RSC Advances
·
2013
·Vol. 3
·期 41
·18803-18810
·
IF 2.562
Yue Liu,Jie Liu,Weiyuan Yao,Wanglai Cen,Haiqiang Wang,Xiaole Weng,Zhongbiao Wu
In this paper, an infrared study has been performed on CO2 adsorption over polyethylenimine (PEI) functionalized protonated titanate nanotubes (PTNTs) prepared by a simple wet impregnation method. It was found that PTNTs had a large amount of acidity sites, which had strong interaction with the amino groups of the loaded PEI. This interaction could lead to good dispersion of PEI molecules, resulting in good performance in adsorption capacity, amine efficiency and adsorption kinetics. Both weakly and strongly adsorbed CO2 species formed under CO2 exposure, which were attributed to hydrogen-bonded species and carbamate groups, respectively. The existence of strong surface acidity increased the proportion of weakly adsorbed CO2 on the protonated amine species, which was beneficial to the adsorption–desorption cyclic performance. Furthermore, it was confirmed that the interaction between the support surface and amine also resulted in the superior thermal stability of amine-modified sorbents. Overall, our results suggested that suitably tuning surface acidity of the support could effectively facilitate CO2 adsorption.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Jinfeng Zhang,Junwei Fu,Kai Dai
Photocatalytic reduction of CO 2 into valuable fuels is one of the potential strategies to solve the carbon cycle and energy crisis. Graphitic carbon nitride (g-C 3 N 4 ), as a typical two-dimensional (2D) semiconductor with a bandgap of ∼2.7 eV, has attracted wide attention in photocatalytic CO 2 reduction. However, the performance of g-C 3 N 4 is greatly limited by the rapid recombination of photogenerated charge carriers and weak CO 2 activation capacity. Construction of van der Waals heterostructure with the maximum interface contact area can improve the transfer/seperation efficiency of interface charge carriers. Ultrathin metal antimony (Sb) nanosheet (antimonene) with high carrier mobility and 2D layered structure, is a good candidate material to construct 2D/2D Sb/g-C 3 N 4 van der Waals heterostructure. In this work, the density functional theory (DFT) calculations indicated that antimonene has higher carrier mobility than g-C 3 N 4 nanosheets. Obvious charge transfer and in-plane structure distortion will occur at the interface of Sb/g-C 3 N 4 , which endow stronger CO 2 activation ability on di-coordinated N active site. The ultrathin g-C 3 N 4 and antimonene nanosheets were prepared by ultrasonic exfoliation method, and Sb/g-C 3 N 4 van der Waals heterostructures were constructed by self-assembly process. The photoluminescence (PL) and time-resolved photoluminescence (TRPL) indicated that the Sb/g-C 3 N 4 van der Waals heterostructures have a better photogenerated charge separation efficiency than pure g-C 3 N 4 nanosheets. In-situ FTIR spectroscopy demonstrated a stronger ability of CO 2 activation to *COOH on Sb/g-C 3 N 4 van der Waals heterostructure. As a result, the Sb/g-C 3 N 4 van der Waals heterostructures showed a higher CO yield with 2.03 umol g −1 h −1 , which is 3.2 times that of pure g-C 3 N 4 . This work provides a reference for activating CO 2 and promoting CO 2 reduction by van der Waals heterostructure.
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Journal of Physical Chemistry Letters
·
2023
·
IF 5.7
Qiang Huang,Chengfan Fu,Yangyi Shen,Haowen Wang,Zhengben Wu,Zhiyu Liang,Changqing Tian,Daofu Wu,Fei Qi,Yayun Pu,Nan Zhang,Manjing Wang,Xiaosheng Tang
Although dielectric barrier discharge (DBD) plasma is a promising technique for CO2 conversion, realizing CO2-to-alcohol is still challenging via the use of H2O. Herein, for the first time, efficient CO2 conversion was achieved via the synergism between the Cs2SnCl6 photocatalyst and DBD plasma assisted by H2O. The CO2 conversion ratio of plasma photocatalysis was 6.5% higher than that of only the plasma and photocatalysis, implying that the synergism of plasma catalysis and photocatalysis was achieved. Furthermore, the DBD plasma assisted by the Cs2SnCl6 photocatalyst could convert CO2 and H2O to CO and a small amount of methanol and ethanol. The CO2 conversion ratio was enhanced by 50.6% in the presence of H2O, which was attributed to the improvement of charge transfer due to the increased electrical conductivity of the photocatalyst surface during plasma discharge. This work provides a new idea for developing an efficient system for CO2 utilization.
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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2024
·Vol. 50
·期 13
·10327-10344
·
IF 2.6
Xu Ruifeng,Wang Shuoshi,Guo Ping,Hukuang Haoxiang,Yuan Na
The CO 2 -WAG injection method proposed for unconventional tight oil reservoirs has been successfully applied in field. However, for water-sensitive tight oil reservoirs, there is a lack of research focusing on the displacement mechanisms and effects of WAG injection at the pore scale. And the gap between nuclear magnetic resonance (NMR) and computerized tomography (CT) scanning technologies is not well explored. This study integrated deuterium oxide-shielded NMR and contrast agent (n-butane iodide and lead iso-octanoate mixture) enhanced micro-CT to study the immiscible CO 2 -WAG mechanisms for water-sensitive tight oil. The aim is to investigate the microscopic distribution and displacement mechanisms of residual oil after CO 2 flooding and WAG injection in water-sensitive cores. Experimental results showed that NMR experiments and CT experiments identified the microscopic distribution of oil at different injection stages successfully. The contrast agent, despite its similar viscosity ratio, had poor representativeness in other properties, leading to significant differences in the microscopic fluid distribution results compared to NMR experiments. The primary WAG flood mechanism observed was that CO 2 dispersed oil droplets, with most being displaced out of the pores, while water played a mobility control role by blocking large pores. However, due to water sensitivity, medium and small pores also experienced blockage, making the effect of WAG injection after CO 2 flooding not significant. In the NMR experiment, the final recovery of core 6–1 after WAG injection was 64.71%. In the CT scan experiment, due to the smaller volume of the microcore, the water sensitivity effect was relatively weaker, and under the stronger influence of the capillary end effect, the final recovery reached 76.91%. In the five sets of long-core experiments, by controlling the gas–water ratio and slug size, the recovery ranged from 56.51 to 64.04%. The core flood experiments validated the representativeness of the microscopic experiments. And for water-sensitive tight oil reservoirs, controlling the volumes of water and CO 2 during the WAG injection process is crucial.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Wei Wang,Zhi Yun,Zhg Tang,Xia Gui
The binary vapor–liquid equilibrium data of CO2 in ethyl butyrate, diethylene glycol diethyl ether, and isobutyl acetate were determined up to 333.15 K and 10 MPa and an improved apparatus based on the static-analytic method has been developed for fast determinations of VLE data. Then, the total pressure PE, CO2 mole fraction x1 in liquid-phase, and CO2 mole fraction y1 in vapor-phase at the equilibrium state were directly obtained by gas chromatography. The experimental data were correlated with a modified Patel–Teja equation of state (PT EOS) combined with the traditional van der Waals one-fluid mixing rules, and it was found that there was a good conformity between experiment and model calculation.
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ANALYTICAL CHEMISTRY
·
2016
·
IF 5.886
Hongbo Yuan,Yibing Fan,Chengfen Xing,Ruimin Niu,Ran Chai,Yong Zhan,Junjie Qi,Hailong An,Jialiang Xu
Detection of carbon dioxide (CO2) is of fundamental importance in diverse applications ranging from environmental analysis to agricultural production. In this work, a hybrid probe based on guanidinium-pendent oligofluorene (G-OF) and water-soluble conjugated polythiophene (PTP) has been developed for the turn on detection of CO2 with low background signal, taking advantage of the efficient fluorescence quenching of the tight aggregate of G-OF/PTP. In the presence of CO2, the electrostatic repulsion between G-OF and PTP can be effectively enhanced through protonation of the side chains, leading to the disaggregation and thus the “turn-on” fluorescence. The strategy allows for the light-up visible detection of CO2 with high sensitivity. Importantly, this system is capable of sensitively monitoring the concentration changes of CO2 in the process of the photosynthesis, which represents a concept to monitor the photosynthesis based on water-soluble conjugated polymers.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2015
·Vol. 32
·期 8
·1649-1654
·
IF 1.166
Tian Lufei,Zhou Minghao,Pan Xiaomei,Xiao Guomin,Liu Yunqing
Supercritical (Sc)-CO 2 extraction was adopted to extract ginkgolic (G.) acids from ginkgo biloba exopleura. Response surface optimization was employed to maximize extraction recovery of G. acids from ginkgo biloba exopleura. The effects of pressure, temperature, CO 2 mass flow rate, dosage of entrainer and extraction static-dynamic time on the yield of G. acids were investigated in detail, and the central composite design was used to maximize the extraction recovery of G. acids. The amounts of G. acids were analyzed by HPLC with the mixture of methanol and acetic acid solution as the mobile phase. The optimal process parameters for sc-CO 2 extraction were determined to be: 31.3MPa extraction pressure, 46.1 °C extraction temperature and 11.1 g min -1 CO 2 flow rate, 30mL ethanol entrainer, 1 h extraction static time and 2 h dynamic time. Under the conditions of optical extraction process, the average G. acids extraction rate was 74mg g -1 .
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CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Mengyang Xu,Bingqing Chang,Jinze Li,Huiqin Wang,Pengwei Huo
The assembly of different Metal organic framework (MOFs) into hybrid heterostructures has proven to be a promising strategy that can effectively break through the limited regulatory capacity of single metal sites. Here, an S-scheme heterostructure (Fe 3 Ni-MOF) based on homologous ligands (1,4-phthalic acid) of ultra-thin Ni-MOF and Fe-MOF nanoparticles with directional electron transport channels, was developed and used it for photoreduction of CO 2 . Under the S-scheme electric field mechanism, the photogenerated carrier can achieve efficient directional separation through Fe–O–Ni atomic bond, which significantly reduces the energy barrier of the rate-determining step. Results show that the performance of Fe 3 Ni-MOF (63.5 μmol g –1 ) was 20 and 3.2 times higher than that of Ni-MOF and Fe-MOF, respectively, and exhibits excellent CO selectivity (96.4%) and stability. Transmission electron microscopy and atomic force microscopy revealed the two-molecular-layers structure of Ni-MOF and the micro-assembly structure of Fe 3 Ni-MOF, which can shorten the electron transport distance and increase the molecular mass transfer rate. X-ray photoelectron spectroscopy, electron spin resonance and electron density difference calculations reveal that interfacial electric fields and atomic bonds work together to promote directional carrier separation, resulting in the accumulation of holes on Ni-MOF and electrons on Fe-MOF. The Gibbs free energy calculation and in-situ Fourier transformed infrared spectroscopy validate that the micro-assembled S-scheme heterostructures with directional electron transport channels can significantly reduce the activation energy barrier of the reaction. This study not only proves the feasibility of constructing MOFs S-scheme heterostructures using homologous ligands, but also provides a new way to overcome the limitations of monometallic MOFs. This strategy is expected to open up a new avenue to design efficient photocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yue Sun,Xiang Li,Bin Du,Jialong Cui,Ali Abdullah,Yanji Zhu,Huaiyuan Wang,Di Bao
Global warming is attributed to excessive emissions of greenhouse gases, which are being addressed through the deployment of carbon capture technologies aimed at mitigating climate change. However, this approach faces significant challenges, as high concentrations of CO 2 pose a huge risk of corrosion, compromising integrity. The active inhibitor polyfluoroaniline grown on the surface of graphene (Gr-PFAN) is encapsulated in epoxy novolac (EN) coating. And highly reactive nitrogen-containing poly(p-phenylenediamine-fluoroaniline) (Gr-PPFAN) was synthesized by changing the polymerization monomer. For the first time, primary amine nitrogen-containing active sites are discussed in CO 2 shielding material. The gas transmission rate (GTR) test showed that the GTR of the composite film containing Gr-PPFAN was 3.7 times higher than that of Gr-PFAN. And the presence of highly reactive amines in the polymer mass transfer behavior was calculated by molecular simulation. Therefore, the PPFAN coating is a serious failure in H 2 O-CO 2 environment. The introduction of the low content of active sites in Gr-PFAN into the epoxy resin matrix resulted in significant enhancement of the H 2 O, H 2 O-CO 2 and H + corrosion resistance. The small amount of active amine not only enhances the phase interface between the resin and the flake filler, but also facilitates the formation of a protective layer on the metal surface. Experimental results demonstrated that Gr-PFAN/EN exhibited the highest |Z| 0.01 Hz value (3.5 × 1011 O × cm 2 ) after 90 days of immersion in 3.5 wt% NaCl solution and 1.5 × 1011 O × cm 2 for 30 days in the carbon capture environment. Furthermore, it makes Gr-PFAN/EN a promising candidate for practical applications in CO 2 capture projects. The findings provide a scientific basis for the development of efficient anti-corrosion coatings suitable for carbon capture technologies.
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PubMed
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Processes
·
2024
·Vol. 12
·期 11
·2315
·
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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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiadong Li,Feng Wei,Ziyuan Xiu,Xiaojun Han
InVO 4 possesses great potential in photocatalytic CO 2 conversion. It is still highly desired to develop efficient strategies of photocatalyst fabrication to prevent its attenuated activity caused by the rapid recombination of photogenerated electron-hole. Herein, a direct Z-scheme heterojunction of Bi 2 WO 6 /InVO 4 nanosheets is constructed via two-step hydrothermal synthesis. The Bi 2 WO 6 /InVO 4 composite exhibits a superior photocatalytic performance toward CO 2 reduction into CO and CH 4 under visible light irradiation. The CO evolution rate reaches up to 17.97 μmol g −1 h −1 , while the CH 4 production rate is 1.13 μmol g −1 h −1 , which are higher than those catalyzed by bare InVO 4 and bare Bi 2 WO 6 . Based on the photoelectrochemical results, hydroxyl radical test, Scanning Kelvin Probe (SKP) and electron spin resonance (ESR) investigation, the enhanced activity of CO 2 reduction can be attributed to a Z-scheme electron transfer at the interface to promote spatial charge separation, which effectively preserves the reduction ability of photoelectron on the conduction band of InVO 4 for CO 2 conversion.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yueyangchao Yu,Yanting Tang,Longjie Liu,Qingnan Wang,Chongshan Yin,Keming Zhang,Chenlu Liu,Yi Ye,Xinglei Zhao,Tianhe Gu,Shaofei Wang
Covalent organic frameworks (COFs) show exceptional promise for CO2-selective mixed matrix membranes (MMMs) due to their tunable porosity and structural robustness. To mitigate COF aggregation in MMMs, we present an in situ growth strategy by directly integrating COF precursors into a polymer matrix. By optimizing reaction conditions, we achieve uniform dispersion and successful in situ formation of TpPa (derived from 1,3,5-triformylphloroglucinol and p-phenylenediamine) within the Pebax matrix. The optimized membrane exhibits a high CO2 permeability of 313.4 Barrer (45.8% higher than pure Pebax) and CO2/N2 selectivity of 22.6, along with long-term stability. Positron annihilation lifetime spectroscopy further reveals how the integration of COFs modulates the membrane’s free-volume properties. This study not only addresses filler dispersion challenges but also provides a viable approach for fabricating high-performance, stable CO2 separation membranes.
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