Ultrafast preparation of saccharide-derived carbon microspheres with excellent dispersibility via ammonium persulfate-assisted hydrothermal carbonization

2019 ◽  
Vol 7 (32) ◽  
pp. 18840-18845 ◽  
Author(s):  
Pei Liu ◽  
Weiquan Cai ◽  
Jiahao Wei ◽  
Zhijun Cai ◽  
Mengyuan Zhu ◽  
...  
Keyword(s):  
Sunflower Seed ◽  
Hydrothermal Carbonization ◽  
Ammonium Persulfate ◽  
Carbon Microspheres ◽  
Sunflower Seed Shells

An ammonium persulfate-assisted hydrothermal strategy was successfully used to prepare carbon microspheres with excellent dispersibility from sucrose rapidly. The method can also be extended to glucose, starch and sunflower seed shells.

Effect of L-Arginine on the Carbon Microsphere Forming under Hydrothermal Carbonization

2019 ◽  
Vol 41 (1) ◽  
pp. 72-72
Author(s):  
Jilei Liang Jilei Liang ◽  
Mengmeng Wu Mengmeng Wu ◽  
Hongmei Cai Hongmei Cai ◽  
Hao Wang Hao Wang ◽  
Hua Huang Hua Huang ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Adsorption Capacity ◽  
Surface Property ◽  
Condensation Reaction ◽  
Hydrothermal Carbonization ◽  
Carbon Microspheres ◽  
N2 Adsorption ◽  
Sem Images ◽  
Ft Ir ◽  
Adsorption Desorption

Carbon microspheres (CMs) with a diameter of 5-10 μm have been synthesized by hydrothermal carbonization of starch and L-arginine. The surface property and structure of CMs were examined by FT-IR spectra, N2 adsorption-desorption isotherms and SEM images. These characterizations indicated that the L-arginine does not connect into the CMs but it promotes the starch hydrolysis and polymerization-condensation reaction of intermediate, which accelerates the formation of CMs and improves the yield in shorter time. The surface property of CMs determines adsorption capacity for acetic acid. By contrast, the porosity resulted from the carbonization at 500 and#176;C dominates the adsorption capacity for acetic acid.

Preparation and Characterization of Carbon Microspheres From Waste Cotton Textiles By Hydrothermal Carbonization

2019 ◽  
Vol 7 (12) ◽  
pp. 1309-1319
Author(s):  
Yongfang Zhang ◽  
Wensheng Hou ◽  
Hong Guo ◽  
Sheng Shi ◽  
Jinming Dai
Keyword(s):  
Hydrothermal Carbonization ◽  
Carbon Microspheres ◽  
Cotton Textiles

Hydrothermal Solid Carrot Spheres

2018 ◽  
Vol 283 ◽  
pp. 16-22
Author(s):  
Bralee Chayasombat ◽  
Visittapong Yordsri ◽  
Vittaya Amornkitbamrung ◽  
Seksan Lowpa ◽  
Samuk Pimanpang ◽  
...  
Keyword(s):  
Hard Sphere ◽  
Hydrothermal Carbonization ◽  
Solid Carbon ◽  
Carrot Juice ◽  
Carbon Microspheres ◽  
X Ray Diffraction ◽  
X Ray ◽  
Graphitic Structure ◽  
Sphere Formation ◽  
Solid Spheres

In this study, hydrothermal carbonization of carrot juice was conducted at 180 °C for 6 hours, followed by annealing at 500 °C for 6 hours. In the absence of a catalyst, hydrothermal carbonization of carrot juice produced hollow and solid carbon microspheres (CMS) with diameters ranging from 0.3 to 4.0 µm. SEM and TEM images of the CMS showed various morphologies and sizes. X-ray diffraction and Raman spectroscopy indicated the CMS had a disordered graphitic structure. A HAADF micrograph showed that although the majority of the CMS in this study were hollow, there were also solid spheres which had not previously been reported for hydrothermal carbonization. STEM EDS mapping of a solid CMS indicated approximately 95 wt% of C with traces of N, O, Si, P, S, Cl and K. The effect of the starting precursors on the hard sphere formation mechanism is discussed.

scholarly journals Pyrolytic biochars from sunflower seed shells, peanut shells and Spirulina algae: their potential as soil amendment and natural growth regulators

2020 ◽  
Vol 2 (11) ◽  
Author(s):  
Mariana P. Silva ◽  
María L. Nieva Lobos ◽  
Roxana V. Piloni ◽  
Diego Dusso ◽  
María E. González Quijón ◽  
...  
Keyword(s):  
Growth Regulators ◽  
Soil Amendment ◽  
Sunflower Seed ◽  
Natural Growth ◽  
Peanut Shells ◽  
Sunflower Seed Shells

Effects of additives on sucrose-derived activated carbon microspheres synthesized by hydrothermal carbonization

2017 ◽  
Vol 52 (18) ◽  
pp. 10787-10799 ◽  
Author(s):  
Haiyang Zhao ◽  
Xiaoai Lu ◽  
Yue Wang ◽  
Bin Sun ◽  
Xianghao Wu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Hydrothermal Carbonization ◽  
Carbon Microspheres

Characteristics of Hydrochars Derived from Glucose, Protein, and Cellulose by Hydrothermal Carbonization Treatment

2021 ◽  
Vol 15 (1) ◽  
pp. 97-104
Author(s):  
Peiru Zhu ◽  
Jiayang Liu ◽  
Jun Ma ◽  
Lian Li ◽  
Xueying Zhang
Keyword(s):  
Residence Time ◽  
Raw Materials ◽  
Calorific Value ◽  
Hydrothermal Carbonization ◽  
Carbon Microspheres ◽  
Wet Biomass ◽  
Bio Oil ◽  
Higher Temperature ◽  
Absolute Advantage

With hydrothermal carbonization (HTC) treatment, wet biomass can be rapidly converted into hydrochar product with high-carbon content and calorific value. The current study employed glucose, protein, and cellulose as raw materials to investigate the effects of reaction temperature and residence time on characteristics of hydrochars. Results showed that the optimal reaction temperatures for glucose, protein, and cellulose were 240 °C, 190 °C and 220 °C, respectively. The optimal residence times were 4 h, 3 h and 4 h respectively, under which carbon microspheres with smooth surface and uniform particle size tended to form. The increased temperature promoted decomposition of bio-oil in the hydrothermal system and improved the quality of carbon microspheres, but much higher temperature deformed the surface of the carbon microspheres. Appropriate residence time ensured full growth of carbon microspheres but excessive residence time made the formed carbon microspheres to crosslink with each other, causing roughness to the surface. In addition, comparison of the specific surface area showed that the cellulose carbon microspheres exhibited an absolute advantage.

scholarly journals A New and Environmentally Friendly Route for Preparation of Carbon Microspheres from Wheat Straw

2013 ◽  
Vol 2013 ◽  
pp. 1-3 ◽  
Author(s):  
Chen Leishan ◽  
Wang Cunjing ◽  
Miao Yu ◽  
Chen Gairong
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Wheat Straw ◽  
Carbon Materials ◽  
Hydrothermal Carbonization ◽  
Raw Material ◽  
Carbon Microspheres ◽  
Liquid Ratio ◽  
Solid Liquid ◽  
Scanning Electron

The reactions were performed to synthesize carbon materials using wheat straw powder as raw material. The wheat straw powder was first hydrolyzed at the absence of a catalyst at 190°C for 1 h, then the hydrolyzate solution was used as carbon source to prepare carbon materials via hydrothermal carbonization at 180°C in the absence of a catalyst for 8 h. The influence of solid-liquid-ratio of wheat straw to water on the morphology of the product was investigated. The samples were examined by a scanning electron microscope and Fourier transform infrared spectroscopy. The results show that the product was carbon microspheres with a large number of O–H, CHO, and other functional groups, and the diameters of carbon microspheres noticeably depended on the solid-liquid ratio. When the solid-liquid ratio was 1 : 60, the diameters of carbon microspheres were in the range of 100 to 300 nm when the solid-liquid ratio was 1 : 40, carbon microspheres with larger and more uniform diameters mostly about 250 nm were obtained, and when the solid-liquid-ratio was 1 : 20, there were more larger carbon microspheres with diameters about 800 nm in the product and the surface of these carbon microspheres is smoother, whereas; the uniformity of the product deteriorates.

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