JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Qigao Shang,Yuhao Cheng,Zhenpeng Gong,Ying Yan,Bo Han,Guiying Liao,Dongsheng Wang
The porous organic polymers have been considered as effective materials for gas storage and adsorption. Herein, we synthesized highly crystalline nitrogen-rich covalent triazine frameworks (CTFs) by polycondensation for preparing the novel hyper-cross-linked conjugated polymers (HCCPs) with tunable specific surface area and pore volume through coupling Friedel-Crafts reaction, in which 1,4-Bis(chloromethyl)benzene and 4,4-Bis(chloromethyl)biphenyl as the expansion molecules were pillared between the layers of CTF-HUST. This technology not only increased the specific surface area and total pore volume of CTF-HUST by 2.56 and 4.68 times, but also greatly enhanced the utilization of adsorption sites of CTF-HUST. The HCCP2–1.25 exhibited the highest surface area (1349.29 m 2 g −1 ) among these HCCPs and demonstrated excellent adsorption performance for ethyl acetate (1605.14 mg/g), ethanol (1371.49 mg/g), 1,2-Dichloroethane (1971.68 mg/g), benzene (1151.77 mg/g) and toluene (1024.28 mg/g) due to the multiple C-H…O, C-H…Cl, O-H…N and C-H…π interactions between volatile organic compounds (VOCs) and HCCPs framework. Moreover, CO 2 and H 2 storage capacities of the HCCP2–1.25 were 8.02 wt% and 1.54 wt%, 1.66 and 1.67 times higher than CTF-HUST, respectively. This study developed a simple and effective molecular expansion strategy to synthesize a series of novel high-surface-area porous polymers for potential applications in the environmental field.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Zhen Yuan,Qiuni Zhao,Chunyan Xie,Junge Liang,Xiaohui Duan,Zaihua Duan,Shaorong Li,Yadong Jiang,Huiling Tai
NO 2 is one of the recognized six major pollutants worldwide. Its monitoring and forewarning are indispensable for human health. Thus, a practical sensor with rapid response and high sensitivity would endow us with an effective acknowledgment of NO 2 distribution. In this work, the gold-loaded tellurium (Au@Te) nanobelts are synthesized through a one-pot hydrothermal process. According to various characterization, including X-ray diffraction, atomic force microscope , transmission electron microscopy , the formation of tellurium nanobelts with a typical thickness of 18 nm and flower-like gold nanoparticles with a diameter of 50–200 nm is confirmed. Based on these, the Au@Te sensor exhibits appealing sensing properties in a comprehensive measurement considering the practical application scenarios, including a sensitivity of 0.028 ppb -1 (0–50 ppb), a limit of detection with ppt-level (~83 ppt), rapid response (11.3 s towards 5 ppm), good repeatability and selectivity. Meanwhile, the long-term stability is measured under continuous charging in accordance with actual application scenarios. A stable response along 28 days is observed. This work provides an efficient strategy for the fabrication of NO 2 sensors, together with a case for gas sensor evaluation towards specified application scenarios.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Yingni Yu,Jing Liu,Yingju Yang,Junyan Ding,Aijia Zhang
Iron oxide (Fe 2 O 3 ) has been used as an effective sorbent to remove various heavy metals due to its large adsorption capacity and low cost. The cadmium capture capability of Fe 2 O 3 sorbent was investigated in the simulated flue gas at the temperatures of 700–1100 °C. Fe 2 O 3 sorbent exhibited much better Cd adsorption capability than SiO 2 and Al 2 O 3 sorbents. The largest Cd adsorption capacity of Fe 2 O 3 sorbent was 86.7 mg/g at 700 °C. The XPS analysis demonstrated that Fe 3+ might partially participate in the cadmium adsorption process. A large quantity of CdO was generated and adsorbed on the Fe 2 O 3 surface. The density functional theory (DFT) calculations were used to determine the active sites and the involved mechanism of different cadmium species adsorption over Fe 2 O 3 sorbent. Cd, CdCl 2 , and CdO can be stably adsorbed on the Fe 2 O 3 surface with the adsorption energies of −40.64 kJ/mol, −237.42 kJ/mol, and −375.03 kJ/mol, respectively. The results illustrate that the Fe atoms are the essential active sites for cadmium species adsorption on Fe 2 O 3 surface. The orbital hybridization between cadmium atom and Fe site suggests that the strong interaction occurs during Cd adsorption process. Both physisorption and chemisorption mechanisms were responsible for the cadmium capture by Fe 2 O 3 sorbent.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yuting Wang,Xiaoqiong Fu,Tianqi Wang,Feng Li,Dan Li,Ying Yang,Xiangting Dong
In this work, a Cu 2 ZnSnS 4 (CZTS)-based gas sensor incorporated by polyoxometalate(POMs) electron acceptor were synthesized by hydrothermal method . For the first time we investigated on the application of CZTS in NO 2 sensor and the influence of POMs incorporating on gas sensing performances of CZTS sensor. As a result, the gas sensing response could be remarkably improved to 6.12 times by incorporating POMs compared with pure CZTS. This is mainly attributed to introducing POMs into CZTS could reduce electron-hole recombination and facilitate electrons transfer. The research results exhibit the highest gas sensing response of CZTS-based gas sensor up to now. This research reveals a new idea for developing high-performance gas sensors based on CZTS by introducing POMs.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Qiuci Yu,Weigang Kong,Yuchi Zhang,Xianliang Li,Yan Xu
Hierarchical multi-metal oxide-based gas sensors with high surface area and abundant active sites have attracted intensely research interests for their highly sensitive and fast gas detection performance. Developing synthetic strategies for obtaining novel hierarchical metal oxides with high sensing performance remains eminently challenging. Herein, hierarchial hollow GaFeO 3 microcubes were successfully prepared via a Ga 3+ -modified Fe-based Prussian Blue (PB) mediated template conversion strategy. The microsized morphologies and hollow interior structures of GaFeO 3 microcubes can be feasibly modulated by controlling the thermolysis temperatures. The ultrasmall nanoparticle-assembly of GaFeO 3 architecture obtained at 500 °C exhibited an optimum response value (R a /R g ) of 7.4, and rapid response/recovery times (9 s/49 s) toward 200 ppm triethylamine (TEA) at a working temperature of 200 °C, as well as remarkable selectivity and excellent long-term stability (for at least 31 days), which are intrinsically beneficial from the unique interior loose structure with good permeability for diffusion of target gases. This work provides a promising approach for synthesizing various hierarchical multimetal oxides with intriguing nanoparticle-assembled hollow structure and broad prospects for practical gas sensing applications.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Guoxiong Deng,Jiangzhou Luo,Xiangyun Liu,Xibo Zhang,Yilei Wang,Xueping Zong,Song Xue
In this work, a series of symmetrical “H-shaped” tetramine monomers bearing different amounts of side groups and linking units were designed and synthesized via a simple one-step electrophilic substitution reaction of aromatic dialdehyde and aniline. Then, these new designed tetramine monomers using as the crosslinking center were reacted with 6FDA to prepare the network polyimide (PI) membranes. Due to the robust 3D crosslinked structures, all the network PI membranes possessed high rigidity ( T g = 322 ∼ 337 °C), excellent thermal stability ( T d , 5% =425 ∼ 471 °C), and superior mechanical performance with the tensile strengths ranging from 107.2 to123.0 MPa and elongations of 4.2–5.4%, while the stone-like solubility in common solvents. Interestingly, during the period of tridimensional polycondensation reaction of these designed network PIs, a broad operating flexibility without the risk of gelation was observed, which is beneficial to their actual productions. Furthermore, gas transport results proved that changing the amounts of CH 3 side groups at the ortho -positions of the aniline ring and extending their framework’s linking units in the crosslinking center provide viable ways to fine-tune the fractional free volume (FFV) within the polymers, which in turn tailor their gas transport properties efficiently. Specifically, the optimum membrane termed as 6FDA-OHTA showed a huge increment about ∼ 340% for CO 2 permeability accompanying with only ∼ 5.6% reduction for CO 2 /N 2 ideal selectivity in comparison with those of the original 6FDA-PTA membrane. We hope this study can open a new avenue to the rational design of network PI membranes to meet various separation needs, especially from the view of crosslinking center structure variation.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Ming-Bang Wu,Hao Ye,Zhi-Yuan Zhu,Guo-Tao Chen,Lu-Lin Ma,Shi-Cheng Liu,Lin Liu,Juming Yao,Zhi-Kang Xu
Nanofiltration (NF) shows great application potentials in selectively recovering lithium (Li) from natural brine to meet the rapidly growing demands in lithium-ion batteries. However, it remains challenges in how to fabricate positively-charged NF membranes via a convenient method since conventional polyamide-based NF membranes are negatively-charged, which exhibit undesirable Mg 2+ /Li + selectivity according to the Donnan and electrostatic effects. Herein, we report a new kind of interfacial polymerization (IP) for preparing positively-charged NF membranes at the gas/liquid (GL) interface by replacing the amine solution with amine gas. Compared with the traditional liquid/liquid interfacial polymerization (LLIP), the amine monomers are always more abundant than the acyl chloride monomers during the GLIP process. Therefore, enough amino groups are desirably remained, resulting in positively-charged polyamide-based layers. In addition, the surface charges as well as the average pore sizes of the polyamide-based layers can be facilely adjusted by the reaction time due to the slow reaction kinetics in the GLIP process. The as-prepared NF membranes show a relatively high rejection for MgCl 2 of 98.5% and low rejection for LiCl of 22.6%, demonstrating their excellent Mg 2+ /Li + selectivity. Moreover, the NF membranes can also maintain the high Mg 2+ /Li + separation factors as high as 28 during a long-term operation.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Jinyu Huang,Hao Liang,Jiexiong Ye,Dongting Jiang,Yiling Sun,Xuejin Li,Youfu Geng,Jiaqi Wang,Zhengfang Qian,Yu Du
Au-loaded ZnO were successfully prepared by means of seed-assisted solvothermal methods. The vertically ordered nanorod arrays are uniformly grown on the Al 2 O 3 substrate. The sensing properties of ZnO and Au-loaded ZnO sensors toward HCHO were investigated. Remarkably, the sensor based on 4 wt%Au-loaded ZnO nanorod arrays exhibits high response, short response and recover times, excellent selectivity, as well as low HCHO detection limit at 70 °C. After the incorporation of Au nanoparticle, the detection limit decreases from 10 ppm to 0.25 ppm, and the response increases more than 20 times under 100 ppm HCHO at 70 °C. Moreover, the mechanism of HCHO sensing with Au-loaded ZnO was explored by the calculations obtained from the first-principle studies.
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高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2021
·Vol. 32
·期 9
·095114
·
IF 2.046
Qianchun Zhang,Yan Wang,Qin Zhou,Yafei Chen,Yuguo Zheng,Shan Tang,Yuxian Zhao,Li Jiang
Nonmetallic nanocatalysts have demonstrated powerful potential in cataluminescence (CTL) sensing fields. In this study, an original method for the fabrication of a CTL gas sensor was developed to detect acetylacetone based on nanosized hexagonal boron nitride (h-BN). The luminescence characteristics and optimum operating temperature, wavelength, and carrier gas flow rate parameters for the h-BN sensor were studied in detail. Compared with other common gases (such as cyclohexanone, acetaldehyde, and acetone), the fabricated sensor demonstrated a high selectivity and sensitivity toward acetylacetone. This was verified by density functional theory calculations, which were consistent with the experimental results. The CTL intensity and concentration of acetylacetone had a linear relationship in the range of 0.050–20 μg ml−1 (r = 0.9989) with a low detection limit of 16 ng ml−1 (S/N = 3). The developed sensor was applied to analyze spiked samples, and satisfactory recoveries for acetylacetone of 82.2%–118% were obtained with excellent reproducibility (2.8%–11%). These results indicated that the system has excellent sensing properties including a high selectivity, sensitivity, and stability, proving its broad application prospects for detecting acetylacetone.
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高影响因子
POWDER TECHNOLOGY
·
2021
·
IF 5.134
Qingqing Hu,Donglai Ma,Yongjie Liu,Qingyun Huang,Zhixiong You,Xuewei Lv
Ferrochromium nitride is an important alloying additive for smelting nitrogen–containing steel. Preparing nitrides by using ammonia gas as reducing and nitriding agent is characterized by high–efficiency and carbon free. In this study, the reaction behavior between chromite spinel and ammonia gas was investigated. Thermodynamic analysis revealed that the reaction was feasible. The transformation of chromite spinel as well as the final products were dependent on reaction temperature, time and input fraction of ammonia gas. The experimental results proved the effect of reaction parameters on the reduction and nitridation process. Chromite spinel was reduced and nitrided to form metallic iron and CrN at temperatures below 950 °C, while metallic iron and Cr 2 N were the main products at 1000 °C. XPS analysis also proved the existence of CrN and Cr 2 N. Ferrochromium nitride with N content treater than 15 wt% was obtained when reducing above 950 °C for 3 h.
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高影响因子
AICHE JOURNAL
·
2021
·Vol. 67
·期 10
·e17373
·
IF 3.993
Kaiqiang Shi,Xiaozhi Xu,Siyuan Dong,Biao Li,Jingbin Han
Inorganic–organic hybrid films containing two-dimensional nanosheets have shown good gas barrier performance, but moderate tensile property, because of the rigid characteristics of covalent or ionic bonds between the assembly units. In this work, we used LDH nanosheets rich in hydroxyl groups as building units, followed by modification of tannic acid (TA), to assemble with polyethylene oxide (PEO) through hydrogen bonds. Compared with previous work, the tensile property and oxygen barrier performance of (TA@LDH/PEO) n films have been significantly improved. A 50-bilayer TA@LDH/PEO film, deposited on a 1 mm thick natural rubber substrate, results in a 29× reduction (contrast with bare substrate) in oxygen transmission rate and maintains its good barrier property even under a large elongation of 120%. The excellent tensile and gas barrier properties are attributed to the ductility of hydrogen bond network among building blocks and the significant prolongation of oxygen transmission path induced by LDH nanosheets.
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Shuangping Xu,Wenqiang Ma,Hailiang Zhou,Yushu Zhang,Hongge Jia,Jingyu Xu,Pengfei Jiang,Xintian Wang,Wenwen Zhao
Hybrid membranes containing different loadings of butadiene-bridged polymethylsiloxane (BBPMS) in ethyl cellulose (EC) were prepared by an one-pot blending method from a non-isolated solution of polymethylhydrosiloxane (PMHS) reaction with butadiene, and a solution of EC in THF. The semi-crosslinked BBPMS and the BBPMS/EC hybrid membranes having good compatibility were characterized by Fourier transfer infrared (FTIR) and Scanning electron microscopy (SEM). The BBPMS/EC hybrid membranes exhibited good membrane forming ability, heat resistance and mechanical properties. It was worth mentioning that the BBPMS/EC blended membranes exhibit good selectivity for CO 2 /N 2 and O 2 /N 2 . Specifically, the blended membrane (BBPMS/EC-5:5) showed the highest ideal selectivities for CO 2 /N 2 and O 2 /N 2 were 25.5 (at a CO 2 permeability of 175 Barrer) and 4.85 (at a O 2 permeability of 33.2 Barrer), respectively. Compared to the pure EC membrane, the ideal CO 2 /N 4 selectivity and the ideal O 2 /N 2 selectivity of the blended membrane (BBPMS/EC-5:5) were increased by 41.8% and 53.0%, respectively. The modification strategy using semi-crosslinked polysiloxanes to enhance gas transfer of EC is promising for fabrication of high performance CO 2 and O 2 separation membranes.
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高影响因子
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