scholarly journals SINTESIS FOTOKATALIS NANOPARTIKEL ZnO UNTUK MENDEGRADASI ZAT WARNA METHYLENE BLUE

2020 ◽  
Vol 12 (2) ◽  
Author(s):  
Tirza C. Raganata ◽  
Henry Aritonang ◽  
Edi Suryanto
Keyword(s):  
Methylene Blue ◽  
Exposure Time ◽  
Zno Nanoparticles ◽  
Time Variation ◽  
Contact Time ◽  
Irradiation Time ◽  
Coprecipitation Method

ABSTRAKTelah dilakukan penelitian tentang fotokatalis metilen biru menggunakan nanopartikel ZnO yang disentisis dengan metode kopresipitasi. Kemampuan fotokatalis dilakukan terhadap zat warna methylene blue 5 ppm menggunakan fotokatalis ZnO yang disinari sinar UV-A selama 30, 60, 120, 150, dan 180 menit. Penentuan konsentrasi dihitung berdasarkan absorbansi yang didapatkan dari hasil Spektrofotometri UV-Vis dan dalam rumus menghitung % degradasi. Hasil penelitian menunjukkan bahwa yang memiliki kemampuan fotokatalis paling baik adalah Nanopartikel ZnO 10% yaitu dengan nilai persen degradasi untuk variasi waktu penyinaran 30 menit adalah sebesar 51,82%, 60 menit sebesar 65,26%, 120 menit sebesar 71,25%, 150 menit sebesar 75,78%, dan 180 menit sebesar 71,01%. Dan waktu penyinaran optimum terjadi pada waktu kontak 150 menit. ABSTRACTA research on photocatalysts of methylene blue using ZnO nanoparticles were analyzed using coprecipitation method. The ability of photocatalysts was carried out on 5 ppm methylene blue dyes using ZnO photocatalysts which were exposed to UV-A rays for 30, 60, 120, 150, and 180 minutes. Determination of concentration was calculated based on the absorbance obtained from the results of the UV-Vis Spectrophotometry test reading and in the formula to calculate% degradation. The results showed that the best photocatalysts ability was ZnO 10% nanoparticles, ie the percent degradation value for 30 minutes irradiation time variation was 51.82%, 60 minutes was 65.26%, 120 minutes was 71.25%, 150 minutes at 75.78%, and 180 minutes at 71.01%. And the optimum exposure time occurs at 150 minutes contact time. 

scholarly journals Antibacterial efficacy of photodynamic therapy in the disinfection of root canals - Integrative literature review

2020 ◽  
Vol 33 (2) ◽  
pp. 147-158
Author(s):  
Danyllo Guimarães Morais Barros ◽  
Diego Filipe Bezerra Silva ◽  
Gustavo Araújo de Freitas ◽  
Gabriella De Vasconcelos Neves ◽  
Jozinete Vieira Pereira ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Methylene Blue ◽  
Exposure Time ◽  
Irradiation Time ◽  
Light Sources ◽  
Antibacterial Efficacy ◽  
Review Of The Literature ◽  
Inclusion Criteria ◽  
Bacterial Populations ◽  
Root Canals

To evaluate the antibacterial efficacy of hotodynamic Therapy (PDT) in root canal (RC) disinfection. An integrative review of the literature was performed in diferents databases. It was selected articles published between January 2014 and January 2018, in Portuguese, English or Spanish languages, which evaluated, in a clinical trial, the antibacterial efficacy of PDT in RC disinfection. The sample consisted of 05 articles that met all the inclusion criteria, which analyzed aspects such as: sample; photosensitizer and exposure time; light source, wavelength, potency, energy and time of emission; and results. Most of the studies used single-rooted teeth and methylene blue photosensitizer with pre-irradiation time ranging from 1 to 5 minutes. The LED and the laser were the light sources used, with exposure time ranging from 40 to 240 seconds; power from 60 mW to 1000 mW; power density from 2 to 4 mW / cm2; energy of 4 to 9,6 J; and dose from 1.2 mJ / cm2 to 129 J / cm2. It can be concluded that, despite the heterogeneity of the protocols, there was a reduction in the bacterial populations responsible for RC infections, and it may be a supporting technique in endodontic therapy.

scholarly journals SINTESIS NANOPARTIKEL COBALT FERRITE (CoFe2O4) DENGAN METODE KOPRESIPITASI DAN APLIKASINYA SEBAGAI FOTOKATALIS

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Suaib Suaib ◽  
Henry Aritonang ◽  
Harry S. J. Koleangan
Keyword(s):  
Methylene Blue ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Exposure Time ◽  
Contact Time ◽  
Cobalt Ferrite ◽  
Cofe2o4 Nanoparticles ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Scanning Electron

ABSTRAKTelah dilakukan penelitian tentang kemampuan fotokatalis nanopartikel CoFe2O4 dalam mendegradasi zat warna sintetik Methylene Blue (MB) menggunakan metode kopresipitasi. Nanopartikel tersebut dikarakterisasi menggunakan X-Ray Diffractometry (XRD), Scanning Electron Microscope (SEM) dan spektroskopi UV-vis. Kemampuan fotokatalis dilakukan melalui penentuan konsentrasi Methylene Blue yang tersisa setelah waktu kontak nanopartikel CoFe2O4 dengan larutan Methylene Blue 5 ppm yang disinari sinar UV-A selama 30, 45, 60, 90 dan 120 menit.  Penentuan konsentrasi dihitung berdasarkan absorbansi yang didapatkan dari hasil pembacaan uji Spektrofotometri UV-vis lalu digunakan rumus menghitung % degradasi. Hasil penelitian menunjukkan bahwa kemampuan fotokatalis paling baik adalah nanopartikel CoFe2O4 dengan nilai % degradasi untuk variasi waktu penyinaran 60 menit adalah sebesar 40,72 %. ABSTRACTA research on the ability of CoFe2O4 nanoparticles degradation of as photocatalyst to dyemethylene Blue(MB) synthetic using coprecipitation method. The nanoparticles were characterized using X-ray diffractometry (XRD), Scanning Electron Microscope (SEM) and UV-Vis spectroscopy. The ability of the photocatalyst is done by determining the concentration of Methylene Blue residu after contact time of CoFe2O4 nanoparticleswith a solution of Methylene Blue 5 ppm irradiated UV-A for 30, 45, 60, 90 and 120 minutes. Determining the concentration is calculated based on the absorbance obtained from the results of analysis UV-vis spectrophotometry and then used a formula calculating the% degradation. The results showed that ability is the best photocatalyst CoFe2O4 nanoparticles with the value of% degradation for variations in exposure time of 60 minutes is equal to 40.72 %. 

scholarly journals Preparation of Composite Derived from Banana Peel Activated Carbon and MgFe2O4 as Magnetic Adsorbent for Methylene Blue Removal

2021 ◽  
Vol 23 (12) ◽  
pp. 440-448
Author(s):  
Arie Hardian ◽  
Rosi Rosidah ◽  
Senadi Budiman ◽  
Dani Gustaman Syarif
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Surface Area ◽  
Textile Industry ◽  
Contact Time ◽  
Magnetic Adsorbent ◽  
X Ray ◽  
Industry Waste ◽  
Adsorption Performance

Methylene blue (MB) is one of the dyes used often by the textile industry. Therefore, MB residual is contained in the textile industry waste. MB can irritate, leading to permanent eye and animal injuries; therefore, the textile industry waste concentration must be degraded before disposed to the environment. MB residual in textile industry waste can be treated with activated carbon adsorption. However, the adsorption method is less effective because the deposition takes a long time. This research aims to make activated carbon composites from banana peels and magnesium ferrite (BPAC/MgFe2O4) using the coprecipitation method to obtain activated carbon with magnetic properties (magnetic adsorbent). The obtained composite was characterized using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive X-Ray (EDX), and Surface Area Analyzer. The adsorption performance of methylene blue on composites was evaluated with variations in pH, concentration, contact time, determination of adsorption isotherms, and kinetics of adsorption. XRD analysis results showed the composite has a cubic crystal structure with a crystallite size of 7.69 nm. SEM analysis results show the surface morphology has pores with irregular shapes. EDX analysis results showed that the composition of activated carbon composite was 65.56% carbon, 2.28% Mg, 5.50% Fe, and 26.66% O. The results surface area analysis showed a composite surface area of 88.134 m2/g. Composite adsorption performance showed maximum results at pH 7, variations in concentration at 10 ppm, and contact time 180 minutes with adsorption capability of 99.26%. Determination of the adsorption isotherm follows the Freundlich adsorption isotherm model with a pseudo-second-order adsorption kinetics model. The obtained BPAC/MgFe2O4 composite can potentially be a magnetic adsorbent capable of adsorbing methylene blue in an aqueous solution.

scholarly journals Synthesis of TiO2-NiFe2O4 nanocomposites using coprecipitation method as photocatalyst for methylene blue removal

2021 ◽  
Vol 882 (1) ◽  
pp. 012022
Author(s):  
A Hardian ◽  
Devikha ◽  
S Budiman ◽  
T Yuliana ◽  
H Sujono ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Textile Industry ◽  
Irradiation Time ◽  
Average Crystallite Size ◽  
Coprecipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Adsorption Performance ◽  
Methylene Blue Removal ◽  
Ferrite Spinel

Abstract Methylene blue, a basic dye that is important in the coloring process in the textile industry. However, the use of the dye Methylene blue is hazardous for the skin, the eyes, and swallowed. Three composition types of TiO2-NiFe2O4 nanocomposites (75:25, 50:50, and 25:75) had been synthesized using a simple coprecipitation method. The photodegradation and adsorption performance of the nanocomposites were also evaluated. Based on X-ray diffraction analysis, both the titania anatase and nickel ferrite spinel phases appeared in each nanocomposite’s diffraction pattern. The average crystallite size of the nanocomposites was 38 nm, 33 nm, and 41 nm for compositions 75:25, 50:50, and 25:75, respectively. The optimum photodegradation activity of TiO2-NiFe2O4 nanocomposites was achieved at composition 75:25 %mol with >99% methylene blue degraded during 120 minutes of UV irradiation time. However, all nanocomposites also have adsorption capability toward methylene blue with an optimum percentage of 98%. Therefore, TiO2-NiFe2O4 nanocomposites can be used either as photocatalysts or adsorbents for methylene blue removal in an aqueous solution.

scholarly journals Synthesis & Characterization of Magnetit (Fe3O4) and Its Applications As Adsorbent Methylene Blue

2017 ◽  
Vol 11 (2) ◽  
pp. 61
Author(s):  
Retno Agnestisia
Keyword(s):  
Methylene Blue ◽  
Contact Time ◽  
Coprecipitation Method ◽  
X Ray Diffraction ◽  
Ph Optimum ◽  
Adsorption Study ◽  
Batch System ◽  
Optimum Ph ◽  
Blue Solution

Synthesis, characterization and adsorption study of magnetite have beenconducted. Magnetite was synthesized by coprecipitation method. The characterizations of magnetite were carried out with spectroscopy FTIR (Fourier Transform Infrared) and XRD (X-ray diffraction). The adsorption study was conducted using a batch system with the studied adsorption study including optimum pH, optimum contact time and adsorption equilibrium. The results showed that coprecipitation method has succeeded to form magnetite that has magnetism properties. Magnetite can adsorbed methylene blue from aqueous phase, with the maximum adsorption at pH 5 and contact time of 90 minutes.Adsorption of methylene blue by magnetite follows the adsorption pattern of the Langmuir isotherm with the adsorption energy of 25.59 kJ/mol and adsorption capacity of 43.86 mg/g. The results of magnetite synthesis can accelerate the process of separating the adsorbent particles in a methylene blue solution using an external magnetic field.Keywords : magnetite, coprecipitation, adsorption, and methylene blue.

Removal of methylene blue by orange and uvaia seeds

2015 ◽  
Vol 3 (3) ◽  
pp. 236-251
Author(s):  
Bianca Mesquita Coelho Botrel ◽  
Zuy Maria Magriotis ◽  
Adelir Aparecida Saczk ◽  
Sabrina Mesquita Coelho ◽  
Priscila Ferreira De Sales
Keyword(s):  
Methylene Blue ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Contact Time ◽  
Low Cost ◽  
Acid Sites ◽  
Maximum Adsorption Capacity ◽  
Elemental Chemical Analysis

In this study, the adsorption behavior of methylene blue (MB) was investigated using orange seed (OS) and uvaia seed (US) as low cost adsorbents. These materials were characterized using FTIR (Fourier transform infrared spectroscopy), elemental chemical analysis (CHNO), thermogravimetric analysis (TGA), zeta potential, specific surface area and a test for determination of acid sites. The parameters evaluated in the kinetic study of adsorption were contact time, initial dye concentration, mass of adsorbent and pH. The adsorption of MB onto OS and US samples could be explained by Elovich ?s kinetic model. The experimental isotherms data, carried out at the temperatures of 25°C, 35°C, 45°C and 55°C, were better represented by Sips. It was verified that the adsorption was spontaneous and endothermic according to the thermodynamic parameters ?G°, ?H ° and ?S ° evaluated. The OS and US maximum adsorption capacity at the temperature of 25°C was 38 mg g-1 and 48 mg g-1 , respectively. The reuse tests performed at three subsequent times showed that there was no significant decrease regarding the materials efficiency, therefore emphasizing its viability as biosorbents.

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