Plasma Processes and Polymers
·
2024
·Vol. 21
·期 7
·2400001
·
IF 2.9
Shouxian Tang,Shiji Qin,Zhengduo Wang,Lijun Sang,Jiushan Cheng,Zhongwei Liu
A solution combustion synthesis (SCS) process to prepare nickel catalyst over bentonite (NiO/Ben) is reported. Compared to the traditional impregnation method, NiO/ben produced by SCS has smaller nickel particle size and higher dispersion. With a metal loading of 20 wt%, the afforded NiO/Ben demonstrates excellent catalytic activity for CO 2 methanation in a dielectric barrier discharge reactor. In certain discharge conditions (H 2 :CO 2 ratio of 5 in feed gas, discharge input power of 45 W, and gas hourly space velocity of 11 320 h − 1 ), CO 2 conversion and CH 4 selectivity are as high as 55.8% and 84.6%, respectively. Under the conditions of plasma configuration, the strong interaction between the nickel species and the support plays an important role in the CO 2 methanation process.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Zhijie Zhang,Liang Li,Ying Jiang,Jiayue Xu
Heterojunction manipulation has been deemed as a promising approach in exploring efficient photocatalysts for CO2 reduction. In this article, a novel step-scheme (S-scheme) photocatalyst of CsPbBr3 quantum dots/BiOBr nanosheets (CPB/BiOBr) was fabricated via a facile self-assembly process. The strong interaction, staggered energy band alignments, and much different Fermi levels between CsPbBr3 and BiOBr promised the formation of an S-scheme heterojunction. The resultant CPB/BiOBr heterojunction delivered remarkable photocatalytic performance in CO2 reduction, with an electron consumption rate of 72.3 μmol g–1 h–1, which was 4.1 and 5.7 times that of single CsPbBr3 and BiOBr, respectively. The superior photocatalytic performance originated from the impactful spatial separation of photoinduced electron–hole pairs, as well as the preservation of strongly reductive electrons for CO2 reduction. This work offers a rational strategy to design S-scheme heterojunctions based on lead halide perovskites, which are expected to have potential applications in the field of photocatalysis and solar energy utilization.
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IEEE SENSORS JOURNAL
·
2026
·
IF 4.5
Dingyi Feng,Jing Tian,Changjiang Zhang,Wen Ao,Ying Ma,Fu Liu,Jianlin Zhao,Biqiang Jiang
Reliable and cost-effective detection of percent-level carbon dioxide (CO2) is important for industrial process control, confined-space safety, agricultural storage, and leakage warning, where elevated CO2 levels may pose risks to operational safety and human health. Here, we demonstrate a tilted fiber Bragg grating (TFBG) CO2 sensor integrated with electrospun titanium dioxide/polyimide (TiO2/PI) composite nanofibers. The porous reticular nanofibrous film provides abundant CO2 adsorption sites and continuous gas diffusion channels, while enabling efficient coupling between gases induced material variations and the evanescent field of TFBG cladding modes. CO2 adsorption alters the dielectric properties and effective refractive index of the TiO2/PI coating, thereby perturbing the cladding-mode field and modulating the resonance intensity in the transmission spectrum. After optimization of the TiO2 nanoparticle concentration and electrospun time, the sensor exhibited an intensity sensitivity of 0.050 dB/% within a CO2 concentration range of 0–20%. The enhanced performance arises from the synergy between the CO2 affinity of PI, the active TiO2 sites, the porous nanofibrous coating, and the surface field sensitivity of the TFBG. Benefiting from its simple fabrication process, low material cost, good repeatability, and stable optical response, the proposed TiO2/PI nanofibers integrated TFBG provides a promising optical platform for real-time CO2 monitoring, especially in distributed and low-cost sensing applications.
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Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 11
·1-11
·
IF 4.3
Gao Huimin,Zhang Jinpeng,Zhang Fangyuan,Jing Jieying,Li Wen-Ying
The photocatalytic reduction of CO 2 into formic acid is a feasible approach to alleviate the effects of global climate change and achieve chemical energy storage. It is important to design highly active photocatalysts to improve the selectivity and yield of formic acid. In this study, TiO 2 -based catalysts were prepared and loaded with Pd nanoparticles via an impregnation process. The Pd/H-TiO 2 catalyst demonstrated superior CO 2 reduction activity and a high formic acid production rate of 14.14 mmol cat ·g −1 ·h −1 . The excellent catalytic performance observed in the presence of a Pd/H-TiO 2 catalyst is ascribed to the synergy between O v and Pd. The presence of O v led to increase in CO 2 adsorption while Pd loading enhanced the photogenerated electron-hole pair separation. Electron transfer from H-TiO 2 to Pd also contributed to CO 2 activation.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Danni Tang,Bing Ma,Ruiqiang Liu,Jingqing Tian,Chen Zhao
2,5-Furandicarboxylic acid is an important biomonomer for the synthesis of polyesters, and studies on the synthesis of FDCA mainly focus on the 5-hydroxymethylfurfural and furoic acid routes. The synthetic route starting from furfural has a broader and more economical raw material source than the furoic acid route. In this study, the furfural route was used to develop an energy-efficient and one-pot method for synthesizing FDCA from furfural and CO2 as raw materials. Under solvent-free conditions, the Co–N–C catalyst and CsOH·H2O were used as catalyst and base, respectively. Pure furfural was converted to cesium furoate (with a yield of 93%) by mechanical ball-milling. Then, without the need for separation and purification, CsOH·H2O was in situ-transformed into Cs2CO3 at 260 °C under a flowing CO2 atmosphere, thereby facilitating the carboxylation of furoate to cesium 2,5-furandicarboxylate. The dynamic experiments and Matlab data fitting revealed that it followed the iterative steps of rapid disproportionation (k1 = 7.53) and slow furfuryl alcohol oxidation (k2 = 0.13). Single Co sites improved atomic utilization without using any solvent, yielding a fast formation rate of furoic acid (21.6 molFA molmetal–1 h–1). The renewable biomass furfural and greenhouse gas CO2 were comprehensively utilized to form a biobased polyester monomer FDCA via a green and simple strategy.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Kuirong Deng,Shuanjin Wang,Shan Ren,Dongmei Han,Min Xiao,Yuezhong Meng
This work demonstrates the facile and efficient synthesis of a novel environmentally friendly CO2-based multifunctional polycarbonate single-ion-conducting polymer electrolyte with good electrochemistry performance. The terpolymerizations of CO2, propylene epoxide (PO), and allyl glycidyl ether (AGE) catalyzed by zinc glutarate (ZnGA) were performed to generate poly(propylene carbonate allyl glycidyl ether) (PPCAGE) with various alkene groups contents which can undergo clickable reaction. The obtained terpolymers exhibit an alternating polycarbonate structure confirmed by 1H NMR spectra and an amorphous microstructure with glass transition temperatures (Tg) lower than 11.0 °C evidenced by differential scanning calorimetry analysis. The terpolymers were further functionalized with 3-mercaptopropionic acid via efficient thiol–ene click reaction, followed by reacting with lithium hydroxide, to afford single-ion-conducting polymer electrolytes with different lithium contents. The all-solid-state polymer electrolyte with the 41.0 mol % lithium containing moiety shows a high ionic conductivity of 1.61 × 10–4 S/cm at 80 °C and a high lithium ion transference number of 0.86. It also exhibits electrochemical stability up to 4.3 V vs Li+/Li. This work provides an interesting design way to synthesize an all-solid-state electrolyte used for different lithium batteries.
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JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Shichun Li,Zhi Wang,Chenxin Zhang,Mingming Wang,Fang Yuan,Jixiao Wang,Shichang Wang
Polymeric membrane materials containing ethylene oxide (EO) groups show promising applications in CO 2 separation processes for clean energy supply and environmental remediation, but the fabrication of defect-free thin membrane possessing high CO 2 permeance and CO 2 /gas selectivity is still a challenge. In this work, the thin film composite (TFC) membranes containing EO groups were developed by interfacial polymerization (IP) with trimesoyl chloride and commercial diamines named diethylene glycol bis(3-aminopropyl) ether (DGBAmE) and diaminopolyethylene glycol (DAmPEG). The TFC membranes prepared with DGBAmE and DAmPEG were named EO-3 and EO-21 according to the length of EO units, respectively. The structure and separation performance of membranes with short EO units and long EO units were compared, and the concentrations of monomers used in IP were adjusted to optimize the structure and separation performance of membranes. The results show that the structure and separation performance of EO-21 are hardly optimized by simply increasing the concentration of DAmPEG, because in IP process, the long EO units of DAmPEG not only decrease the diffusion rate of DAmPEG from aqueous phase to organic phase, but also hinder the diffusion of DAmPEG through the nascent film for further reaction, which results in the extremely low crosslinked density of EO-21 and the deterioration of gas selectivity at high feed pressure. In contrast, the structure and separation performance of EO-3 are conveniently adjusted by changing concentrations of monomers due to the much shorter EO units of DGBAmE which are beneficial for the diffusion and reaction of DGBAmE in IP process. EO-3 prepared with optimized monomer concentrations displays attractive CO 2 permeance and CO 2 /gas selectivity, which shows promising applications in syngas and natural gas purification and flue gas CO 2 capture.
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Journal of CO2 Utilization
·
2024
·
IF 7.2
Yansong Ren,Tianyun Zhang,Shuanjin Wang,Dongmei Han,Sheng Huang,Hui Guo,Min Xiao,Yuezhong Meng
Although triblock polycarbonate thermoplastic elastomers (TPEs) have recently attracted great interests due to their biodegradability, insufficient attentions have been paid to improving the elastomeric properties. Through a tandem reaction strategy involving CO 2 / allyl glycidyl ether (AGE) / cyclohexene oxide (CHO), poly(cyclohexene carbonate)-b-poly(allyl glycidyl ether carbonate)-b-poly(cyclohexene carbonate) (PCAC) is successfully synthesized using a metal-free Lewis acid-base pair catalyst. The synthesized PCACs are pure well-defined ABA triblock all-polycarbonate, which is supported by 1 H NMR, gel permeation chromatography (GPC), and diffusion-ordered spectroscopy (DOSY). A simple modification by grafting alkylthiol chains to PCAC results in excellent TPEs named PCAC-g-S-C a H 2a+1 (PCASaC). The synthesized TPEs are characterized by atomic force microscopy (AFM), thermogravimetric analysis (TG), differential scanning calorimetry (DSC), and mechanical test. They demonstrate a semi-network and semi-domain phase separation structure, wide service temperature range, good strength, high elongation, and extremely high elastic recovery properties. This low-cost, biodegradable, high-performance TPE shows great potential for applications in biomedical, wearable products, sports equipment, and other fields.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Dewang Zeng,Yu Qiu,Li Ma,Min Li,Dongxu Cui,Shuai Zhang,Rui Xiao
The chemical looping process is promising for CO2 conversion because of the much higher CO2 conversion efficiency than the photocatalytic and electrocatalytic processes. Conventional oxygen carriers have to include a high content of inert support, typically Al2O3, to avoid sintering, thus leading to a trade-off between reactivity and stability. Here, we propose the use of ion-conductive GdxCe2–xO2−δ (GDC) to prepare the supported oxygen carriers. The resulting Fe2O3/GDC materials achieve both high reactivity and stability. Fe2O3/Gd0.3Ce1.7O2−δ shows high CO productivity (∼10.79 mmol·g–1) and CO production rate (∼0.77 mmol·g–1·min–1), which are twofold higher than that of Fe2O3/Al2O3. The performance remains stable even after 30 cycles. The mechanism study confirmed the rate-limiting role of the oxygen-ion conductivity, and the GDC support enhanced the oxygen-ion conductivity of oxygen carriers during the redox reactions, thus leading to improved CO2 splitting performance. A roughly linear relationship between the oxygen-ion conductivity and CO2 yield is also obtained and verified in our testing conditions. This relation can be used to predict and select oxygen carriers with high CO2 splitting performance.
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Frontiers of Environmental Science & Engineering
·
2025
·Vol. 19
·期 6
·1-14
·
IF 6.4
Zhang Tengyu,Zhang Jingxin,Zhang Pengshuai,Tong Yen Wah,He Yiliang,Yang Qing
Anaerobic digestion (AD) is a commonly used technology for facilitating carbon fixation by converting complex organic matter into volatile fatty acids and CH 4 ; however, the issue of CO 2 emission remains unresolved in AD. The formation of amorphous carbon has been identified as a more direct method of carbon fixation in AD. This study aimed to elucidate how amorphous carbon can be formed from organic matter or CO 2 by anaerobic microorganisms. The results showed that amorphous carbon was produced in the anaerobic digestion of inorganic and mixed carbon sources, with yields of 0.38 and 3 µg/10 5 cells, respectively. Its characteristics were analyzed using Raman microscopy. Isotope labeling revealed that CO 2 fixation into amorphous carbon primarily depends on the reversed oxidative tricarboxylic acid cycle (roTCA) and hydroxycaproate. Differential pulse voltammetry combined with gene abundance analysis indicated that flavin electron bifurcation (EB) is involved in electron transfer. The microbial isothermal calorimeter further measured the metabolic calorific value, demonstrating that anaerobic microorganisms can autotrophically fix CO 2 with energy provided by EB. Metagenomic analysis supported the large REDOX equivalents input from EB to sustain the roTCA cycle. This research contributes to understanding the mechanism of CO 2 fixation into solid carbon in anaerobic environments. Additionally, it provides new insights into the potential development of carbon-negative technologies in anaerobic biological treatment.
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JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Songwei Li,Xu Jiang,Hongguang Sun,Shanshan He,Liling Zhang,Lu Shao
Herein, for the first time, mesoporous dendritic fibrous nanosilica (DFNS) is utilized to fabricate mixed matrix membranes (MMMs) to increase the membrane properties and push gas separation performance of low-molecular-weight polyethylene glycol (PEG) impregnated MMMs toward superior CO 2 capture. The basic physicochemical and gas transport properties of various membranes have been examined in detail for clarifying the mechanism of the significant enhancement in membrane performance. The polymer chains around the DFNS became rigidly according to the enhanced T g of the MMMs, gas permeability of the gas improved mainly ascribe to the increase of gas diffusivity . Because of the high porosity of DFNS with the mainly specific pore size range of 2–4 nm, the incorporation of novel mesoporous DFNS in cross-linked CO 2 -philic poly (ethylene oxide) (PEO) matrix can not only promote gas transportation, but also increase the loading rate of low-molecular-weight PEG in membranes. Meanwhile, the introduction of PEGDEM-500 into the DFNS reduces the influence of non-selective interface on the selectivity. We identified the optimized performance of low-molecular-weight PEG impregnated PEO-based MMMs demonstrates the superior CO 2 permeability (up to 2281.1 Barrer, a 478.5% increment than that of original UV cross-linked PEO membrane) and high selectivity (up to 48.1 for CO 2 /N 2 ), which can easily surpass the (2008) Robeson's Upper Bound. The long-term stability of our membrane is also excellent, which makes great promise for CO 2 capture in CCS towards sustainably environmental remediation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaohong Ma,Danyang Li,Yuheng Jiang,Huacheng Jin,Liuyang Bai,Jian Qi,Feifei You,Fangli Yuan
Utilizing solar energy to convert carbon dioxide (CO 2 ) into chemical fuels could simultaneously mitigate the greenhouse effect and fossil fuel crisis. Herein, a heterogeneous photocatalyst of ZnO nanofiber deposited by Pt nanoparticles was successfully synthesized toward photocatalytic CO 2 reduction via radio-frequency thermal plasma and photo-deposition method. The Pt nanoparticles were introduced on the surface of ZnO nanofibers to broaden the light absorption and utilization, increase the additional reaction active sites and facilitate the separation of photo-generated electron/hole pairs. Combined with the natural advantages of short transfer path of charge carriers and self-support effecting in humid reaction environment for nanofibers, the Pt/ZnO hetero-junction nanocomposites displayed superior photocatalytic activity for CO 2 reduction with respect to bare ZnO nanofibers, affording a CO-production rate as high as 45.76 μmol g −1 h −1 under 300 W Xe lamp irradiation within a gas–solid reaction system. Furthermore, in-suit Fourier transform infrared (FTIR) spectra were applied to unveil the details during photocatalytic CO 2 reduction. This work presents a hetero-junction nanocomposite photocatalyst based on eco-friendly semiconductor and metal materials.
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