Materials
·
2025
·Vol. 18
·期 24
·5591
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IF 3.2
Wei Li,Yi Wu,Zengrui Gu,Chen Yang,Jiacheng Song,Jiaxuan Li,Yahao Zhang,Xuebin Lu,Jian Xiong
In this study, yak dung was used as a precursor to prepare biochar (KYBC600) via high-temperature pyrolysis and KOH modification for the adsorption of tetracycline hydrochloride (TCH) from aqueous solution. Compared with commonly used biomass feedstocks such as straw and fruit shells, the resource-oriented utilization of yak dung holds dual significance: it contributes to regional environmental management and enables high-value conversion of waste, underscoring its distinct regional relevance and potential for synergistic environmental governance. The physicochemical properties of KYBC600 were characterized using BET surface area analysis, FTIR, XRD, and SEM. Adsorption behavior and mechanisms were systematically investigated through kinetic, isotherm, and thermodynamic studies, supplemented by response surface methodology (RSM). The results demonstrated that the adsorption of TCH onto KYBC600 followed pseudo-second-order kinetics and the Langmuir model, with a maximum adsorption capacity of 54.10 mg·g −1 . Multiple synergistic mechanisms governed the adsorption process, including pore filling, π–π stacking, electrostatic interactions, hydrogen bonding, and complexation with Ca 2+ , with chemical adsorption playing a dominant role. KYBC600 demonstrated excellent adsorption performance and regeneration capability across a wide pH range and in various real water matrices. This study provides novel perspectives on the resource utilization of livestock waste in plateau regions and provides a technical reference for treating low-concentration TCH-containing wastewater.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Tao He,Xiaoben Zhao,Shuainan Wang,Song He,Ye Li
This research delves into the combined impact of employing sodium lignosulfonate as a feedstock, along with its inherent self-activating property and co-activation with KOH, in the preparation of activated carbon. Studies suggest that the natural activator, Na, aids in the internal creation of pores, thereby decreasing the reliance on KOH. The resulting activated carbon boasts a substantial specific surface area of 3362 m²/g, a significant micropore volume of 1.3435 cm³ /g, and considerable doping levels of nitrogen (1.09 %) and sulfur (2.46 %). Analysis of CO 2 adsorption indicates that the adsorption heat escalates with the quantity of CO 2 adsorbed, highlighting the pivotal role of micropores in this process. Monte Carlo simulations further demonstrate that narrowing the pore size range boosts CO 2 adsorption uptake. Nevertheless, as the temperature rises, the ability of micropores to capture carbon dioxide decreases, as shown by the increasing difference in adsorption capacity from 0 °C to 25 °C.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Shuangyu Wang,Zhiwei Hu,Zhongmou Pan,Dewei Wang
The construction of heteroatom-doped hierarchical carbon frameworks has attracted significant research attention as high-performance electrode materials for supercapacitors. Herein, a facile one-step Mohr’s salt-assisted KOH activation strategy has been developed for the production of S-doped hierarchical carbon frameworks with large specific surface area from sustainable spruce bark. We found Mohr’s salt plays multiple roles during the synthesizing process by simultaneously acting as an S source, the template to generate mesopores, and the co-activator beyond KOH. As the electrode for supercapacitors, the high specific capacitance of 281 and 156 F g −1 can be achieved in aqueous electrolyte and ionic liquid electrolyte at 1 A g −1 , respectively. More importantly, the electrode also displays excellent rate capability where a high capacitance can be maintained at large charge-discharge operation. Moreover, the supercapacitor device also demonstrated an energy density is high up to 66.26 Wh kg −1 at the power density of 875 W kg −1 in ionic liquid electrolyte. These results acquired could offer a versatile way to convert renewable biomass into value-add porous carbon for electrochemical energy-storage applications.
研究领域:
材料科学
·
能源存储
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高影响因子
NEW CARBON MATERIALS
·
2021
·
IF 1.905
Jing Wang,Shuang Chen,Jia-yu Xu,Li-cheng Liu,Ji-cheng Zhou,Jin-jun Cai
Hydrothermal treatment of biomass is effective in producing hydrochar, but the product usually has a low surface area and is not suitable for direct use as an adsorbent for CO 2 capture. We report the use of chitosan as a precursor for carbon prepared by a combination of hydrothermal treatment and mild KOH activation. The effect of an additive salt (eutectic salt of KCl/LiCl with a mass ratio of 5.5/4.5) in the hydrothermal treatment and activation temperature on the porosities and surface chemical states of the obtained carbons and their CO 2 capture were studied by N 2 adsorption, XPS, SEM and XRD. Results indicated that the porosities of the carbons were increased by increasing the activation temperature. The salt additive introduced mesopores in the hydrochar and slightly reduced the surface area of the porous carbon after activation, but was useful in increasing the number of N-species during hydrothermal treatment and activation. The carbons produced using the salt additive had much larger CO 2 uptakes under ambient conditions than those prepared without the salt, suggesting that porosity is not the only factor that determines the CO 2 uptake. The CO 2 uptake on the carbon activated by KOH at 600 °C produced from the salt-assisted hydrochar was the highest (as high as 4.41 mmol/g) although its surface area was only 1249 m 2 /g, indicating that CO 2 uptake was determined by both the microporosity and the active N-species in the carbon.
研究领域:
材料科学
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环境科学
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
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IF 8.5
Xiaodong He,Rui Ma,Puya Feng,Hairu Wang,Lili Ai,Mengjiao Xu,Dianzeng Jia,Luxiang Wang,Nannan Guo
The pursuit of high-energy-density carbon-derived supercapacitors continues to confront substantial material challenges, particularly regarding the rational design of electrode architectures. Herein, we systematically investigate biomass-derived porous carbons synthesized through a sustainable low-dosage KOH activation strategy, employing three distinct starch precursors: native corn starch, linear amylose, and amylopectin. Comprehensive characterization reveals critical structure-property relationships, where the amylose-derived carbon exhibits a highly disordered amorphous architecture with optimized hierarchical porosity, contrasting with the relatively ordered domains observed in corn starch and amylopectin derivatives. This structural superiority translates to exceptional electrochemical performance, demonstrating a remarkable gravimetric capacitance of 328 F g −1 at 1 A g −1 with outstanding rate capability (74 % retention at 50 A g −1 ) in 6 M KOH electrolyte. When configured as a symmetric supercapacitor, the material achieves an energy density of 8.1 Wh kg −1 at 250 W kg −1 while maintaining 98 % capacitance retention over 20,000 cycles - metrics that surpass most reported starch-derived carbons. This work establishes fundamental guidelines for tailoring biopolymer-derived carbons through precursor selection and activation control, offering new perspectives for sustainable energy storage solutions.
研究领域:
材料科学
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电化学
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能源存储
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纳米材料
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可持续材料
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Dan Yu,Yushuang Ma,Mingfeng Chen,Xiaoping Dong
Biomass precursors with natural porous structure and multifarious heteroatoms are desirably sustainable precursors for synthesis of carbon materials for energy and environmental applications. Herein, we reported wax gourd based porous carbons (WGPCs) with developed micro/mesoporous structures via potassium hydroxide (KOH) chemical activation . The optimized material that is denoted as WGPC-4 exhibits high specific surface area (2919 m 2 g −1 ) with oxygen and nitrogen contents of 17.9 at.% and 1.0 at.%, respectively. In a three-electrode system, the WGPC-4 electrode presents high specific capacitance of 333 F g −1 at current density of 1 A g −1 . Meanwhile, the assembled symmetrical cell using aqueous electrolyte (0.5 M Na 2 SO 4 ) has high specific capacitance (167 F g −1 at 1 A g −1 ), stable cycling characteristics (93% capacitance retaining after 5000 runs) and excellent energy density of 19.2 Wh kg −1 . Furthermore, these WGPC-4 electrodes were assembled into an all-solid-state supercapacitor using KOH/polyvinyl alcohol (PVA) gel as solid electrolyte , whose specific capacitance is 258 F g −1 at 1 A g −1 , retention at the 2500th run is 87% and energy density is 13.0 Wh kg −1 under a high power density. These materials with excellent structural characteristics are an ideal candidate for high-performance supercapacitors .
研究领域:
材料科学
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能源与环境科学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-18
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IF 2.8
Zhao Yutong,Mu Jincheng,Wang Yuanyuan,Liu Yanxiu,Wang Huan,Song Hua
Here we report an effective and facile method for preparing porous carbons (CSCK-T- x ) with highly developed hierarchical porosity for high-performance supercapacitor by one-step KOH activation of coconut shell carbon. The effects of carbonization temperature (T, °C) and KOH/C ratio ( x ) on the structure and electrochemical properties were studied systematically. As the KOH/C ratio and activation temperature increase, the S BET rapidly increases and then decreases and reaches a maximum (2143.6m 2 g −1 ) at 800 °C with a KOH/C ratio of 2. Furthermore, CSCK-800-2 displayed abundant micropores and two concentrated mesopores at 4 nm and 14 nm. In a three-electrode test system, CSCK-800-2 exhibits a high specific capacitance of 317 F g −1 at a current density of 0.5 A g −1 and considerable rate retention of 68% at 20 A g −1 . The symmetrical supercapacitor that was based on CSCK-800-2 showed a maximum energy density of 13.5 Wh kg −1 at 0.5 A g −1 with a superior cycling stability (99.7% of the capacitance retention after 10,000 cycles at 5 A g −1 ) in 6 M KOH electrolyte. The large specific surface area and unique hierarchical porosity of CSCK-800-2 enable it to have high ion-accessible surface and low-ion transport resistance. This one-step activation method provides an approach to convert biological waste into high-value hierarchical porous carbon material for electric double-layer capacitors.
研究领域:
材料科学
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能源存储
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高影响因子
Carbon Letters
·
2023
·Vol. 33
·期 4
·1205-1215
·
IF 4.5
Yang Mannan,Fang Changqing,Su Jian,Zeng Huilin,Lin Qilang
In this study, waste corrugated paper was used as carbon precursor with KOH-NaOH mixture (mole ratio was 51:49 and the melting point is 170 °C) as activator to prepare porous carbon at different reaction temperature and different mass ratio of KOH-NaOH mixture/waste corrugate paper fiber. The micro-morphology, pore structure information and composition of porous carbon were analyzed, and the formation mechanism of pores was investigated. The effect of activator amount and pyrolysis temperature on the morphology and structure of porous carbon were studied. The adsorption capacity of porous carbon was evaluated with the methylene blue as model pollutant. The effect of adsorbent amount, adsorption time and temperature on the adsorption performance of the porous carbon were analyzed. The maximum specific surface area is 1493.30 m 2 ·g −1 and the maximum adsorption capacity of methylene blue is 518 mg·g −1 . This study provides a new idea for efficient conversion and utilization of waste paper. Graphical abstract
研究领域:
材料科学
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环境科学
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高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Liting Ti,Xueru Sheng,Haiyuan Jia,Wenjia Han,Qingwei Ping,Jinfan Yang,Ning Li
Cyclopentanone self-condensation is an attractive reaction for the production of sustainable aviation fuel. However, the catalysts used for this reaction are usually complex or time-consuming to prepare. The reaction also needs to be carried out at a high temperature and over a long reaction time. In this paper, an integrated process for catalyst preparation and self-condensation via the ball-milling method was proposed. Compared with the thermocatalytic method, this process can be implemented with higher product yield (98.6% vs . 85.0%), lower energy demand (0.43 kWh· g −1 vs . 1.31 kWh· g −1 ), less preparation and reaction time (3 h vs . 32 h) at room temperature. According to characterizations, the excellent catalytic activity of catalysts prepared by the ball-milling method can be attributed to two reasons: (i) Smaller particles are formed during the ball-milling process, which is more conducive to catalyst and reactant contact during the reaction; (ii) Less moisture is absorbed by the catalyst, which has a positive effect on catalytic activity.
研究领域:
化学工程
·
催化科学
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Songlei Lv,Chunxi Li,Jianguo Mi,Hong Meng
In this study, the rice husk-based activated carbon was prepared via pyrolysis of rice husk and simultaneous KOH-activation and EDTA-4Na-modification and used for phenol adsorption from water. When the rice-husk was carbonized at 500 °C and activated at 750 °C with mass ratio of carbon to KOH of 1:3, an activated carbon can be prepared, with rich micro-porosity, high specific area of 2087 m 2 ·g −1 and maximum phenol adsorbance of 194.24 mg·g −1 . When the above activated carbon is prepared by simultaneous KOH-activation and EDTA-4Na-modification at 750 °C, N-containing functional groups were introduced to the activated carbon, which is beneficial to the adsorption of phenol . Under optimum conditions with mass ratio of carbon : KOH : EDTA-4Na = 1:3:1, the specific surface area of the resulting activated carbon decreases to 1368 m 2 ·g −1 , while its maximum adsorption capacity for phenol increases to 215.27 mg·g −1 . The adsorption kinetics of phenol on activated carbon agrees with the pseudo-second-order adsorption model, and the adsorption isotherm follows the Langmuir pattern.
研究领域:
环境科学
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材料科学
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高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Xiaofang You,Lixin Song,Jingwei Wang,Jianqiao Lv,Liqing Sun,Lin Li,Meng He
KOH activation was used to chemically activate coal gasification slag to prepare activated coke with high adsorption performance. Experimental investigation revealed that the optimal conditions for activating coke were achieved with an alkaline carbon mass ratio of 3.5:1, activation temperature of 850 °C, and duration of 45 min, resulting in superior adsorption performance for methyl orange (MO). Structural analysis unveiled that the activated coke (KAC-CRGS) exhibited a substantial abundance of micropores on its surface, complemented by the presence of mesopores , leading to a specific surface area of 422.16 m 2 /g, a total pore volume of 0.30 cm 3 /g, and a microporous volume of 0.0807 cm 3 /g. Adsorption experiments demonstrated that the adsorption behavior of MO by the activated coke adhered to the Langmuir isotherm adsorption equation, with a maximum unit adsorption capacity of 139.49 mg/g at 35 °C. The adsorption process was found to be spontaneous and exothermic, fitting a quasi-second-order kinetic model . After four cycles of repeated adsorption experiments, the adsorption capacity of KAC-CRGS for MO decreased from 120.68 mg/g to 103.62 mg/g. The adsorption mechanism study indicates that the adsorption of MO by KAC-CRGS primarily involves chemical adsorption mechanisms such as electrostatic attraction , van der Waals forces, hydrogen bonding , and π-π stacking, with physical adsorption mechanisms such as pore diffusion and pore filling serving as a secondary means.
研究领域:
环境科学
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材料科学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xin Liu,Yong-De Yan,Yun Xue,Yue-Lin Wang,Qing-Guo Zhang,Guan-Qing Hu,Fu-Qiu Ma,Jing-Ping Wang
Waste resins produced from nuclear facilities operation always contain organic sulfur and radioisotope 65 Zn, which pose a significant threat for the ecological environment. This study proposed comparative research for treating cation exchange resins doped with Zn 2+ (Zn-CERs) in Na 2 CO 3 -K 2 CO 3 and Na 2 CO 3 -K 2 CO 3 -KOH. The enhanced removal effect of sulfur and Zn 2+ by KOH addition was explored. The energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were carried out to investigate the element distribution and chemical states of C, O, S and Zn on Zn-CERs. The results of thermogravimetric analysis (TG) showed that the oxidation process of Zn-CERs was basically divided into three steps, and Zn 2+ acted as a catalyst for S-C destruction. The relatively mild reaction of Zn-CERs in Na 2 CO 3 -K 2 CO 3 -KOH largely avoids the escape of harmful gases (H 2 S and SO 2 ) caused by the overreaction. The participation of KOH could promote the sulfation of sulfides and sulfites, and the transformational SO 4 2− content reaches a maximum value (26.51 %) at 800 °C. When the temperatures above 700 °C, Zn 2+ and K + combines with SO 4 2− to form K 2 Zn 2 (SO 4 ) 3 . The proposed enhanced molten salt oxidation (MSO) system had excellent retention rates of Zn (99.56 %) and S (87.39 %) at 800 °C, which provides further technical references for the removal of organic sulfur and heavy metals.
研究领域:
环境科学
·
核化学与放射化学
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高影响因子
危险品化学品经营许可证（带存储）