Carbon Capture Science & Technology
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2025
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IF 10.5
Tingwei Wang,Xuelong Quan,Zhiqiang Sun,Zhao Sun
Excessive CO 2 emissions lead to a gradual increase in global average temperatures and an increased frequency of extreme weather events. Exploiting advanced materials for CO 2 capture has become a key issue of concern to all countries. In this study, a new biomass carbonization strategy, co-modification by H 2 O 2 and KOH, is proposed to prepare microporous biochar from pine sawdust with high CO 2 adsorption capacity. Results indicate that the co-modification strategy can produce biochar with a specific surface area as high as 3522.7 m 2 /g (with a micropore ratio of 90.3%), which increases by 56.7% compared to the biochar produced by biomass carbonization without H 2 O 2 treatment. The adsorption properties of the co-modification-derived biochar are investigated by CO 2 -TPD and TG, and the biochar exhibits a maximum CO 2 adsorption capacity of 6.60 mmol/g at 30°C and retains over 91.2% of this capacity after 10 cycles. It is revealed that H 2 O 2 -KOH modification can significantly promote the physisorption capacity of the biochar, highlighting the enhanced CO 2 capture efficiency due to alkaline hydrogen peroxide treatment on the biochar and its enhancement in CO 2 capture.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2024
·
IF 6.9
Gao Feiyue,Zhou Chuncai,Shi Jiaqian,Huang Yan,Li Wenwen,Liu Guijian,Li Xin
Coal tar residue (CTR) is a hazardous industrial waste and its appropriate disposal evokes great concerns. In this work, superb surface area porous carbon was synthesized from extracted residue in CTR through one-pot KOH chemical activation and applied for phenol adsorption. Results revealed that micro-mesoporous porous carbon (MPC-3–850) with ultrahigh specific surface area of 5465 m 2 /g, and multiple oxygen-containing functional groups was synthesized at optimized conditions (mass proportion of KOH/MCTR was 1:3, pyrolysis temperature was 850℃). Adsorption results showed that the optimized absorbent dosage was 2 g/L, and adsorptive equilibrium time was 120 min. Maximum adsorption capacity of MPC-3–850 in experiment was reached higher than 360 mg/g and decreased at elevated temperatures. Near neutral conditions (pH=6–8) and lower co-existing ions (Mg 2+ , K + , Na + ) strength had a slightly effect on adsorption performance. Adsorption process adhered to pseudo-second-order kinetic and Freundlich isotherm models, and was exothermic and spontaneous. The adsorption mechanism included pore filling, van der Waals forces, electron donor-acceptor interaction, hydrogen-bonding interaction, and π-π interaction. MPC-3–850 had a good ability to adsorb phenol in real coke wastewater and excellent adsorption capacity after 4 desorption-adsorption cycles.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2026
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IF 4.4
Jing Chenglong,Zhou Zilong,Zeng Fanen,Xue Xiuna,Sun Zhidong,Pei Liping,Yu Hongbo,Xu Bing
With the increasing demand for sustainable energy storage devices, biomass-derived carbon materials have been regarded as promising electrode candidates for supercapacitors because of their renewability, low cost, and environmental compatibility. As abundant agricultural wastes, peanut shells remain largely underutilized; therefore, their conversion into high-value carbon materials is of considerable significance for waste valorization and energy storage applications. In this work, peanut shell-derived porous carbon was prepared by pre-carbonization followed by high-temperature KOH activation. During activation, the carbon skeleton was effectively etched by KOH, generating abundant micropores and a hierarchical pore structure. The optimized PHPC-800-2 exhibits a well-developed multidimensional porous network, a high specific surface area of 1668.77 m 2 g −1 , a total pore volume of 0.69 cm 3 g −1 , and a moderate micropore-to-mesopore ratio, thereby providing abundant active sites and efficient ion transport pathways. Electrochemical tests demonstrate that in a three-electrode system, the PHPC-800-2 electrode delivers a high specific capacitance of 240.65 F g −1 at a current density of 0.5 A g −1 ; when the current density is increased to 5 A g −1 , the specific capacitance is 205.5 F g −1 , still retaining 85.4% of the capacitance, indicating good rate capability. Furthermore, the symmetric supercapacitor assembled based on PHPC-800-2 exhibits a high specific capacitance of 91.6 F g −1 at a current density of 0.5 A g −1 , achieves an energy density of 12.72 Wh kg −1 at a power density of 500 W kg −1 , and retains 99.37% of its capacitance after 20,000 charge-discharge cycles. These results demonstrate that peanut shell waste can be converted into high-performance porous carbon electrodes, providing a sustainable strategy for biomass-derived carbon materials in energy storage applications.
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DOI
高影响因子
ENERGY & FUELS
·
2026
·
IF 5.3
Zhuanqin Liu,Tong Guo,Wensheng Yang,Tinghong Gao,Yunjun Ruan
In the context of the global dual-carbon strategy, developing sustainable and high-performance electrode materials for supercapacitors is of great significance. In this work, a facile two-step method was employed to convert honeysuckle vine, an agricultural byproduct, into hierarchically porous activated carbon (HVAC) via precarbonization and KOH activation. By systematically regulating KOH/HVC mass ratio and the activation temperature, we elucidated the reaction mechanism of KOH etching. At elevated temperatures, KOH reacts with the carbon framework to generate K2CO3 and metallic K, whose continuous volatilization and migration create an interconnected pore network. The optimized sample, HVAC-6-800, exhibits a high specific surface area of 3489.04 m2 g–1, a well-developed porous structure, and oxygen doping. The HVAC-6-800 electrode delivers a high specific capacitance of 338.7 F g–1 at 1 A g–1, excellent rate capability (68% retention at 20 A g–1), and outstanding cycling stability (94% retention after 5000 cycles). Symmetric supercapacitors assembled with HVAC-6-800 electrodes in 6 M KOH and [BMIM]BF4 electrolytes achieve energy densities of 16.85 Wh kg–1 (150 W kg–1) and 49.0 Wh kg–1 (377 W kg–1), respectively, along with superior cycling performance (97% capacitance retention after 8000 cycles in KOH). This work demonstrates that honeysuckle vine-derived porous carbon is a promising, sustainable, and high-performance electrode material for supercapacitors.
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2026
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IF 7.9
Hongping He,Yong Cheng,Linhua Jiang,Youcai Zhao,Dongjie Niu,Xunchang Fei,Rong Zhang,Shijin Dai
Thermo-chemical conversion (TCC) is an effective strategy in the detoxification of waste salt (WS) containing hazardous organics, which can be enhanced by molten salt, e.g., molten NaOH-KOH. However, the microscopic process remains largely unclear. With the WS collecting from a pesticide enterprise, this study comprehensively investigated the pyrolysis and combustion behaviors based on TG and FTIR. Particularly, molten NaOH-KOH mediation was explored. The results showed that combustion appeared to be more advantageous than pyrolysis for WS detoxification. Moreover, attributing to the enhanced heat transfer and catalytic activity of molten NaOH-KOH, the detoxification was promoted, manifested as a decrease in the peaked temperature of organic reactions (from 192 ℃ to 147 ℃). In addition, the emissions of C x H y , CO, and SO 2 decreased by 55.4 %, 88.2 %, and 74.1 %, respectively, due to the trapping effect by molten NaOH-KOH. Afterwards, continuous operation was conducted, and the results showed that the total organic carbon of the treated WS reduced evidently by 75.9 %, indicating stable and satisfactory performance. This study is of significance for understanding the WS transformation during TCC, especially when the molten salt is involved. The effective suppression of gas emissions under controlled conditions and the stable performance during continuous operation demonstrate the potential of this process for large-scale applications in the future.
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2016
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IF 3.349
Hongyan Xia,Ke Wang,Shaohui Yang,Zhongqi Shi,Hongjie Wang,Jiping Wang
Graphene flowers on porous activated carbon was successfully obtained by activation of mesocarbon microbeads (MCMB) with KOH at high temperature. By investigation of structure evolution with temperature from 800 to 1100 °C, it was found the coarse surface of activated carbon with cracks and small particles became to be graphene flowers when the activation temperature reached 1000 °C. The activated carbon with graphene flowers had high specific surface area value (1855 m 2 /g) and pore volume (1.18 cm 3 /g), which was ascribed to the chemical reactions, K intercalation and existence of graphene flowers. From the microstructural analysis , it was deduced that graphene flowers on the activated carbon was obtained from the high ordered layers in the small building units of MCMB, which processed the removal of disordered carbon , remaining the high ordered layers left under high temperature activation.
研究领域:
材料科学
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碳材料
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纳米技术
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2024
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IF 5.6
Wenbin Zhang,Xiangsheng Han,Zhiqiang Qi,Hao Tan,Keyan Yang,Hongzhen Cai
Lignin-containing cellulose nanofibers (LCNFs) with promising sustainability and multiple functionalities are highly in demand while still limited by the high energy consumption and potential environment disruption in preparation. In this work, the super-base system (dimethyl sulfoxide/potassium hydroxide, DMSO/KOH) was firstly employed as pseudosolvent to swell melon vine powder by partially remove some non-cellulose components (such as extraction, lignin and ash) in plant cell wall, and facilitate the following production of LCNFs. Due to the strong nucleophilicity of DMSO/KOH, universal swollen effects toward corn husk , poplar, bagasse , rice husk, and cotton stalk were achieved, and the LCNFs from them were also successfully obtained (with yields of ∼78.75%, 55.60%, 51.33%, 46.13%, and 53.90%, respectively). Besides, this method resulted in high lignin content among LCNFs (∼19.54%), which endowed the resultant membranes with superior mechanical strength, thermal stability, and dye rejection performance (a rejection rate of ∼92.7%, and a flux of 15.16 L•m -2 •h -1 •bar -1 toward methyl violet at 250 ppm). Thus, this research paves a simple, efficient, and universal way to prepare LCNFs from various biomass.
研究领域:
材料科学
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环境科学
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生物质工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
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IF 4.784
Min Luo,Xin Wang,Taotao Meng,Pei Yang,Ziqi Zhu,Huihua Min,Minzhi Chen,Weimin Chen,Xiaoyan Zhou
Herein, chitosan-based hydrogel beads (CHBs) were used to prepare N- and O-enriched hierarchical porous carbon (PC) by microwave heating for only 10 min. Water molecules in CHBs can act as heating carriers, and the resulting steam not only squeeze out air to create an oxygen-free atmosphere but act as physical activating agent to generate pores. Furthermore, the increased temperature contributed to form chitosan-based char, which, in turn, facilitated microwave absorption to further increase temperature. Considering that KOH as gelling agent of CHBs can also generate pores, the effect of KOH concentration on physicochemical properties of PCs was investigated in detail. Significantly, appropriately higher KOH concentration (3–7%) would cause fiercer reactions to achieve more developed porous structure, while excessive KOH concentration (10%) led to over-etching phenomenon and limited the further development on porous structure. The obtained PCs exhibited large specific surface area up to 1743 m 2 g −1 and O, N-enriched structure (O: 25.1%, N: 4.9%). Particularly, the optimized PC-based electrode prepared by using 7% KOH solution showed remarkably high rate capability (89%). This work provides a one-step and cost-effective method to prepare a promising electrode material for high-rate supercapacitors.
研究领域:
材料科学
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能源存储
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产品关联
DOI
PubMed
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2022
·Vol. 18
·期 2
·e2871
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IF 1.777
Biao Jin,Shanshan Liu,Dongri Jin
The design of electrode materials for sensitive electrochemical sensors is important for the rapid detection of ascorbic acid. Using Physalis alkekengi L. husks (PaLH) as the carbon precursor, PaLH-derived carbon materials (PCM) were prepared by high temperature carbonization, and hierarchical porous carbon materials (KPCM) were prepared by KOH activation. The carbon materials were characterized by scanning electron microscopy, X-ray diffraction, and isothermal nitrogen adsorption and desorption. KPCM had a larger specific surface area (1345.45 m 2 g −1 ) and more micro/mesopores than PCM without KOH activation. Two types of carbon materials, PCM and KPCM, were used as electrode modifiers, and the electrochemical properties of KPCM/GCE and PCM/GCE (GCE = glassy carbon electrode) were investigated. KPCM/GCE had a higher electron-transfer rate, higher electrochemically active area, smaller charge-transfer resistance, wider potential window, and higher catalytic activity for ascorbic acid detection. An ascorbic acid electrochemical sensing platform constructed with KPCM/GCE showed high sensitivity (334.03 μA mM −1 cm −2 and 134.52 μA mM −1 cm −2 ) and a low detection limit (0.92 μM) ( S/N = 3) in the linear range of 0.005–1.6 mM. This method was applied to the analysis and determination of ascorbic acid in chewable vitamin C tablets.
研究领域:
分析化学
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材料科学
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电化学
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
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2024
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IF 1.3
Jianhai Wang,Fanen Zeng,Lu Lu,Hongfeng Xu,Bing Xu
Hierarchical porous carbon materials were synthesized from bamboo shoot shells via KOH activation. The physicochemical properties of bamboo shoot shell–based hierarchical porous carbon (BBCK) were investigated by scanning electron microscopy, X–ray diffraction, Raman spectroscopy, X–ray photoelectron spectroscopy, and N 2 adsorption–desorption analyses. Results confirmed that the ratio of KOH to BBCK significantly affected the pore structure, O content and electrochemical properties of BBCK. The obtained BBCK exhibited a specific surface area of 1394 m 2 g –1 and a pore volume of 0.58 cm 3 g –1 . The O content of BBCK was 25.09%. The formation mechanism of BBCK, which had a hierarchical porous structure via KOH activation, was illustrated systematically. The specific capacitance was 320.05 F g –1 at 0.5 A g –1 in the 6 M KOH electrolyte, and multiplicity performance was 75.22% at 10 A g –1 . The assembled symmetric supercapacitors demonstrate the power density was 250 W kg –1 , and the energy density was 7.36 Wh kg –1 . After 7000 cycles, the capacitance retention rate at 100%.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
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2017
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IF 4.218
Guo-Wei Yu,Jing Nie,Lin-Guang Lu,Shen-Peng Wang,Zu-Guang Li,Maw-Rong Lee
Microwave and ultrasound have been demonstrated to be outstanding process intensification techniques for transesterification of oil. According to their mechanisms, simultaneous effects can surely bring about better enhancement than sole microwave or ultrasound. Therefore, this study aimed to investigate the important factors and their suitable levels in the KOH-catalyzed transesterification of soybean oil with methanol by using synergistic assistance of microwave-ultrasound (CAMU). The feasibility of application of CAMU in transesterification of oil was demonstrated. When the dosage of methanol, soybean oil and KOH were 15.4 g, 34.7 g (with methanol-to-oil molar ratio of 12:1) and 1 g, respectively, and the microwave power, ultrasonic power, ultrasonic mode, reaction temperature and reaction time were 700 W, 800 W, 1:0, 65 °C and 6 min, respectively, the transesterification reached 98.0% of yield, being the highest yield among all the results obtained; while by using 600 W of microwave plus stirring instead of CAMU, only 57.4% of yield could be obtained. Compared with other reaction techniques, the transesterification by applying novel CAMU was found to have remarkable advantages. Furthermore, by monitoring the variation of real-time temperature and microwave power during transesterification reactions with different microwave operation time and by taking comparison of the corresponding yield, it was demonstrated that the main reason for the acceleration of microwave-assisted transesterification was the polarization and further activation of reactants caused by microwave irradiation, but not the factor of fast heating.
研究领域:
生物化学工程
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可再生能源
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产品关联
DOI
PubMed
高影响因子
Journal of CO2 Utilization
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2022
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IF 8.321
Ren Wu,Agula Bao
With the development of large-scale animal husbandry, large amounts of manure have brought great harm to the ecological environment, thus limiting sustainable development of human and animal husbandry. Biomass carbon has been extensively studied as an adsorption material. The rational use of cow dung as biomass has important research significance for the ecological environment. However, most previous work has directly converted biomass to carbon, which limits its application due to the poor quality stability of the biomass porous carbon and large variations in performance resulting from the complexity of biomass composition and microstructure. In this work, porous carbons were prepared after pretreatment of cow dung with NaOH-urea solution to extract cellulose and activate KOH. The results showed that the materials prepared under the optimal conditions (pre-carbonization temperature of 600 °C, cellulose-to-KOH ratio of 1:1) exhibited an ultrahigh specific surface area (1345 m 2 /g) and micropore ratio (74.24%). The capacities for adsorption of CO 2 at 273 K and 298 K and 1 bar were as high as 4.61 mmol/g and 3.26 mmol/g, respectively. This study expands the application range for cellulose and has significance for future preparation of porous carbon materials by extracting cellulose from biomass.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）