APPLIED ENERGY
·
2017
·
IF 7.182
Peng Wang,Yafei Guo,Chuanwen Zhao,Junjie Yan,Ping Lu
Large quantities of wood ashes derived from biomass materials combustion potentially threaten the ecological environment. Recycling of the wood ashes as solid sorbents for pollutants control is an economical and environmentally friendly route. In this work, waste wood ashes (WAs) were modified with tetraethylenepentamine (TEPA), monoethanolamine (MEA), diethanolamine (DEA), polyethyleneimine (PEI), and diethylenetriamine (DETA) to synthesize solid sorbents with enhanced CO 2 capture performances. CO 2 capture behaviors of the synthesized sorbents were tested under 60 °C, 5.0%CO 2 + 5%H 2 O using a fixed-bed reactor, and sorbent regeneration behaviors were evaluated under 120 °C, 10 °C/min and 100%N 2 . The sorbent synthesized of ashes collected from straw-fired power plants modified with TEPA (TEPA-WA-1) is identified as the optimum candidate with superior capability for CO 2 capture and sorbent regeneration. CO 2 capture capacity of TEPA-WA-1 increases first and then decreases with the increase of amine loading. Sufficient amine loading can provide substantive active sites for enhanced CO 2 chemisorption, whereas excessive loading will cause particle aggregation and pore structure blockage and affect its CO 2 capture capacity adversely. The maximum CO 2 capture capacity of 2.02 mmol CO 2 /g is obtained with an amine loading of 45 wt.%. The desired sorbent is demonstrated to be stable during 10 cyclic operations. Moreover, the presence of acid impurities (SO 2 and NO 2 ) exerts negative effect on the cyclic CO 2 capture and sorbent regeneration performances of the synthesized sorbent. It is mainly attributed to sorbent deactivation induced by the formation of byproducts and weakened physical properties for the sorbent exposed in acid impurities.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Yingchao Hu,Hongyuan Lu,Zhe Lv,Ming Zhang,Ge Yu
The traditional Li 4 SiO 4 -based CO 2 sorbent pellets prepared from mechanical granulation methods usually presented densified microstructures. Hence, wheat straw, an agricultural waste featured with huge production and low cost, was used as porosity creator to improve the microstructures and CO 2 capture performance of Li 4 SiO 4 pellets. The results indicated that wheat straw effectively enhanced the cyclic CO 2 sorption capacity of the pellets. In particular, 30 wt% wheat straw-templated Li 4 SiO 4 pellets (LA-WS30) exhibited the capacity of ~0.15 g/g that is almost twice as high as that of unmodified pellets. The enriched porosity and improved porous structures resulted from the quick release of burning gases was considered as the main reason for the performance enhancement. In addition, the alkaline (K and Na) salts in wheat straw played a positive role in CO 2 sorption of Li 4 SiO 4 pellets due to the reduced diffusion resistance. However, the pore plugging of residual wheat straw ashes after high-temperature treatment decreased the contact areas and, thus, led to the capacity reduction. To conclude, the comprehensive performance of wheat straw-templated Li 4 SiO 4 pellets is the result of the combined effects of porosity creation, alkali doping and pore plugging by ashes.
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JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Shuqing Song,Mingang Zhao,Zheyuan Guo,Yanxiong Ren,Jianyu Wang,Xu Liang,Yunchuan Pu,Shaoyu Wang,Hanze Ma,Xuerui Wang,Guangwei He,Zhongyi Jiang
Mixed matrix composite membranes (MMCMs) hold great potential to realize efficient CO 2 removal from natural gas. However, the reduction of separation performance arising from the interfacial defects, significant plasticization and aging effect in the thin films severely limit their application. Herein, we fabricated a series of polyimide MMCMs with MOF-protruding structure wherein amino-functionalized ZIF-8 nanocrystals nearly penetrate the thin selective layer. Through engineering the interfacial interactions, e.g., covalent or hydrogen bondings , we successfully fabricated defect-free MMCMs with the thickness ranging from 140 to 280 nm. The stronger interfacial interactions eliminate the interfacial defects and restrict the mobility of polymer chains under high pressure. Accordingly, the MMCM displays a high CO 2 permeance of 778 GPU and a CO 2 /CH 4 selectivity of 34 with significantly improved resistance to plasticization and aging. Considering the superior performance, we anticipate our work could provide guidelines on designing advanced MMMs to tackle critical separations.
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Greenhouse Gases-Science and Technology
·
2018
·Vol. 9
·期 1
·10-18
·
IF 1.991
Wei Liu,Ye Wu,Tianyi Cai,Xiaoping Chen,Dong Liu
Global climate change resulting from substantial CO 2 emissions is increasingly attracting attention, and coal-fired power plants are a major source of CO 2 emission, so it is necessary to control and reduce CO 2 emissions from power plants. Using alkali-based solutions for CO 2 capture is thought to be an effective method to achieve this but poor CO 2 sorption/desorption kinetics inhibit its development. The use of nanofluids, prepared by adding nanoparticles to an alkali-based solution, is a promising way to improve CO 2 sorption/desorption reactivity because the addition of nanoparticles not only improves the gas-liquid mass/heat transfer but also enhances the reaction kinetics. In this paper, a nanostructured Cu/TiO(OH) 2 was prepared and used to accelerate the CO 2 sorption/desorption performance of a potassium-based solution. The CO 2 sorption/desorption reaction rates increased with the thermal conductivity of the nanofluid but the inclusion of more nanoparticles resulted in particle sedimentation. The potassium-based solution containing 0.014 vol% of the nanostructured Cu/TiO(OH) 2 was therefore the targeted nanofluid that gave the best CO 2 sorption/desorption performance and cyclic stability. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.
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International Journal of Greenhouse Gas Control
·
2024
·
IF 4.6
Kang Shunji,Shen Zhi,Liu Baiqiang,Yi Qun,Ma Jun,Song Hao,Shen Xizhou
The petrochemical industry has a significant demand for high-purity hydrogen. It primarily obtained from the H 2 purification unit by using pressure swing adsorption (PSA) technology to recover H 2 from medium-temperature shifting gas (MTSG). The the coupled wet CO 2 separation-PSA process was introduced in this work, aiming to capture CO 2 from MTSG while simultaneously increasing the H 2 recovery rate. To enhance the desorption pressure of CO 2 separation unit in the coupled process to facilitate the storage or utilization of the captured CO 2 , firstly, a rigorous thermodynamic study was carried out to provide a theoretical basis for the development of an improved CO 2 solvent. Subsequently, a pilot-scale test was executed to validate the theoretical findings. Finally, the patented coupled process was implemented at an industrial scale for the first time. The results showed that the capacity of PSA unit for H 2 purification increased from 6800 to 12,000 tons per year and the H 2 recovery rate increased from 84.6 % to 93.6 %; the CO 2 desorption pressure increased from about 0.03 MPa (traditional Benfield process) to 0.15 MPa, which reduced the energy consumption of CO 2 compression, and the total average annual economic benefits increased by US $ 15.55 million.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Chaoyue Zhang,Mingrui Wang,Xinyue Han,Zheng Shen,Hongying Zhuo,Tianyu Zhang,Xiaofeng Yang,Yanqiang Huang
Metastable hcp-Ni enables the synthesis of highly dispersed and stable Ni/Al 2 O 3 catalyst • Highly dispersed Ni/Al 2 O 3 catalyst delivers 75.7% CO 2 conversion and 100-h stability • Original hcp-Ni particles spontaneously transform into fcc-Ni clusters of ∼2.3 nm • Small Ni clusters promote CO 2 methanation via monodentate formate intermediate • Fcc-Ni precursors undergo severe sintering to ultra-large and less-active particles Ni-based catalysts are promising candidates for CO 2 methanation while their practical applications are limited by particle agglomeration and deactivation. Here, we report a facile strategy to fabricate a highly dispersed and stable Ni/Al 2 O 3 catalyst using metastable hexagonal close-packed (hcp)-Ni as a precursor. Comprehensive characterization reveals that the initial hcp-Ni (∼12.0 nm) spontaneously transforms into uniform face-centered cubic (fcc)-Ni nanoparticles (NPs) of ∼2.3 nm on γ -Al 2 O 3 support during H 2 reduction and CO 2 methanation reaction. The small Ni particles contribute to improved Ni 0 proportion on catalyst surface. In contrast, the original fcc-Ni precursors are prone to sintering, forming ultra-large and less-active Ni aggregates. The highly dispersed Ni NPs derived from hcp-Ni enhance CO 2 adsorption-activation and facilitate the formate-mediated reaction pathway. The resulting hcp-Ni/Al 2 O 3 catalyst delivers a CO 2 conversion of 58.2% with a CH 4 selectivity of 85.4% at 460 °C and endows robust stability exceeding 100 hours. The optimal CH 4 space time yield reaches 179.5 mmol·g cat −1 ·h −1 , exceeding 2.4 times that of fcc-Ni/Al 2 O 3 . This work establishes a reliable synthesis paradigm rooted in crystal-phase regulation, enabling the manufacture of highly dispersed and stable Ni-based catalysts for efficient CO 2 methanation. Manufacturing Highly Dispersed and Stable Ni/Al 2 O 3 Catalysts from hcp-Ni for Enhanced CO 2 Methanation Download: Download high-res image (221KB) Download: Download full-size image
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AICHE JOURNAL
·
2026
·
IF 4.4
Aihemaiti Tuniyazi,Jing Li,Feng Li,Yi Zhang,Yating Yuan,Shuting Xi,Sheng Zhang,Shengping Wang
Electrocatalytic CO 2 reduction reaction (ECO 2 RR) faces limitations in conventional reactors due to high energy consumption, inefficient mass transport, and poor durability caused by ion-exchange membranes. Herein, we developed a membrane-free flow electrolyzer that dynamically decouples cathodic CO 2 -to-CO reduction from the anodic oxygen evolution reaction via a regenerative bromide cycle (Br − /BrO 3 − ). Operating at 216 mA cm −2 , the system achieves a record-low cell voltage of 1.85 V, maintains over 99% CO Faradaic efficiency, attains 32.9% single-pass CO 2 conversion, and reaches 71.9% energy efficiency (EE), with negligible degradation over 100 h of continuous operation. Operando spectroscopy reveals that local pH stabilization at 7.2 optimizes *CO/*H adsorption, thereby enhancing CO selectivity and EE. Techno-economic analysis shows a 60% lower power cost (111.8 vs. 277.79 $ ton −1 CO) vs. conventional systems. This work provides new insights into addressing persistent challenges in ECO 2 RR, including mass transfer limitations, carbonate formation, and anodic reaction mismatch.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Tao Zhu,Anqi Ming,Yuxiang Cao,Wencong Li,Xiaoxiao Li,Jun Sun,Lin Chen
CO 2 -responsive cationic polymers offer a route to couple industrial kiln exhaust pretreatment with sludge deep dewatering, using the abundant CO 2 in flue gas as a trigger to enhance flocculation. This study proposes a flocculation then activation strategy to enhance the flocculation effects of the CO 2 -responsive Poly-(DMC-DMAEMA) copolymer. The polymer is first dispersed in its low-viscosity, non-activated state to achieve uniform contact with suspended particles, followed by CO 2 bubbling to trigger in situ protonation of the PDMAEMA blocks. Using a diatomaceous suspension as model sludge, flocculation behaviors under different CO 2 addition modes were systematically compared. Pre-activation caused a sharp increase in solution viscosity and poor dispersibility, aggravating inhomogeneity. Post-activation-dispersion followed by CO 2 activation effectively balanced uniform adsorption with in situ bridging reinforcement, yielding superior floc growth, turbidity removal, and dewatering efficiency. This mechanistic strategy directly resolves the dispersion problem characteristic of conventional high-molecular-weight flocculants, thereby establishing a foundation for the integrated application of kiln exhaust pretreatment and sludge deep dewatering.
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Chemosensors
·
2026
·Vol. 14
·期 7
·168
·
IF 4.4
Jingjing He,Min Ye,Huiting Lian,Xuexia Lin
As a core component of vitamin B12, Co2+is closely associated with the health, life performance, and productivity of ruminants. Therefore, the selective and sensitive detection of Co2+is of great significance. In this work, using the Au–S bond as an “anchor”, a ternary nanocomposite (CDs-AuNPs-GSH) with synergistic functions was constructed by combining gold nanoparticles (AuNPs) with glutathione (GSH) through hydrogen bonding and electrostatic interactions with functional groups on the surface of carbon dots (CDs). The resulting nanocomposite was employed as a fluorescence sensor for Co2+detection. Under optimal conditions at pH 6.0, the sensor exhibited a good linear relationship over the Co2+concentration range of 0.5–125.0 mM, with a limit of detection (LOD) of 0.38 mM. The interaction mechanism between Co2+and the composite was systematically investigated using various characterization methods. The results indicated that Co2+, owing to its strong coordination ability, enriches on the surface of the composite, subsequently triggering dynamic fluorescence quenching via an electron transfer pathway. The sensor was successfully applied to determine Co2+in mixed livestock and poultry feed samples, with recovery rates ranging from 89.4% to 103.9%, demonstrating its potential for on-site detection in feed analysis.
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Chemistry-An Asian Journal
·
2026
·Vol. 21
·期 16
·e70944
·
IF 3.2
Mengsen Xian,Ruoyu Zhang,Guangzhen Shao,Chunwei Zhuo,Shunjie Liu,Xianhong Wang
CO 2 ‐based polycarbonates show great potential for application as biodegradable pressure‐sensitive adhesives (PSAs). However, it remains challenging for polycarbonate‐based PSAs to achieve rapid surface wetting while simultaneously maintaining sufficient cohesive strength. To address this issue and improve adhesive performance, we propose a strategy for preparing crosslinked polycarbonate PSAs. As a proof of concept, bio‐derived epoxides, including furfuryl glycidyl ether and n ‐butyl glycidyl ether, were introduced as key monomers to synthesize functionalized CO 2 ‐based polycarbonates (PBFCs). The crosslinked PSAs were subsequently constructed through a Diels–Alder reaction, while the flexible side chains enabled rapid wetting of the adhesive on the substrate surface. As a result, the static shear adhesion was significantly improved from approximately 0.1 h to over 24 h, accompanied by a tack grade of #2. Notably, the prepared PSAs could be reused for three cycles while maintaining a peel strength of approximately 2 N cm −1 , and no visible residue was observed on the substrate after peeling. This study develops a series of crosslinked CO 2 ‐based PSAs from bio‐based epoxides, providing a promising platform for the design of high‐performance biodegradable PSAs. CO 2 ‐based polycarbonates demonstrate significant potential in the application of biodegradable pressure‐sensitive adhesives (PSAs). However, achieving rapid surface wetting while maintaining sufficient cohesive strength remains a challenge for linear polycarbonates. To address these issues and enhance PSA performance, this study proposes a strategy for preparing crosslinked CO 2 ‐based polycarbonate PSAs. Polycarbonates (PBFC) were synthesized via the copolymerization of bio‐based glycidyl ethers (furfuryl glycidyl ether and n ‐butyl glycidyl ether) with carbon dioxide. Subsequently, the furan rings on the side chains of PBFCs reacted with bismaleimide hexane via Diels–Alder chemistry to form crosslinked PSAs, whereas the flexible side chains of PBFC facilitated rapid wetting of the substrate surface. Results demonstrated that the introduction of the crosslinked structure significantly enhanced the static shear adhesion force (increasing from approximately 0.1 h to over 24 h). Notably, the prepared PSAs could be reused three times while maintaining a peel strength of approximately 2 N/cm, with no residues observed on the substrate during peel tests. In this study, a series of crosslinked CO 2 ‐based PSAs were developed using bio‐based epoxides, providing a novel platform for the production of high‐performance biodegradable PSAs.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2026
·
IF 5.8
Meichao Gao,Yuting Ma,Yingfei Sun,Juntao Hao,Xiquan Zhang,Qiuju Zheng,Changlong Sun,Yunyun Gong
Heterojunction construction offers an effective means to modulate band structures and enhance charge separation in photocatalysis. The aim of this work is to develop a high-performance photocatalyst for CO2 reduction by combining the advantages of 1D and 2D materials. To achieve this, a hierarchical S-scheme heterojunction comprising 1D SiC nanowires and 2D BiOBr nanosheets is designed and fabricated via a facile hydrothermal route as the key method. The formation of the S-scheme heterojunction facilitates efficient spatial charge separation while preserving the strong reduction and oxidation potentials of the respective components. As a result, the SiC/BiOBr composite exhibits significantly enhanced visible-light absorption and markedly suppressed photogenerated carrier recombination compared to pristine BiOBr. Under simulated solar irradiation, the optimal catalyst achieves a CO evolution rate of 715.98 μL·g–1·h–1, approximately six times and five times higher than those of pure SiC and BiOBr, respectively. Furthermore, the heterojunction demonstrates excellent stability over extended photocatalytic CO2 reduction cycles. In conclusion, this work provides a promising strategy for constructing S-scheme binary heterostructures toward cooperative applications in environmental remediation and solar fuel conversion.
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Chemical Science
·
2026
·
IF 8.1
Lingyi Kong,Zhe Chen,Yuheng Chen,Lingxiao Wang,Yu Wang,Yafei Li
Electrolyte cations are widely recognized as critical promoters in electrochemical CO2 reduction reaction (CO2RR), yet the field has largely focused on cation identity while overlooking a more fundamental and practical parameter, namely cation concentration. Whether increasing cation concentration continuously enhances catalytic activity remains an open and consequential question, and the lack of mechanistic understanding has limited the rational design of electrolyte environments. Here, we demonstrate that cation concentration is not merely a secondary parameter, but a decisive kinetic regulator that fundamentally governs CO2RR performance. By integrating constant-potential ab initio molecular dynamics simulations with experiments, we reveal a previously unrecognized nonmonotonic (“volcano-type”) dependence of catalytic activity on K+ concentration over Ni-N-C single-atom catalysts. At moderate concentrations, K+ promotes CO₂ activation by restructuring the interfacial hydrogen-bond network and stabilizing key intermediates. Strikingly, further increasing K+ concentration leads to over-stabilization of *CO, impeding its desorption and suppressing overall reaction rates. This “double-edged” effect establishes an intrinsic trade-off between intermediate activation and product release. Experimental measurements directly validate this prediction, exhibiting a pronounced rise-and-fall trend in CO partial current density.
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高影响因子
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