FUEL
·
2025
·
IF 7.5
Wei Wen,Chunying Wang,Xudong Chen,Jingyi Wang,Yaobin Li,Fei Wang,Wenpo Shan,Ping Ning,Kai Li
Two-dimensional materials have garnered significant attention in the field of catalysis due to their high electron transfer efficiency. In this study, a quasi-two-dimensional carbon–nitrogen doped cobalt-based catalyst (Co-N-C (F)) was synthesized for the investigation of formaldehyde (HCHO) oxidation at room temperature. The electronic coordination structure of the catalyst was modified by varying the calcination temperature, resulting in the formation of Co-N 4 sites that enhance the degradation of the intermediate formate. Additionally, the quasi-2D structure formed during high-temperature pyrolysis retains characteristics of the ZIF 3D material, with a high specific surface area and a porous aggregation structure, which further enhances the exposure of active centers and diffusion of the feed gas. Characterization results showed that the number of Co-N 4 sites on the catalysts increases with the rise in pyrolysis temperature, with the Co-N-C (F)-1000 catalyst exhibiting the highest concentration of Co-N 4 sites. Activity test results indicated that the Co-N-C (F)-1000 catalyst achieved a 100 % HCHO removal rate at 25 °C, with WHSV 200,000 mL/(g·h). In contrast, the activity of the Co-N-C (F)-1100 catalyst decreased, which could be attributed to the aggregation of Co particles at excessively high temperatures. The HCHO oxidation mechanism of the Co-N-C (F) catalysts was investigated using in situ diffuse reflectance infrared spectroscopy ( in situ DRIFTS), and the reaction was found to follow the sequence HCHO → HCOO − → CO 2 + H 2 O, with formate degradation as a rate-limiting step.
研究领域:
催化材料
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环境科学
·
化学工程
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DOI
高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Ning Xiang,Xiaojin Han,Yarong Bai,Qiaoyan Li,Jianfeng Zheng,Yulin Li,Yaqin Hou,Zhanggen Huang
Supported noble metal catalysts have been widely utilized for HCHO catalytic oxidation. When the active components are fixed, the altering and regulation of the supports would have a huge effect on catalytic performance. Here, two types of Pd/γ-Al 2 O 3 catalysts with different support size (micro-γ-Al 2 O 3 and nano-γ-Al 2 O 3 , respectively) were fabricated and used for HCHO oxidation. Compared with the micro-sized counterpart, the Pd/nano-γ-Al 2 O 3 catalyst exhibited much superior HCHO oxidation performance which could totally oxidize 160 ppm of HCHO into harmless CO 2 under a WHSV of 100,000 mL g cat −1 h −1 at room temperature. Multiple characterizations including XRD, BET, TEM, CO chemisorption, FT-IR, O 2 -TPD, XPS and in situ DRIFTS were implemented to study the effect of γ-Al 2 O 3 support size on physicochemical properties of Pd/γ-Al 2 O 3 catalysts and elucidate the structure-activity relationship. The results revealed that large specific surface area, rich surface OH groups as well as high curvature of nano-γ-Al 2 O 3 not only facilitated HCHO adsorption, but also stabilized highly dispersed Pd species which then promoted the activation of oxygen and boosted formate species decomposition, and consequently leading to the enhanced HCHO oxidation performance of Pd/nano-γ-Al 2 O 3 . This work deepens the comprehension of support size-dependent activity of Pd/γ-Al 2 O 3 catalysts for HCHO oxidation and provides an alternative method to prepare high-performance Pd catalysts for HCHO oxidation.
研究领域:
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Shaofei Zhang,Hui Yang,Ying Ma,Yu Fang
A bis-nitrobenzoxadiazole (NBD) derivative of calix[4]arene (L 1 ) and a control compound (L 2 ), mono-NBD derivative of the calixarene were designed and prepared via click chemistry. Fluorescence studies demonstrated that L 1 as created can function as a switch with the presence of Ag + in THF, of which the free state of L 1 emits at ∼527 nm, but the binding state at 576 nm. Based upon this discovery, L 1 was studied as a chemo-sensor of Ag + in a mixture solvent of THF and H 2 O with a detection limit (DL) of ∼6.2 × 10 −7 mol/L. Presence of other commonly found metal ions shows little effect upon the determination. Moreover, the L 1 in the Ag + -L 1 complex could be fully released with introduction of HCHO, a bases for the sensitive and selective detection of the toxic chemical. The DL of this test is 6.6 × 10 −7 mol/L. Interestingly, binding and releasing of the fluorescent ligand could be repeated for at least 5 times. Furthermore, both sensing could be performed in a visualized manner. It is believed that the fluorescent compound as created should have a potential to find real-life applications.
研究领域:
化学
·
分析化学
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产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Lulu Guo,Shushu Zhao,Guimao Yang,Lifeng Gao,Yanhong Wu,Xuguang Zhang
Perovskite oxide semiconductors have attracted tremendous interest in gas sensing due to their promising properties of tunable active sites, excellent catalytic ability and good structural stability. Nevertheless, the rapid synthesis of perovskite oxides and controlled regulation of their surface oxygen vacancies remains a great challenge. Herein, we report a novel metal–organic frameworks (MOFs) self-template strategy for the rapid and large-scale preparation of LaFeO 3 nanoparticles (M−LaFeO 3 ) with abundant oxygen vacancies. Benefit from the introduction of oxygen vacancies, the resultant M−LaFeO 3 gas sensor exhibit excellent formaldehyde (HCHO) sensing performance at a low operating temperature of 160 °C, including high sensitivity (R g /R a = 8.9 @ 100 ppm), fast response/recovery rate (53 s/32 s), low detection limit (1 ppm) and excellent selectivity. Comprehensive density functional theory (DFT) calculation and spectral characterizations reveal that oxygen vacancies play a vital role in promoting the adsorption and activation of O 2 and HCHO molecules, and accelerate the chemical reaction on the sensing materials surface. Most importantly, it proves the promising application of M−LaFeO 3 sensor in food safety assessment. This work not only provides a simple strategy for constructing oxygen vacancies enriched LaFeO 3 , but also demonstrates the application potential of LaFeO 3 -based gas sensors in the field of formaldehyde detection.
研究领域:
材料科学
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化学
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传感器技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Ning Luo,Xiaqing Zhang,Lujia Zhu,Yuqing Yin,Jiarui Wu,Tong Li,Congcong Liu
ZZP-TENGs are designed for monitoring the HCHO concentration with high-pressure gas streams. • ZZP-TENG exhibited excellent sensing performance of HCHO. • ZZP-TENGs can be employed to construct an HCHO early warning system. • ZZP-TENG is applicable for detecting changes in indoor HCHO concentration. Formaldehyde (HCHO), a hazardous volatile organic compound, poses serious threats to human health in daily life and industrial environments. Herein, a pulse airflow-driven triboelectric nanogenerator (ZZP-TENG) with a ZIF-8/ZIF-67/copper foam composite microstructure was fabricated for high-sensitivity HCHO detection. Benefiting from micro/nano structural modification, the ZZP-TENG efficiently harvested ambient mechanical energy, yielding a short-circuit current of 3.62 μA and a maximum output power of 45.63 μW. Its stable energy output could drive 54 LEDs and charge various capacitors, demonstrating reliable energy-harvesting capacity. The sensor exhibited an 80% response toward HCHO at 40 ppm, along with a 30 s response time and an 80 s recovery time at 20 ppm. To verify practical indoor application feasibility, a simulated post-renovation HCHO release scenario was constructed with HCHO-containing wood blocks, supporting accurate indoor air quality assessment and environmental safety evaluation. In this study, an improved extreme learning machine (ELM) algorithm was employed to classify HCHO signals from the ZZP-TENG sensor. The ELM model realized 100% HCHO concentration recognition accuracy and constructed a three-level safety early warning system, achieving real-time intelligent indoor HCHO monitoring. This work realizes simultaneous airflow energy harvesting and HCHO detection, providing a novel route for integrated gas sensors and broadening the application of TENGs in self-powered indoor environmental monitoring. After the decoration of indoor residential and office spaces, formaldehyde (HCHO) is continuously released from building materials, furniture, and coatings, posing a serious threat to human health due to its chronic toxicity and carcinogenicity. When HCHO accumulates beyond the safe threshold, it causes eye irritation, respiratory inflammation, and long-term immune system disorders. In this study, a pulse airflow-driven triboelectric nanogenerator (ZZP-TENG) with a ZIF-8/ZIF-67/copper foam composite microstructure was fabricated for high-sensitivity HCHO detection. The self-powered device efficiently harvested ambient mechanical energy and delivered sufficient electrical output for continuous sensing. By integrating with a machine learning framework, the system achieved precise and graded evaluation of dynamic formaldehyde concentration throughout a six-week natural attenuation process. Furthermore, the integrated wireless alarm system enables real-time risk warning once pollutants exceed the safety threshold, realizing intelligent, long-term, and safe indoor air quality monitoring for residential and office environments. Download: Download high-res image (182KB) Download: Download full-size image
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122776
·
IF 7.5
Yao Weng,Shuping Zhang,Yaoyao Wu,Shimeng Chang,Chenliang Zhou,Guan Peng,Wenjing Yuan
The behavior of formaldehyde (HCHO) degradation depends strongly on reactive oxygen species (ROS), including singlet oxygen ( 1 O 2 ), superoxide radical (•O 2 - ), and hydroxyl radical (•OH). However, the π electrons in-plane of conventional sp 2 carbon materials are difficult to transfer to the out of plane active site because it is too inert, resulting in an inefficient yield of ROS. This research provides fundamental insights into significantly promoting the ROS generation. Experimental and density functional theory (DFT) computational study reveal that an efficient electron transfer enrichment is achieved from C-N polar bond to N-Pd polar bond to Pd site, which further interact with oxygen molecule to generate •O 2 - (e - + O 2 → •O 2 - ), 1 O 2 (2•O 2 - + 2H 2 O → 1 O 2 + H 2 O 2 + 2OH - ) and •OH (H 2 O 2 + e - → •OH + OH - ), triggering the conversion of HCHO into CO 2 and H 2 O. The results establish that the polar bonds in support are crucial, which provides a new opportunity in designing high performance catalysts.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Shuwen Han,Xinwei Li,Yan Tan,Yu Huang,Zhongbiao Wu,Meng Wang,Wingkei Ho,Shun-cheng Lee
In this work, novel heterostructured SrTiO 3 /SrCO 3 (STO/SCO) interface was constructed via the one-pot g-C 3 N 4 (CN) self-sacrificing hydrothermal strategy. The as-developed STO/SCO photocatalyst shows the air cleaning potential in continuous-flow reactors with degradation rates of NO and HCHO at 44 % and 40 %, respectively. From XRD, FTIR, and XPS analysis, CN participates in the crystallise process as the source of CO 3 2− to form the STO/SCO interface viewed by TEM and HRTEM. Subsequent temperature-programmed desorption (TPD) analysis and density functional theory (DFT) calculation results revealed the enhanced chemisorption effects of O 2 on the catalyst surface. The existence of oxygen vacancies combined with the formation of heterojunction surface induces intermediate levels, which leads to the photocatalytic oxidation under simulated solar light. Charge difference distribution simulation coupled with electrochemistry and photoluminescence tests confirmed the internal-built electron fields at the heterojunction interface which would be beneficial for photocarriers separation. Based on the above-mentioned effects, enhanced reactive oxygen species (ROS) OH and O 2 − were detected under light irradiation by electron spin resonance (ESR). This work demonstrates the effectiveness of in-situ self-sacrificed strategy for construction of heterojunction interfaces and provides opportunities by utilising insulator-based materials for photocatalytic degradation of air pollutants.
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
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Qingyu Xu,Hui Sun,Mingguang Ren,Fangong Kong
As a class of environmental pollutants and carcinogens, abnormal levels of formaldehyde (HCHO) can cause great harm to living organisms. In this work, a sensitive, biocompatibility, highly selective and rapid response cellulose-based fluorescent probe ( HEC-FA ) functionalized with hydrazinyl naphthalimide was designed for HCHO detection. A “turn-on” fluorescence response of naphthylamine fluorophores was triggered based on the principle that the reaction of HCHO and -NH-NH 2 limits the photoinduced electron transfer (PET) process. HEC-FA showed a significant fluorescence response to HCHO at 552 nm. The probe can achieve rapid identification of HCHO within 2 min with a fluorescence response multiple of 12.3-fold and the limit of detection was 0.09 ppm (2.97 μM). In addition, it can be served as fluorescence imaging of HCHO in HepG2 cells. The practical performance of the HEC-FA can be greatly improved by making it into gel and test strip. The probe also has been successfully served as the analysis and detection of HCHO in food and water.
研究领域:
分析化学
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生物医学
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环境科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Zhen Sun,Xueli Yang,Wenlu Liu,Yalin Zhang,Zheng Hu,Guofeng Pan,Yehong Cheng
Morphology control significantly improves the microstructure, increases the number of defects, tailors porosity, and optimizes the band gap of gas-sensing materials, profoundly affecting the adsorption and desorption capabilities for gas molecules. Herein, we prepared In(OH) 3 precursors via a hydrothermal method and rationally controlled the microstructure of In 2 O 3 by varying annealing temperatures (400°C, 500°C, 600°C). Characterizations revealed that the porous cubic In 2 O 3 -500 (500°C) exhibited superior properties, including more balanced grain size and crystallinity, superior pore structure, more oxygen vacancies and adsorbed oxygen, and a narrower band gap compared to the surface-dense cubic In 2 O 3 -400 (400°C) and the porous spherical In 2 O 3 -600 (600°C). Gas-sensing tests demonstrated that three sensors displayed exceptional selectivity towards formaldehyde (HCHO), with rapid response times (1 s) to 100 ppm HCHO. Notably, In 2 O 3 -500, operating at a lower temperature (175°C), achieved the highest response (R a /R g = 200), good humidity resistance, and the lowest detection limit (30 ppb). The gas-sensing performance at 60 RH% showed that In 2 O 3 -500 still exhibited the highest response (161) to 100 ppm HCHO at 175℃, a decrease of less than 20 %. This study offers insights into the cost-effective and facile fabrication of high-performance HCHO gas sensors based on In 2 O 3 materials.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF FISH DISEASES
·
2022
·Vol. 46
·期 3
·215-227
·
IF 2.58
Ziqing Zhong,Xiping Wu,Mindong Bai,Xiaodian Huang,Qilin Zheng,Chunxiang Ai
Cryptocaryon irritans causes one of the most serious diseases in various wild and cultured marine fish, leading to mass mortality and economic loss. In this study, hydroxyl radical (•OH) solution produced by strong ionization discharge combined with water jet cavitation effect was injected into orange-spotted grouper ( Epinephelus coioides ) aquaculture tanks for C. irritans control. The results showed that all C. irritans theronts were inactivated by •OH solution at concentrations of 0.5 mg/L within 2 min. •OH could induce alteration of shape, the absence of motility and macronucleus dispersion in theronts. A possible explanation was that the macronucleus of C. irritans might be damaged by •OH; as a result, its metabolism and life activities were disturbed. The •OH treatment increased the survival rate of E. coioides challenged with C. irritans from 64.7 ± 8.0% (mean ± SD) to 100% and reduced their infection intensity significantly. Stress response biomarkers such as malonaldehyde, glutathione, glutathione peroxidase, superoxide dismutase (SOD) and catalase levels in the gills of E. coioides at different time points were analysed. The SOD activity in the •OH group first decreased and then recovered to the initial level at the end of the experiment. The other stress response biomarkers had no significant difference from that in the uninfected control group after •OH treatment. Additionally, the gill of E. coioides in the •OH group exhibited slight and reversible transformation compared with the uninfected control group. Compared with •OH treatment, chlorine dioxide and formalin treatment reduced the survival rate, induced oxidative damage and changed the histological gill structure in E. coioides . In conclusion, •OH could be applied effectively to control C. irritans infection without affecting the normal physiological condition of E. coioides .
研究领域:
水产养殖学
·
寄生虫学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xueyan Chen,Shuo Hu,Xiaoxiao Qin,Min Chen,Jianghao Zhang,Xiaolei Bao,Changbin Zhang
Ag-based catalysts have been extensively investigated in HCHO oxidation on account of the low price of the Ag precursor and their considerable low-temperature activity. It is known that H2 pretreatment has a remarkable promotion effect on Pt- and Pd- catalysts for HCHO oxidation, whereas the effect of H2 reduction on Ag-based catalysts has been rarely reported, probably due to the coexistence of multiple states of Ag species resulting from the high Ag loading. Herein, we prepared a 1% Ag/Al2O3 (Ag/Al-fresh) catalyst with Ag species in a uniform state and then reduced Ag/Al-fresh with H2 at 600 °C to obtain the Ag/Al-600H2 catalyst. We observed that H2 reduction had a significant influence on the performance of Ag/Al2O3 nanocatalysts in HCHO oxidation. In a dry reaction atmosphere, Ag/Al-fresh and Ag/Al-600H2 exhibited comparable HCHO conversion levels, but Ag/Al-600H2 showed much higher CO2 selectivity than Ag/Al-fresh. The presence of water vapor severely suppressed the HCHO conversion of the Ag/Al-fresh catalyst, while Ag/Al-600H2 showed high water resistance, maintaining high HCHO conversion and CO2 selectivity at 35% RH. Characterization results showed that the Ag species on Ag/Al-fresh and Ag/Al-600H2 were single-atom cationic Ag and metallic Ag nanoparticles, respectively. It was revealed that the Ag0 nanoparticles were more conducive than single-atom Ag+ to formate decomposition, as well as O2 and H2O activation, thus accelerating the conversion of HCOO– and CO intermediates to CO2 and contributing to the higher activity and water resistance of the Ag/Al-600H2 catalyst.
研究领域:
催化化学
·
环境科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Wenjing Yuan,Chonggang Wang,Tao Qi,Yinhua Wan,Shuping Zhang,Yaoyao Wu,Kang Hu,Guan Peng,Baozhi Zhang,Shaoyuan Shi
In this study, electron-deficient boron and electron-rich nitrogen are designed as the B/N Lewis pair to capture HCHO, and in next step the adsorbed HCHO is degraded into CO 2 and H 2 O (mineralization efficiency 97 %) via the Fenton-like O 2 activation and generation singlet oxygen ( 1 O 2 ), superoxide radicals (•O 2 − ) and hydroxyl radicals (•OH) derived from the interaction between palladium nanoparticles and oxygen molecules. Experimental data and theoretical calculations reveal the optimal path as follows: HCHO + OH* (•OH) → HCHOOH* → HCOOH + OH* (•OH) → CHO 2 * + O* ( 1 O 2 and •O 2 − ) → CO 2 , which correspond to the lowest energy barrier for elementary reaction. This study demonstrates a strong catalytic HCHO oxidation process and a new insights into exploiting synergetic palladium-modulated and B/N Lewis pair-functionalized flocculent carbon fibres for room-temperature HCHO decomposition.
研究领域:
材料科学
·
环境科学
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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）