Effect of Particle Size of Natural Graphite on Methyl Blue Sorption Behavior of Expanded Graphite

2012 ◽  
Vol 499 ◽  
pp. 12-15 ◽  
Author(s):  
Li Ji ◽  
Meng Lu Wang
Keyword(s):  
Particle Size ◽  
Removal Rate ◽  
Expanded Graphite ◽  
Expansion Method ◽  
Treatment Method ◽  
Raw Material ◽  
Methyl Blue ◽  
Expandable Graphite ◽  
Sorption Behavior ◽  
Natural Graphite

Using three natural graphites with different particle sizes, 80, 50 and 35 mesh, as raw material, expanded graphite was prepared by rapidly heating expandable graphite in a muffle and by irradiating it in a microwave oven, respectively. The resulting expanded graphites were used for adsorbing methyl blue in water. The results show that the removal rate of methyl blue is influenced by the treatment method of solution, the particle size of natural graphite and expansion method of expandable graphite. After selection of desired operation parameters, a higher removal rate is achieved.

Effect of Preparation Technique on Methyl Orange Sorption Behavior of Exfoliated Graphite

2011 ◽  
Vol 284-286 ◽  
pp. 193-196
Author(s):  
Zhao Sheng Chen
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Removal Rate ◽  
Microwave Oven ◽  
Raw Material ◽  
Exfoliated Graphite ◽  
Expandable Graphite ◽  
Sorption Behavior ◽  
Preparation Technique ◽  
Natural Graphite

Three natural graphite flakes (35, 50 and 80 mesh) were used as raw material. Exfoliated graphite (EG) was prepared by rapidly heating expandable graphite to 1000 °C in a muffle and by irradiating it in a microwave oven with a power of 280 W for 40 s, respectively. The EG samples were used for removing methyl orange (MO) from aqueous solution. The effect of preparation technique of EG (particle size of natural graphite and exfoliation method of expandable graphite) on MO removal properties was investigated, and a higher removal rate was achieved.

Expansion Mechanism of Expandable Graphite Formed by Natural Graphite with Different Particle Size

2012 ◽  
Vol 499 ◽  
pp. 16-19
Author(s):  
Meng Lu Wang ◽  
Li Ji
Keyword(s):  
Particle Size ◽  
Expanded Graphite ◽  
Expansion Ratio ◽  
Microwave Oven ◽  
Raw Material ◽  
Expandable Graphite ◽  
Particle Sizes ◽  
Natural Graphite ◽  
Expansion Mechanism

Using three natural graphites with different particle sizes, 80, 50 and 35 mesh, as raw material, three expanded graphites were prepared by irradiating expandable graphite in a microwave oven. Results show that the particle size of natural graphite influences strongly the expansion ratio of expanded graphite, and the larger the particle size, the larger the expansion ratio. In addition, the expansion mechanism of expandable graphite is discussed.

Preparation of Expanded Graphite and Graphite Nanosheets for Improving Electrical Conductivity of Polyester Coating Films

2021 ◽  
Vol 21 (12) ◽  
pp. 5846-5858
Author(s):  
Yun Ding ◽  
Mingxia Tian ◽  
Aili Wang ◽  
Hengbo Yin
Keyword(s):  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Milling Time ◽  
Expanded Graphite ◽  
Graphite Powder ◽  
Expandable Graphite ◽  
Coating Films ◽  
Natural Graphite ◽  
Graphite Nanosheets ◽  
Volumetric Rate

Expanded graphite and graphite nanosheets were facilely prepared by the thermal expansion of expandable graphite at 800 °C and sand milling of expanded graphite in water, respectively. When the expandable graphite precursor was prepared by the oxidation and intercalation of natural graphite (5 g) using KMnO4 (6 g) as an oxidant in a concentrated sulfuric acid solution (120 mL) at room temperature (25 °C) for 8 h, the expanded graphite with a maximum volumetric rate of 317 mL g−1 was prepared after the thermal expansion of the expandable graphite precursor at 800 °C for 60 s. The oxidation extent of natural graphite with KMnO4 is crucial for the preparation of expanded graphite. The thicknesses of graphite nanosheets decreased from 8.9 to 3.2 nm when the sand milling time of the expanded graphite in deionized water was prolonged from 6 to 24 h. The prolonging of the sand milling time not only decreased the layer number of the graphite nanosheet but also increased the d002 spacing due to the shocking and shearing forces. The addition of the expanded graphite powder and graphite nanosheets in a polyester paint efficiently improved the electrical conductivity of the resultant polyester coating films.

Preparation of Expanded Graphite Using Recycling Graphite Rods by Microwave Irradiation

2012 ◽  
Vol 610-613 ◽  
pp. 2356-2360
Author(s):  
Hong Liang Hua ◽  
Yun Wang ◽  
Yu Jia Wang ◽  
Shi Jun Ruan ◽  
Chao Zeng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Potassium Dichromate ◽  
Expanded Graphite ◽  
Chemical Oxidation ◽  
Raw Material ◽  
Expandable Graphite ◽  
Graphite Rods ◽  
Scanning Electron

After washing, milling and calcining, the graphite rods recycled from waste dry batteries were used as raw material to prepare expandable graphite by chemical oxidation (using acetic anhydride as inserting and potassium dichromate as oxidant), the expanded graphite was prepared from the obtained expandable graphite by microwave radiation (MW) at 1000W for 60s.The characterization of infrared spectroscopy (IR) and scanning electron microscopy (SEM) of obtained expanded graphite have been discussed. The results show that it is feasible to prepare expanded graphite using graphite rods recycled from waste dry batteries.

Preparation of Exfoliated Graphite by Microwave Using Natural Graphite with Different Particle Sizes

2010 ◽  
Vol 163-167 ◽  
pp. 2333-2336 ◽  
Author(s):  
Kun Yu
Keyword(s):  
Particle Size ◽  
Microwave Irradiation ◽  
Small Particle ◽  
Graphite Particle ◽  
Microwave Oven ◽  
Raw Material ◽  
Exfoliated Graphite ◽  
Particle Sizes ◽  
Natural Graphite ◽  
Graphite Intercalation

Three natural graphite flakes (35, 50 and 80 mesh) were used as raw material. Exfoliated graphite (EG) was prepared by rapidly heating residue H2SO4-graphite intercalation compounds (RGIC) in a muffle and by irradiating it in a microwave oven, respectively. Results show that the exfoliation volume of EG decreases with decreasing the raw graphite particle size. Compared with muffle heating, microwave irradiation is more helpful for the exfoliation of RGICs, especially for the small particle samples.

Structural Evolution of Natural Flake Graphite during Intercalation and Exfoliation

2014 ◽  
Vol 552 ◽  
pp. 328-330
Author(s):  
Zhi Guo Liu
Keyword(s):  
Intercalation Compound ◽  
Structural Evolution ◽  
Expanded Graphite ◽  
Expandable Graphite ◽  
Flake Graphite ◽  
Graphite Intercalation Compound ◽  
X Ray Diffraction ◽  
Natural Graphite ◽  
X Ray ◽  
Graphite Intercalation

In order to investigate the structural evolution of natural flake graphite during intercalation and exfoliation, natural graphite flakes were treated by intercalating, water-washing, drying and expanding. The corresponding products, graphite intercalation compound (GIC), residue GIC (expandable graphite) and expanded graphite were characterized by X-ray diffraction (XRD). The results can provide reference for the research in this field.

Size Effect of Expandable Graphite

2012 ◽  
Vol 499 ◽  
pp. 72-75 ◽  
Author(s):  
Yan Lu
Keyword(s):  
Particle Size ◽  
Raman Spectroscopy ◽  
Raw Materials ◽  
Structural Disorder ◽  
Expandable Graphite ◽  
X Ray Diffraction ◽  
Natural Graphite ◽  
X Ray ◽  
Intercalating Agents ◽  
Scanning Electron

Using three natural graphites with different particle size, 35, 50 and 80 mesh, as raw materials, expandable graphites were prepared by intercalating, water-washing and drying the natural graphites. The products were characterized by X-ray diffraction, Infrared spectroscopy, scanning electron microscope and Raman spectroscopy. Results show that the structure of expandable graphite is affected strongly by the particle size of natural graphite. With increasing the particle size of natural graphite, for expandable graphite, the expansion degree of graphite flakes along the c-axis and the relative ratio of intercalating agents increase, while the structural disorder increases.

Effect of ZnO-Loading Method on Methyl Orange Removal Capacities of Expanded Graphite/ZnO Composites

2011 ◽  
Vol 284-286 ◽  
pp. 157-160
Author(s):  
Zhao Shen Chen
Keyword(s):  
Methyl Orange ◽  
Adsorption Capacity ◽  
Uv Irradiation ◽  
Zinc Acetate ◽  
Expanded Graphite ◽  
Methyl Blue ◽  
Expandable Graphite ◽  
Textural Characteristics ◽  
Loading Method

Three expanded graphite/ZnO composites, marked as EG/ZnO-1, EG/ZnO-2 and EG/ZnO-3, were prepared by heating a mixture of zinc acetate and water-washed expandable graphite, dried expandable graphite and EG, respectively. The products were used for removing methyl blue (MO) in water. Under UV irradiation, the composites have the adsorption capacity of EG and the photocatalysis capacity of ZnO at the same time. ZnO-loading method influences the textural characteristics and the MO removal capacities of EG/ZnO composites. Comparatively speaking, EG/ZnO-3 is the most effective for removing MO among these composites.

Treatment of Methyl Blue Wastewater by Steel Slag Particle Three-Dimensional Electrode System

2020 ◽  
Vol 12 (3) ◽  
pp. 344-349 ◽  
Author(s):  
Xiaolei Teng ◽  
Junfeng Li ◽  
Zhaoyang Wang ◽  
Weiwei Liu ◽  
Dongbao Song ◽  
...  
Keyword(s):  
Electrolyte Concentration ◽  
Removal Rate ◽  
Steel Slag ◽  
Three Dimensional ◽  
Electrode System ◽  
Raw Material ◽  
Methyl Blue ◽  
Particle Volume ◽  
Experimental Conditions ◽  
Factors Affecting

The particle electrode was prepared by using industrial waste slag as raw material, and the surface morphology of the particle electrode was characterized by scanning electron microscopy. The comparison experiments showed that under the same experimental conditions, the efficiency of removing the methyl blue from the three-dimensional electrode of the steel slag particles was 23.48% higher than that of the two-dimensional electrode, and the energy consumption was reduced by 36.2%. The results showed that the primary and secondary factors affecting the methyl blue wastewater of steel slag particles are electrolyte concentration, voltage, initial waste concentration and particle volume. Under the optimal combination of pH 3, voltage 12 V, initial methyl blue concentration of 15 mg/L and electrolyte concentration of 0.3 mol/L, the removal rate of methyl blue reached 91.41%.

Storage Problems of Poplar Chips from Short Rotation Plantations with Special Emphasis on Fungal Development

2012 ◽  
Vol 8 (1) ◽  
pp. 123-132 ◽  
Author(s):  
Zsuzsanna Horváth ◽  
Béla Marosvölgyi ◽  
Christine Idler ◽  
Ralf Pecenka ◽  
Hannes Lenz
Keyword(s):  
Particle Size ◽  
Health Risk ◽  
Dry Matter ◽  
Ph Value ◽  
Wood Chips ◽  
Raw Material ◽  
Special Focus ◽  
Fungal Development ◽  
Short Rotation ◽  
Fungal Particles

Abstract - There are several problems in storing wood chips freshly harvested from short rotation plantations, which result in quality losses as well as in dry matter and energy losses. The factors influencing the degradation of raw material are examined in this paper with special focus on fungal development. An excessive growth of fungi is connected to dry matter losses and also to an increased health risk during raw material handling. The following factors were measured during 6 months storage of poplar wood chips depending on particle size: box temperature, moisture content, pH-value, appearance of fungi in the storage and the concentration of fungal particles in the air. The results show a close connection between particle size, temperature and attack of fungi. During the storage mesophilic and termophilic species of the genera Alternaria, Aspergillus, Cladosporium, Mucor and Penicillium appeared. The concentration of fungal particles is the highest for fine chips and decreases in bigger particles. There was a special focus on the investigation of the properties of coarse chips (G 50), which represent a good compromise between handling, storage losses and health risk due to fungal development.

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