Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Ruirui Qi,Manfen Liang,Weisong Feng,Weijie Zhou,Xiangyang He,Mei Wu,Haimei Xu,Zhichao Miao
At present, the global community is confronted with critical challenges arising from excessive CO 2 emissions, thereby underscoring the importance of CO 2 conversion and utilization. The electrocatalytic CO 2 reduction (ECR) to formate has attracted considerable attention as an economically viable pathway. However, the current ECR catalyst generally suffers from low catalytic performance and complex preparation processes, necessitating the development of simpler synthesis strategies suitable for practical large-scale applications. In this work, a facile and scalable catalyst preparation method suitable for large-scale production was proposed. Specifically, a series of mesoporous In-CeZr catalysts were prepared through a one-step evaporation-induced self-assembly approach. In addition, as important influence factors for catalysts, the Ce/Zr molar ratios and In 2 O 3 contents are carefully controlled, and the mesoporous structure and existing states of In species are detailedly investigated by different techniques. Among all these catalysts, the 10In-CeZr50 demonstrates excellent activity and stability for CO 2 electroreduction to formate, with a FE formate % as high as 95% and a current density of 130 mA cm −2 at −1.17 V vs. RHE, and retains its stability even after long time ECR test for 60 h. This work presents a novel catalyst synthesis strategy for ECR to formate production.
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MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Rumeng Gao,Lin Wang,Yayu Feng,Yunfei Liu,Lili Cao,Kuilin Deng
The red fluorescent polymers are indispensable but rare materials in the bio-imaging, probe and optoelectronic device fields due to the large penetration depth in tissues, high resistance to photobleaching, low toxicity and high luminescence efficiency. In this study, we designed an O/N/S-containing five-membered thiazolidinone as a “potential chromophore” to embed in macromolecular chains according to cluster-triggered emission (CTE). A series of polythiazolidinones (PTDs) were synthesized by one-step MALI polymerization using dialdehyde, diamine, and thioglycolic acid in the experiment. As expected, PTDs showed the enhanced red fluorescence emission at 600–620 nm with excitation-dependent fluorescence (EDF) due to the overlap of intramolecular and intermolecular electron clouds leading to the narrowed energy gap between the excited and ground states. Notably, PTD-A selectively recognized and detected Co 2+ ions even in the presence of 12 other metal ions and 10 anions with the detection limits of as low as 0.24 μM. Furthermore, the quenching mechanism of Co 2+ to PTD-A is attributed to static quenching caused by the coordination of Co 2+ ions with a coordination ratio of 1:1. In addition, the rapid on-site determination of Co 2+ in the real samples was achieved by the combination between PTD-A and smartphones without professional equipment. In brief, the successful preparation of polythiazolidinones provides a constructive reference for the molecular design of red light-emitting materials and their potential applications.
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POWDER TECHNOLOGY
·
2025
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IF 4.6
Junchao Wang,Yunfei Zhang,Yulei Li,Lijun Deng,Yijun Cao,Guosheng Li
The flotation efficiency of fine molybdenite remains low because of the strong hydrophilicity and electronegativity of the edges and the low probability of bubble-particle collision. In this work, an effective approach has been proposed to enhance the flotation of fine molybdenite using positively charged CO 2 nanobubbles (NBs) based on electrostatic driving and NB bridging effects. The positively charged CO 2 NBs with an average size of approximately 210 nm and a zeta potential of about 9 mV were prepared using a micro-nano bubble generator based on circulating countercurrent and multiphase vortex gas-liquid shearing technology. The flotation test results showed that compared with conventional flotation, the introduction of NBs could significantly improve the flotation efficiency of fine molybdenite, and the strengthening effect of CO 2 NBs on the flotation of fine molybdenite was better than that of air NBs. The interaction mechanism was illustrated through contact angle measurements, turbidity measurements, zeta potential measurements, hydrophobic agglomeration behavior analysis and fractal dimension analysis. On one hand, positively charged CO 2 NBs could be adsorbed onto the basal and edge surfaces through hydrophobic attraction and electrostatic attraction, respectively, to enhance the overall hydrophobicity of molybdenite particles, facilitate hydrophobic agglomeration of particles, and thereby increase the apparent size of particles and the probability of collision between particles and macro-sized bubbles. On the other hand, CO 2 NBs could boost the attachment between particles and macro-sized bubbles through bridging effect, thereby significantly improving the flotation efficiency of fine molybdenite. This research has important theoretical and practical value in expanding the enhanced methods for the flotation process of fine molybdenite
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VACUUM
·
2025
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IF 3.9
Zhuo Li,Huiling Du,Nan Kong,Na Cao,Kemeng Hu,Lan Yang,Xian Du
Carbon dioxide conversion represents a highly promising carbon reduction strategy, and photocatalytic conversion technology, characterized by greenness, non-toxicity, and sustainability, holds significant importance. However, enhancing CO 2 adsorption on photocatalysts and improving charge carrier separation efficiency remain substantial challenges. In this study, based on MIL-101, we designed a highly interconnected TiO 2 @MIL-101 bifunctional heterojunction by in-situ compositing TiO 2 on its surface through Ti-O-Cr bonding, aiming to achieve in-situ adsorption and conversion of carbon dioxide. This composite photocatalyst exhibits enhanced photocatalytic activity, with an average CO production rate of 35.39 μmol h −1 g −1 and a CH 4 production rate of 13.81 μmol h −1 g −1 . Compared to unmodified MIL-101 (Cr), these values are increased by 1.25-fold and 2.8-fold, respectively. Experimental results combined with DFT calculations demonstrate that the porous structure and high specific surface area of MIL-101 facilitate the diffusion of CO 2 on the photocatalyst surface and improve interfacial reaction kinetics. The synergistic effect between Ti-O-Cr bonds and the built-in electric field within the highly interconnected heterojunction accelerates the directional transfer of charge carriers at the heterointerfaces, effectively promoting the catalytic conversion of carbon dioxide.
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APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Ruiqi Zhang,Yanyan Zhang,Kang Wang,Xitao Wang,Baoquan Zhang
In this work, the heterostructure between Cu particles and ZnFe-LDH semiconductor with lantern shape was constructed by reducing the ternary CuZnFe-LDH using H 2 , and the effects of Cu loading and the formation of heterojunction on photocatalytic CO 2 reduction to CO and CH 4 were investigated. The results showed that the hollow and layer-stacking structure of the catalyst was beneficial to the light utilization, adsorbing and activating of carbon dioxide. The Cu cations could enter into the lattice of ZnFe-LDH to form a ternary CuZnFe-LDH, which could be reduced to Cu particles with smaller size by H 2 and resulting in the heterostructure between Cu and ZnFe-LDH. The loading of Cu particles can significantly enhance the light absorption, photogenerated carriers transfer rate and separation efficiency of ZnFe-LDH, thus improving photocatalytic activity. As expected, Cu 1.6 ZnFe-R catalyst exhibited the highest catalytic activity with CO yield of 45.35 μmol·g cat −1 ·h −1 and CH 4 yield of 39.33 μmol·g cat −1 ·h −1 , which were 2.81 and 6.19 times higher than those of ZnFe-LDH, respectively. Meanwhile, Cu particles acted as electron-rich centers and CO 2 adsorption sites can noticeably improve the CH 4 selectivity and inhibit H 2 production. The Cu 1.6 ZnFe-R catalyst exhibits the highest CH 4 electron-based selectivity of 65.17 %, the highest electrons consumed of 482.80 μmoL·g cat −1 ·h −1 for CO 2 reduction and the lowest H 2 electron-based selectivity of 16.04 %.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Guangping Zhou,Hao Huang,Bo Yang,Xuan Zhou,Huoyan Jiang,Da Zhang,Wanli Zhang,Shaoqu Xie
A carbon-doped Cu/Al 2 O 3 catalyst was engineered using glucose, fructose, and sucrose as carbon sources. Controlled carbon deposition and calcination exposed acidic sites, thereby optimizing Cu dispersion, enhancing metal–support interaction (SMSI), and enriching surface hydroxyls, which collectively facilitated CO 2 hydrogenation via HCOO ∗ and ethyl acetate intermediates. Structural characterization showed that the preferential exposure of the Cu (111) crystal face further enhanced the catalytic activity. Performance tests showed that the catalyst exhibited a methanol yield of 12 % and a selectivity of 91 % in the CO 2 hydrogenation to methanol reaction, which was attributed to the improved Cu dispersion, the enriched metal Cu phase, and the presence of acidic sites. This study provides new ideas for the rational design of Cu-based catalysts and proposes a scalable green synthesis method for methanol.
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CARBON
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2025
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IF 11.6
Lianzhong Shen,Lin Wang,Zhouwei Li,Yu Ye,Qizhou Dai
Atomically dispersed metal-nitrogen-carbon (M-N-C) catalysts are one of the more popular materials for electrochemical reduction of CO 2 to fuels and chemicals. Still, their Faraday efficiency and current density are generally low due to the single coordination environment and defect sites. Heteroatom doping has been demonstrated to increase the degree of defects in the material, improve the electron distribution at the single atomic sites, and enhance the catalytic performance. In this study, we prepared an S-doped single-atom catalyst called FeS@PC by a simple high-temperature pyrolysis method for efficient electroreduction of CO 2 to CO, with a maximum CO Faraday efficiency of 97.0% at -0.6 V vs. RHE potential. S atoms doped in the second-shell can change the electron distribution on the Fe-N 4 sites and accelerate the electron transfer during the electrochemical CO 2 reduction reaction (CO 2 RR). Through in situ ATR-FTIR characterization and kinetic experiments, it is found that the doped S can also promote the dissociation of H 2 O, provide sufficient protons for the conversion of CO 2 to *COOH, and promote the rate of CO conversion.
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Processes
·
2024
·Vol. 12
·期 11
·2315
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IF 2.8
Yang Ge,Haihong Chen,Rui Qin,Haiyuan Yao,Ting Huang,Xin Lv,Huiyong Liang,Shi Shen
During marine oil–gas extraction, significant amounts of carbon dioxide (CO2) gas are often produced. Effectively separating these associated CO2gases during extraction has become a critical technical challenge. Therefore, this paper aims to enhance the efficiency of CO2hydrate-based capture technology and conduct relevant research. The goal is to increase the driving force for hydrate formation by combining the traditional thermodynamic additive TBAB with pressure modulation and to improve the hydrate formation rate through the use of multiple kinetic promoters. This paper presents the initial investigation into the effect of the thermodynamic accelerator tetrabutylammonium bromide (TBAB) on the characteristics of CO2hydrate formation. The promotion effects of TBAB solutions with varying mass concentrations (3%, 5%, 7.5%, 10%) and reaction pressures (3 MPa, 4 MPa) were subjected to a systematic analysis, and the optimal conditions were identified as 4 MPa and a 5 wt% TBAB concentration. Subsequently, the impact of combining TBAB with kinetic promoters (SDS, nano Al2O3, L-methionine, L-leucine) on CO2hydrate generation characteristics was further investigated. In this paper, the effect of a single promoter on the generation characteristics of CO2hydrate was investigated, and the efficient carbon trapping ability of the complex promoter was verified, which provides theoretical support for the application of CO2trapping technology using the hydrate method.
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Molecular Catalysis
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2025
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IF 4.9
Liangliang Zhong,Wendong Wang,Hui Zheng,Xiaoyan Zeng,Fangsong Guo,Longmei Shang,Guowu Zhan
The electrochemical reduction of CO 2 (CO 2 RR) to formate is a promising strategy for carbon utilization and renewable energy storage. Herein, we develop a Cu 3 Bi 7 bimetallic nanosheet catalyst via an in situ topotactic transformation of BiOBr-CuBr heterojunctions. The resulting Cu 3 Bi 7 nanosheets feature abundant edge-active sites, enhanced electron transfer kinetics, and improved CO 2 adsorption, collectively boosting catalytic performance. Structural characterization confirms the coexistence of Cu and Bi phases in Cu 3 Bi 7 nanosheet, with strong electronic interactions optimizing the electronic structure, and mechanistic analysis indicates that the bimetallic synergy enhances CO 2 activation and stabilizes key intermediates, leading to superior selectivity and reaction kinetics. Electrochemical studies demonstrate that Cu 3 Bi 7 achieves a high formate Faradaic efficiency of 90 % at a current density of 120 mA cm -2 in a flow cell, maintaining exceptional stability for 90 h without performance degradation. This work provides a scalable strategy for designing efficient CuBi bimetallic catalysts and advances the development of CO 2 RR technology for practical applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Fan Liu,Yao Shen,Li Shen,Yuchi Zhang,Weiqi Chen,Xiaoxiang Wang,Qiaoli Wang,Sujing Li,Shihan Zhang,Wei Li
The main disadvantage of commercial absorption solution for CO 2 capture from flue gas is extensive energy consumption. A novel amino-functionalized ionic liquid (AFIL) organic solution of tetraethylene pentamine 2-methylimidazolium/N-propanol/ethylene glycol ([TEPAH][2-MI]/NPA/EG) is considered as a promising candidate absorption system because of its efficient CO 2 capture performance and low energy consumption. The thermodynamics and kinetics studies are very essential for evaluating the absorbent and its potential of future practical industrial application. In this work, the performance in these two aspects of [TEPAH][2-MI]/NPA/EG solution were investigated. The regeneration energy consumption was 2.98 GJ·t −1 CO 2 , which was 21.6% lower than that of benchmark monoethanolamine (MEA) aqueous solution, and the energy saving advantage was embodied in sensible heat and latent heat. Kinetic analysis showed that chemical reaction of CO 2 absorption into [TEPAH][2-MI]/NPA/EG solution took place in the pseudo-first-order reaction. The reaction rate constant and enhancement factor increased with the increase of absorption temperature, while those showed a decreasing trend with the increase of absorption loading. The relation between the second-order rate constant and temperature was expressed as k 2 = 5.6192 × 10 8 exp - 3111.6 T , and the activation energy was further calculated as 25.87 kJ·mol −1 . Compared with those of MEA and several traditional ionic liquid solutions, these parameters indicated a stronger reaction ability of the novel system. Moreover, the mass transfer resistance of gas and liquid phase changed constantly during the absorption process, and the dominant role of mass transfer resistance gradually changed from the gas phase to liquid phase. The thermodynamics and kinetics of CO 2 capture revealed that the [TEPAH][2-MI]/NPA/EG solution had an excellent application potential in the future.
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CHINESE JOURNAL OF CATALYSIS
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2022
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IF 12.92
Anxiang Guan,Yueli Quan,Yangshen Chen,Zhengzheng Liu,Junbo Zhang,Miao Kan,Quan Zhang,Haoliang Huang,Linping Qian,Linjuan Zhang,Gengfeng Zheng
The electrocarboxylation reaction is an attractive means to convert CO 2 into valuable chemicals under ambient conditions, while it still suffers from low efficiency due to the high stability of CO 2 . In this work, we report a double activation strategy for simultaneously activating CO 2 and acetophenone by silver-doped CeO 2 (Ag-CeO 2 ) nanowires, featuring as an effective electrocatalyst for electrocarboxylation of acetophenone with CO 2 . Compared to the Ag foil, Ag nanoparticles and CeO 2 nanowires, the Ag-CeO 2 nanowire catalyst allowed to reduce the onset potential difference between CO 2 and acetophenone activation, thus enabling efficient electrocarboxylation to form 2-phenyllactic acid. The Faradaic efficiency for producing 2-phenyllactic acid reached 91% at −1.8 V versus Ag/AgI. This double activation strategy of activating both CO 2 and organic substrate molecules can benefit the catalyst design to improve activities and selectivities in upgrading CO 2 fixation for higher-value electrocarboxylation.
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CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Yingchao Hu,Wenqiang Liu,Jian Sun,Mingkui Li,Xinwei Yang,Yang Zhang,Minghou Xu
A novel inert solid support of Nd 2 O 3 was introduced to enhance the cyclic carbonation/calcination performance of CaO-based sorbents. CaO particles were incorporated into Nd 2 O 3 by a wet-mixing method, using three organometallic precursors (OMPs) as calcium precursors and neodymium(III) acetate hydrate as inert support precursor. For comparison, CaO-based sorbents directly produced from precursors and the naturally occurring sorbent (limestone) were also investigated. FSEM and EDAX results revealed that the ultrafine active specie of CaO particles were homogeneously dispersed into Nd 2 O 3 inert support. As a result, an improved durability and higher carbonation conversion were observed owing to the retarded sintering and the delayed diffusion controlled stage respectively for the sorbents investigated. The performance of the synthetic sorbents also relies on the precursor. When calcium dl -lactate pentahydrate (CaL) was used to incorporate CaO into the inert support Nd 2 O 3 , the highest conversion and best durability were obtained. The effect of calcination temperatures on the sorbent durability was also investigated. Under a relatively severe calcination temperature of 900 °C, a high conversion of about 67% were obtained after 100 carbonation/calcination cycles for a sorbent synthesized from calcium dl -lactate pentahydrate (CaL) and neodymium(III) acetate hydrate. When the calcination temperature was changed to a mild one of 800 °C, a significantly high conversion (>92.5%) was maintained over 100 carbonation/calcination cycles. Besides, no apparent capacity decline was observed for the sorbents after granulation.
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