CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Leong Sing Soh,Seang Uyin Hong,Can Zeng Liang,Wai Fen Yong
In quest of sustainable development, research efforts have been focused on replacing conventional toxic solvents with green solvents to fabricate greener membranes, illuminating the significant role of green chemistry and engineering to promote a circular economy. Nevertheless, the use of green solvents in membrane technology is still in the early stages since its practicality remains elusive. This work demonstrates the preliminary screening of green solvents using Hansen solubility parameters (HSP), followed by an optimization of the synthesis conditions of polyimide using the selected green solvent. Based on HSP evaluation, TamiSolve® NxG is identified as a potential green solvent for polyimide synthesis. Two synthesis approaches such as chemical imidization and one-step high temperature polymerization are examined by varying monomer concentrations, polymerization temperatures, imidization time, and imidization temperatures. The polyimide membranes developed from the optimized synthesis conditions ameliorate the gas separation performance with more than 30 % increment in O 2 and CO 2 permeabilities without compromising their O 2 /N 2 , CO 2 /N 2 , and CO 2 /CH 4 selectivities. Additionally, the membranes prepared from green solvent-synthesized polyimide exhibit a remarkable enhancement in CO 2 plasticization pressure up to 25 bar which outperform that of conventional membranes within 5–15 bar.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Huicong Zuo,Chunqiang Lu,Lei Jiang,Xianming Cheng,Zhiqiang Li,Yuelun Li,Danyang Li,Hua Wang,Kongzhai Li
Linz-Donawitz converter gas (LDG), an important by-product in the steel industry with CO (55–60 vol%) and CO 2 (15–20 vol%) as the main components, is usually used as fuel for heating or power generation, releasing massive of diluted CO 2 with the concentration lower than 15 % that is difficult to capture. Herein, we propose a method to produce pure H 2 via chemical looping water splitting by using LDG as reducing agent, which can easily concentrate CO 2 for capture. Fe 2 O 3 , one of the most environmentally friendly and low-cost oxides, was chosen as the oxygen carrier to perform this concept. It was found that the addition of small amounts of Ce 0.75 Zr 0.25 O 2 solid solution could strongly improve the activity of Fe 2 O 3 for CO conversion, especially at relatively low temperatures. Compared with pure Fe 2 O 3 , the CO conversion and H 2 yield were increased from 39.5 % and 0.34 mmol·g −1 to 100 % and 2.32 mmol·g −1 at 650 °C, respectively, after adding 5 wt% of Ce 0.75 Zr 0.25 O 2 . The strong interaction between the two oxides contributed to the enhanced performance via promoting CO adsorption and lattice oxygen releasing. Water splitting assisted by air oxidation could fully regenerate the reduced oxygen carrier, and the oxygen carrier was stable during the long-term chemical looping process, with the CO 2 capture rate at ca. 95.8 %. In situ DRIFTS results showed that CO 2 was produced through a direct reaction of lattice oxygen with CO, and the decomposition of carbonate species intermediate by adsorption of CO on the surface of oxygen carriers. This study gave full evidence that it was feasible for achieving H 2 generation and CO 2 capture in one step via chemical looping reforming of reducing exhaust gases (e.g., LDG) from industrial emissions.
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2023
·
IF 12.6
Huayun Chen,Zhiheng You,Yuhui Hong,Xiao Wang,Mingming Zhao,Yushi Luan,Yibin Ying,Yixian Wang
Highly sensitive and specific identification of complex volatile organic compound mixtures has always been a huge challenge in the field of gas detection. To address this issue, the gas-responsive two-dimensional metal–organic framework (MOF) composites have been designed for fabricating a colorimetric sensor arrays for extremely sensitive detection of volatile organic compounds (VOCs). The physically exfoliated MOF nanosheets Zn 2 (bim) 4 with large surface area and abundant unsaturated active sites were used for loading various dyes to form dye/Zn 2 (bim) 4 composites. Due to the protective effect on dye activity and preconcentration for VOCs, the dye/Zn 2 (bim) 4 composites-based colorimetric sensor arrays showed significantly enhanced sensitivity compared with the corresponding dyes for the detection of various VOCs. The mechanical flexibility of the dye/MOF nanosheets endowed the excellent film-forming properties on various substrates for fabricating the colorimetric sensor arrays. Besides owing to the hydrophobic property and the protection of the Zn 2 (bim) 4 nanosheets, the dye/Zn 2 (bim) 4 sensor arrays exhibited excellent anti-interference including humidity and temperature influence. On the basis of the fantastic properties of dye/Zn 2 (bim) 4 composites for VOCs detection, the dye/Zn 2 (bim) 4 sensor arrays were applied for the early perception of the plant disease late blight via ultra-sensitive and highly specific sensing the VOCs released from the infected plants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Renjie Xie,Jianbin Lu,Jian Wang
The detection of dissolved gases in the oil of oil-immersed transformers is essential to evaluate the operating status of oil-immersed transformers. In this study, a CuO/TiO 2 /N-MWCNTs composites-based sensor was fabricated by hydrothermal method for the detection of dissolved CO gas in oil. The introduction of N-MWCNTs with high specific surface area, high electrical conductivity and multiple adsorption sites effectively improved the response value and response/recovery performance for CO. The response can reach 4.33 at a CO concentration of 50 ppm, which is 1.74 times higher than that of the CuO/TiO 2 sensor. In addition, the prepared sensor presents a fast response/recovery time (230 s/60 s) to CO, and has excellent selectivity and long-term stability. Finally, a multi-concentration CO alarm system was constructed through a reasonable circuit design. It is shown that the CuO/TiO 2 /N-MWCNTs-based sensor can achieve high-precision CO detection, which can provide a new idea for the detection of dissolved CO gas in the oil of oil-immersed transformers.
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2023
·
IF 3.7
Jingwei Zhang,Jianhong Xu,Zhuo Chen
Micro-packed beds have the advantages of excellent heat and mass transfer efficiency and high safety, which have been successfully applied to hydrogenation and oxidation reactions. The dispersion behavior of multiphase flow is closely related to mass transfer and reaction performance. However, the study of dispersion law in micro-packed beds is not sufficient. This work investigated the dispersion behavior of gas–liquid/liquid–liquid two-phase flow in micro-packed beds. The average size and distribution of droplets/bubbles were measured in different systems. Key parameters that affect the dispersion characteristics of the two phases were observed experimentally, including gas/liquid phase flow rate, size of the packing, and physical parameters of the systems. The experimental results showed that gas–liquid and liquid–liquid dispersion processes exhibited different characteristics due to the different physical parameters of liquid and gas as the dispersed phase. The fracture driving force of the gas–liquid process was mainly from the continuous liquid phase, while the fracture driving force of the liquid–liquid process came from both the dispersed phase and the continuous phase.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
J.Y. Yong,R.Y. Xie,Q. Huang,X.J. Zhang,B. Li,P.F. Xie,C.F. Wu,L. Jiang
Due to the superior CO 2 adsorption capacity and selectivity, amine-functional solid adsorbents have received increasing attention. Nevertheless, amine-functionalized polyporous materials have a large performance deviation when considering carbon removal capacity under wet flue gas. Therefore, a variety of metal–organic frameworks (MOFs) with amine functionality are synthesized in this work by appending diamine with a propylene linker to Mg 2 (dobpdc) (dobpdc 4- = 4,4′-dioxido-3,3′-biphenyldicarboxylate) and screened under the simulated flue gas environment with a high water content (7 v%). The results indicate that ndmpn-grafted Mg 2 (dobpdc) (ndmpn = N,N-dimethyl-1,3-propanediamine) has a high CO 2 adsorption capacity of 1.72 mmol/g at 60 °C with an extremely low regeneration heat (2.26 GJ/ton CO 2 at the desorption temperature of 145 °C). Adsorption property of ndmpn-Mg 2 (dobpdc) at high humidity is even more excellent than that of another well-reported diaminopropene-appended MOF, dmpn-Mg 2 (dobpdc) (dmpn = 2,2-dimethyl-1,3-propanediamine). Herein, van der Waals (vdW)-corrected density functional theory (DFT) calculations are used to quantitatively analyze binding strengths and water effects on it between diamine-appended Mg 2 (dobpdc) and CO 2 . It is revealed that the addition of water makes ammonium carbamate chains produced in ndmpn-Mg 2 (dobpdc) more stable. These chemisorption structures under humid conditions have also been disclosed by using 15 N solid-state nuclear magnetic resonance (NMR) spectroscopy experiments and DFT calculation. To conclude, we unveil the binary adsorption characteristics and mechanism of ndmpn-Mg 2 (dobpdc). It enables a thorough understanding of this compound and highlights its potential as a promising adsorbent under humid conditions for post-combustion applications.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 48
·105685-105699
·
IF 5.8
Dong Pei,Shan Peipei,Wang Shuaijun,Ge Baosheng,Zhao Chaocheng
In this work, efficient Fenton strategy have been proposed for degradation of shale gas fracturing flow-back wastewater using the spherical Fe/Al 2 O 3 supported catalyst. Prior to actual fracturing fluid treatment, the typical model wastewaters such as p -nitrophenol and polyacrylamide were employed to evaluate the catalytic properties of prepared catalyst, and then Fenton treatment of the shale gas fracturing flow-back wastewater was performed on the self-assembled catalytic degradation reactor for continuous flow purification. Results showed that under the conditions of 0.25 mol L −1 impregnating concentration, pH 4, 50 g L −1 catalyst and 0.75 mL L −1 30% H 2 O 2 , the removal efficiency of p -nitrophenol and polyacrylamide reached 74% and 61%, respectively, while the COD removal of fracturing flow-back fluid was approximately 48% with the residual 88 mg L −1 COD, meeting the emission standards of the integrated wastewater discharge standard (GB 8978-1996, COD < 100 mg L −1 ). This work offers new alternatives for Fenton treatment of real wastewater by efficient and low-cost supported catalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Mingmai Bao,Jiahui Bai,Ying Wang,Suzhen Zhu,Yingchao Liu,Tianlun Wen,Jing Zhang,Shuang-cheng Ma,Yinlong Guo
Liquid chromatography–mass spectrometry (LC-MS) is widely used in the detection of pesticide residues. However, the detection sensitivity of low-polarity pesticides by commonly used electrospray ionization may be severely suppressed, which greatly affects the limit of detection and repeatability. Herein, a plasma-excited nebulizer gas-assisted electrospray ionization (PENG-ESI) device has been developed. By introducing the discharge plasma formed by Tesla coil into the electrospray nebulizer gas channel, the sensitivity of low-polarity pesticides was significantly increased while maintaining sensitivity to polar pesticides. Under the optimized conditions, the limit of detection for S-bioallethrin was achieved at the level of 100 pg/g with good linearity (R2 > 0.99) and precision (RSD ≤ 4.61%). The matrix effect of a series of spiked matrix samples is less than 13.1%. Finally, different pyrethroid pesticide residues were successfully analyzed without separation, highlighting that the technology has potential application prospects in food quality control, environmental monitoring, and other fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 23
·2300251
·
IF 2.5
Huiping Qi,Yanzhen Liu,Shi Shen,Jiafei Zhao
Green polymer poly- l -proline, as a new type of biodegradable polymer material, has a wide application prospect in the field of environmental protection. Recent studies have shown that poly- l -proline can also act as a green inhibitor that is highly effective in inhibiting the production of gas hydrates in oil–water systems. As a natural polymer material, poly- l -proline has good biocompatibility and biodegradability and will not cause pollution to the environment. It is found that adding an appropriate amount of poly- l -proline to the oil–water system can significantly inhibit the formation of gas hydrates. This is because poly- l -proline can reduce the concentration of dissolved gases in water by adsorbing and dispersing ions and molecules in water, thereby reducing the chance of gas forming hydrates with water. In addition, poly- l -proline can also prevent gas molecules from entering water molecules to form hydrates by forming hydrogen bonds with water molecules. This study provides a green, environmentally friendly and efficient solution for controlling the formation of gas hydrates in oil–water mixtures. In the future, the application prospects of poly- l -proline in oil–water separation, marine engineering, natural gas exploitation, and other fields will be broader.
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2017
·Vol. 218
·期 22
·1700275
·
IF 2.5
Jiawei Xu,Chong Zhang,Zexiong Qiu,Zhenyu Lei,Bing Chen,Jia-Xing Jiang,Feng Wang
Two kinds of novel triphenylphosphine-containing microporous organic polymers are designed and synthesized via palladium-catalyzed Sonogashira−Hagihara coupling condensation reaction of triphenylphosphine oxide- and sulfide-based monomers with different arylethynylene linkers. The gas adsorption isotherms reveal that these polymers have strong binding affinity for CO 2 with high CO 2 adsorption capacity, although they have moderate Brunauer−Emmett−Teller surface area ranging from 684 to 883 m 2 g −1 . Among the resulting polymers, triphenylphosphine oxide–tris(4-ethynylphenyl)amine exhibits the highest CO 2 uptake capacity of 2.61 mmol g −1 at 273 K and 1.13 bar with relatively high gas selectivity of 60.2 for CO 2 over N 2 at 273 K.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Lili Gong,Zhili Cai,Can Wang,Ju Bai,Linglong Shan,Xianghai Meng,King Lun Yeung,Haitao Zhang,Zhichang Liu,Shuangjiang Luo
Superacid-catalyzed polymers of intrinsic microporosity have attracted increasing attention in membrane-mediated gas separation due to their good processability, facile polymerization procedure, and tunable microporosity and gas separation performance. In this study, we synthesized a series of new superacid-catalyzed polymers with fully ladder backbones and well-defined micropores using a one-pot condensation polymerization. The incorporation of a contorted spirobisindane building block facilitated the formation of highly microporous structures in the resulting polymers, enhancing their intrinsic microporosity and gas separation properties. Among the three SACPs, SACP-PhMe exhibited the largest d-spacing value, specific surface area, and pore volume due to its bulkiest side group. The gas separation performance of the SACP membranes surpassed several benchmark polymer membranes, with the SACP-PhMe membrane demonstrating excellent performance in separating CO2/CH4, H2/CH4, O2/N2, and H2/N2. The SACP-Me membrane exhibited the lowest porosity, making it less susceptible to CO2 absorption and showing superior plasticization resistance. The results highlight the promising gas separation properties of the SACPs and their potential for various gas separation applications, offering new opportunities for advanced polymer membrane design.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhijia Liao,Ninghao Chu,Zhenyu Yuan,Renze Zhang,Hongmin Zhu,Yanbai Shen,Fanli Meng
The novel copper hydroxyfluoride-copper oxide (CHFCO)/zinc hydroxyfluoride-zinc oxide (ZHFZO) nanomaterials were prepared by hydrothermal method and exhibited superior sensing performance for methamphetamine analogue-phenethylamine. The sensing characteristics of calcined ZHFZO rods, CHFCO flakes, and four composite nanomaterial ratios were examined. The experimental results demonstrated that the CHFCO/ZHFZO-2 sensor exhibited improved sensing performance for phenethylamine, with the optimum working temperature reduced to 200 ℃. The responses of the ZHFZO and CHFCO sensors to 10 ppm phenylethylamine were 1.9 and 3.5, respectively, while the response of the CHFCO/ZHFZO-2 sensor was enhanced to 5. With a response time (T res ) and recovery time (T rec ) of 30 s for 10 ppm phenylethylamine, the sensor enables rapid detection. It has great selectivity and reproducibility for phenylethylamine and can detect concentrations as low as 125 ppb, demonstrating its potential for quantitative detection at the parts per billion (ppb) level. The prepared composites possessed unique nanostructures and large specific surface areas . The substitution of fluoride ions produces a large electronegativity and the physical adsorption of polar hydroxyl bonds combine to enhance the sensitization of phenylethylamine gas. The findings presented in this study underscore the promising potential of the synthesized nanomaterials for highly sensitive and selective detection of phenylethylamine.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）