scholarly journals DIAGNOSTICS OF UNFIRED EARTH WITH METHYLENE BLUE TEST

2020 ◽  
Vol 26 ◽  
pp. 50-55
Author(s):  
Tereza Plaček Otcovská ◽  
Barbora Mužíková ◽  
Pavel Padevět
Keyword(s):  
Methylene Blue ◽  
Experimental Measurement ◽  
Montmorillonite Clay ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Methylene Blue Solution ◽  
Dye Absorption ◽  
Stirring Time ◽  
Methylene Blue Test ◽  
Blue Solution

Unfired earth is important historic building material. Final properties of unfired earth constructions are influenced by amount and kind of clay in earth mixtures. Methylene blue test is a method that helps determining the type and amount of clay in earth mixtures. This paper describes research focused on using methylene blue test for analysis of methylene blue dye absorption by montmorillonite clay. The first part of the paper describes principle of methylene blue test and course of experimental measurement. The second part deals with analysis of obtained results. On the basis of experimental measurement it can be stated that methylene blue test is influenced by the stirring time of earth samples with methylene blue solution and dependence between amount of methylene blue dye absorption and amount of montmorillonite clay in earth samples is linear.

Fabrication and characterization of Fe2O3, Bi2O3 and BiFeO3 and evaluation of their photo catalytic performances on degradation of methylene blue dye

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Fiza Akram ◽  
Muhammad Saeed ◽  
Javaid Akhtar ◽  
Syed Ali Raza Naqvi ◽  
Atta ul Haq
Keyword(s):  
Methylene Blue ◽  
Free Energy ◽  
Dye Degradation ◽  
Precipitation Method ◽  
Blue Dye ◽  
X Rays ◽  
Methylene Blue Dye ◽  
X Ray Diffraction ◽  
Blue Solution

Abstract This study reports the fabrication of Fe2O3, Bi2O3, and BiFeO3, characterization and evaluation of the photocatalytic performances for methylene blue dye degradation. The materials were synthesized by precipitation method and characterized by scanning electron microscopy, X-ray diffraction, energy dispersive X-rays analyses, and Fourier transform infrared analyses. The photocatalytic activities of Fe2O3, Bi2O3, and BiFeO3 were compared by performing degradation experiments with 50 mL of 100 mg/L methylene blue solution. The as-prepared BiFeO3 was found as 2.4 times and 1.7 times more effective than Fe2O3 and Bi2O3, with a 79, 47, and 57% catalytic activity, respectively. The degradation of methylene blue over the BiFeO3 catalyst was optimized in terms of pH, catalyst dosage, temperature, and methylene blue concentration. The Eley–Rideal mechanism was proposed to describe the reaction kinetics in terms of the first order and second order kinetics model. Activation energy E (kJ/mol), enthalpy ΔH (kJ/mol), entropy ΔS (J/mol) and free energy ΔG (kJ/mol) were calculated as 20.8, 18.2, 197.5 and −45.3 respectively. The negative value of free energy shows that photodegradation is favored in present conditions.

scholarly journals Drug Delivery Stimulation by Alternating Current Using Methylene Blue Dye Absorption by Pig?s Skin as a Model

2013 ◽  
pp. 14-24
Author(s):  
Lobna A. Elnahas ◽  
Mohamed A. Elblbesy ◽  
Youssef S. Youssef ◽  
Thanaa E Shalaby ◽  
Mona A Yehia
Keyword(s):  
Drug Delivery ◽  
Methylene Blue ◽  
Alternating Current ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Dye Absorption

Experimental investigation on the preparation of active carbon with cottonwood based on phosphoric acid activation method

2020 ◽  
Vol 10 (4) ◽  
pp. 531-536
Author(s):  
Junxia Zhang ◽  
Zehua Wang ◽  
Lihua Zou
Keyword(s):  
Methylene Blue ◽  
Phosphoric Acid ◽  
Active Carbon ◽  
Acid Activation ◽  
Methylene Blue Solution ◽  
Activation Time ◽  
Activation Temperature ◽  
Impregnation Ratio ◽  
Stirring Time ◽  
Blue Solution

Active carbon was prepared experimentally by means of drying and crushing cottonwood via the phosphoric acid activation method. The effects of the activation temperature, impregnation ratio, phosphoric acid concentration, and activation time on the performance of the active carbon were analyzed. The optimum parameters of active carbon preparation, including the 60% concentration of the phosphoric acid, 1:4 impregnation ratio, 4 h activation time, and 500 °C activation temperature, were proposed. The features of the active carbon were analyzed with a scanning electron microscope and Fourier-transform infrared spectroscopy. The specific surface area was 1020 m2 · g-1, and the average pore diameter and the overall pore volume were 3.01 nm and 0.96 cm3 · g-1, respectively. These active carbon performance parameters prepared via the present method were compared with experimental data from relevant references. The adsorbance of the active carbon to the methylene blue solution was analyzed. Results showed that the adsorbance of the active carbon increased with the increment in the concentration of the methylene blue solution, stirring time, and the dosage of the active carbon. Therefore, 9.2% is the best adsorption amount of active carbon to the methylene blue solution at 25 mg/L methylene blue solution concentration, 30 mg active carbon mass fraction, and 4 h stirring time.

scholarly journals INFLUENCE OF EARTH COMPOSITION ON ADSORPTION CAPACITY OF METHYLENE BLUE DYE

2021 ◽  
Vol 30 ◽  
pp. 63-68
Author(s):  
Tereza Plaček Otcovská ◽  
Barbora Mužíková ◽  
Pavel Padevět
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Blue Dye ◽  
Building Structures ◽  
Methylene Blue Dye ◽  
Essential Component ◽  
Experimental Measure ◽  
Methylene Blue Test

Final properties of unfired earth are influenced by composition of earth mixtures. Methylene blue test could be useful method for analysis of earth composition. This would facilitate of designing unfired earth building structures because composition of natural earth is various. Principle of methylene blue test is measure of amount of adsorbed methylene blue dye by clay. The essential component of earth mixtures is clay because clay fulfils a function of binder. Experimental measure of adsorption capacity of individual kind of clay is described in this paper. Adsorption capacity was investigated in montmorillonite, kaolinite, illite-kaolinite and illite clays. The obtained results show that the adsorption capacity of clays is significantly different.

Using of modified-bentonite as low-cost sorbent for removal of methylene blue dye from aqueous solution

2020 ◽  
Vol 27 (2) ◽  
pp. 45-54
Author(s):  
Saraa Muwafaq Ibrahim ◽  
Ziad T. Abd Ali
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Silanol Group ◽  
Infrared Spectrometry ◽  
Blue Dye ◽  
Ammonium Bromide ◽  
Vibration Band ◽  
Order Kinetic ◽  
Methylene Blue Dye ◽  
Modified Bentonite

Batch experiments have been studied to remove methylene blue dye (MB) from aqueous solution using modified bentonite. The modified bentonite was synthesized by replacing exchangeable calcium cations in natural bentonite with cationic surfactant cetyl trimethyl ammonium bromide (CTAB). The characteristics of modified bentonite were studied using different analysis such as Scanning electronic microscopy (SEM), Fourier transform infrared spectrometry (FTIR) and surface area. Where SEM shows the natural bentonite has a porous structure, a rough and uneven appearance with scattered and different block structure sizes, while the modified bentonite surface morphology was smooth and supplemented by a limited number of holes. On other hand, (FTIR) analysis that proved NH group aliphatic and aromatic group of MB and silanol group are responsible for the sorption of contaminate. The organic matter peaks at 2848 and 2930 cm-1 in the spectra of modified bentonite which are sharper than those of the natural bentonite were assigned to the CH2 scissor vibration band and the symmetrical CH3 stretching absorption band, respectively, also the 2930 cm-1 peak is assigned to CH stretching band. The batch study was provided the maximum removal efficiency (99.99 % MB) with a sorption capacity of 129.87 mg/g at specified conditions (100 mg/L, 25℃, pH 11 and 250rpm). The sorption isotherm data fitted well with the Freundlich isotherm model. The kinetic studies were revealed that the sorption follows a pseudo-second-order kinetic model which indicates chemisorption between sorbent and sorbate molecules.

Adsorption Studies of Methylene Blue Dye using Biosorbents

2018 ◽  
Vol 8 (3) ◽  
pp. 502-513
Author(s):  
Saravanan Narayanan ◽  
Rathika Govindasamy
Keyword(s):  
Methylene Blue ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Adsorption Studies

scholarly journals Characterization and use of a lignin sample extracted from Eucalyptus grandis sawdust for the removal of methylene blue dye

2021 ◽  
Vol 170 ◽  
pp. 375-389
Author(s):  
Alexandra Cemin ◽  
Fabrício Ferrarini ◽  
Matheus Poletto ◽  
Luis R. Bonetto ◽  
Jordana Bortoluz ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Eucalyptus Grandis ◽  
Blue Dye ◽  
Methylene Blue Dye

scholarly journals Highly Porous and Ultra-Lightweight Aero-Ga2O3: Enhancement of Photocatalytic Activity by Noble Metals

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1985
Author(s):  
Irina Plesco ◽  
Vladimir Ciobanu ◽  
Tudor Braniste ◽  
Veaceslav Ursaki ◽  
Florian Rasch ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Noble Metals ◽  
Hybrid Structures ◽  
Blue Dye ◽  
Light Illumination ◽  
Methylene Blue Dye ◽  
Visible Light Illumination ◽  
New Type ◽  
Highly Porous

A new type of photocatalyst is proposed on the basis of aero-β-Ga2O3, which is a material constructed from a network of interconnected tetrapods with arms in the form of microtubes with nanometric walls. The aero-Ga2O3 material is obtained by annealing of aero-GaN fabricated by epitaxial growth on ZnO microtetrapods. The hybrid structures composed of aero-Ga2O3 functionalized with Au or Pt nanodots were tested for the photocatalytic degradation of methylene blue dye under UV or visible light illumination. The functionalization of aero-Ga2O3 with noble metals results in the enhancement of the photocatalytic performances of bare material, reaching the performances inherent to ZnO while gaining the advantage of the increased chemical stability. The mechanisms of enhancement of the photocatalytic properties by activating aero-Ga2O3 with noble metals are discussed to elucidate their potential for environmental applications.

Sign in / Sign up

Export Citation Format

Share Document