CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Qiliang Zhu,Wenxuan Huang,Jianhua Shen,Haibo Jiang,Yihua Zhu,Chunzhong Li
Metal halide perovskite nanocrystals have garnered significant attention in the realm of photocatalytic CO 2 reduction in recent years owing to their remarkable reducing properties and high selectivity. However, the issue of low photocatalytic activity due to severe carrier recombination phenomena in perovskite has posed a significant challenge. To address this, a one-pot in-situ preparation strategy was employed to create a BiOBr/Bi-doped perovskite nanocrystal S-scheme heterojunction, resulting in a significant improvement in the CO 2 photoreduction performance. The heterojunction material exhibited a CO yield of 151.56 μmolg -1 h −1 , with a selectivity for CO of 93.6 %. The molar ratio of the components was modulated using an in-situ water aging strategy, yielding a photocatalyst performance that exceeded that of pure BiOBr. The synthesis strategy of one-step in-situ preparation of heterojunctions overcomes the problem of insufficient bonding caused by two-step methods. And various characterizations and DFT calculations strongly support the S-scheme mechanism of the photocatalyst. The active site effectively reduces the energy barrier for the transition from *COOH to *CO intermediate, thereby significantly improving photocatalytic activity.
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Nanomaterials
·
2024
·Vol. 14
·期 15
·1280
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IF 4.4
Liyuan Cai,Jingchun Wu,Miaoxin Zhang,Keliang Wang,Bo Li,Xin Yu,Yangyang Hou,Yang Zhao
Carbon Capture, Utilization, and Storage (CCUS) stands as one of the effective means to reduce carbon emissions and serves as a crucial technical pillar for achieving experimental carbon neutrality. CO2-enhanced oil recovery (CO2-EOR) represents the foremost method for CO2utilization. CO2-EOR represents a favorable technical means of efficiently developing extra-low-permeability reservoirs. Nevertheless, the process known as the direct injection of CO2is highly susceptible to gas scrambling, which reduces the exposure time and contact area between CO2and the extra-low-permeability oil matrix, making it challenging to utilize CO2molecular diffusion effectively. In this paper, a comprehensive study involving the application of a CO2nanobubble system in extra-low-permeability reservoirs is presented. A modified nano-SiO2particle with pro-CO2properties was designed using the Pickering emulsion template method and employed as a CO2nanobubble stabilizer. The suitability of the CO2nanobubbles for use in extra-low-permeability reservoirs was evaluated in terms of their temperature resistance, oil resistance, dimensional stability, interfacial properties, and wetting-reversal properties. The enhanced oil recovery (EOR) effect of the CO2nanobubble system was evaluated through core experiments. The results indicate that the CO2nanobubble system can suppress the phenomena of channeling and gravity overlap in the formation. Additionally, the system can alter the wettability, thereby improving interfacial activity. Furthermore, the system can reduce the interfacial tension, thus expanding the wave efficiency of the repellent phase fluids. The system can also improve the ability of CO2to displace the crude oil or water in the pore space. The CO2nanobubble system can take advantage of its size and high mass transfer efficiency, among other advantages. Injection of the gas into the extra-low-permeability reservoir can be used to block high-gas-capacity channels. The injected gas is forced to enter the low-permeability layer or matrix, with the results of core simulation experiments indicating a recovery rate of 66.28%. Nanobubble technology, the subject of this paper, has significant practical implications for enhancing the efficiency of CO2-EOR and geologic sequestration, as well as providing an environmentally friendly method as part of larger CCUS-EOR.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Zhilin Ma,Yongda Cao,Xiujun Peng,Qiulin Yang,Chao Wang,Chang-An Zhou,Lei Song,Kui Ma,Hairong Yue
The chemical absorption method using MEA has been one of the most effective CO2 capture technologies, but the problems of low process efficiency and poor economics limit its application. In this work, the rapid phase change absorbent composed of alcohol ether solvent and potassium amino acid salt (AaK) solution was investigated, and the effects of different AaKs and ethers on the phase change behavior, phase separation mechanism, and CO2 absorption performance of the absorbent were analyzed. The results showed that when the carbon chain of the linear AaK was longer, the solubility in water was larger, and the lower liquid phase (LP) volume, phase separation time, AaK enrichment in the LP, and CO2 molar loading were larger. When the alkyl group of the branched-chain AaK was larger, the solubility in water was smaller, and the gas–liquid mass transfer, enrichment effect, and absorption rate were smaller. When the ether bonds of ether solvent were greater, the solubility of organic salts and competition for water were stronger; thus, the LP volume was smaller. Moreover, the absorption rate and CO2 loading of AaK systems were affected by the spatial structure effect of amino and carboxyl groups and the viscosity effect of solvent before absorption.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yujing Xie,Chenhui Qiu,Lei Wang,Yuxuan Wang,Jie Zhang,Jinfeng Zhang,Hui Wan,Guofeng Guan
Photocatalytic CO 2 reduction to fuels via visible light is regarded as a highly promising sustainable technology to address resource depletion and environmental apprehensions. However, the elevation of photocatalytic performance is limited due to some drawbacks of isolated catalysts such as poor CO 2 adsorption performance, inadequate utilization of visible light, and rapid recombination of photo-generated carriers. Herein, a series of novel heterojunction catalysts, 1D/2D CeO 2 /Bi 2 MoO 6 (CBMO-X), were fabricated utilizing the microwave-assisted method for the photocatalytic reduction of CO 2 . The CH 3 OH yield of the optimized CBMO-10 composite material reached 4.31 μmol⋅g −1 ⋅h −1 with excellent stability and structural integrity. Through a series of characterizations, it was found that the introduced CeO 2 nanorods served as bifunctional sites for CO 2 adsorption and photoelectron accumulation, effectively promoting CO 2 conversion under visible light. In addition, CBMO-X exhibited faster photo-generated carriers migration rate due to the formation of the II-scheme heterojunction, which improved the photocatalytic performance obviously. Furthermore, the density functional theory (DFT) calculations and in situ XPS were used to investigate the carrier migration paths on the surface of composite materials. This work provided a novel strategy for the design of photocatalysts for efficient CO 2 conversion.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Mengxiao Yan,Tingjie Mao,Tiantian Zeng,Kai Chen,Shun Wang,Juan Wang,Huile Jin
Electrochemically reducing CO2 (CO2RR) to high-value chemical products is recognized as a promising route to simultaneously reduce the consumption of fossil fuels and carbon emission. The fabrication of syngas with an appropriate H2/CO ratio by CO2RR has been widely studied, but the dynamic evolution of the catalyst is still ambiguous. Herein, the reconstruction of CuO/SnO2 nanosheets (NSs) with a heterojunction structure in the CO2RR process was reported by an in situ X-ray diffractometer technique. The products of the CO2RR on the optimized CuO/SnO2 NSs are CO and H2, achieving a nearly 100% total Faraday efficiency. Moreover, the resulting syngas is maintained at a constant 2:1 ratio of H2/CO over a wide potential of −0.8 to −1.2 V versus the reversible hydrogen electrode. Importantly, the detailed characterizations show that Cu2+ is reduced to Cu during the CO2RR process, while the valence state of Sn remains stable. This study presents strong experimental support for the dynamic evolution process of electrocatalysts in other energy conversion fields.
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Nano Research
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2024
·
IF 9.5
Li Jing,Jing Chuanyong,Wang Jin
Electrocatalytic CO 2 reduction to CH 4 remains challenging due to multi-electron transfer and intermediates adsorption. Herein, we synthesized electrocatalysts by growing Ni-Cu alloy structure on nitrogen-doped carbon nanotubes (Ni x Cu y -NCNT) for electrocatalytic CO 2 reduction reaction (CO 2 RR) via hydrothermal method followed by pyrolysis. The optimized Ni 1 Cu 1 -NCNT demonstrated a superior CO 2 RR performance, achieving 99.7% \(\text{FE}_{\text{CH}_{4}}\) (FE = Faradaic efficiency) and 11.54 mA • cm −2 current density at −1.2 V vs. reversible hydrogen electrode (RHE), which outperformed single metal counterparts. Its outstanding performance was due to the electrons transferred from Cu to Ni and Ni-Cu alloy shifted the d-band center toward the Fermi level, which was more conducive to the intermediate formation. In situ electrochemical attenuated total reflection (EC-ATR) and density functional theory (DFT) calculations revealed the appearance of *CHO intermediate and the pathway during the CO 2 RR process. The design of the bimetallic electrocatalyst in this study provides a new perspective for the highly selective reduction of CO 2 .
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INDUSTRIAL CROPS AND PRODUCTS
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2024
·
IF 5.6
Wenjing Zhao,Shanjian Liu,Ning Li,Jiawen Zhang,Guanshuai Zhang,Shuntao Xu
The product distribution of cellulose pyrolysis at varying nitrogen carrier and temperature was studied in a tube furnace, elucidating the reaction mechanism of cellulose and urea (chitosan) in CO 2 pyrolysis. The nitrogen-rich pyrolysis in CO 2 atmosphere improves the nitrogen compound content in bio-oil. CO 2 , serving as a mild oxidizing agent, enhances the production and release of biochar volatiles and the creation of additional pores. This leads to an improved development of porosity across the micropore, mesopore, and macropore ranges. When the mixing ratio of urea is 60% at 550 ℃, the highest nitrogen compound content is 45.03%, which is 1.7 times higher than that in N 2 atmosphere. When the mass mixture ratio of chitosan is less than 60%, its content reaches its maximum at 500 ℃, reaching 13.32%, which is 1.2 times the content under N 2 atmosphere. The formation paths of oxygen compounds (aldehydes, ketones and alcohols) and main nitrogen compounds (pyridine, pyrrole, imidazole and pyrazine) in bio-oils under CO 2 atmosphere are discussed. The coupling relationship between biochar N functional groups and the generation of bio-oil N heterocyclic substances was proposed.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2025
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IF 6
Qinghai Long,Jing Wang,Tiantian Ping,Shufeng Shen
Nonaqueous absorbents have shown great potential in lowering regeneration energy for energy-efficient CO 2 capture. The effect of reaction media with varying solvent characteristics (polarity, solubility parameter and dielectric constant) on kinetic behaviors deserves to be discovered. In this work, CO 2 absorption flux against CO 2 partial pressure was determined in a stirred cell reactor at temperatures of 283.2–303.2 K with 1.0–5.0 mol L −1 2-(butylamino)ethanol (BAE) in nonaqueous 2-butoxyethanol (2-BE). Physicochemical properties and the physical mass transfer coefficients were also measured and represented by proposed correlations. The overall reaction rate constants were derived under the well-defined pseudo-first-order regime conditions. The partial reaction order with respect to BAE was found to be about 2.0 in 2-BE and 1.0–1.3 in water respectively, which reveals that the formation of ionic products may be highly depressed in solvent with low Hansen solubility parameter (HSP) resulting in the increasing reaction order. The overall third-order kinetic data can be well represented by termolecular mechanism model with AARD of 10.5 %. The findings will provide fundamental support for further pilot-scale performance demonstration.
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BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Kai Xin,Jun Cheng,Ruhan Guo,Lei Qian,Yulun Wu,Weijuan Yang
To effectively improve biomass growth and flue-gas CO 2 fixation of microalgae, acid-tolerant Euglena gracilis was modified with cobalt-60 γ-ray irradiation and polyethylene glycol (PEG) adaptive screening to obtain the mutant strain M800. The biomass dry weight and maximum CO 2 fixation rate of M800 were both 1.47 times higher than that of wild strain, which was attributed to a substantial increase in key carbon fixation enzyme RuBisCO activity and photosynthetic pigment content. The high charge separation quantum efficiency in PSII reaction center, efficient light utilization and energy regulation that favors light conversion, were the underlying drivers of efficient photosynthetic carbon fixation in M800. M800 had stronger antioxidant capacity in sufficient high-carbon environment, alleviating lipid peroxidation damage. After adding 1 mM PEG, biomass dry weight of M800 reached 2.31 g/L, which was 79.1 % higher than that of wild strain. Cell proliferation of M800 was promoted, the apoptosis and necrosis rates decreased.
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ENERGY & FUELS
·
2025
·
IF 5.3
Zhuo Chen,Ze Zhang,Rongxin Xia,Junhu Zhou,Jun Cheng
To improve the conversion rate of carbon dioxide (CO2) to methane (CH4) in a microbial electrochemical system (MES), the zeolitic imidazolate framework ZIF-67(Co) with electron storage properties was first grown in situ on MIL-100(Fe) with excellent CO2 adsorption properties by a hydrothermal method. The obtained binary core–shell MIL@ZIF material was then adsorbed by carbon felt on a cathode to grow biofilms composed of electroactive microorganisms for characterization and testing in an MES. This system exhibited a CH4 production rate of 0.42 mmol LR–1 d–1, along with an impressive faradaic efficiency of 96.4%. Three-dimensional excitation–emission matrix spectra of extracellular polymeric substances indicated that those containing higher contents of humic acid shifted electron pairs and converted redox states to facilitate electron transfer. MIL@ZIF enriched hydrogenotrophic methanogens and electrogenic bacteria in microbial communities with enhanced gene expression of electrically conductive pili and cytochrome C to strengthen interspecies electron transfer. MIL@ZIF enhanced CO2 adsorption and electron storage, reinforcing electron transfer chains and boosting CH4 yield by a factor of 10.7.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Li-Yang Shao,Shuo Wang,Shu-Ni Li,Jie Meng,Jiao-Na Yue,Wen-Yu Yuan,Ying Wang,Quan-Guo Zhai
Developing catalysts with excellent CO2 capture capability and electrochemical CO2 reduction reaction (CO2RR) at a wide potential range simultaneously is significant but remains a formidable challenge. Here, two novel InMg defective trinuclear cluster-based MOFs (SNNU-41 and SNNU-42) with abundant p-block unsaturated coordinated sites were reported and exhibited good CO2 capture and CO2RR performance simultaneously. Due to the suitable micropores, SNNU-41 showed higher CO2 capture ability at different adsorption pressure conditions. On account of the rigid framework and the closer p band center to Fermi level, SNNU-42 accelerated the conversion of CO2 molecule to C1 efficiency. Notably, via adjusting the ratio of p-block metal (In) in the SNNU-42 framework, the performance of the CO2RR was promoted drastically. SNNU-42 with the InMg (1:1.8) mixed cluster delivered an excellent Faradaic efficiency of 91.3% for C1 products and high selectivity of 72.0% for HCOOH at −2.5 V (vs Ag/Ag+) with a total current density of 77.2 mA cm–2. This work provides a possibility for efficient CO2 capture and CO2RR electrocatalysts through the modulation of electronic structures and composition in MOFs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yangyang Dai,Tian Fang,Shumin Li,Yuanyuan Wang,Suyue Zhong,Wenjun Su,Jian Li
While mixed matrix membranes (MMMs) containing two-dimensional (2D) layered materials (such as, GO, g-C 3 N 4 and MXene , etc.) have revealed potential application prospects for gas separation applications, it still faces a serious challenge to enhance the performance of CO 2 separation. Owing to the structural defects of g-C 3 N 4 nanosheets produced during the exfoliation process, which has greatly reduced the gas selectivity. Herein, we describe the construction of g-C 3 N 4 -MXene/Pebax MMM composed by MXene modified the structural defects in g-C 3 N 4 nanosheets to surmount the low gas selectivity of g-C 3 N 4 membrane. However, the stacking of nanosheets on each other hinder the gas transport channels. The TiO 2 nanoparticles derived in-situ from MXene semi-oxidation can support an intermediate layer between g-C 3 N 4 nanosheet and MXene nanosheet to expand the gas transport channels. Eventually, a novel g-C 3 N 4 -TiO 2 @MXene/Pebax MMM was obtained that exhibited maximum CO 2 permeability of 1673.69 Barrer in separation of CO 2 /CH 4 , CO 2 /N 2 selectivity of 45.13, and CO 2 /CH 4 selectivity of 47.76, exceeding the bond 2008 limit on Robeson. What's more, the MMM within 100 h (1 bar and 298 K) are measured to have outstanding separation performance. Overall, this concept offers a novel strategy to enhance CO 2 separation by MXene modified defects in g-C 3 N 4 nanosheets.
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