Results in Engineering
·
2025
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IF 7.9
Ruiqi LI,Jie LING,Dongqiang LEI
The key to photocatalytic conversion of CO 2 is to improve the efficiency of solar energy utilization. Numerous studies have been devoted to modulating the forbidden bandwidth of photocatalytic materials, thereby altering the response of catalysts to light irradiation. In this paper, CO 2 conversion efficiency enhancement by photothermal catalytic means using precious metal-free LDHs@AC composites. The results show that photothermal catalytic conversion is 3.3 times more efficient than photocatalytic conversion in CO 2 conversion. The photocurrent transient response results show that the LDHs@AC material in the photothermal catalytic reaction, at higher experimental temperatures, the transfer of electrons from Ti 1 Li 3 Al 2 -LDHs to move the AC is faster, and the rate of the redox reaction is increased, which significantly improves the photocatalytic performance of the LDHs material.
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Nano Energy
·
2025
·
IF 17.1
Xingang Xu,Lu Yang,Zhilin Xia,Shuai Nie,Zhichao Liu,Fazhou Wang,Shuguang Hu,Yuanzheng Yue
The urgent challenges posed by global warming and CO 2 greenhouse effects have spurred extensive efforts in building material development for utilizing sequestered CO 2 and mitigating building energy consumption. Inspired by the natural cooling effect of ancient white marble architectures, here we developed an engineered marble material (EMM) for highly efficient radiative cooling. EMM was synthesized by carbonation of γ-Ca 2 SiO 4 through CO 2 . This process sequestered 511 kg CO 2 per ton of γ-Ca 2 SiO 4 . EMM possessed a hierarchical porous nano structure that offered a high solar reflectivity of 95 % and a strong thermal emissivity of 97 %. The EMM coating doped with alumina and silica gel exhibited a superior cooling effect, manifested by a maximum subambient temperature drop of 8.8 ℃. The radiative cooling effect resulted in a potential annual reduction in CO 2 emission up to 54.8 kg/m 2 . The radiative cooling effect of EMM was enhanced through chemical tuning that broadened the wavelength range of its thermal emission. EMM possesses coating-ability, castability, and multifunctionalities, presenting significant potential for large-scale implementation. This work opened a new way for the application of the CO 2 -utilized materials for radiative cooling in building engineering.
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Soft Matter
·
2017
·Vol. 13
·期 20
·3783-3788
·
IF 3.889
Dongfang Liu,Yuxin Suo,Jiang Tan,Hongsheng Lu
At present, more and more researchers around the world are paying attention to stimuli-responsive surfactants. In this paper, we have reported a microemulsion prepared from the tertiary amine TMPDA (N,N,N′,N′-tetramethyl-1,3-propanediamine) and the anionic surfactant SDS (sodium dodecyl sulphate), which has good carbon dioxide response characteristics. The molar ratio of TMPDA to SDS is 1 : 2. By introducing CO2 into the microemulsion that consists of SDS, TMPDA, n-hexane, n-butanol and water, the tertiary amine TMPDA molecules can be protonated to form quaternary ammonium species. The protonated tertiary amine TMPDA can be assembled with SDS by electrostatic interactions to form a pseudogemini surfactant (SDS–TMPDA–SDS). The pseudogemini surfactant can dissolve in the aqueous phase which makes the microemulsion break down eventually. By bubbling N2 after CO2 into the same system at 50 °C for 3 hours, the pseudogemini surfactant SDS–TMPDA–SDS disintegrates into SDS and TMPDA, respectively. At the same time, the microemulsion also recovers its initial state. Such a reversible transition could be repeated for several cycles from monophase to complete phase separation.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Xiao Cheng,Rong Chen,Xun Zhu,Qiang Liao,Xuefeng He,Shuzhe Li,Lin Li
Photocatalytic reduction of CO 2 is a promising technology to capture CO 2 and convert it into solar fuels simultaneously. However, current photoreactors usually face the problems of low specific surface area, non-uniform light distribution and poor photon transfer. To address these issues, a novel optofluidic membrane microreactor with high surface-area-to-volume ratio, enhanced photon and mass transport and uniform light distribution was proposed in this work by combining optofluidics with the membrane reactor technology for the photocatalytic reduction of CO 2 with liquid water. A TiO 2 /carbon paper composite membrane was prepared as the photocatalytic membrane via coating TiO 2 onto the carbon paper followed by hydrophobic treatment by poly-tetrafluoroethylene (PTFE) for the separation of the gas/liquid phases. The performance of the proposed optofluidic membrane microreactor was evaluated by measuring the methanol yield. The effects of the liquid water flow rate , light intensity and catalyst loading on the methanol yield were also studied. It was shown that a maximum methanol yield of 111.0 μmole/g-cat·h was achieved at a flow rate of 25 μL/min and under the light intensity of 8 mW/cm 2 , which is among the top in comparison to the reported data. Results obtained fully demonstrate the feasibility and superiority of the proposed optofluidic membrane microreactor for the photocatalytic reduction of CO 2 .
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Weicheng Xu,Bingxu Chen,Xueding Jiang,Feng Xu,Xin Chen,Limin Chen,Junliang Wu,Mingli Fu,Daiqi Ye
The effect of Ca modification on the Ni/ZSM-5 catalyst for efficient toluene oxidation was studied in a plasma-catalytic system. The Ni/ZSM-5 and Ca-Ni/ZSM-5 catalysts were prepared by a wet impregnation method and characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), Pyridine-FTIR spectroscopy and temperature programmed desorption of ammonia (NH 3 -TPD). Among the catalysts tested, the Ca-Ni/ZSM-5 sample showed the best potential for toluene conversion (90.2%) and CO 2 selectivity (70.7%). Pyridine-FTIR spectra and NH 3 -TPD results proved that the introduction of Ca and Ni onto ZSM-5 caused a decrease in the strong and weak acidic sites. In addition, gas chromatography/mass spectrometry (GC-MS) result showed that the Ca-Ni/ZSM-5 catalyst reduced the production of undesirable byproducts (such as p-nitrotoluene and methyl benzoate). Calcium in the Ni/ZSM-5 system influenced the acidity and other surface characteristic of the catalyst, as well as directly impacting the reactive plasma species and the intermediates. Finally, possible reaction mechanisms in the plasma catalysis of toluene were also proposed.
研究领域:
环境催化
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大气污染控制
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材料化学
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表面科学
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等离子体化学
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JOURNAL OF RARE EARTHS
·
2026
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IF 9.6
Zhichao Chen,Wenchao Wang,Hongzhi Wang,Licheng Liu
Electrocatalytic carbon dioxide reduction reaction (CO 2 RR) to produce value-added methane (CH 4 ) represents a promising approach to achieve carbon recycling and addressing global energy challenges. However, this reaction is currently hindered by limitations in catalytic selectivity and efficiency. Herein, we present a strategy involving strontium (Sr) doping at the A-site of La 2 CuO 4 perovskite (denoted as Sr x -LCO) to regulate surface basicity, thereby significantly enhancing catalytic performance for CO 2 RR toward CH 4 formation. The optimized Sr 0.04 -LCO catalyst achieves a Faradaic efficiency of 68.8% for CH 4 at −1.1 V (vs. RHE), which is significantly higher than that of undoped La 2 CuO 4 (44.1%) and at the top level among public reports. The results indicate that successful Sr doping to the La-site promotes electron transfer through the La−O−Cu linkage, generating a local alkaline microenvironment around the Sr−O sites. This microenvironment enhances CO 2 chemisorption and provides abundant reactive protons (*H). Theoretical calculations further confirm that the localized alkaline region reduces the activation energy barriers for the rate-determining steps (*CO 2 → *COOH and *CO → *COH) and suppresses the competing hydrogen evolution reaction (HER), thereby selectively steering the reaction pathway toward CH 4 formation. This study elucidates the mechanistic role of surface microenvironment modulation in enhancing CO 2 reduction reaction (CO 2 RR) selectivity for lanthanide perovskite, offering new insights for the rational design of high-performance electrocatalysts.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 6
·1830-1845
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IF 5
Hong Wang,Zhongming Wang,Mingquan Xiao,Zizhong Zhang,Xianzhi Fu,Wenxin Dai
Improving product selectivity is the most important goal for the artificial photosynthesis of CO2 and H2O considering that the adsorption behaviors of reactants may play an important role in the product selectivity of CO2 conversion. In this work, a black In2O3 sample was modified with fluoride anions (F−) as electron donors or amino ions (NH2+) as electron acceptors. F-modified In2O3 provided additional F− and In2+ sites, which promoted H2O to accept more electrons from the material, and exhibited a high selectivity to CH4 of 81.95%. NH2-modified In2O3 caused H2O to donate electrons to the material by constructing a hydrophobic layer, resulting in a high combined selectivity to methanol and carbon monoxide of 87.64%. Based on the two different H2O adsorption behaviors at In2+ sites adjacent to oxygen vacancy defects (VO–In2+) or at In3+ sites, the respective formation of hydrogen ions (H+) or protons (*H) is key to regulating the product selectivity of CO2 reduction. The formation of a confined-space structure of CO2 and its capacity to accept more electrons from the material induced by a higher number of VO–In2+ sites after modification both ensure the proceeding of CO2 reduction. The findings presented in this work add to the understanding of artificial photosynthesis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Peng Liu,Huiling Liu,Shun Zhang,Jie Wang,Cheng Wang
Electroreduction of carbon dioxide (CO 2 ) into formic acid/formate has been considered as one of the most promising strategies for obtaining value-added fuels and chemical productions. Herein, we present a general method for preparing Bi-based electrocatalysts via in situ reduction of bismuth oxyiodide (BiOI) in CO 2 -saturated electrolyte. The precursors of BiOI nanoplates (P-nanoplates) with thickness of 30–40 nm could be easily obtained and provide a concise model to probe the mechanisms of CO 2 reduction to formate. BiOI nanoplates precursors derived Bi nanosheets (P-nanoplates-Bi) exhibited an excellent performance for CO 2 reduction to formate, achieving Faradaic efficiencies (FEs) over 80% in a wide potential window and a maximum FE approaching of 95% with a current density of 13.3 ± 0.6 mA cm −2 at −0.9 V versus reverse hydrogen electrode (υs. RHE). Such P-nanoplates-Bi nanosheets showed a stable electrocatalytic actitivity during 15 h operation in 0.5 M KHCO 3 aqueous solution. The superior performance is mainly attributed to the two-dimensional (2D) Bi nanosheets, which can increase CO 2 •- adsorption, enlarge active surface area, show better reaction kinetics and provide lower contact resistance with accelerated electron transfer . For comparison, precursors of BiOI plate-like (P-bulk) with doubled thicknesses and ultrathin BiOI with a few nanometers derived Bi catalysts tend to agglomerate and appear as irregular structured Bi nanoparticles during the reaction. Their peak FEs for formate are much lower than those of P-nanoplates derived Bi nanosheets at −0.9 V.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ge Gao,Wufeng Jiang,Xiaoshan Li,Zhenghong Zhao,Cong Jiang,Cong Luo,Fan Wu,Liqi Zhang
Energy consumption is one of the crucial factors in determining the suitability of the chemical absorbents for capturing carbon dioxide (CO 2 ). Polyamines have attracted increasing attention in recent years because of the existence of several amino functional groups that could effectively capture CO 2 in their molecules. In this work, the structures of seven polyamines with excellent CO 2 capture performance were investigated in relation to reaction rate and the CO 2 absorption heat. A high-precision microcalorimeter was applied to analyze the absorption heat of CO 2 directly, and a parameter defined as the CO 2 quasi-cycle capacity was employed to assess the cyclic capture capacity of CO 2 , absorption rate, and desorption rate. Experimental results revealed that for the selected polyamines, the increase in the ratio of the secondary amino functional group to the primary-one in the molecule leads to a decrease in the CO 2 absorption heat and an increase in the CO 2 cyclic capacity.The ΔH abs of the eight amines give out the order of HMDA (92.22 kJ/mol) > MAPA(90.91 kJ/mol) > AEEA (87.62 kJ/mol) > MEA (86.36 kJ/mol) > TEPA (82.95 k/mol) > AEP (82.36 kJ/mol) > 2MPRZ (77.08 kJ/mol) > PZ (74.41 kJ/mol). The CO 2 quasi-cycle capacity of 2MPZR is about twice that of the MEA. In addition, 2MPRZ was found to be an absorbent with phase change potential. The effective phase change solvent system, 2MPRZ + Triethylene glycol monobutyl ether (TGBE) + H 2 O, was developed in this work. Compared to the 5 M MEA aqueous solution, its sensible heat was reduced by 56.3 %, indicating that 2MPRZ is a promising absorbent.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Chenhan Zhang,Jiahui Yan,Taotao Ji,Dongying Du,Yanwei Sun,Liangliang Liu,Xiongfu Zhang,Yi Liu
Preferred orientation represents a main concern for microstructure control and performance optimization of MOF membranes. To date, it remains a challenging task to precisely control preferred orientation of ZIF-8 membrane. Herein, we prepared highly (110)-oriented ZIF-8 membrane by oriented secondary growth. Among various elements, preparation of uniform ZIF-8 nanosheet seeds through thermal conversion of identically shaped ZIF-L precursors, spin-coating-assisted oriented deposition of (110)-oriented ZIF-8 seed layer, and controlled in-plane secondary growth at low temperature were found crucial for obtaining well-intergrown (110)-oriented ZIF-8 membrane whose H 2 /CO 2 ideal selectivity exceeded H 2 /N 2 and H 2 /CH 4 under ambient conditions, owing to preferential CO 2 adsorption capacity of not only PEI but also ZIF-8 nanosheets compared with their bulk counterparts. Our research highlighted the significance of preferred orientation regulation in tailoring the gas permeation behavior of MOF membranes.
研究领域:
材料科学
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化学工程
·
膜技术
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FLUID PHASE EQUILIBRIA
·
2026
·
IF 2.7
Yufan Ma,Cong Liu,Hongxing Wang,Jie Li,Qingli Qian
The solubilities of CO 2 , H 2 , and CH 4 in 1-ethyl-2-pyrrolidone (NEP) were measured using the isochoric saturation method at 413.15–453.15 K under pressures of 0.45–3.89 MPa (CO 2 ), 4.42–7.64 MPa (H 2 ), and 0.59–3.49 MPa (CH 4 ). The reliability of the apparatus was verified by measuring CO 2 solubility in N-methyl-2-pyrrolidone (NMP) at 323.15–353.15 K. The solubility order in NEP was found to be CO 2 > CH 4 > H 2 . Temperature-dependent Henry’s constants were obtained, and the experimental data were correlated using the Krichevsky–Kasarnovsky equation and the generic Redlich–Kwong (RK) cubic equation of state, with the RK model providing better accuracy. These results offer essential thermodynamic data for describing gas–liquid equilibrium in NEP and support solvent selection and process design in high-temperature CO 2 conversion systems.
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RSC Advances
·
2016
·Vol. 6
·期 38
·32400-32404
·
IF 3.289
Zhen-Feng Diao,Zhi-Hua Zhou,Chun-Xiang Guo,Bing Yu,Liang-Nian He
The synthesis of propylene carbonate (PC) from 1,2-propylene glycol (PG) and CO2 was smoothly performed in a PEG800 (polyethylene glycol)/CO2 biphasic system with K2CO3 as a catalyst and propylene oxide (PO) as a dehydrating agent. In the reaction of PG with CO2, PO presumably removes the water produced, and simultaneously generates more PG, both of which shift the thermodynamic control process and thus accelerate the PC synthesis. The PC yield directly from PG and CO2 reached 78% under relatively mild reaction conditions (4 MPa, 120 °C, 10 h). Notably, no additional by-product was detected in this process, resulting in economic benefits and the ease of workup procedure.
研究领域:
绿色化学
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二氧化碳利用
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催化化学
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有机合成
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可持续化学
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