MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Yan Qian,Haibang Zhang,Yan Xiong,Yinzuo Wu,Ziyue Fu,Pingchun Guo,Hedong Jiang,Jiake Li,Yanxiang Wang,Shijin Yu,Hua Zhu
The detection of low concentration hydrogen sulfide (H 2 S) gas is of paramount importance for environmental safety and human health, given its colorless, toxic, and flammable nature. In this study, heterostructure material composed of SnO 2 nanorods modified with NiO nanosheets were synthesized, which significantly improved the detection performance of the sensor for hydrogen sulfide (H 2 S) gas at low temperatures by combining the interaction between oxygen vacancies and built-in electric fields. The formation of heterojunctions was verified using X-ray diffraction (XRD) and transmission electron microscopy (TEM), and the existence of oxygen vacancies was further confirmed through electron paramagnetic resonance (EPR) spectroscopy. The heterojunction sensor, when modified with 3 mol% NiO, exhibited an exceptional response value of 386 towards 10 ppm H 2 S at 125 °C, with a rapid response time of 6 s, surpassing that of the pristine SnO 2 sensor. This superior performance can be attributed to the synergistic effect of oxygen vacancies between SnO 2 and NiO, along with the inherent electric field present in the heterojunction. The study showcases the remarkable selectivity and long-term stability of this sensor in detecting hydrogen sulfide gas, offering innovative insights for the advancement of low-temperature and highly sensitive H 2 S gas sensors.
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高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 3.8
Shuling Shi,Peng Tang,Xiang Zhang,Guijing Chen,Chunyan Yang,Di Zhang,Fengming Li,Mengting Zhu,Ping Yang,Baicang Liu
Shale gas flowback and produced water (SGFPW) pose significant challenges to biotechnology due to their high salinity. In this study, we explored a novel method utilizing an amphiphilic copolymer of methyl methacrylate and acrylamide (p(MMA-AAM)) and powdered activated carbon (PAC) to modify poly(ether sulfone) (PES). We prepared a series of monoliths for microorganism immobilization using both thermal-induced phase separation and non-solvent-induced phase separation. Characterization of the monoliths via fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), nitrogen adsorption-desorption analysis revealed improved hydrophilicity in the p(MMA-AAM)-modified monoliths and increased specific surface area (SSA) in monoliths with PAC addition. Particularly, the highest SSA was observed for the 0.5 g PAC (0.5-PAC/PES) monolith at 235.19 m 2 /g. Wastewater treatment experiments demonstrated that the 0.5-PAC/PES system exhibited superior pollutant removal performance, and it achieved nearly 100 % removal of NO 3 - and total nitrogen (TN) in simulated SGFPW. Besides, the removal rates of TN and total organic carbon (TOC) in actual SGFPW by the 0.5-PAC/PES system were 1.5 times and 1.3 times higher, respectively, than those achieved with suspended microorganisms. After 96 h biological treatment, the extracellular polymeric substances (EPS) content of 0.5-PAC/PES was highest, showing its positive role in enhancing microbial activity. This work introduces a new approach to immobilize microorganisms, enhancing biological activity for SGFPW treatment under high salinity conditions.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2024
·
IF 1.6
Tingting Ge,Hui Guo,Yuchao Li,Jinguo Hao,Yanxia Zheng,Lixi Yang,Haofei Huang,Ming Wang,Cuncun Zuo
Effects of trace oxygen on iron sulphides-supported catalysts (FeS x /γ-Al 2 O 3 ) were evaluated through smelter off-gas reduction process for sulphur synthesis. Catalytic performance was evaluated under different oxygen content conditions. The properties of fresh and used catalysts were investigated by means of X-ray diffraction (XRD), thermogravimetry-differential thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS), and elemental analysis and relationships of active phases and activity were analyzed. The relationship between different active crystal crystals (FeS x , FeS 2 , Fe, FeO, γ-Fe 2 O 3 ) and SO 2 /O 2 adsorption and conversion was investigated. The mechanism of oxygen influence on the FeS x /γ-Al 2 O 3 surface was given and the lifetime of the catalyst in the reaction atmosphere close to real smelter off-gas after dust and oxygen removal steps containing trace oxygen (0.5 O 2 v/v.%) was explored.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yong Wang,Xuanyu Zhao,Shaoxiong Han,Yongzhen Wang
The development of efficient technology for natural gas separation in industrial processes has become imperative. In this regard, the exploration of novel and effective adsorbents has gained significant attention. One promising approach is the metal regulation of metal–organic frameworks (MOFs), particularly heterometallic MOFs, which offer greater potential for gas separation due to their diverse composition. This study presents the synthesis of a series of iron- and vanadium-based heterometallic MOFs (MIL-126), featuring interpenetrated structures, and investigates their adsorption performance for methane (CH4), ethane (C2H6), and propane (C3H8). Experimental results reveal that the choice of metal combinations within the MOF framework significantly influences the adsorption performance of MIL-126. Notably, heterometallic MIL-126(Fe/Ni) exhibits a stronger binding affinity for C3H8, with an impressive uptake of 177 cm3/g. The C3H8/CH4 ideal adsorbed solution theory selectivity of MIL-126(Fe/Ni) surpasses that of MIL-126(Fe) by a factor of 7, reaching a value of 853, second only to the highest reported value. Furthermore, MIL-126(Fe/Ni) exhibits remarkable potential for the recovery of pure CH4 from the equimolar C3H8/CH4 mixture, with the amount of pure CH4 approaching the maximum reported value for MOFs. Insights from isosteric heat at zero loading and Henry’s coefficients indicate that the transformation of metal types leads to a change in the interaction energy between C3H8 and the framework. Furthermore, breakthrough experiments validate the effective separation capability of MIL-126(Fe/Ni) for CH4/C2H6/C3H8 mixtures. These findings underscore the remarkable potential of heterometallic MOFs in constructing a wide range of new MOFs with tailorable properties, thereby enhancing their gas separation performance.
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PubMed
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2024
·
IF 4
Zuolong Yu,Beizhen Hu,Yao Chen,Chaoqun Huang,Chao Han,Yan Shen
A gas chromatography-tandem mass spectrometry (GC − MS/MS) method was established for accurately determining penicillic acid in cereals. The cereal samples were extracted using acidified acetonitrile, purified by solid-phase extraction, and derived using N,O-bis(trimethylsilyl) acetamide for GC − MS/MS analysis. Recovery experiments were conducted with low, medium, and high concentrations. The recovery rates were 72.1%–89.8%, the relative standard deviations were less than 8.6%, and the limit of quantification was 20 μg/kg. The established method was rapid, efficient, sensitive, and specific, meeting the requirements for the determination of penicillic acid in cereals. The method exhibits high sensitivity, accurate results, and stable recovery, making it suitable for detecting penicillic acid residues in cereals.
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高影响因子
LANGMUIR
·
2024
·
IF 3.7
Jiang Yang,Rongrong Fan,Yingcheng Li,Xiujuan He,Xiaolong Zhao
Surfactants are widely used as foaming agents to remove liquid accumulation in gas wells, enhancing natural gas production. The surfactant used in traditional foam sticks was dissolved and released as foam in a short period, especially at elevated downhole temperatures. This often requires the addition of foam sticks to maintain foam. To solve this problem, this study studies the utilization of nano silica to incorporate the amphoteric surfactant, cocamidopropyl betaine (CAB), into the mesoporous structure of silica nanocomposite as foam sticks for controlled release of CAB. Mesoporous nano silica was prepared by a sol–gel acid-catalyzed process with a silica precursor. The formation of nanocomposite solid sticks containing the amphoteric surfactant was achieved by aging and drying. The composite was characterized by various techniques: infrared spectroscopy, thermogravimetric analysis, energy-dispersive spectrometry, scanning electron microscopy, transmission electron microscopy, and small-angle X-ray diffraction. Results showed that 49.3% of CAB was encapsulated within the mesoporous structure of 30–50 nm nano silica. CAB release over time in aqueous solution at 130 °C exhibited 10.1% surfactant left in the nanocomposite after 72 h, as determined by thermal analysis. Surfactant release was systematically evaluated through foam performance tests. The study revealed that CAB could be control-released over 168 h via CAB diffusion from mesoporous silica. This study provides a longer-lasting foam method to enhance gas production by utilizing mesoporous silica as a control release medium for gas well deliquification.
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PubMed
高影响因子
Processes
·
2024
·Vol. 12
·期 3
·498
·
IF 2.8
Xiaoming Zeng,Hao He,Liejiang Yuan,Haizhi Wu,Cong Zhou
A combined dispersed liquid–liquid microextraction (DLLME) and chromatography (GC) method was developed for the determination of 24 aromatic substances in rosemary hydrosol in this work. The pretreatment method of DLLME was optimized by carefully selecting the appropriate extraction agents, dispersants, and their respective amounts. With carbon tetrachloride as the extractant and acetone as the dispersant, the enrichment factor of DLLME is 13.3, and the 24 target substances such as eucalyptol, camphor and verbenone can be separated within 31 min and quantified by an external standard method using gas chromatography (GC). The correlation coefficient r2of the linear regression equation is within the range of 0.9983 to 0.9991. The detection limit of the method was 0.02 mg/L, the recovery rate of the spiked solution was 76.4–118.4%, the relative standard deviation was 0.4–6.9% and the method was used to detect the semi-finished products of rosemary hydrosol and the finished rosemary hydrosol sold on the market. This method also provides a reference for the qualitative and quantitative determination of aromatic substances in other hydrosols.
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高影响因子
POLYMER
·
2024
·
IF 4.1
Yanghang Liu,Heyu Zhang,Tao Zhang,Yuefei Ding,Siqi Zhang,Dan Yu,Wei Wang
Gas sensors are crucial in various applications such as environmental monitoring, industrial safety, and air quality control. However, many of these sensors still encounter significant challenges, including complex fabrication processes, low sensitivity, and poor stability. This study presents the development of a novel photochromic sensor using spiropyran (SP), waterborne polyurethane (WPU), and cellulose nanofiber (CNF) aerogel, aiming to overcome these challenges and provide highly sensitive detection of acidic gases. Under ultraviolet (UV) irradiation, the SP component in the aerogel isomerizes to its open-ring merocyanine (MC) form, which is further protonated to protonated merocyanine (MCH) in the presence of acid vapors. Systematic testing reveals that the SP/WPU/CNF aerogel sensor exhibits a rapid response time of 20 s under UV light irradiation and retains 75 % of its photoresponsivity after 20 cycles, demonstrating excellent durability. Additionally, the sensor exhibits a response time of 20 s to acidic gases, with a color change from purple to yellow when exposed to HCl gas at concentrations as low as 1 ppm. After undergoing five protonation and recovery cycles, the sensor maintains a certain level of acid responsiveness. These exceptional properties highlight the potential of the SP/WPU/CNF aerogel-based sensor to be a highly sensitive, efficient, and stable solution for acidic gas detection.
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Advanced Materials Interfaces
·
2024
·Vol. 12
·期 1
·2400565
·
IF 4.3
Na Kong,Ting Ren,Hui Yang,Mia Angela N. Judicpa,Ken Aldren S. Usman,Xu Zhao,Yanqiu Shao,Joselito M. Razal,Jinlong Tao,Jizhen Zhang
Flexible gas sensors are gaining interest for real-time volatile gas monitoring. A natural rubber (NR)/MXene nanocomposite sensor is developed. Among the six selected target volatile gases, the composite sensor exhibited a strong response value (82% toward 100 ppm NH 3 ) with the fastest response/recovery time (12.3 s/15.5 s) to NH 3 . The sensitivity showed a clear dependence of gases, suggesting a good selectivity to varying gases. Ti 3 C 2 T x MXene gas sensors exhibited a very low limit of detection of 50–100 ppb for volatile organic compounds (VOCs) at room temperature. In addition, the NR/MXene sensor allows detection of the mixture of ammonia (NH 3 ), dimethyl sulfoxide (DMSO), and acetone (C 3 H 6 O) and it shows good response depending on the total concentration of VOC gases. Furthermore, the flexible nanocomposite sensor exhibits stable sensing performance at different bending states (0-120°) and shows 20-day atmospheric stability. This sensor's ability extends to alcohol breath analysis, useful for drunk driving detection. This work paves the way to the possibility of using robust MXene-based toward practical realization of electronic devices.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yu-Ting Huang,Lan-Yu Fan,Yu-Feng Liu,Xiao-Hong Zheng
Triethylamine (TEA) is an organic amine released by fish products during spoilage, and the concentration of TEA can be detected by sensors to determine the freshness of fish. However, current TEA sensors face issues such as low response, high detection limits, and high power consumption. In this paper, pure phase molybdenum trioxide nanosheets (MoO 3 Ns) with high-performance TEA detection were prepared by hydrothermal method. By adjusting the calcination temperatures, the sensor response was enhanced, and both the detection limit and power consumption were reduced due to chemical sensitization and reasonable interactions between the material surface and the target gas. Material characterization indicates that MoO 3 calcined at 400°C exhibits a lamellar morphology, high catalytic activity, and a crystal surface with abundant hydroxyl groups, adsorbed oxygen, and Mo 6+ . By adjusting different calcination temperatures, the response was improved and the detection limit and power consumption were reduced based on chemical sensitization and reasonable interaction between the material surface and the target gas. Material characterization indicates that MoO 3 calcined at 400°C exhibits a lamellar morphology, high catalytic activity crystal surface with abundant hydroxyl groups, adsorbed oxygen, and Mo 6+ , and has suitable specific surface area with wide pore size distribution. Gas sensitivity tests reveal that the MoO 3 -400 based sensor demonstrates excellent performance, including a high response (280/50 ppm), low detection limit (1 ppm), and low power consumption (235°C). Furthermore, the sensor exhibits outstanding cycling, long-term stability, and selectivity. Finally, the sensor's applicability was demonstrated by measuring TEA released by crucian carp to evaluate fish freshness. This paper introduces a novel method for rapidly assessing fish spoilage, providing a significant contribution to food safety.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Shang Gao,Xinmeng Li,Chenyu Wang,Ruihua Yuan,Qin Zhang
Although metal-organic framework (MOF) derivatives are expected to exhibit advanced gas sensing properties, few amorphous MOF derivatives have been synthesized and used as gas sensors because common synthetic methods usually yield crystalline derivatives. In this work, an amorphous derivative of ZIF-67 consisting of nanocubes with an average size of about 200 nm was synthesized by calcining ZIF-67 at 260 ℃. The amorphous derivative started to transform into crystalline Co 3 O 4 at a calcination temperature of 270 ℃, during which the nanocubes collapse into nanoparticles . The amorphous derivative has a high specific surface area of 350.2 m 2 /g and a high mesopore ratio of 77.3 %. Remarkably, the amorphous derivative of ZIF-67 delivers a significantly enhanced response of 74.8–100 ppm triethylamine (TEA) gas at a low working temperature of 100℃ (30 % relative humidity), which is superior to that of ZIF-67 and its crystalline derivative. In addition, the amorphous derivative offers higher selectivity, greater long-term stability and good response under high relative humidity conditions. The response and recovery times are 125 s and 88 s. The improved gas sensing performance is mainly attributed to the high adsorbed oxygen content, large specific surface area and higher porosity of the material. The synthetic method detailed here could facilitate the development of gas sensors based on amorphous materials.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 4
·e70109
·
IF 0
Yun Xiong,Yifan Shu,Shi Cai,Shengpeng Liu,Xiaoyu Wu
The efficient separation of gases under high-temperature industrial conditions is crucial for addressing global energy and environmental challenges, particularly in processes such as CO₂ capture in natural gas processing, power plant flue gas treatment, and cement plant emissions. However, conventional membranes often suffer from interfacial defects, low gas selectivity, and poor thermal stability, which limit their practical applications. In this study, we aimed to develop high-performance mixed matrix membranes (MMMs) to improve CO₂/CH₄ separation performance. Amino-functionalized UiO-66-NH₂ was incorporated into a polyimide (PI) matrix using a simple, scalable fabrication process involving phase inversion and thermal imidization, which ensured uniform dispersion of UiO-66-NH₂ particles and facilitated large-scale production of dense, defect-free membranes. At an optimal UiO-66-NH₂ loading of 2 wt%, the MMMs achieved a CO₂ permeability of 451 Barrer and a CO₂/CH₄ selectivity of 6.62 at 25°C and 0.1 MPa, representing improvements of 23.91% and 114.94%, respectively, compared to pure PI membranes. The performance enhancement was attributed to the increased free volume within the membrane and the strong Lewis acid–base interactions between the amino groups of UiO-66-NH₂ and CO₂ molecules. Long-term stability testing at 300°C demonstrated excellent thermal stability, with consistent gas separation performance maintained over 160 h, confirming the membranes' suitability for high-temperature industrial applications. Furthermore, the UiO-66-NH₂/PI MMMs achieved an excellent balance between high permeability and selectivity, outperforming both organic and inorganic membranes, as well as certain traditional MOF-based MMMs. These findings offer a promising strategy for the development of robust and sustainable MMMs for high-temperature industrial gas separation processes.
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