SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Jing Ding,Chenhui Qiu,Zhiqiang Zhang,Qinghua Qu,Cheng Fang,Jinfeng Zhang,Guofeng Guan,Hui Wan
Manipulating the oxidation states of transition metals is an ideal solution to achieve selective generation of different products and copper is widely used in CO 2 photocatalytic reduction to methanol. However, the understanding on the effects of valence states of copper species in SrTiO 3 on its structure and the selectivity of the corresponding product in CO 2 photocatalysis are currently still limited. Here, copper-doped SrTiO 3 nanofibers with different controllable ratios of Cu + /Cu 2+ and Cu + /Cu 0 were prepared by the combination of the electrospinning with the in-situ reduction method. The proportion of copper with different valence states (Cu + /Cu 2+ and Cu + /Cu 0 ) was changed by rationally adjusting the time of hydrogen reduction. The presence of monovalent copper facilitated the generation of reactive intermediates, thereby enhancing its photocatalytic activity. The copper-doped SrTiO 3 nanofibers obtained after 3 h of hydrogen reduction (STCu 0.08 -H-3 h) had the highest proportion of Cu + /Cu 2+ and Cu + /Cu 0 with the highest methanol yield (6.96 μmol·g −1 ·h −1 ). Methanol generation rate and Cu + /Cu 2+ ratio of STCu 0.08 -H-xh (x = 1, 2, 3, 4,5) with different hydrogen reduction time were proven to be linearly positively correlated. Furthermore, theoretical investigation and in-situ CO 2 infrared spectrum deeply understood the difference of CO 2 adsorption behavior and CO 2 activation over Cu 2+ and Cu + of STCu 0.08 -H-3 h photocatalyst and the reaction intermediates involved in the photocatalytic CO 2 reduction to methanol.
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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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DOI
PubMed
高影响因子
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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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Feilin Lin,Jianzhong Jiang
Emulsions have extensive applications in food, cosmetics, and agriculture, while the requirements for emulsions differ in various fields. It is a challenge for one emulsion to satisfy multiple requirements in different applications. Herein, CO 2 -switchable emulsions with controllable stability and viscosity were prepared by a mixture of chitosans (CS) and CTAB. After adding low concentrations of CTAB (e.g. 0.5 mM), the viscous Pickering emulsions stabilized by CS alone were converted into moderate-viscous Pickering emulsions due to the competition adsorption between CS aggregates and CTAB at the oil-water interface. The transformation of emulsion types (such as Pickering and conventional emulsions) and the emulsion's stability and viscosity were controlled by CO 2 /N 2 trigger. Furthermore, at high CTAB concentrations (≥ 0.8 mM), a novel long-term stable conventional emulsion was obtained after the CS aggregates at the oil-water interface were entirely replaced by CTAB. Compared with other stimuli, CO 2 is recognized as a green trigger that doesn't cause contaminations in the system, which has potential applications in organic synthesis and polymerization. Our strategy provides a simple and effective method to smartly control the properties of the emulsions (such as the emulsion type, stability, and viscosity), obtaining an intelligent emulsion to meet different requirements in many applications.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Li Fei,Zheng Wanjun,Jin Liequn,Cao Huazhen
Overusing fossil energy sources has led to global warming, seriously risking the habitability of the environments on which people depend. Photoelectrocatalytic (PEC) reduction of carbon dioxide (CO2) is a promising strategy to reduce CO2 into high-value-added chemicals and fuel products. However, photoelectrocatalysis faces problems related to low CO2 conversion efficiency and uncontrollable product complexity. This study reports a CuO–MoO3/TiO2NTs composite photoelectrode prepared by pulsed electrodeposition for the photoelectrocatalytic (PEC) reduction of CO2 to ethanol in a 1 M NaHCO3 medium under visible light irradiation and at an applied potential of −0.3 V vs. SCE. Molybdenum trioxide plays a regulatory role in the structure and properties of the photoelectrode. Photoluminescence analysis suggests that this occurs by introducing new energy levels between those of CuO and TiO2, which reduces the bandgap energy from 1.42 eV to 1.17 eV, promotes electron–hole pair separation, and significantly boosts photoelectrocatalytic activity. In addition, experimental results show that the doping of MoO3 enhanced the adsorption strength of the intermediate products and promoted the C–C coupling process. The optimized composite photoelectrode achieves 89% Faraday efficiency for ethanol at −0.5 V versus SCE (saturated calomel electrode). No new phases were generated during the catalytic process, confirming the stability of the CuO–MoO3/TiO2NTs composite photoelectrode.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zicheng Yang,Jiale Ni,Yuming Xie,Yi Feng,Jianfeng Yao
The design presented here involves zeolitic imidazolate framework (ZIF) nanotubes wrapped with a mesoporous polydopamine (mPDA) layer to merge the structural and textural merits of both materials for efficient CO 2 fixation at room temperature under solvent-free and light irradiation conditions. The resulting tubular Zn-ZIF@mPDA composite (ZZ@mPDA) demonstrates significantly improved catalytic activity in CO 2 cycloaddition with epichlorohydrin, achieving a selectivity of > 99 % and a high yield of 96.9 % at 18 h, which is superior to that of pristine Zn-ZIF, with a yield of only 51.4 %. In addition, the mPDA layer confers good structural and chemical stability to ZZ@mPDA, resulting in negligible catalytic activity loss after five cycles. A mechanistic study indicates that the superior catalytic performance of ZZ@mPDA can be attributed to the combined photothermal and photocatalytic effects, involving the participation of both Lewis acidic/basic sites and photo-induced electron/hole pairs in the activation of CO 2 and epoxides. This research demonstrates the potential of ZIF@mPDA for photo-driven CO 2 conversion to cyclic carbonates and offers insights into the underlying mechanism.
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高影响因子
Greenhouse Gases-Science and Technology
·
2025
·
IF 2.8
Ziyong Li,Qingdan Huang,Tingyan Wang,Huihong Huang,Haoyong Song
The amino groups and its substituents of organic amine absorbents have an important influence on the CO 2 absorption and desorption performance. In this study, four diamines with the same primary amino group and another different amino groups were selected as absorbents, including 1,3-propanediamine (1,3-PDA), 3-methylaminopropylamine (MAPA), 3-dimethylaminopropylamine (DMAPA), and 3-diethylaminopropylamine (DEAPA). The phase-change absorption system uses a mixture of polyether and H 2 O as the solvent. The CO 2 absorption performance of flue gas was studied with the analysis on absorption and desorption rate, cycle capacity, and desorption ratio. The effect of diamine molecular structures on phase-change CO 2 capture was investigated by nuclear magnetic carbon spectroscopy. The results show that DEAPA exhibits highest absorption capacity of 1.21 mol CO 2 /mol amine and recycling capacity of 1.09 mol CO 2 /mol amine. The absorption rate of primary and secondary diamines in the phase-change system is significantly higher than that of primary and tertiary diamines. The diamine system with tertiary amino groups has significantly faster desorption rate, higher desorption ratio, and cycle capacity than the primary and secondary diamine systems. The intramolecular tertiary amino group is more conducive to promoting the absorption of CO 2 than the intermolecular tertiary amino group, which can increase the absorption rate of CO 2 by the primary amino group and enhance the CO 2 desorption.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Xin Xie,Guilian Li,Shuo Geng
Bismuth oxide, a promising electrocatalyst for the formate production via electrocatalytic carbon dioxide reduction reaction (eCO 2 RR), suffers from structural instability at high overpotentials due to reduction-induced deactivation. This study proposes an innovative yttrium (Y) doping strategy that stabilizes Bi 2 O 3 through Y-Bi orbital interactions, effectively suppressing cathodic reduction during eCO 2 RR. Remarkably, the optimized 3 % Y-doped Bi 2 O 3 catalyst delivers outstanding performance, achieving a record formate Faraday efficiency (FE) of 97.9 % at −1.05 V vs. reversible hydrogen electrode (RHE) and maintaining FE > 90 % over a 350 mV potential window. Notably, it sustains FE exceeding 90 % even at industrial-grade current densities up to −160 mA cm −2 in flow cell configuration. Through systematic in situ spectroscopic characterization, density functional theory (DFT) calculations, and electrochemical analysis, we reveal that Y doping modulates the Bi−O electronegativity difference, which simultaneously stabilizes the Bi 3+ oxidation state and enhances adsorption of the critical *OCHO intermediate. This dual-function mechanism establishes a new paradigm for designing stable metal oxide electrocatalysts toward efficient formate electrosynthesis.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hui Zhou,Yifei Du,Junfeng Chen,Wen Yan,Yaowu Wei,Yan Xia,Shaowei Zhang,Nan Li,Yu Zhang,Lei Wang
Conventional electric melting or sintering processes of magnesia from magnesite are usually accompanied by massive energy consumption and CO 2 emissions. This work proposed a novel approach to utilize light-burned magnesium oxide from salt-lake brine to fabricate Y 2 O 3 -doped magnesia without pyrolytic CO 2 emission at a lower sintering temperature. Microstructural evolution, physical properties, pore structure, corrosion resistance and thermochemical stability of the sintered magnesia were evaluated. A favourable crystal boundary with MgO-Y 2 O 3 core-shell structure formed in the sample with 3-5 wt% Y 2 O 3 , and it led improved the thermal stability and vacuum volatilization of the fabricated MgO-Y 2 O 3 . Furthermore, a dense layer of MgAl 2 O 4 spinel on the slag/refractory interfaces of the sample with Y 2 O 3 -adding which contributed to the enhancement in corrosion resistance. An intercrystalline corrosion process and indirect dissolution process explained the degradation processes of the fabricated magnesia with or without Y 2 O 3 -adding, respectively. In summary, our novel design of Y 2 O 3 crystal-boundary enhanced magnesia with a low carbon footprint can achieve high value-added utilization of magnesium resource solid waste from salt-lake brine.
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ACS Applied Optical Materials
·
2025
·
IF 3.8
Yan Zhang,Junzhe Wang,Liang Li,Honggang Zhang,Bei Li,Xiangxiang Zhang,Zeyan Wang,Yuanyuan Liu,Peng Wang,Hefeng Cheng,Ying Dai,Baibiao Huang,Zhaoke Zheng
The design of organic–inorganic heterojunctions can facilitate the separation of photoinduced charge carriers by modulating the electronic structure at the surface and interface states, showing promising applications in the field of photocatalytic CO2 cycloaddition. However, the details of the surface/interface effects between these two components are still poorly understood. Herein, Cu2O@Cu3(HHTP)2 (HHTP = 2, 3, 6, 7, 10, 11-hexahydroxytriphenylene) heterojunctions were synthesized, where Cu2O nanoparticles (NPs) featuring distinct crystal facets were utilized as substrates for the in situ growth of the copper-based metal–organic framework (Cu3(HHTP)2). Among them, t-Cu2O@Cu3(HHTP)2, centered on t-Cu2O with {111} and {100} facets, exhibits superior performance toward photocatalytic CO2 cycloaddition to chlorinated propylene carbonate, with a conversion efficiency of 372 mmol g–1 h–1 under light. Notably, single-particle spectroscopy reveals a more efficient photogenerated carrier transfer between t-Cu2O and Cu3(HHTP)2. The results confirm that crystalline facet dependence is a key factor in semiconductor photocatalysis and an important strategy for optimizing the reactivity of photocatalysts, which provides a way to improve the photocatalytic CO2 cycloaddition performance by modulating the interfacial states of organic–inorganic heterojunction structures.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Houde She,Yanan Qiao,Bin Liu,Shiyou Li,Lei Wang,Jingwei Huang,Qizhao Wang
The rising levels of atmospheric CO 2 caused by industrial activities have led to escalating global climate challenges, calling for efficient and sustainable carbon mitigation strategies. However, conventional graphitic carbon nitride (g-C 3 N 4 )-based systems are hindered by low charge separation efficiency, limited visible-light absorption, and poor CH 4 selectivity, significantly restricting their catalytic performance. In this study, a novel photothermal catalyst‑ruthenium nanoparticle-loaded and boron-doped multilayered C 3 N 4 nanosheets (4Ru-3B-C 3 N 4 )-was synthesized via supramolecular self-assembly, NaBH 4 -assisted impregnation, and thermal calcination. The structure, composition, and optoelectronic characteristics were systematically characterized through XRD, FTIR, SEM/TEM, XPS, UV–vis DRS, PL, EIS, and in situ DRIFTS, while the reaction mechanism and electronic structure were confirmed using density functional theory (DFT) calculations and work function simulations. Compared to pristine C 3 N 4 , the multilayered nanosheet architecture, B-doping, and anchoring of Ru nanoparticles synergistically facilitate the provision of active sites and promote the separation of photogenerated charge carriers. Furthermore, combined with density functional theory (DFT) calculations, we demonstrate that the Ru nanoparticles serve as active centers, endowing the catalyst with enhanced CO 2 adsorption and activation capabilities, while lowering the overall reaction energy barrier for the conversion of CO 2 to CH 4 . Under photothermal CO 2 reduction conditions, 4Ru-3B-C 3 N 4 delivers a high CH 4 production rate of 266.6 μmol·g −1 ·h −1 , which is approximately 24 times that of pristine C 3 N 4 . The anchored Ru nanoparticles also contribute to the excellent cycling stability exhibited by the designed photocatalyst. This active surface engineering strategy provides a new perspective for developing high-performance catalysts for CO 2 photothermal reduction.
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高影响因子
Processes
·
2025
·Vol. 13
·期 11
·3570
·
IF 2.8
Yu Zhang,Ziyang Zuo,Mingyuan Wang,Weifeng Lyu,Ke Zhang,Jiahao Gao
As a process fluid in oil reservoirs, carbon dioxide plays a dominant role in enhanced oil recovery by increasing volume and decreasing interfacial tension. To study the volume expansion behavior of a CO2–oil system under reservoir conditions, ten hydrocarbon components with carbon numbers ranging from 8 to 26 were selected to represent crude oil. Systems of CO2with normal alkanes, cycloalkanes, and aromatic hydrocarbons were measured using a self-assembled high-pressure visible cell, with a temperature range of 313.15 K to 353.15 K and a pressure up to 25 MPa. Experimental results demonstrate that pressure and temperature significantly influence the relative volumetric expansion behavior. The expansion rate exhibits a positive correlation with pressure, whereas it shows a negative correlation with temperature. Among different molecular configurations, normal alkanes exhibit the most pronounced swelling effect. This study establishes that the volumetric expansion behavior of crude oil under CO2exposure is predominantly governed by n-alkane components with carbon numbers less than 16. In the heavy hydrocarbon (carbon number > 16) and CO2system, the influence of hydrocarbon structure and carbon number on the expansion extent is considerably reduced. This paper delivers critical theoretical foundations for elucidating the microscopic interaction mechanisms in CO2enhanced oil recovery and optimizing injection parameter strategies.
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