scholarly journals Particle Size and Methylene Blue Absorption Characteristics of Cuttings Produced by Boring.

1994 ◽  
Vol 110 (10) ◽  
pp. 807-809
Author(s):  
HIDEKAZU SATO
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Absorption Characteristics

Effect of Sendust Particle Size on Absorption Characteristics of Composite Electromagnetic Wave Absorber

2009 ◽  
Vol 421-422 ◽  
pp. 451-454
Author(s):  
Kenji Sakai ◽  
Yoichi Wada ◽  
Yuuki Sato ◽  
Shinzo Yoshikado
Keyword(s):  
Particle Size ◽  
Electromagnetic Wave ◽  
Return Loss ◽  
Single Layer ◽  
Complex Permeability ◽  
Wave Power ◽  
Flexible Design ◽  
Frequency Range ◽  
Polystyrene Resin ◽  
Absorption Characteristics

The effects of the particle size of sendust, which is an alloy of Al 5%, Si 10%, and Fe 85%, on the absorption characteristics of composite electromagnetic wave absorbers made of polystyrene resin and sendust were investigated in the frequency range from 1 to 40 GHz. The size of sendust particles was varied between approximately 5 and 20 m. A metal-backed single-layer absorber made of 20 m sendust particles absorbed more than 99% of electromagnetic wave power at frequencies above 20 GHz. Meanwhile, a composite made of 5 m particles exhibited a return loss of less than −20 dB in the frequency range of not only several GHz but also above 30 GHz. In addition, the relative complex permeability r* was shown to be controlled by adjusting the particle size of sendust, and an electromagnetic wave absorber with a flexible design was proposed.

scholarly journals Adsorption of methylene blue from aqueous solutions by pyrolusite ore

2018 ◽  
Vol 18 (44) ◽  
pp. 5-11 ◽  
Author(s):  
Nizamettin Demirkıran ◽  
G D Turhan Özdemir ◽  
M Saraç ◽  
M Dardağan
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Contact Time ◽  
Average Particle Size ◽  
Dye Adsorption ◽  
Blue Dye ◽  
Average Particle ◽  
Order Kinetic ◽  
Adsorbent Dosage ◽  
Initial Ph

In this study, the adsorption of methylene blue dye was examined by using pyrolusite ore as a low-cost alternative adsorbent source. Pyrolusite, which contains mainly MnO2, is a manganese ore. The effects of the initial concentration of dye, contact time, initial pH of solution, adsorbent dosage, stirring speed of solution, and average particle size of adsorbent on the adsorption of methylene blue were studied. It was found that the percentage of the adsorbed dye increased with increasing the amount of pyrolusite. While the initial dye concentration, initial pH, contact time, stirring speed, particle size, and adsorbent dosage were 25 ppm, 6, 90 min, 250 rpm, 63 µm, and 12 g/l, respectively, the efficiency of dye adsorption on pyrolusite ore was 99%. The isotherm and kinetic studies relating to this adsorption process were also made. It was found that the equilibrium data followed the Langmuir isotherm model while the kinetic of process could be described by the pseudo-second order kinetic model.

scholarly journals Utilization of Composts for Adsorption of Methylene Blue from Aqueous Solutions: Kinetics and Equilibrium Studies

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2179
Author(s):  
Remigio Paradelo ◽  
Khaled Al-Zawahreh ◽  
María Teresa Barral
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Ionic Strength ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Environmental Remediation ◽  
Dye Removal ◽  
Low Cost ◽  
Pine Bark ◽  
Municipal Solid Waste Compost

Utilization of composts as low-cost adsorbents is an important application in the field of environmental remediation, but these materials have not yet been extensively used for dye removal. In this work, we have studied the characteristics of adsorption of methylene blue onto two composts (a municipal solid waste compost and a pine bark compost). Kinetics and equilibrium batch experiments testing the influence of adsorbent particle size, solution pH and ionic strength were performed. Both composts have a high adsorption capacity for methylene blue, similar to other low-cost adsorbents. Kinetics of adsorption followed a pseudo-first-order model, with maximum adsorption reached after a contact time of two hours. Equilibrium adsorption followed a Langmuir model in general. Reduction of particle size only increased adsorption slightly for composted pine bark. Increase in ionic strength had no effect on adsorption by municipal solid waste compost, but increased adsorption by composted pine bark. Modification of pH between 5 and 7 did not influence adsorption in any case. Overall, the results suggest that electrostatic interaction between the cationic dye and the anionic functional groups in the composts is not the only mechanism involved in adsorption. In conclusion, the use of composts for dye removal is a likely application, in particular for those composts presenting limitations for agricultural use.

Characterization Tests for Mineral Fillers Related to Performance of Asphalt Paving Mixtures

1998 ◽  
Vol 1638 (1) ◽  
pp. 101-110 ◽  
Author(s):  
Prithvi S. Kandhal ◽  
Cynthia Y. Lynn ◽  
Frazier Parker
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Permanent Deformation ◽  
Fatigue Cracking ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Moisture Susceptibility ◽  
Wide Range ◽  
Methylene Blue Test ◽  
Asphalt Paving

Various studies have shown that the properties of mineral filler, especially the material passing through a 0.075-mm (No. 200) sieve (generally called P200 material), have a significant effect on the performance of asphalt paving mixtures in terms of permanent deformation, fatigue cracking, and moisture susceptibility. However, researchers have employed different characterization tests for evaluating the P200 materials. This study was undertaken to determine which P200 characterization tests are most related to the performance of asphalt paving mixtures. Six P200 materials representing a wide range of mineralogical composition and particle size were used. These P200 materials were characterized by six tests including Rigden voids, particle size analysis, and methylene blue test. Mixes were prepared with two fines to asphalt ratios (0.8 and 1.5) by weight. Mix validation tests included the Superpave shear test for evaluating permanent deformation and fatigue cracking, and the Hamburg wheel tracking test and AASHTO T283 for evaluating moisture susceptibility of the 12 mixtures containing different P200 materials and fines to asphalt ratios. The particle sizes in microns corresponding to 60 and 10 percent passing and the methylene blue test were determined to be related to the performance of asphalt paving mixtures.

Preparation and Kinetic Property of Iron-Doped TiO2 Nanoparticles

2013 ◽  
Vol 760-762 ◽  
pp. 755-758
Author(s):  
Qing Li
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Sol Gel ◽  
Kinetic Property ◽  
Order Kinetic ◽  
Initial Concentration ◽  
First Order ◽  
Photo Catalysis ◽  
Supercritical Fluid Drying ◽  
Appearance Rate

nanoTiO2 photocatalyst powders were prepared through the sol-gel method and with supercritical fluid drying (SCFD). The SEMXRD and particle size distribution technique were used to characterize the hyperfine TiO2 particles.The reaction of photo-catalysis for methylene blue is in conformity with the first order kinetic law in appearance within the concentration range between 5mg/L and 15 mg/L. As the initial concentration methylene blue in water increase, the appearance rate constant of the reaction decreases while the half-life period of the reaction increases.

scholarly journals Preparation of the monodispersed carboxyl-functionalized polymer microspheres with disproportionated rosin moiety and adsorption of methylene blue

2018 ◽  
Vol 36 (5-6) ◽  
pp. 1260-1273 ◽  
Author(s):  
Cai-Li Yu ◽  
Feng Bian ◽  
Shu-Fen Zhang ◽  
Xu Xu ◽  
Peng Ren ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Raw Materials ◽  
Average Particle Size ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Average Particle ◽  
Polymer Microspheres ◽  
Carboxyl Content ◽  
Methylene Blue Adsorption

Carboxyl-functionalized polymer microspheres with a rosin moiety were prepared through dispersion polymerization using styrene, disproportionated rosin ester, and methylacrylic acid as raw materials. The effects of dispersion medium (ethanol/water) ratio, monomer mass proportion and initiator concentration on the polymer microspheres were studied. Scanning electron microscopy, laser particle size analysis, thermogravimetric analysis and Fourier transform infrared spectroscopy were used to characterize the microspheres, and their carboxyl contents were determined by the conductance titration method. The adsorption of methylene blue of the microspheres was also investigated. The results showed that rosin-based carboxyl-functionalized polymer microspheres were successfully synthesized. The microspheres exhibited smooth, spherical shapes with good monodispersity and high thermal stability. The carboxyl content of the microspheres prepared under optimum conditions was 0.089 mmol·g−1, with the average particle size approximately 950 nm. With increasing carboxyl contents of the polymer microspheres, their methylene blue adsorption capacities increased. The maximum methylene blue adsorption capacity of the microspheres was 59.55 mg·g−1 in the highest carboxyl content.

Green Synthesis of Silver Nanoparticles by Tannic Acid with Improved Catalytic Performance Towards the Reduction of Methylene Blue

NANO ◽  
2018 ◽  
Vol 13 (01) ◽  
pp. 1850003 ◽  
Author(s):  
Yueyue Hao ◽  
Nan Zhang ◽  
Jing Luo ◽  
Xiaoya Liu
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Tannic Acid ◽  
Molar Ratio ◽  
High Catalytic Activity ◽  
Ag Nps ◽  
Environmental Friendly ◽  
Vis Spectroscopy

In this work, a facile, environmental-friendly and cost-effective method was developed to prepare silver nanoparticles (Ag NPs) in aqueous solution at room temperature. In our approach, tannic acid was employed as the reducing agent and stabilizer simultaneously, avoiding the usage of any toxic agent. The tannic acid derived silver nanoparticles (TA-Ag NPs) were fully characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and thermogravimetric analyzer (TGA). The particle size of the synthesized TA-Ag NPs is tunable from 6.5[Formula: see text]nm to 19.2[Formula: see text]nm with narrow distribution by varying the molar ratio of TA to silver precursor. Efficient reduction of methylene blue (MB) catalyzed by TA-Ag NPs was observed, which was dependent upon the particle size of TA-Ag NPs or the TA concentration used for synthesis. By optimizing the TA concentration, complete reduction of MB was accomplished by TA-Ag NPs within 8[Formula: see text]min. The high catalytic activity of TA-Ag NPs was attributed to their nanosize and good dispersity as well as the electrostatic interaction between TA and MB which induces rapid enrichment of MB towards TA-Ag NPs, creating a locally concentrated layer of MB. Considering the facile and environmental-friendly preparation procedure and excellent catalytic activity, TA-Ag NPs are green, efficient and highly economical candidates for the catalysis of organic dyes and extendable of other reducible contaminants as well.

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