CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Peng Wang,Jian Sun,Yafei Guo,Chuanwen Zhao,Weiling Li,Guodong Wang,Su Lei,Ping Lu
The development of K 2 CO 3 -based sorbents with desirable CO 2 capture capacity and mechanical property is highly necessary for its large-scale application. In this work, a range of extruded-spheronized K 2 CO 3 -based pellets containing different K 2 CO 3 loading (30–70 wt%) and Al 2 O 3 -based supports (i.e., activated alumina, Bayer aluminum hydroxide, kaolinite clay and calcium aluminate cement) were prepared for CO 2 capture. It is found that the distinct textural properties of different supports result in the obvious diversities in CO 2 uptake and mechanical property of K 2 CO 3 -based pellets. The activated alumina-supported sorbent pellets loaded with 50 wt% of K 2 CO 3 possess the highest CO 2 adsorption capacity of 2.29 mmol/g. It is mainly attributed to the moderate amounts of active component contributing to good textural properties and abundant CO 2 -philic sites, whereas excessive K 2 CO 3 loading will cause the destruction of porous structure, consequently the inferior CO 2 uptake. Moreover, the addition of 15 wt% of urea can furher enhace CO 2 uptake of the activated alumina-supported sorbent pellets loaded with 50 wt% of K 2 CO 3 , ∼3.10 mmol CO 2 /g. The improved CO 2 uptake is due to the significantly enhanced porosity of sorbent pellets as a result of urea decomposition. In addition, the urea-templated sorbent pellets still maintain the high compressive strength (18.96 MPa) and good attrition resistance (a weight loss of 0.59% after 4000 rotations).
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2023
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IF 1.8
Kai Fei,Zhuo Yi Dong,Li Shi,Xuan Meng,Naiwang Liu
Transformer oil plays a critical role in ensuring the insulation and normal operation of power transformers. However, during operation, the transformer oil would undergo oxidation and degradation, leading to the formation of acids and polar compounds that increase its acidity and degrade its performance. Hence, the recycling and regeneration of aged transformer oil is an essential practice in transformer maintenance, contributing significantly to the extension of a transformer's operational lifespan and the reduction of potential risks. Adsorption separation is a preferred method for regeneration, offering simplicity and high efficiency. This study focuses on impregnated γ-Al 2 O 3 as an adsorbent for acidity removal in waste transformer oil. We conducted static adsorption experiments to investigate the optimal loading amount of the active component and the best calcination temperature for acid removal. XRD technique is employed to monitor the phase changes of the carrier during the calcination process. BET analysis is used to observe variations in the specific surface area and pore volume of the adsorbent during the modification process. DTG-TGA is utilized to assess the weight loss during the calcination process. FTIR is employed to observe changes in functional groups during modification and adsorption processes. Along with these investigations, a study is also carried out to assess the dynamic acid removal performance of the acid-removing adsorbent loaded into a fixed bed. The findings contribute to the development of sustainable methods for regenerating transformer oil, ensuring efficient and environmentally friendly operations.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Zongze Lv,Changlei Qin,Shuzhen Chen,Dawid P. Hanak,Chunfei Wu
CO 2 capture and utilization has been considered as an up-and-coming short- to mid-term approach to mitigate the excessive CO 2 emission. Comparing to the conventional separate capture, transportation and conversion arrangement, the integrated CO 2 capture and utilization (ICCU) could largely simplify the complex process and reduce the energy consumption. However, the poor stability of high-temperature CO 2 sorption/desorption severely limit the potential of ICCU. Therefore, it is indispensable to develop a new sorbent/catalyst system ensuring the high-efficiency and long-term operation of the ICCU. In this paper, we propose and demonstrate the feasibility and performance of using K 2 CO 3 -doped Li 4 SiO 4 as an efficient CO 2 sorbent for ICCU operating at a relatively low temperature by dry reforming of methane. Results show that the ratio of H 2 /CO produced is stabilized at 1 ± 0.05 in the pre-breakthrough stage, and the duration extends to be 1.6 times of the original value in the cyclic operations, displaying an excellent performance in reaction matching and process stability.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2026
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IF 8.4
Qihang Zhou,Ruijiang Qian,Haoyi Yao,Qingming Zhang,Mingpeng Zhao,Wen Ge,Shukang Deng,Peizhi Yang
Biomass-derived carbon materials have attracted extensive attention for supercapacitor electrodes due to their sustainability and low cost. Notably, Hericium erinaceus , a natural biomass with a unique three-dimensional porous structure and high protein/polysaccharides content, has rarely been explored as a carbon precursor for supercapacitor electrodes. Herein, Hericium erinaceus is employed as a novel carbon precursor, and K 2 CO 3 is used as an activator to prepare oxygen/nitrogen self-doped hierarchical porous carbon via a low-temperature carbonization-high-temperature activation strategy. Benefiting from the moderate etching effect of K 2 CO 3 , the as-prepared carbon material possesses a well-developed micro-mesoporous hierarchical structure, which facilitates ion diffusion and electron transfer. Electrochemical tests demonstrate that the optimal sample (HEPC-3) delivers a specific capacitance of 300 F g −1 at a scan rate of 0.5 A g −1 , along with excellent rate capability. Furthermore, the HEPC-3//HEPC-3 symmetric supercapacitor achieves an energy density of 14.5 Wh kg −1 at a power density of 57.9 W kg −1 , and maintains a specific capacitance retention rate of 107% after 10,000 cycles at 100 mV s −1 . This work systematically clarifies the structure-performance relationship regulated by K 2 CO 3 activation, providing a new strategy for the design of high-performance biomass-derived carbon electrodes for supercapacitors.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2025
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IF 4.7
Longjie Xiao,Hongkui Zhang,Xue Song,Yongde Liu,Jie Zhang,Feiyue Wang,Guihua Yan,Han Zhang,Tianzeng Jin,Jihong Zhao
This study investigated the competitive adsorption behavior and underlying mechanism of a potassium carbonate-activated sycamore flocculent biochar (KBC-SF) for the simultaneous removal of oxytetracycline hydrochloride (OTC-HCl) and ciprofloxacin (CIP) from aqueous environments. The structural and surface properties of KBC-SF were comprehensively characterized using SEM, FTIR, Raman spectroscopy, XPS, and N 2 adsorption–desorption analysis (BET). OTC-HCl and CIP concentrations quantified by validated UV–Vis spectrophotometry. The biochar exhibited a high specific surface area (1651 m 2 /g) and abundant oxygen-containing functional groups. In binary systems, maximum adsorption capacities at 45 °C reached 533 mg/g for OTC-HCl and 366 mg/g for CIP, which were substantially lower than those in single-solute systems, indicating significant competitive antagonism with OTC-HCl showing stronger affinity. The adsorption followed pseudo-second-order kinetics and was best described by the Freundlich isotherm, suggesting multilayer chemisorption. Thermodynamic parameters confirmed that the process was spontaneous and endothermic. Despite moderate interference from coexisting ions (e.g., Al 3+ , CO 3 2− ) and various real water matrices, KBC-SF maintained nearly complete removal efficiency. The adsorption process was dominated by π–π electron donor–acceptor (EDA) interactions, hydrogen bonding, and pore filling. These findings highlighted the excellent applicability and robustness of KBC-SF for removing coexisting antibiotics in complex aquatic environments.
研究领域:
环境科学
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环境污染与控制
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环境功能材料
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水处理技术
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吸附化学
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DOI
高影响因子
PHARMACEUTICAL CHEMISTRY JOURNAL
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2017
·Vol. 51
·期 6
·491-493
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IF 0.445
Zhu Jian,Jin Zhi-Min
Insoluble camptothecin was converted into the corresponding hydrosoluble analog, camptothecin carboxylate, by using 1,1,3,3-tetramethylguanidine as hydrolyzing agent. The ethanol/K 2 CO 3 /H 2 O aqueous two-phase system was established to extract the hydrosoluble camptothecin carboxylate. Through two-stage extraction from crude camptothecin of 5.4%, purity, final hydrosoluble camptothecin was obtained with a purity of 98.5% at a total yield of 78.4%.
研究领域:
药物化学
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分离工程
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高影响因子
Greenhouse Gases-Science and Technology
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2018
·Vol. 9
·期 1
·10-18
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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.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 6
·e202405266
·
IF 2
Boao Du,Lihui Zheng
Graphical This research focuses on supercapacitor electrode materials. Using Rhus typhina leaves as raw materials, it innovatively employs a mixed activator of K 2 CO 3 and ZnCl 2 Through a two-step carbonization-activation method, O/N self-doped TLMPC-x is prepared. Among them, TLMPC-1.0 exhibits outstanding performance, with a large specific surface area, high specific capacitance, and strong cycle stability, demonstrating promising application prospects. This research focuses on the field of supercapacitor electrode materials. Using Rhus typhina leaves as the starting material, it innovatively applies a mixed activator composed of K 2 CO 3 and ZnCl 2 and successfully prepares O/N self-doped leaf-derived porous carbon electrode materials (TLMPC-x) through a precisely controlled two-step carbonization-activation method. The aim is to develop a new type of electrode material that combines excellent performance, environmental friendliness, and the advantage of low cost, and to deeply explore the mechanism of the effect of the activator ratio on the specific surface area and electrochemical performance of the materials. Among them, TLMPC-1.0 remarkably exhibits a specific surface area as high as 2827.9 m 2 g −1 . Its abundant and multi-level pore structure complements well with the diverse heteroatom doping. During the electrochemical performance test in the KOH electrolyte system, the specific capacitance of this material excellently reaches 335.3 F g −1 , and the capacitance retention rate is stably maintained at 69%. When the power density is 250 W kg −1 , an energy density of 9.45 Wh kg −1 can be achieved. Moreover, after 20 000 charge–discharge cycles, its capacitance retention rate is still as high as 96.4%, demonstrating extremely excellent electrochemical performance and ultra-stable cycle stability.
研究领域:
材料科学
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能源存储
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环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Yang-Hai Zheng,Wen-Hao Wang,Yun-Xue She,Yue-Lin Wang,Tong Shen,Sheng-Rong Guo,Yun Xue,Yong-De Yan
To address the disposal challenge of radioactive cellulose-based protective equipment (e.g., gloves) from nuclear power plants, this study evaluated the oxidation behavior of Sr-doped gloves via Molten Salt Oxidation (MSO) technology, comparing three molten salt systems (chloride, carbonate, nitrate). Key analysis focused on oxidation efficiency, residue characteristics, and Sr immobilization mechanisms. Experimental results identified the ternary eutectic carbonate system (Li₂CO₃-Na₂CO₃-K₂CO₃) as the optimal, featuring a low eutectic temperature (393 °C), high Destruction Removal Efficiency (DRE), high Capacity Reduction Efficiency (CRE), good thermal stability, and non-corrosiveness. Resource conservation and oxidation efficiency were balanced at a salt-to-waste mass ratio of 1:2. Sr showed two temperature-dependent effects: it accelerated cellulose degradation and decreased activation energy (from 98.194 kJ·mol −1 to 94.942 kJ·mol −1 ) at >450 °C, but it hindered oxidation at <400 °C (molten salt not totally molten). In order to achieve atomic-level immobilization, Sr first produced SrO at 400–450 °C. At ≥500 °C, a spontaneous reaction (Gibbs free energy <0) converted Sr into thermally stable SrCO₃ (decomposition Gibbs free energy >0), at 800 °C, the Sr interception rate reached 95.1%. This study confirmed MSO with the ternary carbonate system (1,2 ratio) achieves deep mineralization of organic matter in radioactive gloves while efficiently immobilizing Sr. It overcomes defects of traditional methods (incineration causing nuclide volatilization, vitrification consuming high energy, cement solidification having a high leaching rate), providing a safe, efficient, and eco-friendly solution for radioactive personal protective equipment disposal in nuclear power plants.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Chuanwen Zhao,Yafei Guo,Weiling Li,Changsheng Bu,Xinye Wang,Ping Lu
K 2 CO 3 -modified silica aerogels (K 2 CO 3 /SG) were synthesized by the two-step sol-gel and wet impregnation method using K 2 CO 3 and tetraethoxysilane (TEOS) as starting materials and ethanol as solvent. CO 2 sorption behaviors of the sorbent were tested under ultra-dilute flue gas conditions of 20–60 °C, 1%CO 2 , 2%H 2 O and balanced N 2 with gas hourly space velocity (GHSV) of 4000 h −1 using a modified fixed-bed reactor. Experimental CO 2 uptakes of the sorbent under different temperatures were correlated to several kinetics models to study the kinetics performances. The effects of temperature, K 2 CO 3 loading, GHSV, H 2 O:CO 2 molar ratio and H 2 O pretreatment time on CO 2 sorption capacity and kinetics performances of the sorbent were further demonstrated. It is found that the two-step sol-gel and wet impregnation method could benefit the sorbent improved physical properties, superior surface characteristics and enhanced CO 2 sorption performances. Amongst various kinetics equations, the modified Avrami fractional kinetics model could well describe the CO 2 sorption process over K 2 CO 3 /SG. CO 2 sorption capacity decreases with the increase of temperature. With the increasing K 2 CO 3 loading, GHSV, H 2 O:CO 2 molar ratio and H 2 O pretreatment time, CO 2 sorption capacity increases first and then decreases. CO 2 sorption kinetics increases with the increasing temperature and H 2 O pretreatment time, while it decreases with the increasing K 2 CO 3 loading. CO 2 sorption kinetics keeps rather stable and then increases significantly with the increasing GHSV and H 2 O:CO 2 molar ratio.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jiaxing Wang,Shuping Zhang,Mei Jiang,Xinguang Huo,Yuanquan Xiong
A staged K 2 CO 3 -mediated polygeneration process for rice husk was developed. • Catalytic torrefaction achieved deoxygenation and in-situ acid fixation. • Fractional condensation yielded monocyclic phenols with 85.53% relative purity. • In-situ K 2 Si 4 O 9 templating created 3D honeycomb porous carbon structure. • A closed-loop strategy achieved over 74% potassium recovery rate. To address high bio-oil acidity, complex compositions, and catalyst recovery difficulties during high-ash biomass pyrolysis, this study proposes a K 2 CO 3 -mediated staged catalytic thermal conversion process for rice husk. The regulatory mechanism on multiphase products and potassium migration fate was systematically investigated. During catalytic torrefaction (240–270 °C), K 2 CO 3 induced significant biomass pre-deoxygenation, releasing abundant oxygen as CO and CO 2 . This stage achieved targeted extraction of primary phenolic compounds (56.34%, predominantly guaiacol and its derivatives) while converting organic acids into solid potassium salts. This pretreatment effectively stripped acidic precursors, blocking secondary tar condensation during the main pyrolysis (550 °C) and yielding a highly deacidified bio-oil. Coupled with fractional condensation, monocyclic phenol purity in the 60 °C fraction reached 85.53% (versus 23.96% in direct pyrolysis), while the methane content in the syngas increased to 60.9%. The migration fate and occurrence forms of potassium were systematically tracked, revealing that over 74% of potassium remained in a water-soluble state post-pyrolysis. Regarding solid-phase evolution, active potassium etched the silica skeleton at elevated temperatures to form a K 2 Si 4 O 9 template. Its subsequent removal via mild water washing created a 3D honeycomb porous biochar, concurrently achieving a > 74% water-soluble potassium recovery rate. Based on these findings, a comprehensive strategy integrating heat integration potential, soluble silicate valorization, and catalyst recycling is proposed. Download: Download high-res image (335KB) Download: Download full-size image
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高影响因子
ENERGY & FUELS
·
2016
·
IF 2.835
Qiangwei Li,Yi Wang,Shanlong An,Lidong Wang
Using a K2CO3/piperazine (PZ) mixture as a typical phase-change absorbent has promising applicability for carbon dioxide (CO2) capture in coal-fired power plants that would contribute to low energy consumption for solvent regeneration. In this study, the reaction rate of CO2 with a concentrated K2CO3/PZ mixture was measured in a wetted-wall column. At a CO2 loading close to saturation absorption, correlative physical parameters were calculated. The effects of operating conditions, including gas flow rate, slurry flow rate, PZ concentration, CO2 loading, K2CO3 mass fraction, and temperature, on the absorption rate of CO2 were investigated. The results showed that the absorption rate was sensitive to the effects of the gas flow rate and CO2 loading. The PZ concentration and K2CO3 mass fraction also substantially influenced the CO2 absorption rate. However, minor changes in the CO2 absorption rate were observed when the slurry flow rate and temperature were increased. On the basis of a pseudo-first-order model, the absorption rate determined in this study was found to be controlled by mass transfer in both the gas film and the liquid film. The results can serve as a useful reference for designing CO2 removal systems using K2CO3/PZ mixtures.
研究领域:
化学工程
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环境科学
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能源技术
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气体分离
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工业催化
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DOI
高影响因子
危险品化学品经营许可证（带存储）