Analytical Methods
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2024
·
IF 2.7
Shengji Wu,Guiyuan Hu,Yutao Shen,Rui Tang,Fan Yang,Lei Che,Wei Yang
Determination of mercury species over solid waste from natural gas processing plants is a prerequisite for solid waste decontamination and mercury recycling. The temperature-programmed decomposition and desorption method (TPDD) is a promising technique to determine the mercury species over solid waste. Mercury species over solid wastes with complex components and similar desorption temperature, however, cannot always be determined using only the TPDD method. In the present study, the EPA 3200 method was applied to optimize the TPDD process for speciation of the mercury compound over solid wastes collected from a natural gas processing plant, including four spent adsorbents and three sludges. The mercury species with similar desorption temperatures over solid wastes were completely separated by EPA 3200 method optimized TPDD process. The mercury species over spent adsorbents and sludges could be determined based on the fingerprints of the mercury compounds. The mercury compounds over spent adsorbent were specified to be Hg0 and/or M-Hg amalgam, HgS(Black) and HgO(Red), of which HgS(Black) was the primary mercury compound. However, the mercury species over sludge were analyzed to be Hg0 and/or M-Hg amalgam, HgCl2(minor), HgS(Black), HgO(Yellow) and HgS(Red). The mercury recovery rates of solid wastes ranged from 73% to 120%. With the above results, it was considered that the EPA 3200 method optimized TPDD process was a promising method to specify and semi-quantify the mercury compounds in solid waste.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Bo Ran,Ping Hu,Jun Sun,Jialu Fang,Qihua Sun,Juqi Wang,Yuqing Zhu,Ning Tian,Zhaofeng Wu,Haiming Duan
In this study, biomass-derived carbon material obtained from Lyocell fibers was first utilized as a gas sensor. The impacts of varying pyrolytic carbonization temperatures and pregrinding treatments on the structure, surface morphology, elemental composition, and gas sensitivity of the samples were thoroughly examined. The CL-500 sensor can realize rapid detection of trimethylamine with a high response (12.79k%, 500 ppm) and high selectivity at room temperature; the response/recovery times are 10 s and 2 s, respectively, and the theoretical detection limit is 3.96 ppm. Moreover, after four months, the response of the CL-500 sensor to trimethylamine fluctuated by less than 9.7 % compared with that of the fresh sensor, indicating good stability. It also shows good recovery after seven consecutive response-recovery cycles. Additionally, the CL-500 sensor has promising applications in real-life fish freshness monitoring. Theoretical calculations indicate that the introduction of trace amounts of Na enhances the sensing performance of this sensor for target gases. This study serves as a guide for developing cost-effective, high-performance gas sensors, promoting the efficient and high-value utilization of biomass waste.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yan-nan Wang,Liyun Qin,Zhenyu Yuan,Jin Li,Fanli Meng
An optical fiber acetone gas sensor based on N-CQDs@In 2 O 3 porous ordered thin film is proposed. The probe adopts the hollow malposition structure (HMS) to excite the evanescent field on the surface of hollow-core fiber (HCF). N-CQDs@In 2 O 3 porous and ordered thin film was formed on the surface of optical fiber after calcining polystyrene (PS) microspheres at high temperature. The experimental results reveal the ultraviolet (UV) sensitization function for the proposed sensor at room temperature . The enhanced sensitivity is 7.1 pm/ppm, which is ∼5.9 times of the spiritual density of unsensitized sensor. In addition, the sensor has a limit of detection (LOD) of 500 ppb and excellent time response characteristics (response time 6.2 s and recovery time 7.1 s). The sensitization mechanism of N-CQDs to In 2 O 3 is explained by the results of the universal density function (DFT). The frontier electron orbital studies show that N-CQDs@In 2 O 3 has more abundant electron clouds. The good moisture resistance enables its stable performance in humid environment. UV sensitization is an effective way to improve the sensitivity of optical fiber gas sensor, which is of great significance for detecting the acetone gas with ultra-low concentration.
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ATMOSPHERIC ENVIRONMENT
·
2024
·
IF 4.2
Cici Fan,Huijie Yan,Weigang Wang,Zheng Sun,Maofa Ge
Aldehydes are one of the most important oxygenated volatile organic compounds in the atmosphere, contributing to atmospheric radicals such as HO 2 and RO 2 , which play a pivotal role in atmospheric chemistry and the oxidative capacity of the atmosphere. The kinetics, gas-phase products, and SOA formation of pentanal and n-hexanal initiated by Br atoms were studied in this work. The reaction rate constants of n-pentanal and n-hexanal reacting with Br atoms were determined to be (1.77 ± 0.25) × 10 −11 cm 3 molecule −1 s −1 and (2.07 ± 0.29) × 10 −11 cm 3 molecule −1 s −1 at 298 K and 760 Torr, respectively. Key gas-phase products, including smaller aldehydes, carboxylic acids, and alcohols, are known to contribute to atmospheric reactivity and have potential implications for air quality by promoting the formation of secondary pollutants and influencing the oxidative capacity of the atmosphere. The SOA yields were (5.24 ± 0.10)% and (6.00 ± 1.20)% for n-pentanal and n-hexanal, respectively, higher than the SOA yields of the aldehydes reaction initiated by OH radicals. The higher SOA yields observed from Br atoms oxidation compared to OH radical oxidation highlight the necessity to re-evaluate the role of halogen chemistry in atmospheric processes, particularly in regions where halogen compounds are prevalent. This research enhances our understanding of the atmospheric fate of aldehydes and highlights the importance of considering halogen-driven oxidation pathways in atmospheric models.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Ying Pu,Gaoying Wu,Yue Wang,Xiaobing Wu,Na Chu,Raymond Jianxiong Zeng,Yong Jiang
Electrochemical CO 2 reduction (CO 2 RR), fueled by clean and renewable energy, presents a promising method for utilizing CO 2 effectively. The electrocatalytic reduction of CO 2 to CO using a gas diffusion electrode (GDE) has shown great potential for industrial applications due to its high reaction rate and selectivity. However, guaranteeing its long-term stability still poses a significant challenge. In this study, we conducted a comprehensive investigation into various strategies to enhance the stability of the GDE. These strategies involved modifying the structure of the substrate, such as the gas diffusion layer (GDL) and the back side of the GDL (macroporous layer side). Additionally, we explored modifications to the catalyst layer (CL) and the front of the CL. To address these stability concerns, we proposed a practical approach that involved surface coating using carbon black in combination with in situ cyclic voltammetry (CV) cycles on Ag/Ag 300 /polytetrafluoroethylene (PTFE). The partial Faradaic efficiency exceeded 80 % within a span of 70 h. Electron microscopy and electrochemical characterization revealed that the implementation of in situ CV led to a reduction in catalyst particle size and the formation of a porous surface structure. By enhancing the stability of the GDE, this research opens up possibilities for the advancement of hybrid systems that focus on the production and utilization of syngas.
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RARE METALS
·
2025
·
IF 11
Guo Jing,Mu Zhi-Mei,Yu Jing,Sun Guan-Liang,Hou Lin-Rui,Qiao Xue-Zhi,Yang Shi-Kuan,Zhang Xing-Shuang,Xu Guan-Chen,Liu Guo-An,Yang Fan,Yuan Chang-Zhou,Liang Xiu
Metal–organic framework materials exhibit considerable potential as molecularly selective surface-enhanced Raman spectroscopy (SERS) substrates because of their microporous structures, which enrich small molecules while excluding larger ones. In this study, we develop a template-assisted chemical-etching strategy to prepare layered tuneable SERS substrates based on hierarchical porous zeolitic imidazolate framework-67 (HP-ZIF-67) with a rhombic dodecahedral structure. The synergistic SERS enhancement mechanisms of HP-ZIF-67, which combine electromagnetic (EM) and chemical (CM) effects, were systematically studied through numerical simulations and experiments. Calculations revealed that under 633-nm laser excitation, the contributions of the EM and CM effects to the total SERS enhancement factor of HP-ZIF-67 were 60% and 40%, respectively. The hierarchical porous structure enhanced the fluid-flow flux over the microporous ZIF-67 because the increased pore radius reduced the viscous resistance and facilitated rapid molecular transport through the interconnected macro-meso-channels. Precise modulation of the CM and EM effects, combined with enhanced mass transfer, facilitated the development of HP-ZIF-67 and HP-ZIF-67@Au as efficient SERS sensors. An investigation of the relationship between pore-size distribution and EM effects revealed the pivotal role of light confinement by whispering-gallery-mode microcavities in enhancing the SERS performance. The optimised HP-ZIF-67@Au composites functioned as flexible and highly sensitive in situ SERS sensors for gases and liquids, including volatile organic-compound gas and liquid-pesticide residues. This study introduces a novel design concept and provides a robust theoretical foundation for the future development of exhaled-breath point-of-care diagnostic devices and sweat-based wearable biomedical sensors. Graphical abstract
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Mengqi Xiao,Jibao Zhang,Yang Li,Yan Li,Xuejian Liu,Xiaolin Wang,Zhenyuan Yin
Hydrate-based H 2 storage has emerged as a promising solution for offshore wind-to-hydrogen applications. Seawater is widely accessible on offshore platforms and can be directly used as a hydrate former. However, effects of salt in seawater on the kinetics of hydrogen hydrate are less understood and warrants investigation. This study systematically examines the influence of NaCl on the H 2 hydrates formation in the presence of a thermodynamic promoter, 1,3-dioxolane (DIOX). Effects of NaCl on the thermodynamics, kinetics, and morphology of H 2 -DIOX hydrates were investigated. The thermodynamic inhibition on DIOX hydrates is more pronounced than that on H 2 -DIOX hydrates in simulated seawater, resulting in a slurry-like hydrate morphology that improves gas-liquid contact. H 2 final gas uptake achieved in simulated seawater is seven-fold that of pure water with H 2 only occupying 5 12 cages of sII hydrate. Our study provides insights into the direct use of seawater for offshore hydrate-based H 2 storage.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Linna Chang,Yan Qin,Zhou Shen,Di Wu,Xiaoping Yin,Leyong Zeng
Reactive oxygen species (ROS) are critical in tumor therapy, but the antioxidant tumor microenvironment severely restricts the ROS-modulated antitumor efficacy. In this study, a photothermal-promoted cascade nanozyme (MnO 2 @Lap/PAH/L-Arg@Au) was constructed by modifying β-lapachone (β-Lap), poly(allylamine hydrochloride) (PAH), and L-arginine (L-Arg) and depositing gold nanoparticles (AuNPs) on hollow manganese dioxide (MnO 2 ), enhancing ROS-modulated catalytic/gas combination therapy. The pH- and glutathione-responsive hollow MnO 2 degradation released β-Lap to elevate the generation of hydrogen peroxide (H 2 O 2 ), which substantially activated and AuNPs-mediated hydroxyl radical (·OH) generation. Moreover, H 2 O 2 /·OH induces L-Arg to produce highly toxic nitric oxide (NO), and the Au nanoshell with high photothermal conversion efficiency (38.6 %) further enhanced ROS/NO generation. By reducing adenosine triphosphate production and inducing mitochondrial dysfunction, the combination of photothermal/catalytic/gas therapy greatly triggered cell apoptosis and inhibited tumor growth. Thus, the developed MnO 2 @Lap/PAH/L-Arg@Au nanozyme established a dynamic cascade pathway of “ROS-driven NO release”, and achieved photothermal-promoted catalytic/gas therapy.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Fang Wang,Jinchi Mu,Zhonghai Zhang,Jixin Dong,Jinyao Han,Ruiyang Zhang,Ying Zhou
CO 2 capture is one of the most straightforward ways for solving the greenhouse gas effects. Hydrate-based CO 2 capture from flue gas has been considered as an emerging green technology owing to its low energy consumption, cost-effectiveness, and environmental benefits. In this study, the hydrophilic functionalized multi-walled carbon nanotubes (FMWCNTs) were modified and applied for CO 2 capture from flue gas by combining the dynamic experiments towards CO 2 hydrate formation and theoretical simulations. Firstly, the selective adsorption towards CO 2 in the simulated flue gas was greatly improved by regulating the hydrophilic functional groups, especially for COOH groups on the surface. Particularly, FMWCNTs induced a rapid accumulation of CO 2 , which largely shortened the hydrate nucleation time to 13 min, reducing by 59.4 % compared to the pristine THF system. This further promoted the formation of CO 2 hydrate crystals and enhanced the hydration rate and gas consumption. As a result, the CO 2 storage capacity achieved 6.48 mmol/(mol·H 2 O), with the highest separation efficiency of 76.3 %, which increased by 23.6 % and 22.7 % than that of SDS-based traditional accelerators. Particularly, the low concentration of 0.01 wt% FMWCNTs still achieved a high separation efficiency of 73.4 %, showing a great potential as kinetic accelerators with low dosage. The present study could provide novel insights into the development of modified carbon nanotubes as the kinetic accelerators for CO 2 capture.
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SENSORS
·
2025
·Vol. 25
·期 14
·4480
·
IF 3.5
Yinzhong Liu,Xiaoshun Wei,Yun Guo,Lingchao Wang,Hui Guo,Qingjie Wang,Yiyu Qiao,Xiaotao Zhu,Xuechun Yang,Lingli Cheng,Zheng Jiao
Volatile organic compounds (VOCs) are presently posing a rather considerable threat to both human health and environmental sustainability. Among these, n-butanol is commonly identified as bringing potential hazards to environmental integrity and individual health. This study presents the creation of a highly sensitive n-butanol gas sensor utilizing cobalt-doped zinc oxide (ZnO) derived from a metal–organic framework (MOF). A series of x-Co/MOF-ZnO (x = 1, 3, 5, 7 wt%) nanomaterials with varying Co ratios were generated using the homogeneous co-precipitation method and assessed for their gas-sensing performances under a low operating temperature (191 °C) and UV excitation (220 mW/cm2). These findings demonstrated that the 5-Co/MOF-ZnO sensor presented the highest oxygen vacancy (Ov) concentration and the largest specific surface area (SSA), representing the optimal reactivity, selectivity, and durability for n-butanol detection. Regarding the sensor’s response to 100 ppm n-butanol under UV excitation, it achieved a value of 1259.06, 9.80 times greater than that of pure MOF-ZnO (128.56) and 2.07 times higher than that in darkness (608.38). Additionally, under UV illumination, the sensor achieved a rapid response time (11 s) and recovery rate (23 s). As a strategy to transform the functionality of ZnO-based sensors for n-butanol gas detection, this study also investigated potential possible redox reactions occurring during the detection process.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhihua Zhao,Shuhan Chen,Qingsheng Shi,Chao Qiu,Lan Wu,Xinhao Zhang,Peijuan Wu,Longqi Yao
People pay more and more attention to their own health and environmental safety, which makes the monitoring and treatment of harmful amines such as triethylamine (TEA) emitted in the industrial process increasingly critical. In order to address this issue, we focus on the heterostructure construction of two-dimensional rhenium disulfide (ReS 2 ) and acid-functionalized carbon nanotubes (f-MWCNTs), using their unique electronic properties and high specific surface area for triethylamine gas detection. The findings demonstrated that, at room temperature (25°C), the ReS 2 /f-MWCNTs sensor's response to 100 ppm TEA reached 63 %. Under the same environmental conditions (25℃), the response value of the ReS 2 sensor to 100 ppm TEA is 6 %, and the sensing performance is improved by more than 10 times. In addition, the sensor has fast response recovery (73 s/46 s) and good repeatability and stability. Based on this research, we designed a simple detection device, providing a direction for the practical detection application of TEA sensors.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Yanghang Liu,Lizhi Wang,Zirun Zhan,Yu Jiang,Xun Zhang,Yunhe Li,Xin Zhong,Dan Yu,Wei Wang
Real-time visual detection of ammonia (NH₃) is crucial for environmental safety and food quality, yet traditional sensors often suffer from slow response, poor selectivity, and limited adaptability. Here, we innovatively report an ammonium alginate (AL) and cellulose nanofiber-based colorimetric aerogel (APPC aerogel) with a sea anemone-inspired structure for rapid, sensitive, and reversible NH₃ detection. The aerogel is prepared by embedding a sulfonated indole photoacid (PMU H) into a matrix of AL, cellulose nanofibers (CNF), and phytic acid (PA), cast into a 3D-printed template, and directionally frozen to form an ordered porous bionic structure. Upon NH₃ exposure, PMU-H undergoes fast, reversible proton transfer and enol-keto tautomerization, producing a color change from yellow to purplish-red within 5 s. The aerogel shows a detection limit of 0.65 ppm, a linear range of 1–250 ppm, and maintains performance over 50 cycles. FTIR and DFT analyses reveal the sensing mechanism. The material remains stable under humidity, temperature variations, and complex gases, enabling effective visual monitoring of NH₃ during seafood spoilage and offering promise for food packaging, environmental monitoring, and safety applications.
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