Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 27
·14326-14335
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IF 14.511
Qihua Sun,Zhaofeng Wu,Zhangjie Qin,Xuan Chen,Chuanchuan Zhang,Biaobing Cao,Haiming Duan,Jun Zhang
Inspired by the similarity between the pleated structure of rose petals and the pleated structure of a dog's maxillary turbinate, porous biomass carbon materials with a pleated structure have been successfully prepared from rose petals by direct carbonization. Detailed SEM and TEM characterization showed that the carbonized rose tea (CRT) at 600 °C exhibited a mimetic structure very similar to the dog's maxillary turbinate. The trace K element was detected in the prepared CRT materials, which effectively improved the adsorption capacity of the CRT materials for NH3 as revealed by density functional theory based on first-principles calculations. As a result, the CRT sensor showed an ultra-high response (60.16k%) to 500 ppm NH3 with a theoretical detection limit of only 4.82 ppb, in addition to showing a fast recovery (2.0 s), excellent repeatability and long-term stability. Moreover, the formation of nanopores in the pleated structure of the CRT and the sensing mechanism of NH3 were analyzed. Through a simple, inexpensive and efficient method, this study provides a new strategy for the preparation of a high-performance gas sensor with a bionic structure by directly using the similarity between the biomass structure and dog nose structure.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Zhihua Gao,Fengyan Fu,Zhaozhi Zhang,Lili Niu,Min Jin,Jian Zhang,Zekun Zhao
Support materials are indispensable to promote the durability of iron oxides for chemical looping applications. However, the dilution effect of supports on the active phase would lead to decreased bulk oxygen conduction, thus leading to compromised activity. Here, we propose several Gd 3+ , La 3+ and Nd 3+ doped CeO 2 as active supports for iron oxides and investigate the support effect to improve hydrogen generation via chemical looping water gas shift . The characterizations show that the dopants improve the oxygen vacancy concentration in the CeO 2 lattice and Fe 2 O 3 /Ce 0.8 Gd 0.1 La 0.1 O 2-δ exhibits the most oxygen vacancy concentration among all the oxygen carriers. Pulse reactions of oxygen carriers show that an abundance of oxygen vacancy concentration can promote the lattice oxygen transfer in bulk, thus contributing to improved redox reactions . The high oxygen conductivity mitigates the dilution effect on the active phase. Therefore, Fe 2 O 3 /Ce 0.8 Gd 0.1 La 0.1 O 2-δ shows the highest hydrogen yield (∼9.49 mmol −1 .g −1 ) and hydrogen generation rate (∼0.632 mmol.g −1 .min −1 ) with only a slight decrease at 650 °C over 100 cycles. Overall, this work highlights the influence of support properties on the redox reactivity of iron oxides for chemical looping applications.
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JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Yan Du,Xiaohui Yan,Yuanbo Chen,Yi Wu,Qiankun Qiu,Yanshuo Li,Dapeng Wu
Magnetic polyimide nanosheet microspheres (PI-NMs) were used for magnetic solid-phase extraction (MSPE) for the first time. The PI-NMs were modified with magnetic Fe 3 O 4 nanoparticles by chemical coprecipitation to produce the PI-NM/Fe 3 O 4 composite. The prepared composite possessed a nanosheet structure, large specific surface area (71.5 m 2 /g), high saturation magnetization (19.1 emu/g), large adsorption capacity (≥ 676 ng/mg for selected estrogens), and good extraction stability (> 10 times). Trace estrogens in environmental water and urine samples were extracted by the PI-NM/Fe 3 O 4 composite, desorbed, derivatized, and analyzed by gas chromatography–mass spectrometry (GC-MS). The derivatization, extraction, and desorption conditions were optimized. Extraction equilibrium was achieved within 1 min due to the good dispersibility and large specific surface area of the PI-NM/Fe 3 O 4 composite. Under the optimized conditions, the MSPE/GC–MS method validation results showed wide linearity (0.02–50 µg/L or 0.05–50 µg/L), high determination coefficients ( R 2 ≥ 0.9983), good intraday and interday precisions (expressed as relative standard deviation, RSDs ≤ 8.2%), and low limits of detection (LODs, 0.001–0.015 µg/L). For the real environmental water and urine samples, the recoveries and RSDs were 77.0–112.5% and 0.1–10.7%, respectively. The performance of the MSPE/GC–MS method proved that the PI-NM/Fe 3 O 4 composite was a good alternative material for the extraction of organic pollutants in aqueous samples.
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APPLIED ENERGY
·
2022
·
IF 11.446
Wei Cai,Ying Pan,Xiaming Feng,Xiaowei Mu,Weizhao Hu,Lei Song,Xin Wang,Yuan Hu
The severe light reflection phenomenon has become a critical challenge for the sufficient utilization of solar energy. For preventing the predation risk, cicada’s wings are gradually evolved into transparent morphology to preferably blend into the natural environment. The high solar transmittance in cicada wings is due to the presence of surface micro/nanostructures which avoids the large change of refractive index between air and wings. Herein, inspired by the high solar transmittance of cicada’s wings, an extremely-simple gaseous phase deposition with low heating temperature is developed to cover graphene film with methyl-modified silicon dioxide (CH 3 -SiO 2 ) nanospheres that decelerate the refractive index reduction. The destructive interference effect of CH 3 -SiO 2 nanospheres effectively increases the solar transmittance to promote the absorption and conversion of solar energy into heat by graphene nanosheets. As a result, compared to pure graphene film, CH 3 -SiO 2 nanospheres covered graphene (SiO 2 -graphene) film presents a temperature increase of ∼6.3 °C with solar illumination of 1.0 kW/m 2 . After being combined with zwitterion-modified cotton fabric, a novel solar steam generation system mainly composed of SiO 2 -graphene film is prepared. Due to the hydrophobicity of CH 3 -SiO 2 nanosphere and the hydration effect of zwitterionic polymer, the salt precipitation and oil fouling problems regarded as major challenges in solar desalination are simultaneously solved, thus achieving water evaporation rate near 1.40 kg/m 2 h at oily seawater environment. Most importantly, the solar transmittance enhancement and anti-reflection design inspired by cicada wings provide a valuable reference to promote the solar absorption capacity of other photo-thermal conversion materials.
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Chuang Wang,Hou-Yong Yu,Zhouyu Miao,Dan Ge,Somia Yassin Hussain Abdalkarim,Juming Yao
A series of gas sensors based on compound conductive polymers and metal oxides with p–n heterojunctions have received a lot of interest. Also, the gas response is significantly enhanced using three-dimensional (3D) porous structured aerogels as carriers. Here, we report a sustainable and highly sensitive gas sensor based on self-formed grapefruit peel aerogel (GPA) loaded with polyaniline (PANI)-ZnO nanohybrids (PANI-ZnO@GPA). ZnO nanorods are produced in situ on the GPA surface (with a porosity of 93.8%) skeleton, adsorbing PANI nanoparticles (NPs) evenly to construct PANI-ZnO nanohybrids. PANI-ZnO@GPA demonstrates excellent gas sensing behaviors for ethanol, acetic acid, ammonia, and formaldehyde gases and high structural stability with 10% linear compression rebound and steady sensing properties even at 50% compression. It is shown that composite aerogel can successfully detect formaldehyde at the 10–1000 ppm level and with a sensitivity of 0.134% ppm–1. Furthermore, it is capable of restoring the initial sensing performance after only 3 min of sunlight exposure. This work is expected to provide new ways to expand the sustainable sensors in the rapid and sustainable detection of volatile organic compounds (VOCs).
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Zhipeng Tian,Weijie Zhang,Tao Liu,Jianping Liu,Chenguang Wang,Libin Lei,Mingzheng Liao,Chao Wang,Ying Chen
Hydrogen production by catalytic aqueous phase reforming (APR) of biomass-derived oxygenates is a promising route to produce hydrogen in a renewable way. As the typical APR catalyst, Pt/Al 2 O 3 is confronted with high methanation activity that consumes H 2 and produces undesired CH 4 during the treatment of methanol solution. In contrast, WGS reaction is the main pathway to boost H 2 generation during APR process. In this work, a series of PtFe/Al 2 O 3 catalyst with different Fe contents were prepared, characterized and tested for the methanol APR reaction. XRD , TEM, XPS and H 2 -TPR technologies were applied to study the change of physicochemical properties with the addition of iron. The restriction on methanation and promotion on WGS reaction were proved as well. With the increase of Fe content, the interaction between Pt and FeO x species have both positive and negative effects on APR reactivity while the CH 4 selectivity descending continuously from 9.25% to as low as 0.60%. Besides, the effects of reduction temperatures (250–350 °C) of Pt0.5Fe/Al 2 O 3 catalyst on APR performances were also investigated. An “Oxygen dynamic transfer cycle” between H 2 O/CO∗ and FeO x species with oxygen vacancies is proposed and verified. This indirect WGS reaction through lattice oxygen on FeO x species that boosting WGS reactivity helps improving H 2 selectivity in the gas products of methanol APR.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Run Zhang,Youling Hou,Gangqiang Fan,Dejun Huang,Xiaoming Ding,Jie Dang
The utilization of titanium-bearing blast furnace slag (TBFS) has been widely concerned, which is mainly related to the recovery of titanium resources. In order to realize the efficient and clean recovery of titanium resource, the main titanium-bearing phases (CaTiO 3 , MgTiO 3 and Mg 2 TiO 4 ) in TBFS with high content of MgO were investigated in CH 4 –H 2 system in this work. Thermodynamic calculation indicated that CaTiO 3 , MgTiO 3 and MgTi 2 O 4 could be ultimately reduced to TiC x O y at 1300 °C, 1200 °C and 1200 °C respectively. The reduction experiments were carried out in flowing CH 4 –H 2 , which considered the influences of time, temperature and addition, the results of which showed that the optimal reduction temperatures of CaTiO 3 and MgTiO 3 were 1400 °C and 1200 °C respectively. DFT calculation results also confirmed that MgTiO 3 had stronger CH 4 adsorption capacity than CaTiO 3 and Mg 2 TiO 4 . However, Mg 2 TiO 4 could not be reduced completely even at 1450 °C, because excessive MgO in the reduced products prevented further reaction in kinetics. Both increasing temperature and adding iron oxides contributed to the reduction kinetics . The results suggested that the appropriate increase of the proportion of MgO in TBFS was beneficial to titanium extraction. This work provides a way to develop new process to extract titanium from TBFS, especially the slag with high MgO.
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CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Linqing Tian,Li Ha,Li Wang,Guangjin Chen,Frederic Coulon,Yuelu Jiang,Xin-Yang Zeng,Ruifeng Zhang,Guozhong Wu
Solidified natural gas technology shows significant potential for storing safely multi-fold volumes of natural gas in clathrate hydrates, but the main concern is the stochastic and slow process of hydrate nucleation making it unstable and unpredictable in practice. To overcome this limitation, methane hydrate was synthesized in a silicon carbide (SiC) ceramic foam packing trays reactor without stirring. Results suggested that the packing trays should be located near the gas-water interface instead of immersed in the aqueous phase, which decreased the induction time by about 98%. Results also highlighted the synergistic effects between the capillary wicking from the porous packings and the water suction from the initially formed hydrate clusters, which pumped water from the aqueous phase into the packings’ pores to provide an unsaturated porous environment for hydrate nucleation. It demonstrated that these two driving forces might also compete for water which became adverse to hydrate formation.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Jiasheng Wang,Qingrong Wang,Mengdi Zhao,Ming Bao
Toluene gas-phase oxidation is a green, chlorine-free production process for benzaldehyde but its conversion efficiency is still unsatisfying due to the lack of highly efficient catalyst. Here the selective oxidation of toluene to benzaldehyde over V-Ag-Ce/TiO 2 under an air atmosphere was investigated. The catalyst was prepared by impregnation and characterized by scanning electron microscope (SEM), N 2 adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Electron paramagnetic resonance (EPR), H 2 temperature programmed reduction (H 2 -TPR), O 2 temperature programmed desorption (O 2 -TPD), and NH 3 temperature programmed desorption (NH 3 -TPD). The amount of oxygen vacancy and acid of the catalyst can be tuned through adjusting the V:Ag:Ce ratio. Over the optimum catalyst (V:Ag:Ce = 4:2:1, molar ratio), 92% benzaldehyde selectivity with a 27% toluene conversion can be obtained at 550 °C. Medium amounts of oxygen vacancy (0.43) and acidity (0.10 mmol/g) are found to be conducive to the conversion of toluene to benzaldehyde. This study has important theoretical guiding significance for improving conversion efficiency from toluene to benzaldehyde by gas-phase aerobic oxidation.
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 51
·期 1
·214-222
·
IF 1.938
Tian Chunxia,Tian Xi-ang,Li Yu,Wang Zhijun,Liu Li
Porous SnO 2 with high sensitivity and fast response has attracted much attention. Herein, we prepared 3D porous SnO 2 using carbon balls as a template and studied the effects of sintering time (1 h, 2 h, 3 h, 4 h) at a certain calcination temperature of 500℃ and Ho doping on the gas-sensing performance of 3D porous SnO 2 . The gas-sensing test results show that, compared with the samples obtained under other sintering time, the gas-sensing property of 3D porous SnO 2 calcined for 2 h has the highest gas sensitivity of 31 in the 50-ppm formaldehyde environment. Among the samples doped with Ho, 3D porous SnO 2 with a doping amount of 3.5% has the highest sensitivity of 65 at operating temperature of 230℃, which is twice as long as pure 3D porous SnO 2 with a calcination time of 2 h. Moreover, the sample has good selectivity, low detection limit, and good linearity. These excellent gas-sensing characteristics are mainly due to the unique morphology of 3D porous SnO 2 , more oxygen vacancies, and the influence of Ho doping. Therefore, the gas-sensing performance of the metal oxide semiconductor material can be further improved by forming the porous nanocomposite material. Graphical Abstract
(a) Response recovery time of SnO 2 obtained under different calcination times; (b) Response recovery time of SnO 2 doped with different Ho content.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Ning Ma,Xitao Wang,Xuemei Liu,Ningyan Li,Yuan Liu
Inhibiting the sintering of Cu-based catalysts for CO2 reverse water–gas shift (RWGS) reaction is still a great challenge. Herein, Cu–Al spinel supported on Al2O3 was prepared by a surface solid reaction and used as a precursor to obtain Cu particles with high dispersions and high stabilities. Due to the high dispersions of Cu cations in Cu–Al spinel, strong chemical interactions between Cu particles and newly generated Al2O3, and the isolation effects of Al2O3 particles, Cu particles derived from Cu–Al spinel exhibited smaller sizes after H2 reduction, excellent activities, and 300 h stabilities for RWGS reactions. However, Cu particles obtained from the supported CuO precursor showed much larger particle sizes (>70 nm) and inferior activities and stabilities for CO2 reverse water–gas shift reaction. This study made a successful attempt to enhance the activities and stabilities of Cu-based catalysts through changing the oxide precursor.
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MOLECULES
·
2023
·Vol. 28
·期 22
·7559
·
IF 4.6
Jinli Wen,Yue Wang,Yanli He,Nan Shu,Weiyu Cao,Yining Sun,Pengqiang Yuan,Bowei Sun,Yiping Yan,Hongyan Qin,Shutian Fan,Wenpeng Lu
Actinidia argutais a fruit crop with high nutritional and economic value. However, its flavor quality depends on various factors, such as variety, environment, and post-harvest handling. We analyzed the composition of total soluble sugars, titratable acids, organic acids, and flavor substances in the fruits of tenA. argutavarieties. The total soluble sugar content ranged from 4.22 g/L to 12.99 g/L, the titratable acid content ranged from 52.55 g/L to 89.9 g/L, and the sugar–acid ratio ranged from 5.39 to 14.17 at the soft ripe stage. High-performance liquid chromatography (HPLC) showed that citric, quinic, and malic acids were the main organic acids in theA. argutafruits. Headspace gas chromatography–ion mobility spectrometry (HS-GC-IMS) detected 81 volatile compounds in 10A. argutavarieties, including 24 esters, 17 alcohols, 23 aldehydes, 7 ketones, 5 terpenes, 2 acids, 1 Pyrazine, 1 furan, and 1 benzene. Esters and aldehydes had the highest relative content of total volatile compounds. An orthogonal partial least squares discriminant analysis (OPLS-DA) based on the odor activity value (OAV) revealed that myrcene, benzaldehyde, methyl isobutyrate, α-phellandrene, 3-methyl butanal, valeraldehyde, ethyl butyrate, acetoin, (E)-2-octenal, hexyl propanoate, terpinolene, 1-penten-3-one, and methyl butyrate were the main contributors to the differences in the aroma profiles of the fruits of differentA. argutavarieties. TenA. argutavarieties have different flavors. This study can clarify the differences between varieties and provide a reference for the evaluation ofA. argutafruit flavor, variety improvement and new variety selection.Keywords:Actinidia arguta;HPLC;HS-GC-IMS;flavor;organic acids;volatile compounds
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危险品化学品经营许可证（带存储）