SENSORS AND ACTUATORS B-CHEMICAL
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2015
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IF 4.097
Hu Meng,Wei Yang,Xiaohui Yan,Yanggang Zhang,Liang Feng,Yafeng Guan
A highly sensitive and fast responsive semiconductor metal oxide detector based on In 2 O 3 nanoparticle film was developed and evaluated. The mechanical structure of the detector was properly designed to obtain a small chamber volume in order to well fit to a commercial gas chromatographic capillary column. The detector was constructed by coating In 2 O 3 nanoparticle film onto a small ceramic plate. Results indicate that the proposed semiconductor metal oxide detector in this study shows a fast response (several seconds) and a high sensitivity. Moreover, the detector can be operated at ambient condition, which largely simplifies the design of portable gas chromatograph. The fabricated detector was also used to detect gas mixtures with a detection limit down to several ppb. It is concluded that the semiconductor metal oxide detector based on nanostructured materials possesses great potential for constructing portable gas chromatograph.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2013
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IF 2.487
Huijun Liu,Hong Wang,Caixia Li,Lichao Wang,Zaifa Pan,Lili Wang
Headspace solid-phase microextraction (HS-SPME) combined with gas chromatography/mass spectrometry (GC/MS) method was applied for the investigation of low molecular weight volatile organic metabolites (VOMs) in pleural effusion samples. Three important HS-SPME experimental parameters that influence extraction efficiency (fiber coating, extraction time and temperature of sampling) were optimized by a univariate optimization design. The highest extraction efficiency was obtained when sampling was performed at 50 °C for 10 min under agitation using a carboxen/polydimethylsiloxane (CAR/PDMS) fiber. A total of 36 volatile metabolites belonging to nine distinct chemical classes were identified in 40 pleural effusion samples (20 malignant effusions from lung cancer patients and 20 benign effusions from inflammatory patients). Ketones, alcohols, and benzene derivatives were the main chemical classes for the metabolomic profile of malignant effusions. The average peak areas of ketones and alcohols were much higher in malignant group compared to benign group. Together with phenols, they exhibit significant differences ( P < 0.05) between the two groups. Particularly, the average peak areas of cyclohexanone and 2-ethyl-1-hexanol in malignant effusions were significantly higher than those in benign ones. Furthermore, of the 36 identified metabolites, 5 compounds including cyclohexanone and 2-ethyl-1-hexanol were found to be statistically different (Student's t -test, P < 0.05) between the two groups by statistical analysis based on the peak areas of all identified metabolites. Among them, cyclohexanone and 2-ethyl-1-hexanol might be considered as candidate biomarkers of lung cancer to differentiate malignant from benign effusions. The results show that HS-SPME-GC/MS is a simple, rapid, sensitive and solvent-free method for the determination of VOMs in pleural effusion samples. Pleural effusion is a valuable sample source for observation of changes in VOMs for differentiation between lung cancer patients and inflammatory individuals.
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PubMed
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RSC Advances
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2015
·Vol. 5
·期 24
·18666-18672
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IF 3.84
Dongzhi Zhang,Jingjing Liu,Hongyan Chang,Aiming Liu,Bokai Xia
This paper demonstrated a hybrid composite of tin oxide–reduced graphene oxide (rGO) for ppm-level detection of ethanol vapour. A facile and low-cost method of hydrothermal synthesis was used to construct the SnO2–rGO hybrid film on a PCB substrate with coil-like interdigital microelectrodes. The presence of small-sized SnO2 nanocrystals on rGO sheets was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), an X-ray diffractometer (XRD) and Brunauer–Emmett–Teller (BET) measurements. The sensing properties of the SnO2–rGO hybrid film sensor, including the sensitivity, response–recovery times and repeatability, were investigated by exposing it to various concentrations of ethanol gas varying from 1 ppm to 100 ppm at room temperature. As a result, the presented sensor exhibited a low detection limit of 1 ppm at room temperature, as well as a fast response–recovery time and good repeatability, which outstripped that of pure rGO film sensors. Finally, the possible mechanism of ethanol gas-sensing for the above presented sensor was discussed in detail.
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JOURNAL OF MEMBRANE SCIENCE
·
2015
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IF 5.056
Qingping Xin,Tianyu Liu,Zhao Li,Shaofei Wang,Yifan Li,Zhen Li,Jingyi Ouyang,Zhongyi Jiang,Hong Wu
An octahedral metal–organic framework (MIL-101(Cr)) with a uniform size of ~550 nm was synthesized via hydrothermal reaction , and then was functionalized with sulfonic acid groups by concentrated sulfuric acid and trifluoromethanesulfonic anhydride. Mixed matrix membranes (MMMs) were fabricated by incorporating the as-prepared metal organic frameworks into sulfonated poly(ether ether ketone) (SPEEK). The gas separation performance of MMMs was investigated both in dry and humidified state. The addition of the sulfonated metal–organic framework increased the selectivity of the membranes for CO 2 /CH 4 and CO 2 /N 2 systems by increasing the CO 2 solubility, and the diffusion of gases through the porous metal organic frameworks led to the simultaneous increase in CO 2 permeability. The highest ideal selectivities for CO 2 /CH 4 and CO 2 /N 2 were 50 and 53 (at a CO 2 permeability of 2064 Barrer) in humidified state, respectively. The increased total water in MMMs led to increased CO 2 permeability and the increased bound water resulted in the improved CO 2 /gas selectivity. The effects of operating conditions on separation performance were investigated.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Liu Yang,Ning Ma,Zhenchang Fang,Kaijia Jiang,Xinling Li,Zhen Huang
The low capture loading is one of the main issues in developing the physical solvent biphasic absorbent. To address this issue, a small amount of polyamine TEPA was introduced as an activator into the DMAPA-Sulfolane-H 2 O (DSH) solution, aiming to design a novel diamine-based physical solvent biphasic absorbent DSH-TEPA for efficient CO 2 capture from flue gas in this study. The enhancement of TEPA on the phase separation and the capture performance was illustrated by experiments and molecular simulations. Experimental results revealed that DSH-0.20 M TEPA presented excellent enhancement performance for CO 2 capture: increased by 18.6 % of the absorption loading, 19.4 % of the rich phase loading, 7.8 % of the amine availability, 12.3 % of the overall mass transfer coefficient, 17.5 % of the desorption loading when comparing with DSH. In addition, DSH-0.2 M TEPA could achieve regeneration energy as low as 2.045 GJ/t CO 2 , which was 42.8 % lower than 30 wt% MEA, and lower than most of the reported physical solvent biphasic absorbents. For the application test, an increase in the CO 2 concentration in the flue gas could effectively increase the absorption rate and loading while there was an optimal gas flow rate for a certain CO 2 concentration to obtain higher capture performance. The enhancement mechanism of TEPA was analyzed elaborately by 13 C NMR characterization and quantum chemistry calculations and 134 possible types of TEPA-derived products were depicted according to the unique structure of TEPA. The higher polarity of TEPA-derived products and the stronger hydrogen bonds between TEPA-derived products and H 2 O confirmed the TEPA role as not only an excellent capture loading activator but also an effective phase separation accelerator.
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Water
·
2024
·Vol. 16
·期 24
·3658
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IF 3
Jialin Chen,Yi Xie,Jun Xia,Xiaolin Zhang,Dong Chen
An advanced photochemical reduction system involving the UV/Fe(III)–oxalate system was developed for the reduction of nitrate (NO3−) to harmless N-gaseous species, primarily nitrogen (N2), by carbon dioxide radical (·CO2−) generated in the presence of dissolved oxygen (DO). Electron paramagnetic resonance (EPR) analyses confirmed the presence of both ·CO2−and ·OH radicals. Systematic investigations were conducted on various operational parameters, such as the initial Fe(III) concentration, oxalate concentration, and pH levels, to assess their impacts on the efficiency and products of NO3−reduction. Notably, solution pH played a significant role in influencing the NO3−reduction efficiency and the final products. At pH 2, approximately 75% of NO3−was converted into N2with an 80% selectivity. In the pH range of 3 to 5, a remarkable NO3−removal rate of about 90% was achieved. Furthermore, higher concentrations of Fe(III) (2 mM) and oxalate (10 mM) were found to enhance NO3−removal to 91.95% and 88.71%, respectively. The presence of DO increased the oxidative potential in the reaction system, subsequently enhancing the selectivity conversion of NO3−to N2. In summary, the UV/Fe(III)–oxalate system exhibits significant potential for effective removal of NO3−while achieving high selectivity for the production of N2in water remediation applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Bingyu Zhao,Haojie Li,Zian Chen,Jiawei Lin,Yaodong Liu
The potential of carbon molecular sieve membranes (CMSM) for gas separation is widely recognized, and the key precursor for these membranes is polyimide (PI). This study focuses on enhancing the gas separation properties of CMSMs by introducing a unique structural element, Tröger’s bases, into polyimides, resulting in the creation of five distinct polyimides containing Tröger’s bases (PI-TBs). The incorporation of Tröger’s bases has a profound impact on the arrangement of polymer chains within the PIs, leading to a substantial improvement in gas permeability without compromising selectivity. Following carbonization at 600 °C, the resultant CMSMs exhibit significantly enhanced gas permeability while preserving, and in some cases, improving gas selectivity. Among the various types of diamines considered, the 6FDA variant of PI-TB stands out, boasting outstanding gas permeability with a H 2 permeability of 4991.0 Barrer and a H 2 /CH 4 selectivity of 30.7; this level of performance surpasses the 2015 Robeson’s upper bound. Furthermore, thermal analysis coupled with mass spectrometry (TG-MS) reveals that the pyrolysis of Tröger’s bases commences prior to that of polyimide . This sequential degradation process facilitates the formation of pyridine N and promotes the π-stacking of PI chains; both of which are instrumental in maintaining excellent gas selectivity. These findings provide valuable insights into the roles of Tröger’s bases in enhancing the gas separation performance of PIs and CMSMs, offering a promising avenue for further advancements.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Xiaoxia Zhang,Zhipeng Zhou,Junjie Liao,Liping Chang,Jiancheng Wang,Weiren Bao
The ultra-deep removal of thiophene from coke oven gas (COG) is critical for the conversion of COG to methane. Currently, Cu/ZnO/Al 2 O 3 is considered as a promising sorbent for thiophene removal; however, its desulfurization performance is currently unable to meet the requirements for industrial applications. Here, a zirconium modification strategy is proposed to overcome this problem, allowing zirconium loaded copper-based sorbents (Cu/ZnO/Al 2 O 3 /ZrO 2 ) with significantly improved thiophene removal performance and high activity to be obtained. Characterization results showed that zirconium improved both the dispersion of copper and the concentration of Lewis acid sites on the sorbent surface. A ZrO 2 concentration of 2 % resulted in stronger Cu-Zn interaction, and the dispersion of Cu on the surface of the sorbent reached its maximum value (49.20 %). Additionally, the Lewis acid strength was also maximized, which greatly improved the desulfurization activity and resulted in a breakthrough adsorption capacity of thiophene (Q b-thiophene ) of 36.24 mg/g, which was about 17 % higher than that of the unmodified Cu/ZnO/Al 2 O 3 sorbent. These results demonstrate that the sulfur capacity of the sorbent can be increased by increasing the number of acidic sites on its surface, paving the way for ultra-deep thiophene removal in industrial applications.
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POLYMER COMPOSITES
·
2025
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IF 4.7
Linyan Wang,Haibo Cui,Mingzheng Hao,Tao Zhang,Zhuorui Li,Yurong Liang,Youyi Sun
A reduced graphene oxide/nitrile butadiene rubber (rGO/NBR) composite membrane with high rGO content is prepared by combining electrostatic self-assembly and the vacuum filter method for application in gas barrier. In this process, GO induced the formation of chemical cross-links in NBR in the absence of vulcanization additives, which increased the cross-link density of the rGO/NBR composite film, and at the same time enhanced the interfacial interactions between the rGO and NBR matrix. The rGO/NBR composite film possesses an intra-layer isolation network and an inter-layer orientation structure. The resultant rGO/NBR composites with 40 wt% rGO loading exhibit a dramatically low gas permeability coefficient of 5.87 × 10 −17 cm 3 cm/cm 2 s 1 Pa 1 , which is reduced by 96.5% compared to the pure NBR. Furthermore, the gas barrier performance of the rGO/NBR composite membrane exhibits favorable thermal stability, in which the permeability coefficient changes very little at 65°C. These good performances are attributed to the dual network structure and strong interface interaction of the rGO/NBR composites. This work provides a new insight into the design and preparation of rGO/rubber composites with high rGO content for various applications. Highlights A high-performance rGO/NBR composite with high rGO content was prepared. It shows a dramatically low gas permeability coefficient. It exhibits good thermal stability for gas barrier properties.
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Nanoscale
·
2024
·Vol. 16
·期 6
·3034-3042
·
IF 5.8
Haoyang Wu,Zhili Wang,Benqiang Tian,Yaping Li,Zheng Chang,Yun Kuang,Xiaoming Sun
Electrocatalytic CO2 reduction (ECR) to high value-added chemicals is an excellent method to attenuate the impact of greenhouse effect caused by CO2. At the same time, multicarbon products (C2+) get extensive attention in view of their relatively high energy density and market price. At present, Cu is an important metal electrocatalyst to convert CO2 into multicarbon products (e.g. ethylene, ethanol, and n-propanol); however, its poor selectivity impedes its practical application. It is well-known that the Cu(100) crystal facet can enhance the selectivity toward multicarbon products among different Cu crystal facets. Herein, the Cu nanoparticles were firstly prepared using the inductive effect of different gases (CO2, CO, Ar, N2, and air) during the Cu electrodeposition processes, in which the CO2-induced Cu catalyst (Cu-CO2) showed the largest normalized content of the Cu(100) crystal facet and the highest C2+ faradaic efficiency of 69% at a current density of 80 mA cm−2 in ECR. Subsequently, the different CO2 pressures during the Cu electrodepositions were studied to reveal the optimal CO2 pressure in the CO2-induced Cu synthesis for improved Cu(100) content as well as C2+ faradaic efficiency. Finally, density functional theory (DFT) calculations confirmed that CO2 molecules preferred to get adsorbed on the Cu(100) crystal facet, which resulted in not only the presence of dominant Cu(100) during the CO2-induced Cu synthesis but also the good electrocatalytic performance in ECR.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yan Xin,Binfei Li,Zhaomin Li,Zongyang Li,Bo Wang,Xiaopu Wang,Mengyuan Zhang,Weitao Li
During the CO 2 flooding process in fractured low-permeability oil reservoirs, the injected CO 2 is prone to channeling along fractures due to severe reservoir heterogeneity, resulting in poor development effect. The CO 2 -responsive gel system shows dual advantages in achieving CO 2 capture and plugging gas channeling to enhance oil recovery. This paper constructed a system with good CO 2 sensitivity based on long-chain alkyl amide propyl dimethyl tertiary amine first. Subsequently, the properties of the system before and after the response were evaluated through rheological test, and its microstructure was characterized by Cryo-TEM. The system exhibited good CO 2 responsiveness, transitioning from low-viscosity solution system to high-viscosity CO 2 -responsive gel system upon contact with CO 2 , with its viscosity increasing by nearly five orders of magnitude. The CO 2 -responsive gel demonstrated excellent shear resistance, viscoelasticity and shear self-repairing ability. The change of microstructure further verified the mechanism of molecules self-assembly in the system under the action of CO 2 . Then, a series of core physical simulation experiments were carried out to comprehensively evaluate the effects of different factors on the injection capacity, plugging characteristics, dynamic filtration damage performance and EOR effect of CO 2 -responsive gel. The gel maintained injectability while achieving an exceptional deep plugging effect, and the plugging rate reached 98.77%. It showed good characteristics of low filtration and permeability damage in low permeability reservoirs, effectively ensuring the fracture plugging effect. After the fracture was plugged by gel, the sweep range of CO 2 to the matrix significantly expanded, and the gas flooding recovery increased by 18.19–21.7%. Finally, the matrix-fracture dual-media chip model was used to conduct microfluidic experiment, the oil displacement characteristics in different displacement stages were visually clarified, and the synergistic plugging and oil displacement mechanism between the CO 2 -responsive gel and CO 2 was summarized. The research results can provide important insights for the green and efficient application of CO 2 -responsive gel in fractured low-permeability reservoirs.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Longqi Yao,Zhihua Zhao,Chen Chen,Zhigang Shao,Lan Wu
Amine-based gases have become an important indicator for detecting the decay of seafood, especially during the transportation and storage process. Triethylamine (TEA) is continuously produced as a result of slow decay, therefore, detecting the release of TEA from the food spoilage to indirectly measure the freshness of seafood has become a crucial method. However, the current TEA sensors frequently encounter issues such as low sensitivity, poor selectivity, or the necessity for higher operating temperatures, all of which hinder their practical application in seafood quality detection. In our work, for the first time, the gas-sensitive response of Bi 2 S 3 to TEA at room temperature (25 ℃) was improved by the composite of ZnO nanoparticles. The response to 100 ppm TEA is 2.51, which is 3.7 times that of pure Bi 2 S 3. The response/recovery time is 49/270 s. The materials structure and composition were studied by the methods like XRD, SEM, XPS, FTIR, and TEM, and the surface area of the nanocomposites was 24.6 m 2 /g, which could provide more adsorption sites. Then a response mechanism was proposed based on those characterization results. Meanwhile, the experimental verification shows that the sensor have excellent selectivity, repeatability and stability. Finally, a TEA detection equipment was designed to effectively detect the TEA produced by decayed marine fish. This work reports the first example of fabrication Bi 2 S 3 /ZnO Nanocomposites for TEA Gas Sensors at room temperature, and thus it’s also the first report about the application of Bi 2 S 3 /ZnO gas sensor for food safety. The gathered results reveal great prospects of TEA gas sensors for the food quality monitoring during transportation and storage.
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