APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Yi Yang,Jingjing Liu,Miaoli Gu,Bei Cheng,Linxi Wang,Jiaguo Yu
Coupling photocatalytic H 2 O 2 evolution with simultaneous furfuryl alcohol oxidation can avoid the slow water oxidation reaction and fully utilize photogenerated carriers to produce valuable chemicals. Herein, a COF (denoted as BTTA) was synthesized by the Schiff-base condensation and in-situ grown on the surface of TiO 2 nanofibers. The resultant TiO 2 /BTTA composite has a large interface and a short carrier migration distance. Furthermore, the porous and ultrathin BTTA layers endow the composites abundant active sites and excellent light absorption ability. Remarkably, a H 2 O 2 -evolution rate of 740 μmol L −1 h −1 and a furoic alcohol conversion of 96 % are achieved. In-situ irradiated X-ray photoelectron spectroscopy and electron spin resonance confirm the S-scheme carrier transfer mechanism, which spatially separates photogenerated carriers with strong redox power. This work opens a new door to the rational design of S-scheme photocatalysts for economic and green photosynthesis of H 2 O 2 and organic compounds.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
ANALYST
·
2012
·Vol. 137
·期 24
·5803-5808
·
IF 4.23
Chuantao Hou,Qin Xu,Lina Yin,Xiaoya Hu
Co3O4 nanoparticles (NPs) with an average diameter of about 20 nm were synthesized by using MOFs as a template. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to characterize the as-prepared Co3O4 NPs. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) were used to confirm the structure of the Co3O4 NPs. Then the Co3O4 NPs were modified on a glassy carbon electrode (GCE) to obtain a non-enzymatic glucose and H2O2 sensor. The NPs show electrocatalytic activity toward oxidation of glucose and H2O2 in alkaline medium. For glucose detection, the developed sensor shows a short response time (less than 6 s), a high sensitivity of 520.7 μA mM−1 cm−2, a detection limit of 0.13 μM (S/N = 3), and good selectivity. The high concentration of NaCl does not poison the electrode. Its application for the detection of glucose in a human blood serum sample shows good agreement with the results obtained from the hospital. Furthermore, the proposed sensor was used for the detection of H2O2. The results indicate that the detection limit and sensitivity for H2O2 are 0.81 μM and 107.4 μA mM−1 cm−2, respectively. Determination of H2O2 concentration in a disinfectant sample by the proposed biosensor also showed satisfactory result. The high sensitivity and low detection limit can be attributed to the excellent electrocatalytic performance of the as-prepared Co3O4 NPs. These results demonstrate that the as-prepared Co3O4 NPs have great potential applications in the development of sensors for enzyme-free detection of glucose and H2O2.
研究领域:
生物化学
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材料科学
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分析化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wanwan Li,Jiao Liu,Chao Chen,Yidong Zhu,Nan Liu,Yuman Zhou,Siru Chen
It is urgent to develop highly active catalysts toward hydrogen peroxide (H 2 O 2 ) sensor in many industrial and biological processes, which usually is limited by high cost of instrumentation requirements and low-accuracy detection at low level. Herein, Cu 2 O@Cu 9 S 5 yolk-shell nanospheres has been synthesized via a facial wet chemical method and applied as electrocatalyst for non-enzymatic H 2 O 2 sensor. These Cu 2 O@Cu 9 S 5 yolk-shell nanospheres with mean sizes of 230 nm consisting of Cu 2 O conductive core and Cu 9 S 5 shell show numerous advantageous characteristics of well-sustained structural integrity, the homogeneous particle size distribution and visible mesoporosity morphology. The significantly improved electrocatalytic activity by catalyzing H 2 O 2 of the Cu 2 O@Cu 9 S 5 yolk-shell nanospheres as a sensor has been obtained by comparing with those neat Cu 2 O nanospheres and Cu 9 S 5 hollow nanospheres. This noticeable property is largely due to the synergistic catalysis effect of the contribution of the Cu 2 O and Cu 9 S 5 . Cu 2 O@Cu 9 S 5 yolk-shell nanospheres based non-enzymatic H 2 O 2 sensor displays the relatively wide linear range from 0.1 μM to 3.5 mM with a high sensitivity of 299.74 μA mM −1 cm −2 but low detection limit of 28.83 nM (S/N ≥ 3) for electrochemical detection of H 2 O 2 , which is potentially superior to other similar Cu 2 O-based sensors that has been reported in the literatures. Additionally, this sensor also demonstrates excellent selectivity of H 2 O 2 in the presence of various coactive interferences. This novel Cu 2 O@Cu 9 S 5 yolk-shell nanospheres electrocatalyst provides a broad application prospect for H 2 O 2 sensing.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 13
·5445-5457
·
IF 3.553
Zhang Xinmeng,Mao Zixuan,Zhao Yuanxiao,Wu Yuanting,Liu Changqing,Wang Xiufeng
Co 3 O 4 is often used to detect H 2 O 2 . However, there are many problems such as low sensitivity and the long detection time when detecting H 2 O 2 in various cobalt oxide composites. Therefore, it is a great challenge to develop different morphologies of the Co 3 O 4 electrode to improve the detection performances of H 2 O 2 effectively. In this paper, we had successfully prepared a novel Co 3 O 4 /reduced graphene oxide/carbon cloth (Co 3 O 4 /rGO/CC) composite. We used a simple template method. Co 3 O 4 nanosheets with a diameter of about 47.7 nm were obtained by using graphene oxide as a template. Then, CC was used as a three-dimensional conductive support material. CC can inhibit the agglomeration of rGO to increase specific surface area and to enhance the conductivity of Co 3 O 4 . In this study, the electrochemical performances of the Co 3 O 4 /rGO/CC electrode were tested by the electrochemical workstation. The trigger response of the modified electrode was reduced by 0.067% and the relative standard deviation was 0.013% after 30 consecutive tests. The range of linearity was 0.387–63.523 mM. Besides, this electrode has the limit of detection (0.022 μM) and a higher sensitivity (0.9683 mA mM −1 cm −2 ). It indicated that the electrode has excellent electrochemical sensing performance and high stability. These excellent performances are mainly due to the synergistic effect of Co 3 O 4 nanosheets, rGO, and CC.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2020
·
IF 3.465
Xiaodong Xin,Shaohua Sun,Anran Zhou,Mingquan Wang,Yan Song,Qinghua Zhao,Ruibao Jia
Sulfonamide antibiotics in water have raised public concern, owing to their stability and capacity to induce microbial resistance. We investigated the degradation efficiencies of photolysis by ultraviolet light and photolysis combined with hydrogen peroxide treatment. Combining ultraviolet light irradiation with hydrogen peroxide treatment was more effective at removing sulfadimethoxine than irradiation alone or UV/persulfate system. We also assessed the effects of hydrogen peroxide concentrations, reaction time, and the composition of the water matrix. The removing efficiency of sulfadimethoxine was negatively affected by high concentrations of hydrogen peroxide and with increasing alkalinity (pH 7.5–9.0). A tentative degradation pathway was proposed, involving the initial one-electron oxidation of sulfadimethoxine by ·OH and further reactions of the formed cation intermediate. We assessed the acute toxicity of the transformation products to Vibrio fischeri , and found that combining ultraviolet light irradiation with hydrogen peroxide treatment exerted lower toxicity to the bacterium than irradiation alone.
研究领域:
环境科学
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水处理工程
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毒理学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Shengnan Chen,Zhiwei Zhao,Chuang Wang,Fuyi Cui
Ultrafiltration (UF) is widely used in drinking water plants; however, membrane fouling is unavoidable. Natural organic matter (NOM) is commonly considered as an important pollutant that causes membrane fouling. Herein, we proposed VUV/H 2 O 2 as a UF pretreatment and used UV/H 2 O 2 for comparison. Compared to UV/H 2 O 2 , the VUV/H 2 O 2 system presented superior NOM removal. In the VUV/H 2 O 2 system, the steady-state concentration of HO• was approximately twice that in the UV/H 2 O 2 system, which was ascribed to the promoting effect of the 185 nm photons. Specifically, 185 nm photons promoted HO• generation by decomposing mainly H 2 O at a low H 2 O 2 dose or by decomposing mainly H 2 O 2 at a high H 2 O 2 dose. The VUV/H 2 O 2 pretreatment also demonstrated better membrane fouling mitigation performance than did UV/H 2 O 2 . An increase in the H 2 O 2 dose promoted HO• generation, thereby enhancing the performance of NOM degradation and membrane fouling alleviation and shifting the major membrane fouling mechanism from cake filtration to standard blocking. The VUV/H 2 O 2 (0.60 mM) pretreatment effectively reduced disinfection byproducts (DBPs) formation during chlorine disinfection. Additionally, the oxidant H 2 O 2 affected the membrane surface morphology and performance but had no evident effect on the mechanical properties. In actual water treatment, the VUV/H 2 O 2 pretreatment exhibited better performance than the UV/H 2 O 2 pretreatment in easing membrane fouling, ameliorating water quality, and reducing DBPs formation and acute toxicity.
研究领域:
环境科学
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水处理工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 12
·126503
·
IF 3.1
Tinghua Li,Shuai Kang,Fan Zhang,Xiong Sheng,Shoubo Li,Wenqiang Lu,Donglai Zhu,Zhiqiang Li
The two-electron oxygen reduction reaction (ORR) using an electrochemical method is considered a viable green technology for generating H2O2. Platinum group metals demonstrate excellent H2O2 generation performance due to their superior ORR activity and stability. However, the high cost of these electrocatalysts is a significant barrier to the widespread adoption of this technology, prompting research into non-precious metal catalysts as alternatives. In this work, Co3O4 nanoparticles with sized from 5 to 10 nm were synthesized on MXene sheets. Compared with Co3O4/C and MXene, the results indicated that Co3O4/MXene exhibited the best electrochemical performances, with an electron transfer number of ∼3.1 during oxygen reduction and an H2O2 selectivity of ∼47%. Co3O4/MXene also demonstrated great stability. After 5000 cycles, the H2O2 selectivity and electron transfer number remained at 50% and 3.0, respectively. After 12 h of continuous testing, Co3O4/MXene exhibited a high Faraday efficiency of 50% and H2O2 yield of 0.14 mol h−1 g−1, with H2O2 selectivity increasing to 68.7% and an electron transfer number of 2.6. The excellent electrochemistry is attributed to the synergistic effect between MXene and Co3O4. This study provides valuable insights into non-precious metal electrocatalysts for H2O2 generation.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Guoqiang Zhao,Xiaoyu Tao,Tongsen Guo,Liangjie Fu,Huaming Yang
Solution-phase epitaxy is a versatile method to synthesize functional nanomaterials with customized properties, where supports play a central role as they not only serve as nucleation templates but also greatly affect the local electronic structures. However, developing functional supports remains a great challenge. Herein, inspired by the commonly observed epitaxy of minerals in the natural environment, we report using calcination-modified kaolinite as the support for the epitaxial growth of hexagonal CoO nanoparticles (h-CoO NPs), which enables over 40 times higher mass-specific activity toward H2O2 electrochemical activation than the counterpart without the support. High-resolution electron microscopy, magic-angle spinning nuclear magnetic resonance, and X-ray absorption fine structure results prove that the Al sites in kaolinite play a crucial role in the formation of h-CoO NPs. Moreover, the five-coordinate Al (AlV) sites produced by the dehydration of kaolinite are indispensable for forming the epitaxial interface. Theoretical calculations reveal that the local electron densities around AlV sites are lower than those of general six-coordinate Al sites, which render AlV sites with strong adsorption capability that facilitates the nucleation of h-CoO NPs. Also, the AlV sites induce the electron transfer from h-CoO to the kaolinite support that results in the upshift of the Co 3d band center and hence improve the H2O2 activation kinetics. Our results demonstrate the superiority of nanoclay as functional supports and could offer a more benign strategy to the solution-phase epitaxy production of functional nanomaterials for diverse applications.
研究领域:
材料科学
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电化学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Jianqing Zhou,Qiancheng Zhu,Hao Hu,Wenjuan Chen,Ying Yu
Spinel Li 4 Ti 5 O 12 known as a “zero-strain” anode material for Li-ion battery has attracted much attention because of its superior safety and stability. Herein, we report a novel H 2 O 2 -assisted one-step hydrothermal method to synthesize different ratio Li 4 Ti 5 O 12 /TiO 2 composites with the same amount of raw materials. For the first time, Li 4 Ti 5 O 12 was prepared directly from commercial titania with the presence of H 2 O 2 , and different proportion Li 4 Ti 5 O 12 /TiO 2 composites were fabricated only by adjusting the amount of H 2 O 2 . The reaction mechanism of the novel H 2 O 2 -assisted method was clearly investigated, and H 2 O 2 plays a crucial role in the formation of intermediate Li 1.81 H 0.19 Ti 2 O 5 ·2H 2 O. Further, the electrochemical performance of different ratio Li 4 Ti 5 O 12 /TiO 2 composites have been investigated. This facile method is also applicable for the preparation of Na 2 Ti 6 O 13 /TiO 2 material, and provides us the new way to fabricate composite materials.
研究领域:
材料科学
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能源存储
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纳米技术
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Xiao Du,Jun Wan,Jia Jia,Chao Pan,Xiaoyun Hu,Jun Fan,Enzhou Liu
Ag 3 PO 4 -Bi 2 MoO 6 heterojunctions with visible-light photocatalytic activity were successfully fabricated via a deposition-precipitation method. The investigation shows that Ag 3 PO 4 -Bi 2 MoO 6 composites exhibit enhanced visible light harvesting ability and better degradation efficiency for RhB compared with Bi 2 MoO 6 and Ag 3 PO 4 under visible light irradiation (λ > 420 nm). What's more, we found that the activity and the stability of Ag 3 PO 4 -Bi 2 MoO 6 heterojunction could be further improved by adding of H 2 O 2 in the RhB reaction solution. The enhanced photocatalytic performance and structure stability are primarily attributed to the efficient charge carrier separation of the heterojunction formed by Ag 3 PO 4 and Bi 2 MoO 6 , and the electron capturing property of H 2 O 2 on the surface of Ag 3 PO 4 -Bi 2 MoO 6 composites, leading to a highly efficient removal of RhB using the Ag 3 PO 4 -Bi 2 MoO 6 -H 2 O 2 system. In addition, the active species trapping experiments indicate that h + and •O 2 – play important roles during the photocatalytic degradation process . This work suggests that the H 2 O 2 assisted Ag 3 PO 4 -Bi 2 MoO 6 heterojunction system could be a potential promising photocatalyst for environmental remediation.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jing Zhang,Miaoqi Liu,Bo Pang,Chun Liu,Junjun Ma,Jianrui Niu,Ruina Zhang
Microbubble ozonation combined with electro-generated H 2 O 2 process ( E H 2 O 2 -MB-O 3 ) was applied to degrade ciprofloxacin (CIP) as a typical antibiotic in wastewater in this study. The results showed that the performance of CIP degradation and mineralization in E H 2 O 2 -MB-O 3 process was more efficient than other related processes. Microbubble ozonation and electro-generated H 2 O 2 showed obvious synergistic effect on enhanced CIP removal in E H 2 O 2 -MB-O 3 process. The O 3 dosage, applied current and initial pH in E H 2 O 2 -MB-O 3 process were optimized as 12.5 mg/min, 50 mA and 7.0 (uncontrolled). Under the optimal conditions, CIP could be degraded completely within 60 min and the TOC removal efficiency of 28.85% could be achieved within 90 min in E H 2 O 2 -MB-O 3 process. The corresponding ozone utilization efficiency was close to 100%. More efficient ROS generation was observed in E H 2 O 2 -MB-O 3 process, especially •OH, compared with other related processes. The contribution rates of •OH, 1 O 2 , O 3 and O 2 .- to CIP removal were determined as 66.79%, 23.57%, 6.67% and 2.98% in E H 2 O 2 -MB-O 3 process, respectively. The electro-generated H 2 O 2 was clarified to contribute to not CIP removal but ROS generation. Three CIP degradation pathways were proposed according to identified degradation intermediates, which indicated that pyridone structure of quinoline and piperazine ring in CIP molecule could be destroyed more easily than benzene ring of quinoline, and the hydroxylation seemed to prevail in these CIP degradation pathways due to •OH electrophilic addition reaction probably. The removal of other antibiotics in E H 2 O 2 -MB-O 3 process also depended on not ozone direct oxidation but •OH oxidation mainly.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2024
·Vol. 11
·期 24
·2400234
·
IF 4.3
Xue Shang,Panpan Chen,Wei Ling,Tian Hang
A novel synthesis strategy for hierarchical polypyrrole nanopillar/silver nanoparticle arrays is designed and its application as an antibacterial surface and nonenzymatic H 2 O 2 sensor is explored. The hierarchical structure is fabricated using a microporous membrane-templated method by multiple steps. Using a polypyrrole nanopillar array as the matrix, silver nanoparticles can be uniformly reduced and stably anchored onto the nanopillar array by a redox reaction in a AgNO 3 solution. The morphology, structural characteristics, conductivity, and reaction mechanisms of the composites are studied in detail. The incorporation of Ag nanoparticles not only significantly enhanced the antibacterial activity of the surface, but also contributed to the excellent ability to detect H 2 O 2 . This work provides a versatile approach to achieve the controlled fabrication of hierarchical metal-conducting polymer composite structures and demonstrates them as promising multifunctional interfaces with antibacterial and sensing activity.
研究领域:
材料科学
·
生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）