdS and CoWO 4 can form such Z-scheme heterostructures in a wide span of component ratios, which is of great benefit for their practical applications in environmental remediation.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Li Li,Kaixuan Kuang,Xiuzhen Zheng,Jiahui Wang,Wei Ren,Jingbiao Ge,Sujuan Zhang,Shifu Chen
To enhance the efficiency of photocatalytic H 2 evolution, numerous methods are employed by increasing the utilization of photogenerated charge carriers (PCCs), including catalyst design, defect regulation, and selection of suitable H + resources. Using self-assembly method, CoWO 4 /Zn x Cd 1−x S with p–n heterojunction was synthesized. Although CoWO 4 (CW) cannot produce H 2 under visible light irradiation, it can provide photogenerated electrons (e − ) to Zn 0.3 Cd 0.7 S (ZCS), and largely increase the photocatalytic activity of ZCS. The optimal CW/ZCS composite can reach 15.58 mmol·g −1 ·h −1 , which is 45.8 and 24.3 times higher than the values of the pure CdS and ZCS, respectively. The largely enhanced photocatalytic H 2 production is attributed to the Zn vacancies (V Zn ), p–n heterojunction, and p-chlorobenzyl alcohol (Cl–PhCH 2 OH) as the H + source of H 2 production. V Zn on the ZCS surface as the capture center of photogenerated holes (h + ), can regulate the carrier distribution, which results in more photogenerated e − and less generated h + . The combination of p–n heterojunction and V Zn can enhance the separation and transfer efficiency of PCCs, and effectively inhibit the recombination of charge carriers. To further improve the utilization rate of PCCs, the photocatalytic H 2 evolution is proceeded by Cl–PhCH 2 OH oxidation in N , N -dimethylformamide solution, with 4-chlorobenzaldehyde (Cl–PhCHO) generated. The separated photogenerated e − and h + both participated in the redox reaction of H + reduction and Cl–PhCH 2 OH oxidation, considering that the amount of H 2 and Cl–PhCHO products are close to 1:1. This work not only facilitates the separation and transfer of PCCs, but also provides directions for the design of efficient photocatalysts and H 2 evolution in the organic phase.
研究领域:
材料科学
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能源化学
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光催化
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DOI
PubMed
高影响因子
ChemElectroChem
·
2015
·Vol. 2
·期 12
·2061-2070
·
IF 0
Sheng-Hui Liao,Shi-Yu Lu,Shu-Juan Bao,Ya-Nan Yu,Ling Yu
Graphical You spin me right round : Porous WO 3 , Co 3 O 4 , and CoWO 4 are fabricated by using an electrospinning technique followed by high-temperature calcination. The different NFs are used to modify biosensor electrodes and detect H 2 O 2 without the help of enzymes. The results provide a new insight that enables excellent nonenzymatic biosensors to be explored. In this work, porous WO 3 , Co 3 O 4 , and CoWO 4 nanofibers (NFs) were fabricated by using an electrospinning technique followed by high-temperature calcination. The different NFs were used to modify biosensor electrodes and detect H 2 O 2 without the help of an enzyme. The electrochemical results indicated that the CoWO 4 NF-based sensor presented a remarkable electrocatalytic activity towards H 2 O 2 oxidation, including lower redox potential, lower detection limit, fast response, as well as the widest linear range among our designed biosensors of this type. Furthermore, we found that the ideal test potential of a nonenzymatic biosensor is closely dependent on the composition of the detected electrode surface, and the test potential has a great effect on the detection linear range of nanomaterial-based biosensors. The results of this work provide a new way to explore excellent nanomaterials for modifying nonenzymatic biosensor electrodes.
研究领域:
材料科学
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生物传感
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电化学
✓ 已验证
DOI
ENVIRONMENTAL RESEARCH
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2024
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IF 7.7
Junlong Zhang,Jie Wei,Jianting Li,Minchuan Xiahou,Zehao Sun,Ao Cao,Youxin Yuanfeng,Guogang Chen,Yanchun He
The indiscriminate discharge of micropollutants ( e.g. , dyes, antibiotics, industrial additives, etc .) represents a significant risk to human health, and the removal of these substances from water bodies has become a prominent area of research within the field of environmental remediation. A simple hydrothermal-precipitation-photoreduction method was employed to synthesize novel Z-scheme heterojunction photocatalysts of AgBr/CoWO 4 /Ag. The catalysts demonstrated remarkable degradation capabilities with regard to a range of micropollutants present in wastewater. Of the catalysts tested, 5AgBr/CoWO 4 /Ag exhibited the highest degradation rates, reaching 98.58% for Rhodamine B, 86.82% for tetracycline hydrochloride, and 95.60% for 2-mercaptobenzothiazole within 60 min. In particular, the reaction kinetic rate of 5AgBr/CoWO 4 /Ag towards Rhodamine B degradation ( k 2 = 0.26278 L mg −1 ·min −1 ) is 9 times that of AgBr ( k 2 = 0.02953 L mg −1 ·min −1 ) and 113 times that of CoWO 4 ( k 2 = 0.00233 L mg −1 ·min −1 ), which serves to highlight the exceptional photocatalytic activity of the material. The experimental data and subsequent analysis indicated that the enhanced photocatalytic performance can be attributed to two factors: firstly, the electron mediation by Ag nanoparticles leading to improved charge separation efficiency, and secondly, the formation of Z-scheme heterojunctions between AgBr and CoWO 4 . The cyclic tests provided confirmation of the excellent stability and recyclability of the AgBr/CoWO 4 /Ag photocatalysts. It is anticipated that this study will facilitate the development of novel methods for the degradation of refractory micropollutants and provide insights into environmental remediation, thereby contributing to the sustainable development of society.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Haixia Liu,Qingzhu Yang,Wei Guo,Huiming Lin,Feng Zhang,Jingxiang Zhao,Tianyue Ma,Le Zhao,Na Xu,Ruiwen Wang,Jingyao Yu,Fengyu Qu
Although phototherapy has received widespread attention in recent years due to its high efficiency, low invasiveness, and minor side effects, there are still few studies on the relationship between phototherapy and immunotherapy. Therefore, non-stoichiometric CoWO 4-x nanoparticles (NPs) were strategically designed and prepared, as these can simultaneously generate hyperthermia and reactive oxygen species (ROS) under near-infrared laser irradiation, illustrating that they can be used to realize photothermal therapy (PTT) and photodynamic therapy (PDT) on tumors. CoWO 4-x NPs not only have strong near-infrared absorption, outstanding biocompatibility, and excellent photothermal stability but they also can be used as photoacoustic (PA) and Computer Tomography (CT) contrast agents for working with tumors. In particular, the relationships between phototherapy, immunogenic cell death (ICD) and immunoresistance are here discussed in depth, and enhanced phototherapy was achieved for the first time by injecting etoposide and ML385, which are two typical inhibitors for HSP60 and NRF2, respectively. Furthermore, the biocompatibility of materials in vivo was demonstrated through a variety of cell experiments, changes in mouse body weight, and histological analyses. Our work highlights the great potentials of non-stoichiometric CoWO 4-x NPs as a kind of multifunctional therapeutic agent for implementing enhanced phototherapy in breast cancer by reducing the immunoresistance of HSP60 and NRF2 toward PTT and PDT.
研究领域:
纳米技术
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癌症治疗
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免疫学
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生物医学工程
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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）