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Study on the Synthesis and Electrochemical Properties of Nitrogen-Doped Graphene Quantum Dots.
Materials (Basel)
December 2024
Shandong Jinhong New Material Co. Ltd., Weifang 262100, China.
Nitrogen-doped graphene quantum dots (N-GQDs) are widely used in biosensing, catalysis, and energy storage due to their excellent conductivity, high specific surface area, unique quantum size effects, and optical properties. In this paper, we successfully synthesized N-GQDs using a facile hydrothermal approach and investigated the effects of different hydrothermal temperatures and times on the morphology and structure of N-GQDs. The results indicated that the size of N-GQDs gradually increased and they eventually aggregated into graphene fragments with increasing temperature or reaction time.
View Article and Find Full Text PDFExtremely efficient catalytic ozonation of ammonia N to N using Co/Mg(OH) as catalysts.
J Hazard Mater
December 2024
Engineering Research Center of Low-Carbon Treatment and Green Development of Polluted Water in Northeast China, Ministry of Education, Northeast Normal University, Changchun 130117, China; Jilin Engineering Lab for Water Pollution Control and Resources Recovery, Northeast Normal University, Changchun 130117, China; School of Environment, Northeast Normal University, Changchun 130117, China.
The development of highly efficient and selective ozonation catalysts is crucial for enhancing the treatment of nitrogen-containing wastewater. In this study, a Co/Mg(OH) nano-hexagonal sheets ozonation catalyst was prepared by one-pot hydrothermal method, and the structural characteristics of this catalyst were comprehensively analyzed. The O/O ratio of this catalyst was 41.
View Article and Find Full Text PDFNovel nitrogen-doped carbon-coated SnSe based on a post-synthetically modified MOF as a high-performance anode material for LIBs and SIBs.
Nanoscale
August 2024
Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW, 2007, Australia.
SnSe with high theoretical capacity has been identified as an emerging anode candidate for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). However, the rate performance and cycling performance of this material in practical applications are still limited by unavoidable volume expansion and low conductivity. In this work, we designed and synthesized nitrogen-doped carbon-coated SnSe/C-N composites using 2-aminoterephthalic acid (CHNO) as a nitrogen-containing compound for modification by hydrothermal and vacuum calcination methods to achieve efficient utilization of active sites and optimization of the electronic structure.
View Article and Find Full Text PDFUnveiling drastic influence of cross-interactions in hydrothermal carbonization of spirulina with cellulose, lignin or poplar on nature of hydrochar and activated carbon.
J Environ Manage
August 2024
School of Materials Science and Engineering, University of Jinan, Jinan, 250022, PR China. Electronic address:
Spirulina platensis contains abundant nitrogen-containing organics, which might react with derivatives of cellulose/lignin during hydrothermal carbonization (HTC), probably affecting yield, property of hydrochar, and pore development in activation of hydrochar. This was investigated herein by conducting co-HTC of spirulina platensis with cellulose, lignin, and sawdust at 260 °C and subsequent activation of the resulting hydrochars with KCO at 800 °C. The results showed that cross-condensation of spirulina platensis-derived proteins with cellulose/lignin-derived ketones and phenolics did take place in the co-HTC, forming more π-conjugated heavier organics, retaining more nitrogen species in hydrochar, reducing yields of hydrochar, making the hydrochar more aromatic and increasing the thermal stability and resistivity towards activation.
View Article and Find Full Text PDFHydrothermal liquefaction of composite household waste to biocrude: the effect of liquefaction solvents on product yield and quality.
Environ Sci Pollut Res Int
June 2024
Department of Chemical Engineering, Mohamed Sathak Engineering College, Sathak Nagar, SH 49, Keelakarai, Tamil Nadu, 623806, India.
The hydrothermal liquefaction (HTL) of composite household waste (CHW) was investigated at different temperatures in the range of 240-360 °C, residence times in the range of 30-90 min, and co-solvent ratios of 2-8 ml/g, by utilising ethanol, glycerol, and produced aqueous phase as liquefaction solvents. Maximum biocrude yield of 46.19% was obtained at 340 °C and 75 min, with aqueous phase recirculation ratio (RR) of 5 ml/g.
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