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.

Effect of ZnO-Loading Method on Adsorption and Decomposition Capacities of Expanded Graphite/ZnO Composites for Crude Oil

2011 ◽  
Vol 284-286 ◽  
pp. 173-176 ◽  
Author(s):  
Xue Qing Yue
Keyword(s):  
Weight Loss ◽  
Crude Oil ◽  
Adsorption Capacity ◽  
Uv Irradiation ◽  
Zinc Acetate ◽  
Expanded Graphite ◽  
Expandable Graphite ◽  
Loading Method ◽  
Weight Loss Method ◽  
Loss 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 adsorption capacity of the composites for spilled crude oil was measured, and under UV irradiation, the decomposition of the absorbed crude oil was investigated by oil weight loss method. The results show that the composites have adsorption and photocatalysis capacity for crude oil at the same time, and the adsorption and photocatalysis capacity are influenced by ZnO-loading method.

Removal of Methyl Orange from Aqueous Solution by Using Exfoliated Graphite/ZnO Composites

2011 ◽  
Vol 284-286 ◽  
pp. 169-172
Author(s):  
Xue Qing Yue
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Removal Efficiency ◽  
Uv Irradiation ◽  
Zinc Acetate ◽  
Exfoliated Graphite ◽  
Adsorption Efficiency ◽  
Operation Parameters ◽  
Decomposition Efficiency ◽  
Selection Of

Exfoliated graphite/ZnO composites (EG/ZnO) were prepared by heating a mixture of EG and zinc acetate, and under UV irradiation, used for removing methyl orange (MO) from aqueous solution. The composites synchronously have the adsorption efficiency of EG and decomposition efficiency of ZnO. The removal efficiency is influenced by the ZnO content, initial MO concentration and pH of solution. After selection of desired operation parameters, the complete MO removal can be achieved after 3 h UV irradiation.

Removal of Methyl Orange from Aqueous Solution onto Expanded Graphite by Adsorption Process

2011 ◽  
Vol 322 ◽  
pp. 89-92
Author(s):  
Min Cong Zhu ◽  
Tong Yang ◽  
Jin Bo Huang ◽  
Ying Chen Zhang ◽  
Deng Xin Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Adsorption Process ◽  
Expanded Graphite ◽  
Microwave Oven ◽  
Expandable Graphite ◽  
Ph Values ◽  
Domestic Microwave Oven ◽  
Irradiation Treatment ◽  
Monolayer Adsorption

The expanded graphite (EG) was prepared after microwave irradiation treatment of the expandable graphite in a domestic microwave oven at 1000 W for 60 s. The adsorption of methyl orange (MO) from aqueous solution onto EG was investigated at initial concentrations and contact time, different pH values, adsorbent dosage, temperatures for the removal of dye. The results confirmed that the adsorption isotherm data fitted to Langmuir isotherm with monolayer adsorption capacity of 13.37 mg/g. The results suggested that the EG would be an excellent adsorbent for the removal of MO by adsorption process.

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.

Adsorption of Organic Compounds on Refined Latvian Clay

2018 ◽  
Vol 788 ◽  
pp. 83-88
Author(s):  
Oskars Leščinskis ◽  
Ruta Švinka ◽  
Visvaldis Švinka
Keyword(s):  
Methyl Orange ◽  
Zeta Potential ◽  
Adsorption Capacity ◽  
Clay Minerals ◽  
Organic Compounds ◽  
Clay Mineral ◽  
Rhodamine B ◽  
Ph Value ◽  
Ftir Spectra ◽  
Ph Values

Clays are materials consisting of clay minerals and non-clay minerals. Clay mineral fraction is considered to be a nanofraction. Clay minerals can be used for water purification and treatment. Description and characterization of 3 different Latvian clay nanosized minerals from 3 different geological periods (clay Liepa from Devonian period, clay Vadakste from Triassic period and clay Apriki from Quaternary period) as well as their adsorption capacity concerning organic compounds such as methyl orange and rhodamine B are summarized. Nanosized clay mineral particles were obtained using sedimentation method. Particle size distribution, zeta potential and FTIR spectra is given. The adsorption tests of above mentioned organic compounds were carried out in water solutions at 3 different pH values. The adsorption values were determined by means of UV-spectrophotometric technique. Zeta potential values for clay minerals Apriki, Liepa and Vadakste are -40.9 mV, -49.6 mV and -43.0 mV, respectively. FTIR spectra show similar tendencies for all 3 clay minerals. The best adsorption capacity concerning methyl orange and rhodamine B were in solutions with a pH value of 2, whereas at neutral and alkaline pH values adsorption in 24 hours was not observed.

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.

scholarly journals Adsorción del naranja de metilo en solución acuosa sobre hidróxidos dobles laminares

2015 ◽  
Vol 25 (3) ◽  
pp. 25-34 ◽  
Author(s):  
Laura Alicia Ramírez Llamas ◽  
Araceli Jacobo Azuara ◽  
J. Merced Martínez Rosales
Keyword(s):  
Methyl Orange ◽  
Adsorption Capacity ◽  
Dye Adsorption ◽  
Temperature Programmed Desorption ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Suitable Temperature ◽  
Temperature Programmed ◽  
Double Hydroxides

In this paper, layered double hydroxides (LDH) were synthesized and characterized using techniques of Physisorption of Nitrogen, Infrared, Temperature Programmed Desorption, X-Ray Diffraction, TGA and Immersion Microcalorimetry, in order to determine the basic properties of the adsorbent. The methyl orange (MO) is used as a dye and as a result, it is frequently found in effluents from textile industries. The dye adsorption isotherms on LDH were studied as function of pH and temperature. The maximum adsorption capacity of methyl orange on LDH was carried out at pH 5, and the minimum adsorption capacity at pH 11, being 40.2 mg/g and 22.1 mg/g, respectively. Furthermore, the suitable temperature to promote the adsorption of methyl orange on LDH was at 25 °C, as at 35 °C shows a significant decrease. 

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.

scholarly journals The growth mechanism of titania/hydroxyapatite and its application in the photodegradation of methyl orange dye under UV irradiation

2018 ◽  
Vol 11 ◽  
pp. 112-117 ◽  
Author(s):  
Wei Liu ◽  
Gongming Qian ◽  
Lulu Liu ◽  
Xianyuan Fan ◽  
Xianyan Cai ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Uv Irradiation ◽  
Growth Mechanism ◽  
Methyl Orange Dye
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