CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Hongyuan Xi,Song Zhou,Jinxi Zhou
NO is the main precursor of photochemical smog. Since the SCR system of marine diesel engines has many disadvantages, this paper proposes an effective wet method to remove NO from the exhaust gases of marine diesel engines. Experiments were performed in a bubble column reactor to study the absorption of NO using sodium persulfate (Na 2 S 2 O 8 )/urea ((NH 2 ) 2 CO) solutions from a simulated gas stream. The effects of various operating parameters on NO removal were investigated, including reaction temperature, urea concentration, Na 2 S 2 O 8 concentration and the initial pH value of Na 2 S 2 O 8 /urea solutions. The experimental results showed that the NO removal efficiency increased with increasing reaction temperature (25–80 °C) and increasing Na 2 S 2 O 8 concentration (0.01–0.2 mol/L). When the concentration of urea was higher than 0.5 mol/L at 60 °C, 1 mol/L at 70 °C or 2 mol/L at 80 °C, the NO removal efficiency increased with the increase of urea concentration (0.1–4 mol/L). The highest NO removal efficiency was 99.7%, occurring at 80 °C when the concentrations of Na 2 S 2 O 8 and urea were 0.1 mol/L and 4 mol/L, respectively, and the concentration of nitrate was 14.93 mg/L. The optimal urea conditions were well below the legal limit of 60 mg/L. The NO removal efficiency increased with the increase of initial pH value within the herein investigated range of 7–9. All the experimental data showed that the novel system not only achieved effective NO removal efficiency, but also reduced the nitrate in wastewater, which could thus be applied to denitrification of marine engine exhaust gases.
研究领域:
环境工程
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大气污染控制
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化学工程
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海洋工程
·
能源与动力工程
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 49
·42854-42862
·
IF 3.289
He Liu,Aiting Wang,Xu Xu,Mengmeng Wang,Shibin Shang,Shiwei Liu,Jie Song
Cellulose aerogels based on crosslinking of cellulose with 1,4-butanediol diglycidyl ether (BDE) were homogeneously synthesized in NaOH/urea aqueous solution followed by freeze-drying. In the NaOH/urea aqueous solution, cellulose existed in a sodium alkoxide form that could react with the epoxide groups of BDE. The rheological behavior of the cellulose/NaOH/urea aqueous solution showed that the crosslinking reaction occurred immediately once the BDE was added to the cellulose/NaOH/urea aqueous solution at room temperature. The X-ray diffraction (XRD) characterization identified a transition from the crystalline structure of cellulose to an amorphous state of cellulose aerogels with increasing amount of BDE. Elemental analysis revealed the variation in carbon and oxygen elemental percentages in cellulose aerogels caused by the reaction between cellulose and BDE. The porous network of aerogels was observed by scanning electron microscopy (SEM) and the pore size of the aerogels increased as a function of BDE. The water adsorbent ability of aerogels was up to 41 g g−1—even after 30 squeezing–adsorption cycles, the water adsorbent ability was still 37 g g−1.
研究领域:
高分子材料科学
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纳米材料学
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绿色化学
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生物基功能材料
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环境功能材料
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Q.Q. Xiong,J.P. Tu,X. Ge,X.L. Wang,C.D. Gu
Fe 2 O 3 nanospindles assembled with nanoparticles as primary building blocks are directly synthesized by a versatile ionothermal strategy in the choline chloride/urea mixture-based deep eutectic solvent system. The proposed ionothermal protocol is attractive and environmental friendly because choline chloride and urea are both naturally biocompatible compounds. As an anode material for lithium-ion batteries, the resultant Fe 2 O 3 nanospindles show high capacity and good cycle stability (921.7 mAh g −1 at a current density of 200 mA g −1 up to 50 cycles), as well as the excellent rate capability. The good electrochemical performance can be attributed to the nanospindle structure with high sufficient interfacial contact area between the active material and electrolyte, the short diffusion distance of Li ions . The environmentally benign strategy proposed in this study is expected to offer an attractive technique for the ionothermal synthesis of electrochemical energy storage materials .
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
·
无机合成
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 1
·57-65
·
IF 1.093
Liu Wolong,Zhang Jiupeng,Liu Qi,Pei Jianzhong,Zhu Cunzhen,Liu Peng
Micro-damages always occur and accumulate in asphalt pavement materials under the effects of temperature, vehicle loads and other factors during service. Accordingly, self-healing microcapsules could be added into asphalt binder and repair micro-damages to prevent damage extension in
time. In this study, the emulsified rejuvenator and melamine-urea-formaldehyde resin (MUF) were selected as the core and cyst wall materials, respectively, and in-situ polymerization method was applied to synthesize the novel microcapsules. The effects of emulsifier dosage and curing
time were revealed on the particle size, dispersion, surface morphology and coating properties, and the optimum process parameters were determined for microcapsules. Then, the micro morphology, molecular structure, and thermal stability were further investigated to determine the optimal preparation
of the microcapsules. Finally, the linear amplitude sweep (LAS) test was performed to evaluate the self-healing efficiency of the asphalt binder with different dosages of prepared microcapsule, and the optimal dosage of microcapsules was determined as 0.5%.
研究领域:
材料科学
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土木工程
·
化学工程
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DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2024
·
IF 2.3
Li Jia-Kai,Li Xiang-Yu,Xu Zhong-Ning,Sun Jing,Lin Shu-Juan,Qin Qiu-Pei,Liu Bin-Wen,Wang Ming-Sheng,Guo Guo-Cong
Reduction of nitric acid reaction (2NO + HNO 3 + 3CH 3 OH → 3CH 3 ONO + 2H 2 O) can convert by-product nitric acid into raw material methyl nitrite in the coal to ethylene glycol (CTEG) technology. This not only realizes the efficient recycling of nitrogen resources but also plays a crucial role in mitigating environmental pollution. Despite being a promising catalyst, the Pd/C catalyst face challenges due to its high metal loading, substantial loss rate, and consequent issues of poor stability, presenting obstacles in meeting industrial requirements. To address this issue, a defect strategy has been employed to develop a low-loaded 0.3% Pd/NC catalyst with robust metal-support interaction, resulting in a significant enhancement of catalyst stability. Remarkably, even after undergoing five cycles, the catalyst maintains a high nitric acid conversion rate of 90%. This improved performance can be attributed to the strong metal-support interaction driven by electron transfer from the nitrogen-doped carbon (NC) substrate to the Pd nanoparticles evident in the Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma (ICP) results. This interaction effectively suppresses the leaching of the active Pd nanoparticles, leading to significantly enhanced stability and a noticeable reduction in the loss rate. Raman spectrum and electron paramagnetic resonance (EPR) results can further reveal that the increase in the defect density lead to the strong metal-support interaction after nitrogen doping (pyridinic-N-dominated). These findings highlight the significant potential of the Pd/NC catalyst and its applicability in expediting the industrialization process of catalyst. Graphical Abstract
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高影响因子
CARBON
·
2025
·
IF 11.6
Hongsheng Liang,Tian Hou,Tiancheng Liu,Shengchong Hui,Zhaoyang Hou,Zhen Wang,Bin Shi,Limin Zhang,Hao Shen,Hongjing Wu
Comprehensively understanding the role of interfacial engineering in tailoring dielectric response is essential for the development of next-generation electromagnetic wave (EMW) absorbers. Rare-earth oxides, with their flexible valence states and localized 4f orbitals, hold great potential to mediate interfacial charge transfer and polarization, yet the electromagnetic loss mechanisms underlying such effects remain unclear. Here, we demonstrate a rare-earth oxide–regulated interfacial engineering strategy, where the incorporation of CeO 2 into NiCo 2 O 4 constructs abundant heterointerfaces with dynamic valence states. Such CeO 2 -induced interfacial polarization markedly strengthens dielectric response and facilitates impedance matching, thereby surpassing the limitations of single-phase components. Dielectric analysis reveals that polarization loss dominates (>88 %) within the absorption band, while conduction loss plays a secondary role. The results show that interfacial charge redistribution driven by Ce 3+ /Ce 4+ redox flexibility, which creates abundant interfacial polarization centers and enhances relaxation. As a result, the optimized NiCo 2 O 4 /CeO 2 –T3 delivers outstanding EMW absorption, achieving a broad effective absorption bandwidth of 6.37 GHz at 2.00 mm and reflection loss of −60.09 dB at 2.20 mm (>99.99 % attenuation). This study establishes rare-earth oxide–enabled interfacial engineering as a powerful paradigm for amplifying interfacial polarization and guides the rational design of high-performance, lightweight EMW absorbers.
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PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Xin Liu,Lu Jiang,Qiushi Li,Yan Dong,Yifan Lv,XinYi Li,LongXu Liu
Corrosion of carbon steel can result in serious damage, limiting its application in various fields. Considerable protective coatings have been proposed, but they are limited by difficulties in repairing and early warning of coating damage and local metal corrosion. Herein, a dual-functional smart anti-corrosion coating with integrated self-healing and self-warning capabilities was designed and fabricated. Firstly, the MBT + CVL@Fe 3 O 4 composite was prepared by loading corrosion inhibitor 2-mercaptobenzothiazole (MBT) and fluorescent probe crystal violet lactone (CVL) into mesoporous Fe 3 O 4 microspheres. The system demonstrated a stimulus-responsive release of MBT, providing effective corrosion inhibition for Q235 steel. Subsequently, the MBT + CVL@Fe 3 O 4 composite was incorporated as a functional filler into a shape memory epoxy (EP) coating. The results showed that the optimum addition amount of filler was 2 wt% because the MBT + CVL@Fe 3 O 4( 2% ) /EP coating presented the smoother surface, maximum water contact angle, and impedance value under damaged conditions. Based on the photothermal effect of Fe 3 O 4 -based filler combined with the shape memory effect of epoxy resin, when irradiated for 60 s, the surface temperature of the scratched MBT + CVL@Fe 3 O 4( 2% ) /EP was about 55 °C, exceeding its glass transition temperature ( T g ≈ 49.5 °C). Consequently, the scratch width was markedly reduced, demonstrating effective self-healing of the external coating damage. Moreover, when the coating damage even caused local corrosion of the metal substrate and changes in the pH of the corroded area, the corrosion inhibitor MBT was responsively released, forming a protective film layer to protect the metal substrate from further degradation. The low-frequency impedance |Z| 0.01 Hz values of scratched pure epoxy coating (EP), scratched MBT + CVL@Fe 3 O 4( 2% ) /EP and photothermal healed scratched MBT + CVL@Fe 3 O 4( 2% ) /EP immersed in 3.5 % NaCl solution for 120 h were 4.98 × 10 4 Ω·cm 2 , 4.78 × 10 5 Ω·cm 2 and 1.31 × 10 6 Ω·cm 2 , respectively, which fully illustrated the dual repair function of the coating. Additionally, the CVL loaded in the filler provided the fluorescence color rendering performance of the coating. Under the irradiation of an ultraviolet lamp, the bright blue fluorescence signal can be displayed at the coating damage site, effectively predicting the coating damage. Moreover, CVL can produce fluorescence quenching when localized corrosion occurs on the metal substrate, warning of early corrosion. These results prove the self-warning performance of the anti-corrosive coating.
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高影响因子
FUEL
·
2025
·
IF 7.5
Xianglei Cao,Ziyi Wang,Liugen Zhang,Changyan Guo,Meng Wang,Jia Guo,Yanfang Ma,Jide Wang
Methanol, as a hydrogen carrier, offers high hydrogen content and production advantages while significantly reducing the storage and transportation costs of hydrogen energy. This study aims to investigate the distribution differences and pathways of gas–liquid products during methanol decomposition catalyzed by four photocatalysts (CdS, ZnIn 2 S 4 , g-C 3 N 4 and TiO 2 ) surface-loaded with precious metal Pt. The results demonstrate that the order of hydrogen production amounts is as follows: TiO 2 -Pt > g-C 3 N 4 -Pt > ZnIn 2 S 4 -Pt > CdS-Pt, with TiO 2 -Pt achieving 67.6 mmol/g within 6 h. In addition to hydrogen gas, various gas products such as CH 4 , CO, C 2 H 4 and C 2 H 6 are also generated in each catalytic system. The distribution of these gas products closely correlates with the catalyst type used. Metal sulfide systems tend to produce CO alongside hydrogen generation, while the carbon-containing products include unsaturated olefin C 2 H 4 in addition to C 2 H 6 , without the formation of MF (methyl formate). Conversely, g-C 3 N 4 -Pt and TiO 2 -Pt systems primarily yield CH 4 as a carbon-containing gas product while exclusively containing C 2 H 6 and have the capability to synthesize MF. The reaction pathways for methanol decomposition in each system were deduced through in-situ infrared analysis and verified by DFT theoretical calculations, elucidating the potential correlation between catalyst types and product profiles. Different catalysts exhibit distinct adsorption capacities towards vary intermediate species during catalysis process, leading to their accumulation or continuous conversion on the catalyst surface, thereby resulting in diverse product yields at distinct stages. These findings provide valuable insights for designing photocatalytic methanol cracking processes aiming at high-purity H 2 generation or improving selectivity towards target products.
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高影响因子
Journal of Materials Chemistry A
·
2025
·Vol. 13
·期 47
·40842-40849
·
IF 9.5
Yumeng Hu,Yulin Yao,Zhenheng Diao,De Sun,Yuanyuan Dong
The catalytic performance of TS-1 zeolites in selective oxidation reactions is strongly influenced by both the TiO6 concentration and specific surface area. However, simultaneously optimizing these two critical factors remains a significant challenge. Herein, a biuret-assisted hydrothermal synthesis strategy was developed to fabricate hierarchical TS-1 zeolites with high TiO6 concentration and enhanced specific surface area. The interaction between the amide groups of biuret and Ti monomers promoted the formation of TiO6 during crystallization, while the confinement effect of biuret facilitated the construction of mesopores. The resulting hierarchical TS-1 exhibited good catalytic activity and stability towards 1-hexene epoxidation and oxidative desulfurization reactions, where the conversion was 1.41 and 3.36 times higher than that of conventional TS-1, respectively. This work provides a facile approach for designing high-performance TS-1 catalysts by dual regulation of active sites and porosity.
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高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 10
·1-11
·
IF 5.3
Gu Yingqiu,Fang Puhao,Chen Yu,Xie Tianhua,Yang Guohai,Qu Lulu
A miniature multi-channel surface-enhanced Raman scattering (SERS) sensor based on polydimethylsiloxane (PDMS) is constructed to achieve rapid delivery of polluted water and specific identification of multiple components. Hg 2+ , organic pollutants, and sodium nitrite are successfully identified by the multi-channel SERS sensor using Cy5, cyclodextrin, and urea in the corresponding detection area. This multi-channel sensor exhibits excellent sensitivity and specificity, with detection limits of 3.2 × 10 −10 M for Hg 2+ , 1.0 × 10 −8 M for aniline, 6.9 × 10 −9 M for diphenylamine, 9.1 × 10 −8 M for PCB-77, and 7.5 × 10 −9 M for pyrene, and 5.0 × 10 −7 M for sodium nitrite. Compared with traditional analysis techniques, this method exhibited excellent recovery for the water pollutants ranging from 82.1 to 115.8%. The PDMS-based microchannel allows for simultaneous and rapid identification of multiple environmental pollutants, offering a portable detection method for emergency testing of environmental pollutants and routine determination of water pollutants. Graphical Abstract
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PubMed
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Yanting Dou,Yu Gao,Bobo Bai,Jiqi Zheng,Shuxia Bao,Cheng Dong,Hongjiang Li,Qiuhui Bu,Dongling Ma,Fu Ding,Yaguang Sun,Zhenhe Xu
Design and conception of a competent photocatalyst for water splitting and photodegradation are critical for energy transformation and environmental remediation. Herein, for the first time, we demonstrated that mixed redox-couple-involved bornite phase Cu5FeS4 could act as an efficient and robust cocatalyst for graphitic C3N4 (g-C3N4), which enables the achievement of considerably boosted visible-light photocatalytic activities in both H2 evolution and pollutant degradation reactions. Under visible-light irradiation, the optimized g-C3N4/Cu5FeS4 heterojunction presented a remarkably increased H2 production rate of 27.92 μmol g–1 h–1 (without involving any noble metals) and methyl orange (MO) photodegradation rate of 2.18 min–1 g–1 compared with those of g-C3N4 and Cu5FeS4. To be more specific, these rates are ∼15 and 3 times higher than those of pure g-C3N4 in these two reactions, where the pure Cu5FeS4 did not show any activities. The enhanced photocatalytic performance was identified to be due to the presence of a “mixed redox-couple” of Cu(I)–S–Fe(III), which enhanced charge separation efficiency between g-C3N4 and Cu5FeS4, consequently facilitating the overall reaction kinetics. Overall, our work not only demonstrates the immense potential of using mixed redox-couple-involved bornite phase Cu5FeS4 as the cocatalyst in photocatalysis but also expedites the designing and discovering of novel photocatalytic systems based on the proposed concept of the mixed redox-couple.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Guanhua Zhang,Shengjie Xia,Huimin Li,Hao Du,Tiantian Li,Yongyong Cao,Yue Meng,Juan Wang,Chenglin Zhong,Woon-Ming Lau
The synergistic treatment of pollutants in water by radical and non-radical pathways based on photo-like Fenton-activated peroxydisulfate (PDS) has received much attention from researchers. However, clarifying the structure–activity relationship between the photocatalyst structure and the dual-pathway degradation mechanism is difficult. Herein, the flower-like nickel–iron layered double hydroxide containing oxygen vacancy (NiFe-LDH-V O ) was constructed by dual-hydrothermal method. The NiFe-LDH-V O /PDS/light system exhibited excellent degradation performance (93.1%) for norfloxacin (NOR). Notably, the apparent rate constant exceeded pristine NiFe-LDH by 2.6 times. The results of experiments, characterization and DFT calculations indicated that the enhanced degradation activity was attributed to the dual-pathway of radical and non-radical induced by V O on the catalyst surface. V O can not only improve the migration and separation efficiency of photogenerated carriers, which ensures the energy base of PDS activation, but also act as the active site of both radical pathway and non-radical pathway. In particular, V O can change the adsorption conformation of PDS, which enhances the adsorption of PDS on the catalyst and significantly reduces the energy barriers of the two activation pathways of PDS. The reasonable pathways for NOR degradation were proposed based on HPLC-MS and DFT calculations. In addition, the toxicity analysis of intermediates indicated lower developmental toxicity and mutagenicity compared to NOR. The present work provides innovative insights into the study of photocatalysts with dual degradation pathways and their mechanistic elaboration.
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