ENERGY & FUELS
·
2017
·
IF 3.091
Zhitao Han,Shaolong Yang,Xinxiang Pan,Dongsheng Zhao,Jingqi Yu,Yutang Zhou,Pengfei Xia,Dekang Zheng,Yonghui Song,Zhijun Yan
Both cyclic and noncyclic scrubbing experiments were conducted to remove NO from simulated flue gas in a lab-scale countercurrent spraying reactor. The effects of various operating parameters (initial solution pH, NaClO concentration, absorbent temperature, and inlet NO and SO2 concentrations) on NO removal efficiencies were investigated in the noncyclic scrubbing mode. The results showed that NO removal efficiency increased greatly with the decrease of the initial pH value. However, there was a drop in NO removal efficiency, possibly due to the NO2 absorption in the gas phase. NO removal efficiency increased gradually with the increase of the NaClO concentration. Complete removal of NO was achieved when the NaClO concentration was 24 × 10–3 mol·L–1. However, the NO removal efficiency obviously decreased with the absorbent temperature increasing from 303 to 343 K. This could be mainly ascribed to the decrease of the water solubility of NO2 and the absorption reaction of NO2 with water vapor. Furthermore, NO removal efficiency increased quickly with the increase of the inlet NO concentration. The coexisting SO2 in the simulated flue gas had little effect on the NO removal efficiency. Both NO and SO2 could be removed simultaneously with a SO2 removal efficiency of 100% and a NO removal efficiency of >93%. More importantly, the results of cyclic scrubbing experiments indicated that an average NO removal efficiency of 74% had been obtained for the whole cyclic scrubbing duration. The utilization of NaClO oxidant was calculated to be approximately 83%. The ion chromatographic analysis showed that there was no ON2– in the spent liquor. The results demonstrate that NaClO is a low-cost high-efficiency oxidant for NO removal from exhaust gas and that it has great potential for industrial applications.
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JOURNAL OF PHYSICAL CHEMISTRY A
·
2017
·
IF 2.847
Jianqiang Zhu,Shuyan Wang,Narcisse T. Tsona,Xiaotong Jiang,Yifeng Wang,Maofa Ge,Lin Du
Rate constants at room temperature (293 ± 2 K) and atmospheric pressure for the reaction of methyl n-propyl ether (MnPE), CH3OCH2CH2CH3, with OH and NO3 radicals and the Cl atom have been determined in a 100 L FEP-Teflon reaction chamber in conjunction with gas chromatography-flame ionization detector (GC-FID) as the detection technique. The obtained rate constants k (in units of cm3 molecule–1 s–1) are (9.91 ± 2.30) × 10–12, (1.67 ± 0.32) × 10–15, and (2.52 ± 0.14) × 10–10 for reactions with OH, NO3, and Cl, respectively. The products of these reactions were investigated by gas chromatography-mass spectrometry (GC-MS), and formation mechanisms are proposed for the observed reaction products. Atmospheric lifetimes of the studied ether, calculated from rate constants of the different reactions, reveal that the dominant loss process for MnPE is its reaction with OH, while in coastal areas and in the marine boundary layer, MnPE loss by Cl reaction is also important.
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JOURNAL OF PHYSICAL CHEMISTRY A
·
2018
·
IF 2.836
Shuyan Wang,Lin Du,Jianqiang Zhu,Narcisse T. Tsona,Shijie Liu,Yifeng Wang,Maofa Ge,Wenxing Wang
Allyl acetate (AA) is widely used as monomer and intermediate in industrial chemicals synthesis. To evaluate the atmospheric outcome of AA, kinetics and mechanism of its gas-phase reaction with main atmospheric oxidants (O3, OH, Cl, and NO3) have been investigated in a Teflon reactor at 298 ± 3 K. Both absolute and relative rate methods were used to determine the rate constants for AA reactions with the four atmospheric oxidants. The obtained rate constants (in units of cm3 molecule–1 s–1) are (1.8 ± 0.3) × 10–18, (3.1 ± 0.7) × 10–11, (2.5 ± 0.5) × 10–10, and (1.1 ± 0.4) × 10–14, for reactions with O3, OH, Cl, and NO3, respectively. While results for reactions with O3, OH and Cl are in good agreement with previous studies, the kinetics for the reaction with NO3 is reported for the first time in this study. On the basis of determined rate constants, the tropospheric lifetimes of AA are τO3 = 9 days, τOH = 5 h, τCl = 5 days, τNO3 = 2 days. On the basis of the products study, reaction mechanisms for these oxidations have been proposed and the reaction products were detected using thermal desorption–gas chromatography–mass spectrometry (TD–GC–MS) and Fourier transform infrared spectroscopy (FTIR). Results show that the main products formed in these reactions are carbonyl compounds. In particular, 2-oxoethyl acetate was detected in all four AA oxidation reactions. Compared to previous studies, several new products were determined for reactions with OH and Cl. These results form a set of comprehensive kinetic data for AA reactions with main atmospheric oxidants and provide a better understanding of the degradation and atmospheric outcome of unsaturated acetate esters in the troposphere, during both daytime and nighttime.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 5
·3597-3611
·
IF 1.674
Zhou Xiao,Cao Limei,Yang Ji
An electrode in situ catalytic oxidation of elemental mercury (Hg 0 ) in flue gas using Fenton-like catalysts in a self-made reactor was proposed. The catalysts were prepared by a hydrothermal method, and the catalysts were loaded on the electrode and could improve the removal efficiency of Hg 0 . About 240 μg/m 3 of elemental Hg 0 could be removed in 40 min. The morphology and structure information of the prepared catalysts were characterized by SEM, EDS, XRD, SEM, XPS and so on. The effects of operation parameters (voltage, inlet flow, electrolyte concentration, initial concentration of Hg 0 , pH of solution) were investigated. The above results showed the strong oxidative effect of hydroxyl radicals (·OH), which was produced by the catalysts playing a dominative role during Hg 0 removal reactions. Graphical
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Scientific Reports
·
2017
·Vol. 7
·期 1
·7448
·
IF 4.259
Han Lina,Li Qinglian,Chen Shuai,Xie Wei,Bao Weiren,Chang Liping,Wang Jiancheng
A sort of magnetical material named Fe 3 O 4 –NH 2 –Pd was prepared by loading varying amounts of immobilizing Pd on the surface of the magnetic Fe 3 O 4 –NH 2 microspheres. This magnetical material was used firstly for capturing Hg° from coal derived fuel gas based on its recoverability. The experimental results showed that the loading Pd on the amine-functionalized magnetite nanoparticles can greatly improve the efficiency of removing Hg° at a high temperature range between 200 and 300 °C. The magnetic Fe 3 O 4 –NH 2 –Pd sorbent with 5% Pd loaded exhibited significantly high activity and stability in capturing Hg°, affording over 93% capture efficiency at 200 °C for more than 8 hrs. Compared to the Fe 3 O 4 –NH 2 sorbent that converted the Hg° as HgS, this Fe 3 O 4 –NH 2 –Pd sorbent can remove the Hg° by forming Pd-Hg amalgam and HgS. In addition, the experimental tests indicated that the as-synthesized Fe 3 O 4 –NH 2 –Pd sorbent still showed stable magnetic properties after two regeneration cycles in removing Hg°, which provided the opportunity for preparing a recyclable sorbent which can be easily separated and recovered for Hg° removal.
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WOOD SCIENCE AND TECHNOLOGY
·
2013
·Vol. 48
·期 1
·195-206
·
IF 1.884
Wang Ting,Si Hongyan,Li Bin
Poplar wood flour, a low-cost and abundantly available material, was modified by grafting β - cyclodextrin in the presence of citric acid, aiming to expand the application of wood flour. The product was characterized by Fourier transform infrared spectroscopy and the technique of the phenolphthalein probe. By the technique of inverse gas chromatography and the method of Hamieh, the values of surface free energy and nonpolar part of the free energy were obtained. The results demonstrate that the dispersive component of the surface free energy of the products will increase with temperature increases, and the product presents a Lewis basic character with K
b / K
a = 3.67. Based on the structure of the product, the basicity comes from two parts. One is the rich electronic environment of the β - CD inner cavity, and the other is the formation of ester bonds through crosslinking between β - CD and wood flour by CA.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 27
·期 2
·1817-1827
·
IF 1.569
Zhang Yong,Xie Long-zhen,Yuan Chao-xin,Zhang Chun-lin,Liu Su,Peng Ying-quan,Li Hai-rong,Zhang Miao
3D rose-like NiO nanoparticles have been prepared by electrodeposition method. The samples were characterized through X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The phase and morphology observations showed the formation of rose-like hierarchical structures with an average particle diameter of 400–500 nm. Gas sensing properties of the as-synthesized rose-like NiO nanoparticles were evaluated by the detection of volatile and toxic gases including ethanol, methanol, and acetone. It was found that NiO nanoroses exhibited a highly response to the three gases at 230 °C. Furthermore, at 5 ppm, the NiO nanorose-based sensor gave a higher response to ethanol ( R
g / R
a = 9.11) and methanol ( R
g / R
a = 8.36), in comparison with acetone ( R
g / R
a = 6.44). The results indicated the NiO nanorose-based sensors displayed a rapid response and recovery as well as good reproducibility.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhijia Liao,Zhenyu Yuan,Hongliang Gao,Fanli Meng
In this study, porous sheet-like nanostructured Co 3 O 4 -CuO-CuOHF composites with great n-butanol sensing properties were synthesized by the biotemplate method and hydrothermal method . The effect of various contents of Co 3 O 4 -CuO-CuOHF sensor performance was systematically investigated, in which the best performance was achieved for the composite with 0.03 g Co 3 O 4 addition. The response of the best content Co 3 O 4 -CuO-CuOHF composite sensor to 100 ppm n-butanol at 180 ℃ is 120, which is 8 times higher than that of the CuO-CuOHF sensor. The composite sensor has excellent selectivity for n-butanol and responds 3.75–25 times higher to n-butanol than other target gases. It is detectable up to 500 ppb n-butanol and has potential promise for low concentration detection. Furthermore, it has outstanding stability and resistance to humidity. The gas sensing mechanism was analyzed by UV–visible diffuse reflectance spectroscopy, EPR oxygen vacancies and X-ray photoelectron spectroscopy, which indicated that the abundant oxygen vacancies , the physical adsorption of polar hydroxyl bonds, the electronegative fluorine substitution and the special microstructure of the composite contributed to its gas-sensitive performance.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Xin Huang,Tingting Zhang,Haomiao Zhang,Jiahui Yang,Tingting Cui,Rui Cheng,Jian Yu
In recent years, the rapid advancement of carbon dots (CDs) has established them as highly promising candidates in the field of fluorescent nanomaterials. Microfluidic technology, known for its efficiency in nanomaterial synthesis, has encountered significant challenges in the production of CDs due to insufficient fluid driving force, a consequence of the high-pressure conditions generated in microfluidic channels during high-temperature reactions. This limitation has significantly constrained the application of microfluidic technology in synthesis of CDs. To address this issue, this study developed a controllable, high-pressure gas driven microfluidic platform, enabling the large-scale production of CDs with multicolor fluorescence emission. By precisely regulating the pressure in feedstock tank and the opening of control valves, continuous and stable fluid flow and reactions were maintained in high-temperature heated channels, even when using low-boiling-point solvents. Adjustments in reaction temperature and precursor selection facilitated the large-scale synthesis of CDs emitting blue, green, yellow, and red fluorescence (B-CDs, G-CDs, Y-CDs and R-CDs). Furthermore, the excellent biocompatibility and low toxicity of the G-CDs enabled the successful application in cellular imaging. This work provides a novel solution to the challenge of insufficient fluid driving force in microfluidic synthesis of CDs, and it is expected to promote further advancements in the use of microfluidic technology for large-scale production functional nanomaterial.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Feihu Li,Zhipeng Wang,Jiabao Wang,Bowen Yang,Ziqiang Zhang,Ruiming Yang,Guangqiang Chen,Yeguang Zhang,Fang Fang,Peng Wang,Fangfang Liu,Zili Zhan
Tuned LIG microstructures via laser parameters for high-efficiency H 2 sensing. • Developed a LIG-based flexible electrochemical hydrogen sensor with a response/recovery time of 2.6 s/3.2 s. • The sensor exhibits high selectivity, flexibility, linearity and stability. • Employing MnO 2 as the cathode material enables reliable hydrogen detection under oxygen-free conditions. Laser-induced graphene (LIG) technology has become an ideal strategy for fabricating electrode materials due to its ability to produce flexible graphene substrates rapidly and scalably. In this work, a planar flexible electrochemical hydrogen gas sensor with a quasi-fuel-cell structure is designed, which is based on a composite membrane electrode of LIG/Nafion/MnO 2 . By adjusting laser parameters, a porous laser-induced graphene (LIGP) substrate with high specific surface area and high graphitization is controllably fabricated. On this basis, an anode with low Pt loading is constructed. In particular, the arrayed gas diffusion channels enable hydrogen to diffuse and distribute directly and efficiently to the electrode surface. Manganese dioxide (MnO 2 ) serves as the cathode active material for the reduction reaction, replacing the kinetically sluggish oxygen reduction reaction (ORR) in conventional systems, thereby eliminating the dependence on oxygen. The optimized LIGP sensor exhibits response and recovery times of merely 2.6 s and 3.2 s, respectively, with a sensitivity up to 5.98 nA/ppm and a limit of detection (LOD) of 0.83 ppm, alongside excellent selectivity, long-term stability, and mechanical flexibility. This study integrates laser processing technology, electrode material optimization, and device structural innovation to achieve low cost and high sensing performance, providing a new route for the development and mass fabrication of flexible hydrogen sensors. Download: Download high-res image (298KB) Download: Download full-size image
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POLYMER
·
2026
·
IF 5.1
Ai Liu,Yingying Li,Zhengqi Wang,Zhongjuan Zhang,Xubin Wang,Senlin Chai,Xueli Wang,Jianyong Yu,Ruiyun Zhang,Faxue Li,Ruchao Yuan
Poly(ethylene terephthalate) (PET)-based copolyesters are promising materials for engineering films and packaging applications, yet simultaneously improving mechanical toughness and gas-barrier performance remains challenging because flexible comonomers typically increase chain mobility at the expense of ordered chain packing. Herein, a series of waste-PET-derived rigid–flexible copolyesters, P(ET-co-Pedol) n , were synthesized by glycolysis of waste PET to bis(2-hydroxyethyl) terephthalate (BHET), followed by melt repolycondensation with an aromatic polyether diol (Pedol, M n ≈ 800 g mol −1 ). Combined WAXD, SAXS, DSC, DMA, and rheological analyses revealed that Pedol incorporation regulated the crystallization behavior, thermal transitions, and nanoscale morphology of the copolyesters, producing a rigid–flexible architecture composed of PET-rich ordered domains and Pedol-containing flexible regions. The optimized composition, P(ET-co-Pedol) 6 , maintained WAXD-detectable local ordering while retaining sufficient segmental mobility and melt processability required for film fabrication. In situ variable-temperature SAXS further revealed thermally induced nanoscale structural evolution before the primary DSC crystallization event, suggesting that local ordering or density fluctuation may precede conventional lamellar crystallization in this copolyester system. Consequently, P(ET-co-Pedol) 6 exhibited a tensile strength of 84.2 MPa and an elongation at break of 582.7%, representing increases of 59.7% and 860% relative to neat PET, respectively. Meanwhile, oxygen and carbon dioxide permeabilities were reduced by 63% and 33%, respectively, which is consistent with the combined effects of preserved PET-rich ordered domains, local ordering, film drawing-induced orientation, and increased gas-diffusion tortuosity. Glycolysis–repolymerization further enabled regeneration of the copolyester with approximately 90% tensile-strength retention. These results demonstrate that rigid–flexible segment engineering provides an effective strategy for developing PET-based copolyesters with coupled mechanical toughness, gas-barrier performance, melt processability, and chemical recyclability.
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FOOD RESEARCH INTERNATIONAL
·
2026
·
IF 8.8
Wei Liu,Lin Wang,Kunyi Wang,Xinzhi Liang,Ting Liu,Jingxuan Tan,Xiaoyong Qiu,Jingcheng Hao
Double-layer fibers control gaseous microenvironment, suppressing respiration. • Double-layer fibers possesses high selectivity of CO 2 and O 2 . • The dual mechanism—gas regulation and bioactive—prolongs the quality of fruits. Respiration is the primary driver of postharvest deterioration in highly perishable fruits, as both plant tissues and associated microorganisms rapidly consume available nutrients and accelerate quality loss. Modulating the surrounding gaseous environment is therefore critical for mitigating respiration-the most important factor of driving spoilage. In this study, double-layer fiber films with selective gas permeability were developed to regulate O 2 and CO 2 levels within localized microenvironments. Their asymmetric structure established a mildly hypoxic and CO 2 -enriched atmosphere, achieving a gas selectivity of 11.39 ± 0.88 and effectively lowering respiratory intensity. The fibers also provided antibacterial and antioxidative functions, contributing to reduced microbial contamination and oxidative degradation. When applied to litchi, the films extended the effective commercial shelf life to approximately 9 days and significantly delayed overall spoilage throughout a 15-day evaluation period under controlled storage conditions. Beyond their demonstrated efficacy, these fibers show considerable potential for advancing food preservation strategies, offering meaningful opportunities for more sustainable packaging solutions. Their dual-action mechanism—integrating gas regulation with biological active—positions them as a versatile material platform for addressing spoilage challenges in highly perishable fruits. Download: Download high-res image (89KB) Download: Download full-size image
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危险品化学品经营许可证（带存储）