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Your search keyword '"Qiu, Xueqing"' showing total 31 results
Start Over Author "Qiu, Xueqing" Journal industrial & engineering chemistry research
31 results on '"Qiu, Xueqing"'

3. Lignosulfonate-Assisted Synthesis of Porous Carbon-Supported MnO2Composites with Reinforced Interface Bonding for High-Performance Asymmetric Supercapacitors

Author

Fu, Fangbao, Qiu, Xueqing, and Yang, Dongjie

Abstract

Carbon/transition metal oxide composites exhibit promising potential as electrode materials for energy storage, but regulating their interfacial composite structures remains a formidable challenge. In this work, we develop a lignosulfonate-assisted synthesis strategy to fabricate a porous carbon-supported MnO2composite (LSC/MnO2-2) with a robust interface for asymmetric supercapacitors (ASCs). The functionalized lignin porous carbon, achieved through p–p interactions with lignosulfonate, exhibited improved dispersibility, thereby facilitating the deposition of MnO2onto the carbon matrix. Consequently, LSC/MnO2-2 demonstrates uniform MnO2loading and enhanced interfacial bonding. The robust interaction between Mn sites and the lignosulfonate-functionalized carbon substrate can promote electron transfer and ion transfer kinetics, effectively activating the electrochemical activity of MnO2. The as-prepared LSC/MnO2-2 demonstrates high specific capacitances of 750 F/g at 0.5 A/g and 400 F/g at 10.0 A/g in a 1 M KOH electrolyte. Furthermore, the assembled ASC exhibits an outstanding energy density of 54.4 Wh/kg at 998.2 W/kg and excellent cyclic stability (94.7% retention over 10,000 cycles at 2.0 A/g). This study presents an alternative method to precisely control the deposition of metal oxides onto carbon materials, aiming to enhance the performance of carbon composites.

Published
2024
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15. Regulating the Porous Structure of Lignin-Derived Carbon Materials for High Adsorption Performance via Dual Nitrogen Source-Assisted Activation

Author

Fu, Fangbao, Bai, Dongcheng, Cai, Zhihong, Lin, Xuliang, and Qiu, Xueqing

Abstract

Carbon adsorbents are ideal materials for the treatment of organic pollutants in water, but there still exist challenges in regulating the pore structure and optimizing the adsorption properties. This work presents the preparation and application of lignin-derived carbon materials (ALUNC-0.5) with high specific surface area, multiscale pores, and abundant nitrogen doping sites achieved through coactivation using melamine, urea, and potassium carbonate. And the carbon source used is the biorefinery residue lignin. The incorporation of urea facilitated the uniform mixing of raw materials and enhanced the microporosity of the resulting carbon materials. In simulated wastewater treatment scenarios, ALUNC-0.5 demonstrated impressive actual adsorption capacities of up to 1276 and 1414 mg g–1for methylene blue (MB) and tetracycline hydrochloride (TCH), respectively, while maintaining excellent reproducibility. This exceptional efficacy in pollutant removal can be attributed to the presence of multiscale pores and nitrogen doping sites, which effectively facilitate mass transfer and enhance pollutant adsorption through multiple mechanisms. The study presents a green and efficient activation method for the preparation of lignin carbon materials with outstanding adsorption performance, offering valuable insights into sustainable approaches for mitigating water pollution.

Published
2024
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24. Bioconversion of Beetle-Killed Lodgepole Pine Using SPORL: Process Scale-up Design, Lignin Coproduct, and High Solids Fermentation without Detoxification

Author

Zhou, Haifeng, primary, Zhu, J. Y., additional, Luo, Xiaolin, additional, Leu, Shao-Yuan, additional, Wu, Xiaolei, additional, Gleisner, Roland, additional, Dien, Bruce S., additional, Hector, Ronald E., additional, Yang, Dongjie, additional, Qiu, Xueqing, additional, Horn, Eric, additional, and Negron, Jose, additional

Published
2013
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