ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ebrahim Ataeivarjovi,Zhigang Tang,Jian Chen
In this present work, a novel approach has been proposed by which a solvent absorption and membrane desorption methods can significantly reduce the carbon dioxide (CO2) emission and energy consumption. In this method, the CO2 capture processing is based on the combination of membrane and physical solvent. Here, dimethyl carbonate and polydimethylsiloxane (PDMS)–SiO2 nanocomposite were used as the physical solvent and desorption membrane, respectively. However, the main focus of this research was on the CO2 desorption behavior of PDMS–SiO2 hybrid membrane. To do so, the influence of the operating conditions and membrane properties on the pervaporation process to capture CO2 have been investigated. The PDMS–SiO2 hybrid membrane containing 10 wt % SiO2 was the most effective membrane. Results revealed that increase in CO2 concentration from 1.5 to 3 wt % led to decrease in the selectivity from 94 to 47 and increase in flux from 1.7 to 5.38 (kg/m2·h). In addition, an increase in temperature increased the flux and reached the highest level (8.17 kg/m2·h) at 40 °C. However, the selectivity decreased to 36.13. It was found that the addition of SiO2 nanoparticles to the PDMS membrane not only enhanced the membrane performance but also decreased the energy consumption about 75% compared with gas stripping method and mass transfer about 49% compared with pure PDMS membrane. Finally, these results illustrated that such a novel technique used for pervaporation separation process is a green and promising alternative to separate CO2 from the physical solvent.
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PubMed
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yongsheng Tan,Qi Li,Liang Xu,Chikezie Chimere Onyekwena,Tao Yu,Lifeng Xu
Nanoparticles effectively enhance the CO2 geological storage capacity by altering wettability during CO2–brine–rock interactions, which significantly impacts the CO2 residual trapping and migration in reservoirs. However, the effect of nanoparticles on CO2–brine–rock interactions in carbonate formations is poorly understood. Therefore, in this study, the impact of SiO2 nanoparticles (SNPs) on CO2–brine–rock interactions was evaluated under supercritical CO2 conditions (60 °C and 12 MPa) by analyzing wettability, conducting X-ray diffraction, scanning electron microscopy analyses, measuring weight loss, and performing low-field nuclear magnetic resonance (LFNMR) tests. The results indicated that (a) both CO2–brine–rock interactions and SNPs–CO2–brine–rock interactions can alter the wettability of carbonate rock surfaces from oil-wet to water-wet and that the carbonate rock became more water-wet after SNPs addition; (b) CO2–brine–rock interactions primarily involved the dissolution of calcite in carbonate rocks under acidic conditions, but SNPs–CO2–brine–rock interactions were more intense; (c) based on LFNMR analysis, the pores of the carbonate core in this study were divided into small pores (T2 < 5 ms) and large pores (T2 > 5 ms), with CO2–brine–rock interactions occurring mainly in the large pores of the carbonate cores but with enhanced interactions in small pores; (d) CO2 solubility in solution after CO2–brine–rock interactions increased with increasing pressure and eventually reached equilibrium, and this trend was observed both in the CO2–brine–rock system and the SNPs–CO2–brine–rock system. However, the CO2 solubility in the SNPs–CO2–brine–rock system was greater than that in the CO2–brine–rock system.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Ziyi Li,Jia Xiong,Hang Song,Shuchang Liu,Yufei Huang,Yangqiang Huang,Geoffrey I. N. Waterhouse,Ziyun Wang,Yu Mao,Zhiwu Liang,Xiao Luo
To enhance the photocatalytic efficiency of ZIF-67 (Zeolitic Imidazolate Framework-67), we integrated it with Ti 3 C 2 T x MXene through in-situ synthesis and assessed the effects of different MXene concentrations on photocatalytic activity. We identified ZIF-67/Ti 3 C 2 T x MXene as the optimal catalyst (denoted as ZT-450), yielding CO, CH 4 , and H 2 at 62.7, 6.7, and 7.3 μmol g −1 , respectively. The CO productive rate achieved by ZT-450 exhibits a substantial enhancement, outperforming both ZIF-67 and Ti 3 C 2 T x by factors of 16.1 and 4.8, respectively. After introducing Ti 3 C 2 T x in ZIF-67, CO 2 adsorption ability achieves 127.90 μmol g −1 , much higher than those of pure ZIF-67 and Ti 3 C 2 T x . Combining Density Functional Theory (DFT) calculations, we established that introducing Ti 3 C 2 T x in ZIF-67 facilitates rapid electron transfer and improves light absorption, CO 2 activation. In-situ DRIFTS measurements of photocatalytic CO 2 reduction reaction (CO 2 RR) on ZIF-67/Ti 3 C 2 T x MXene composite were employed to reveal the emergence of intermediates such as *COOH, *CHO, *OCH 3 , etc ., and elucidate the mechanism accordingly. This research contributes to the advancement of photocatalytic CO 2 RR, offering insights into applying Ti 3 C 2 Tx MXene in photocatalysis.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xi Tang,Bin Xu,Wufeng Jiang,Xiaoshan Li,Ge Gao,Fan Wu,Cong Luo,Liqi Zhang
Piperazine (PZ) derivatives which have been widely used in CO 2 capture technology exhibit stable physicochemical properties, such as resistance to thermal degradation and low regeneration energy consumption. Both two parameters of CO 2 absorbents, low CO 2 absorption heat (ΔH abs ) and large CO 2 equilibrium solubility (α e ), are important to CO 2 capture performance. However, the influence of functional group types of PZ derivatives on their CO 2 capture performance remained unclear. This research aimed to study the functional group influence on the ΔH abs and α e by PZ derivatives with two amines using experimental and quantum chemical methods. The results indicated that PZ derivatives with the ethyl side chain had larger ΔH abs and α e than those with the methyl side chain. The presence of the hydroxy group in PZ derivatives reduced the ΔH abs and the α e . The presence of cyclic methyl side chains on the N atom of PZ derivatives decreased the ΔH abs and increased α e at the same time. The findings show that PZ derivatives with cyclic methyl side chains, steric hindrance effect, and no hydroxy group are favorable for CO 2 capture. Among the eight PZ derivatives, TEDA with lower ΔH abs (48.99 kJ/mol) and higher α e (0.917 mol CO 2 /mol amine) is an excellent absorbent. The results of this study are very important for screening efficient and low-energy consumption absorbents for CO 2 capture.
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Fundamental Research
·
2024
·
IF 5.7
Na Chu,Xiaobing Wu,Ziyue Zhao,Xue Zheng,Yilin Lu,Ying Pu,Yue Wang,Jiayi Cai,Lixia Zhang,Xiaohong He,Daping Li,Raymond Jianxiong Zeng,Yangyang Yu,Yong Jiang
The demand for converting CO 2 into fuels or chemicals is on the rise to achieve a carbon-efficient circular economy. Biohybrid CO 2 electrolysis shows potential for increasing production rates and diversifying product spectra by combining electrocatalysts and microbial catalysts. However, it is important to note that utilizing a shared catholyte for biohybrid CO 2 electrolysis has not demonstrated significant performance improvements to date. In this study, we developed a biohybrid CO 2 electrolysis system utilizing a solid electrolyte operating in an external mode. The produced formic acid was extracted and used as an intermediate for microbial conversion. Impressively, the solid-electrolyte CO 2 electrolysers obtained a remarkable total Faraday efficiency of 81.4% for formic acid production. In-situ mechanism studies unveiled metallic tin as the probable real active site, prompting further exploration of strategies to boost the activity and stability of electrocatalysts. In the bioconversion step, we achieved a noteworthy 8-day duration for generating bioelectricity, nearly 100% electron recovery for biomethane production, and 90.8% for acetate generation. Additionally, when ethanol was co-fed, a C 6 specificity of 41.1% was observed for the generation of medium-chain fatty acids (MCFAs). This study presents groundbreaking experimental data that demonstrates the numerous advantages of utilizing hybrid systems as advanced synthesis techniques.
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RESOURCES CONSERVATION AND RECYCLING
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2024
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IF 11.2
Yuguang Mao,Xiang Hu,Sarra Drissi,Wei Chen,Caijun Shi
To address the challenge posed by the carbonation product layer formed on recycled cement paste powder (RCPP) on the efficiency and degree of carbonation, CO 2 -loaded monoethanolamine (MEA) “microcapsules” were used. The CO 2 within MEA was released by heating after the formation of the dense carbonation products layer on RCPP to provide an additional internal CO 2 source to penetrate into the uncarbonated layer. Results showed that using CO 2 dissolved in 15 %, 30 %, and 45 % MEA aqueous solution increased the carbonation degree of RCPP by 10.8 %, 11.2 %, and 13.8 %, respectively, compared to RCPP wet carbonated in water. In addition to calcite, vaterite and aragonite were observed in the CO 2 -loaded MEA carbonated RCPP. The long-term compressive strength of cement pastes with 30 % CO 2 -loaded MEA carbonated RCPP increased, and the porosity decreased compared to cement paste with RCPP wet carbonated in water. However, MEA negatively affected the early compressive strength of the cement paste.
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高影响因子
ENERGY & FUELS
·
2025
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IF 5.3
Junjie Ren,Siyu Zeng,Yunting Liu,Chenlu Xu,Hongfeng Lu,Jianzhong Zhao,Praveen Linga,Zhenyuan Yin
Hydrate-based CO2 sequestration in marine sediments has emerged as a promising strategy to mitigate global climate change due to its substantial storage capacity and operational feasibility. However, understanding the influence of chloride salts from seawater, such as KCl, NaCl, CaCl2, and MgCl2, on CO2 hydrates phase stability is essential for the practical application of subsea CO2 sequestration as hydrates. This study systematically investigates the phase equilibria of CO2 hydrates in KCl, NaCl, CaCl2, and MgCl2 solutions at concentrations of 0–400 mM, encompassing typical marine salinity conditions. The experimental results demonstrate that all four chloride salts exhibit thermodynamic inhibition effects on CO2 hydrates, with the inhibitory effect intensifying as concentration increases. MgCl2 exerts the strongest thermodynamic inhibition effect, suppressing CO2 hydrates equilibrium temperature by 0.96 K at 200 mM and 1.57 K at 400 mM concentrations under 3.0 MPa. The inhibition strength follows the order of MgCl2 > CaCl2 > NaCl > KCl, which correlates well with the ion charge and radius of cations. A thermodynamic model was developed by integrating the Hu-Lee-Sum correlation of water activity with the classical Chen-Guo model for the prediction of the thermodynamic phase equilibria for CO2 hydrates. The proposed model demonstrates high accuracy, with an average absolute deviation of pressure below 2.0% across all tested concentrations. Validation against experimental data and literature values confirms the reliability of the model and serves as a prediction tool for CO2 hydrates phase equilibria with chloride salts. This study advances the understanding of CO2 hydrates thermodynamics in saline systems, elucidating the inhibitory effects of chloride salts and the associated impact on CO2 hydrates stability. The findings provide the thermodynamic foundation for the near-future large-scale adoption of hydrate-based CO2 sequestration.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Guochen Hu,Wen Luo,Jijun Wu,Wenhui Ma
Recovering Li from spent battery cathodes is crucial for mitigating scarcity and promoting sustainability. Conventional pyro-hydrometallurgical methods face challenges in Li selectivity due to volatilization losses and inadequate phase control. This study proposes a green approach for sustainable battery recycling. It combines CO 2 -mediated carbothermal reduction with CO 2 -saturated leaching to selectively recover Li from spent lithium-ion batteries. By utilizing graphite-mediated carbothermal reduction under precisely controlled CO 2 atmospheres at 800 °C, Li 2 O are converted into stable Li 2 CO 3 , effectively suppressing Li volatilization. Coupled with CO 2 -saturated leaching at 30 °C, the process achieves 99.8 % Li recovery and 99.9 % Li 2 CO 3 purity. A CO 2 -controlled “Li 2 O-Li 2 CO 3 ″ dual-phase dynamic equilibrium model was established, effectively restricting the migration path of Li. This study enhances understanding of gas–solid equilibrium in carbothermal processes and advances sustainable, efficient battery recycling.
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高影响因子
Polymers
·
2024
·Vol. 16
·期 15
·2191
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IF 4.7
Mingxi Liu,Kaoping Song,Longxin Wang,Hong Fu,Jiayi Zhu
Since reservoirs with permeability less than 10 mD are characterized by high injection difficulty, high-pressure drop loss, and low pore throat mobilization during the water drive process, CO2is often used for development in actual production to reduce the injection difficulty and carbon emission simultaneously. However, microfractures are usually developed in low-permeability reservoirs, which further reduces the injection difficulty of the driving medium. At the same time, this makes the injected gas flow very fast, while the gas utilization rate is low, resulting in a low degree of recovery. This paper conducted a series of studies on the displacement effect of CO2-soluble foaming systems in low-permeability fractured reservoirs (the permeability of the core matrix is about 0.25 mD). For the two CO2-soluble blowing agents CG-1 and CG-2, the effects of the CO2phase state, water content, and oil content on static foaming performance were first investigated; then, a more effective blowing agent was preferred for the replacement experiments according to the foaming results; and finally, the effects of the blowing agents on sealing and improving the recovery degree of a fully open fractured core were investigated at different injection rates and concentrations, and the injection parameters were optimized. The results show that CG-1 still has good foaming performance under low water volume and various oil contents and can be used in subsequent fractured core replacement experiments. After selecting the injection rate and concentration, the blowing agent can be used in subsequent fractured cores under injection conditions of 0.6 mL/min and 2.80%. In injection conditions, the foaming agent can achieve an 83.7% blocking rate and improve the extraction degree by 12.02%. The research content of this paper can provide data support for the application effect of a CO2-soluble blowing agent in a fractured core.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Xi Chen,Zhenggang Wang,Zhuo Yang,Guozhen Liu,Guining Chen,Gongping Liu,Xiuxia Meng,Naitao Yang,Wanqin Jin
Towards natural gas purification , polymeric membranes generally face challenges of trade-off between permeability and selectivity , as well as CO 2 -induced plasticization effect. Previous works demonstrated that incorporating high-performing nanofillers and crosslinking the polymers are effective methods to overcome these two issues, respectively. In this work, we aimed to simultaneously improve permeability, selectivity and plasticization resistance of polymeric membranes by incorporating surface-engineered nanoporous fillers for CO 2 /CH 4 separation. DD3R zeolite nanoparticles with high purity were synthesized and then surface-functionalized by 3-aminopropyl trimethoxysilane (APTMS) to serve as the filler. Mixed-gas permeation measurements showed that DD3R zeolites offered CO 2 -selective channels in 6FDA-DAM polyimide based on molecular sieving effect of zeolitic aperture. 30 wt% DD3R-APTMS zeolite imparted the membrane with CO 2 permeability of 1661 Barrer (increased by 71.7%) and CO 2 /CH 4 selectivity of 28.0 (increased by 44.5%), which was beyond the upper-bound of polymeric membranes. Meanwhile, the hydrogen bond interaction between amino groups on APTMS and carboxyl groups on 6FDA-DAM rendered the resulting DD3R-APTMS MMMs highly enhanced plasticization resistance over 40 bar when equimolar CO 2 /CH 4 mixture as the feed. This work demonstrates a facile approach to simultaneously enhance separation performance and mitigate the plasticization effect.
研究领域:
材料科学
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化学工程
·
膜技术
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
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IF 6.578
Leixin Yang,Shengbo Zhang,Hong Wu,Chumei Ye,Xu Liang,Shaofei Wang,Xingyu Wu,Yingzhen Wu,Yanxiong Ren,Yutao Liu,Nayab Nasir,Zhongyi Jiang
For high-performance mixed-matrix membranes (MMMs), it is crucial to design gas transport channels in fillers to rationally manipulate the structure-property relationship. In this study, the novel porous organosilicon nanotubes (PSiNTs) were incorporated into Pebax to prepare MMMs for biogas purification (CO 2 /CH 4 separation). After comparing the separation performance of MMMs containing PSiNTs and MMMs containing non-porous organosilicon nanotubes (SiNTs)，it can be found that the porous structure on wall of organosilicon nanotubes had a significant effect on the improvement of the gas permeability . In addition, the amino-modified PSiNTs (N-PSiNTs) were prepared and introduced into membranes to significantly enhance the CO 2 permeability and CO 2 /CH 4 selectivity. Firstly, the porosity of N-PSiNTs afforded rapid gas transport channels in MMMs and intensified the diffusion mechanism, increasing the CO 2 permeability. Secondly, the reversible reaction between amino groups and CO 2 in MMMs intensified the facilitated transport mechanism, increasing the CO 2 /CH 4 selectivity. In particular, the Pebax-N-PSiNTs with 0.5 wt% and 1 wt% N-PSiNTs exhibited the optimal separation performance, which surpassed 2008 upper bound and were superior to the MMMs incorporated with other kinds of nanotubes.
研究领域:
材料科学
·
环境工程
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Cheng,Shumaila Razzaque,Zhen Zhan,Bien Tan
Fabrication of functionalized hypercrosslinked polymers (HCPs) with high specific surface area has gained significant research interest and their utilization for gas storage is still a trending research area. Considering the significance of solvent knitting strategy in construction of remarkably high surface area HCPs, we report fabrication of cyano-functional HCPs via one step Friedel-Crafts reaction. The series of HCPs were obtained by copolymerizing the rigid monomer TPB with a 2-napthonitrile in different molar ratio. The resultant co-polymerized polymers contained a plenty of nitrile functional groups and possessed high BET surface area. Among the series of such HCPs, HCP-TPB-CN-3:1 showed the highest BET surface area up to 2017 m 2 g −1 . These HCPs have enriched nitrogen in their pore walls that enhance the facile interaction of CO 2 to achieve higher capture capacity of 21.3 wt% at 273 K. Moreover, the HCP-TPB-CN was explored for CH 4 storage and showed absolute adsorption capacity of 0.35 g/g at 273 K, 80 bar, which is comparable with the porous polymers reported so far. These results highlight the significance of solvent knitting strategy and broaden the scope of HCPs for versatile industrial applications.
研究领域:
材料科学
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化学工程
·
环境科学
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