DIAMOND AND RELATED MATERIALS
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2023
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IF 4.1
Yin Zhang,Yanping Huang,Bingqun Lin,Zupeng Chen,Xinwu Xu,Mingzhu Pan
Photocatalytic degradation is an eco-friendly technology for volatile organic compound (VOC) removal, but searching for a highly efficient photocatalyst system remains a challenge. Here, a novel photocatalyst , ZnO/Ti 3 C 2 T X composite, was developed by the electrostatic deposition strategy, wherein Ti 3 C 2 T X nanosheets serve as a support to provide abundant surface-active sites for loading ZnO spheres and adsorbing VOC molecules. Furthermore, successive catalytic centers are formed to enlarge the photocatalytic reaction interface , thereby minimizing the photogenerated electron transfer distances. Moreover, a Schottky heterojunction was successfully formed between the ZnO spheres and Ti 3 C 2 T X nanosheets , which further suppressed the recombination of photogenerated electron–hole pairs. As a result, the ZnO/Ti 3 C 2 T X composite exhibited enhanced photocatalytic activity , universality and stability in VOCs degradation. The photodegradation efficiencies of formaldehyde, methyl alcohol and acetone were as high as 91 %, 84 % and 80 % by ZnO/Ti 3 C 2 T X composite, respectively. The pseudo-first-order kinetic constant of formaldehyde decomposition on ZnO/Ti 3 C 2 T X was 2.69 times greater than that on pristine ZnO. This work presents a novel photocatalyst system of ZnO/Ti 3 C 2 T X composite and provides an insight for the development of highly efficient photocatalysts for the degradation of VOCs.
研究领域:
材料科学
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环境科学
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高影响因子
Scientific Reports
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2025
·Vol. 15
·期 1
·1-11
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IF 3.9
Guan Sihui,Liu Chenxu,Ruan Meiying,Wang Rongqing,QingjingYe,Wan Hongjian,Zhou Guozhi,Guo Shangjing,Cheng Yuan,Yao Zhuping
This study aimed to identify and compare the flavor substances in mature tomato and pepper fruits using flavoromics based on GC×GC-TOF-MS. A total of 1560 volatile substances were identified, including 627 tomato specific substances and 534 pepper specific substances. Esters were identified as the distinguishing factor in the aroma profiles of the two. ROAV, an effective flavor evaluation criterion, can help identify the main contributors to flavor that can be detected by the taste buds. VOCs with ROAV > 1 are typically regarded as the key flavor contributors. Interestingly, it was found that tomato and pepper shared three common VOCs (2-nonenal, (E)-; 2-octenal, (E)-; and furan, 2-pentyl-.), which exhibited higher ROAV in both. Except for the three common VOCs, heptanal; 2-dodecenal, (E)-; 1-octen-3-one; 2-undecanone in tomato and pyrazine, 2-methoxy-3-(2-methylpropyl)- in pepper were identified to be contributive to their corresponding aromatic flavor (ROVA > 1), respectively. The contents of 138 volatile metabolites differ between tomato and pepper. Among them, acetoin, dodecanal and 1-decanol demonstrated highest fold change (Log 2 FC > 10). The flavor wheel shows the most obvious flavor characteristic of both tomato and pepper is sweet flavor. In addition, green, fruity, herbal, woody and apple flavors are prominent in pepper, while waxy, citrus and fatty flavors are prominent in tomato.
研究领域:
食品科学
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植物学
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分析化学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Fang Dong,Yu Meng,Weitong Ling,Weigao Han,Weiliang Han,Xiaona Li,Zhicheng Tang
Development of low-cost noble Pt-based catalyst with superior catalytic performance is a challenge to achieve its application in VOCs catalytic oxidation. Although the single atom provides a strategy to design and develop highly efficient heterogeneous catalysts that simultaneously maximizes the utilization of precious metal atoms, the stability of single atom catalysts is not satisfactory as a result of its high atomic surface energy. Here we construct a Pt 1 @CeO 2 single atom catalyst (SAC) with excellent catalytic activity for benzene catalytic combustion (T 90 = 212 °C) and low precious metal Pt loading, and even displaying an outstanding thermal stability and water resistance under the harsh conditions of 30,000 mL/g/h and 2000 ppm benzene. This Pt 1 @CeO 2 catalyst was obtained by in situ domain limited encapsulation of Pt species in Ce-MOFs nanocages during the solvothermal reaction process. It is observed that lots of oxygen vacancies were created by the dislocation and phase transition of CeO 2 to provide abundant sites for anchoring single atomic Pt, which can be localized and anchored firmly to oxygen vacancies, thus forming the highly stable Pt single atom. The atomically dispersed Pt is capable of improving the catalytic activity by forming Pt-O band. The good water resistance may be ascribed to the confined Pt single atom into oxygen vacancies of CeO 2 support to form strong metal-support interaction (SMSI), and the PtO x nanoparticles would be easy to aggregate deactivation under water vapor conditions. It is a simple and universal strategy to prepare Pt SAC via the inherently confined space of MOFs nanocages formed by coordination of organic ligands and metal ions, which benefits from the functional modification of ethylene glycol in MOFs self-assembly reaction.
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 Cleaner Production
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2026
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IF 10.7
Shuangyong Su,Yuxiang Hou,Hangyu Duan,Tianyi Li,Jin Chen,Hongpeng Jia
Monolithic inverse catalysts were fabricated by optimizing treatment conditions. • O V generation could be significantly promoted by optimizing inverse structure. • Alternating magnetic field could enhance charge transfer across inverse interface. • Magnetocatalytic oxidation required lower temperatures than traditional heating. • Magnetocatalytic purification encompassed demands of intermittent VOCs source. Catalytic oxidation is widely employed in volatile organic compounds (VOCs) degradation. The continuous optimization of catalytic oxidation technology encompasses the materials design and heat sources innovations. Herein, we found that adjusting the temperature and H 2 treatment could regulate inverse structure of CoO x /Ni foam (CoO x /NF) monolithic catalysts, resulting in enhancement of oxygen vacancies generation. This promotional effect could be further amplified by electromagnetic induction heating (EMIH), which was probably ascribed to the acceleration of charge transfer across the inverse interface induced by alternating magnetic field. Consequently, CoO x /NF-300R, as an inverse catalyst synthesized under optimized conditions, could exhibit superior activity for catalytic oxidation of VOCs including benzene, toluene and o -xylene. The demanded temperature for removal of toluene in EMIH mode was reduced by approximately 50°C compared to that in traditional heating mode. Furthermore, the VOCs catalytic oxidation system composed of CoO x /NF-300R and electromagnetic induction could meet the requirements for rapid and efficient purification of multi-species and intermittent pollution sources. Download: Download high-res image (375KB) Download: Download full-size image
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高影响因子
FUEL
·
2025
·
IF 7.5
Jie Liu,Lin Yang,Wenju Jiang,Zhongde Dai,Lu Yao,Junfeng Zheng,Xingjian Wang
In this study, the Cu/C@Zeolite catalysts with carbon-zeolite bifunctional support was developed by using the zeolite-induced one-pot homogeneous synthesis of CuBTC composite (CuBTC@Zeolite). Three different zeolites (ZSM-5, 13X, NaY) and the activation conditions were discussed. Originating from the defective structure of CuBTC in the composite and its interactivity with the zeolite, compared to Cu/C, the Cu/C@zeolite catalysts had the hierarchical pore system, a higher content of oxygen vacancies, stronger redox properties, and more active Cu sites with smaller particle sizes and more Cu + /Cu 2+ coexisting valence states, in synergy with acid sites, all of these contributing to the improved catalytic activity for VOCs oxidation removal. The activity of toluene catalytic oxidation indicated by T 90 was in the order of Cu/C@NaY (268.5 °C) > Cu/C@ZSM-5 (280.0 °C) > Cu/C@13X (287.0 °C) > Cu/C (320.0 °C). They also performed a better activity for acetone and ethyl acetate oxidation, obtaining the lowest T 90 at 217.0 and 231.5 °C respectively when the Cu/C@NaY used. Moreover, the Cu/C@NaY and Cu/C@ZSM-5 performed good water resistance and stability, suggesting the potential in practical application scenarios. These findings underscored the potential of Cu/C@Zeolite catalysts for addressing complex VOCs in simultaneous catalytic oxidation.
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
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Wenxuan Zhao,Ying Xu,Wenna Liu,Xiang Wang,Zhaoyou Zhu,Yinglong Wang,Peizhe Cui,Guoxuan Li
Imidazolium-based ionic liquids (ILs) were explored for the first time to capture C4 alcohol aldehyde isomer VOCs. The suitable IL was screened with viscosity, solubility, and selectivity as indicators by COSMO-SAC model. The absorption experiment showed that [BMIM][TFO] had excellent absorption capacity compared with [EMIM][TFO], and the average absorption rate was increased by 3.51 %. Quantum chemical analysis and molecular dynamics simulations have clarified the dual interaction mechanism of the process, that is, the cation binds to the alcohol/aldehyde through van der Waals force and hydrogen bond, while the anion interacts with the aldehyde through van der Waals force. The process simulation shows that using [BMIM][TFO] can reduce the amount of absorbent by 26.26 % compared with [EMIM][TFO] absorbent. This work provides a theoretical basis for the design and process optimization of C4 alcohol and aldehyde isomers VOCs capture absorbents and expands the application range of ILs in chemical waste gas treatment.
研究领域:
化学工程
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环境科学
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物理化学
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材料科学
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DOI
高影响因子
iScience
·
2023
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IF 5.8
Xiai Zhang,Wenquan Zhang,Xinwei Zhang,Jun Li,Tong Wang,Qikui Fan,Hao Zhu,Zhimao Yang,Chuncai Kong
Peroxymonosulfate (PMS)-based advanced oxidation processes in liquid phase systems can actively degrade toluene. In this work, the catechol structural surfactant was introduced to synthesize the dispersed and homogeneous CoFe 2 O 4 nanospheres and embedded into MoS 2 nanoflowers to form magnetically separable heterojunction catalysts. The innovative approach effectively mitigated the traditionally low reduction efficiency of transition metal ions during the heterogeneous activation process. In CoFe 2 O 4 /MoS 2 /PMS system, the toluene removal efficiency remained 95% within 2 h. The contribution of SO 4 ⋅- , ·O 2 - , ·OH, and 1 O 2 was revealed by radical quenching experiment and electron paramagnetic resonance spectroscopy. The results illustrated that MoS 2 offers ample reduction sites for facilitating PMS activation via Fe 3+ /Fe 2+ redox interactions. Furthermore, an investigation into the toluene degradation pathway within the CoFe 2 O 4 /MoS 2 /PMS system revealed its capability to suppress the formation of toxic byproducts. This ambient-temperature liquid-phase method presented promising route for the removal of industrial volatile organic pollutants.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
PubMed
高影响因子
Journal of Hazardous Materials Advances
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2022
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IF 0
Zhuo Chen,Qiwei Chen,Ying Xu,Jinhan Mo
PAEs usually adsorb on indoor surfaces to form organic films, which could be more hazardous after enriching VOCs. Two typical PAEs, DnBP and DEHP, in the film phase, were chosen to explore the enrichment capacity of gaseous toluene, hexanol, and benzyl alcohol in this study. Exposed to gaseous VOCs less than 250 ppb, film-phase DnBP and DEHP could capture benzyl alcohol significantly and hexanol slightly from the air, respectively, while toluene was hardly absorbed in the films. Henry's law constants and partition coefficients ( K ) of VOCs in DnBP or DEHP films were derived, supposing films as dilute solution systems. The K value of VOC in DnBP or DEHP films was 1∼2 orders larger than the octanol-air partition coefficient ( K oa ), indicating that the surface film composition greatly influences VOC adsorption. Benzyl alcohol was the largest VOC component in surface films, agreeing well with the molecular dynamics simulation results. The hydroxyl and phenyl groups of benzyl alcohol molecules may be key factors in VOC enrichment. They form hydrogen bonds with the ester group and π-π stacking interaction with the phenyl group of DnBP or DEHP molecules, respectively. After enriching VOCs, film-phase PAEs could evoke combined exposure risks to human beings.
研究领域:
环境科学
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化学
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DOI
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Wenjia Yang,Wen Cui,Lin Yang,Guo Zhang,Xiaofang Li,Yu Shen,Fan Dong,Yanjuan Sun
Considering that the structural differences could dictate the photocatalytic efficiency, the cubic SrTiO 3 (STO) and tetragonal CaTiO 3 (CTO) were developed to illustrate the structure–activity relationship. The STO with cubic structure demonstrates much higher photocatalytic toluene removal efficiency ( ca. 80.0%) than that of CTO ( ca. 20.0%), which can be ascribed to boosted formation of reactive oxygen species (ROS), increased selectivity of intermediates, and promoted ring-opening and mineralization rate. Combining theoretical simulation and experimental characterization, the results reveal that the O 2 and H 2 O molecules tend to be adsorbed on the cubic STO, which boosts the formation of ROS. Also, highly selective formation of intermediate (benzoic acid) has been realized to accelerate ring-open and mineralization process as evidenced by the smooth conversion of STO as indicated by Gibbs free energy. This work provides new perspectives on the understanding of relationship between intrinsic structure and photocatalytic performance.
研究领域:
材料科学
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环境科学
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催化
·
化学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
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IF 4.65
Bin Tong,Gang Meng,Zanhong Deng,Jingjing Gao,Hongyu Liu,Tiantian Dai,Shimao Wang,Jingzhen Shao,Ruhua Tao,Fantai Kong,Wei Tong,Xuan Luo,Xiaodong Fang
Identifying the defect type which closely correlates with gas/metal oxide semiconductor (MOS) interfacial charge exchange is of utmost importance for rationally designing high performance MOS gas sensors, which are essential for the emerging sensing electronics for assessing the personal health and environment pollution. Herein, we report the sensing performance of p-type NiO toward volatile organic compounds (VOCs) molecules could be drastically improved by Sc dopant . At an optimal doping ratio of 7.4 at.%, the sensor response to 100 ppm acetone was boosted from 8.2 (pure NiO) to 109.4, with a low detection limit of 10 ppb. Comprehensive defect characterizations indicate surface unsaturated oxygen vacancy (V O ) defects act as active sites that facilitate the interfacial charge exchange at elevated temperatures. Our work highlights that abundant V O defects induced by aliovalent Sc dopant play an important role in boosting the sensitivity of p-type NiO toward VOCs, and provide valuable guidance in designing high performance p-type MOS sensors.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Zepeng Rao,Guanhong Lu,Asad Mahmood,Gansheng Shi,Xiaofeng Xie,Jing Sun
The poor efficiency and stability of photocatalysts are the fundamental issues to be addressed for photodegrading VOCs in practical applications. Herein, 0.5 wt%rGO/0.5 mol%Er 3+ -TiO 2 (0.5rGO/0.5 ET) exhibited the excellent performance and a remarkable durability towards gaseous VOC ( o -xylene), while pure TiO 2 (PT) and 0.5 mol%Er 3+ -TiO 2 (0.5 ET) showed poor catalytic activity and deactivation after 60 min. The results suggested that intermediates accumulation was primarily responsible for the deactivation of PT and 0.5 ET. In contrast, the activity of 0.5rGO/0.5 ET was not decreased although more intermediates were generated compared with other samples. The experiments revealed that rGO provide more adsorption sites for the intermediates, which helped 0.5rGO/0.5 ET resist the deactivation even after photodegradation of 10 h and 4 cycles. Therefore, rGO played a vital role in keeping the stable activity of the composites. This study is helpful to understand the deactivation/activation mechanism of photocatalysts and provided a promising strategy to make catalyst in activation for industrial application.
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
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Zepeng Rao,Guanhong Lu,Lu Chen,Asad Mahmood,Gansheng Shi,Zixia Tang,Xiaofeng Xie,Jing Sun
To identify the distinctive role of reactive oxygen species (ROS) and trace the intermediates not only help to decompose the pollutants in high efficiency but also for avoiding more harmful intermediates formed. Here, we developed a new method to generate different ROSs by controlling the atmosphere to distinguish their role in the degradation of flowing gas-phase VOCs, including o -xylene, styrene, and acetaldehyde. This method is in good agreement with the traditional sacrificial agent capture experiment. The results show that • OH radicals play a dominant role in the degradation of o -xylene and styrene, while • O 2 − radicals primarily take part in the acetaldehyde degradation. Additionally, we distinguish the role of holes, • OH and • O 2 − played during the VOCs photo-oxidation through the radical trapping, in situ DRIFTS, and GC-MS analysis. Under the attack of • O 2 − radicals, aromatic VOCs were photo-oxidized to intermediates containing benzene rings and ketones (i.e., toluene and butanone), while carbon chain compounds (i.e., 3-methylfuran and ethanol) tend to form under the action of • OH and holes. This can be associated with the different reaction paths initiated by ROS. For acetaldehyde removal, •O 2 − species facilitate the formation of acids (i.e., acetic acid) while the •OH species and holes lead to the production of ketones (i.e., acetone). This work provides deep understanding on the role of various ROS in the photocatalytic oxidation of VOCs, which can guide the design of efficient photocatalysts, selective formation of intermediates to be easily decomposed or as raw materials for further application.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
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