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

ABSTRAKTelah dilakukan penelitian tentang kemampuan fotodegradasi zat warna sintetik Methylene Blue dengan menggunakan nanopartikel Ag/CoFe2O4 dengan variasi perbandingan mol AgNO3:(Co(NO3)2.6H2O): (Fe(NO3)3.9H2O)= 0,3:0,7:2 dan jumlah ekstrak daun binahong (Anredera cordifolia (Ten) Steenis) yang ditambahkan 10 mL. Material tersebut dikarakterisasi menggunakan X-Ray Diffractometry (XRD), Scanning Electron Microscope (SEM) dan spektroskopi UV-vis. Kemampuan fotodegradasi dilakukan melalui penentuan konsentrasi Methylene Blue (konsentrasi awal 5 ppm) yang tersisa setelah berinteraksi dengan nanopartikel Ag/CoFe2O4 yang disinari sinar UV-A selama 30, 60, 120 dan 150 menit. Penentuan konsentrasi dihitung berdasarkan absorbansi yang didapatkan dari hasil pembacaan uji Spektrofotometri UV-vis, lalu digunakan rumus menghitung persen degradasi. Hasil penelitian menunjukkan bahwa yang memiliki kemampuan fotodegradasi paling baik adalah nanopartikel Ag/CoFe2O4 (0,3 : 0,7 : 2) mol dengan waktu kontak 120 menit, yaitu dengan nilai persen degradasi sebesar 44,84 %. ABSTRACTA research on photodegradation ability Methylene Blue dye synthetic by using Ag/CoFe2O4 nanoparticles with a mole ratio variation AgNO3 : (Co(NO3)2.6H2O) : (Fe(NO3)3.9H2O)= 0,3:0,7:2 and the amount of binahong (Anredera cordifolia (Ten) Steenis) leaf extract added 10 mL. These materials were characterized using X-Ray Diffractometry (XRD), Scanning Electron Microscope (SEM) and UV-vis Spectroscopy. Ability photodegradation done by determining the concentration of Methylene Blue is residue after the interaction with Ag/CoFe2O4 nanoparticles with irradiated UV-A for 30, 60, 120 and 150 minutes. Determining the concentration is calculated based on the absorbance obtained from the results of the analysis of UV-vis Spectrophotometry and then used a formula calculating the percent degradation. The results showed that the ability is best photodegradation Ag/CoFe2O4 nanoparticles (0,3: 0,7: 2) moles with a contact time of 120 minutes with a degradation value of 44.84%.

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Biosorption of lead ions by exopolysaccharide producing Azotobacter sp.

Journal of Environmental Biology ◽

10.22438/jeb/42/1/mrn-1231 ◽

2021 ◽

Vol 42 (1) ◽

pp. 40-50

Author(s):

P. Dhevagi ◽

◽

S. Priyatharshini ◽

A. Ramya ◽

M. Sudhakaran ◽

...

Keyword(s):

Response Surface Methodology ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Response Surface ◽

Functional Groups ◽

Contact Time ◽

Sewage Water ◽

Energy Dispersive ◽

X Ray ◽

Scanning Electron

Aim: Removal of lead from wastewater using Azotobacter species and optimisation of various parameters to maximise the adsorption of lead by response surface methodology as a tool. Methodology: The bacterial isolate UBI-7 recovered from sewage water irrigated soil was examined for its biosorption potential towards lead. The lead removal efficiency of Azotobacter salinestris was studied with respect to metal concentration (50-250 mg l-1), contact time (24-120 hrs), and pH (4-8).Using response surface methodology, these factors were optimized and R2 value obtained was 0.9710 for lead ions, which indicates the validity of the model. Observation with Fourier Transform Infrared (FTIR), Scanning Electron Microscope imaging (SEM) and Energy Dispersive X-ray Spectroscopic analysis (EDX) were carried out to confirm lead biosorption by Azotobacter salinestris. Results: The lead tolerant bacterium isolated from sewage water irrigated soil (UBI-7) was recognized as Azotobacter salinestris by 16S rRNA based gene sequence analysis. The highest removal percentage of Pb (61.54) was 50 mg l-1 in 72 hrs equilibration period. Interaction effect between different levels of Pb and different contact time of the solution were found to be significant. Lead biosorption by the organism was confirmed by the changes in stretching intensities of functional groups as well as appearance of strong OH stretching at 3291.69 cm-1. Images obtained from Scanning Electron Microscope and Energy Dispersive X-ray Spectroscopic studies of the bacteria (UBI-7) before and after biosorption clearly indicated lead adsorption. Interpretation: Current study proves that the functional groups of Azotobacter salinestris are involved in lead biosorption from aqueous solution which was confirmed through FTIR.EDX analysis also elucidated the lead absorption by the bacterial cells. Hence, this could be effectively utilized for decontamination of lead from the polluted environment. Key words: Azotobacter salinestris, Biosorption, Lead, Response surface methodology

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Ag/Nd2o3-Zno Nanocomposite: Visible Active Efficient Photocatalytic Degradation of Methylene Blue and Its Antibacterial Activity

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.b1177.1292s219 ◽

2019 ◽

Vol 9 (2S2) ◽

pp. 743-747

Keyword(s):

Methylene Blue ◽

Antibacterial Activity ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Visible Light ◽

Uv Spectroscopy ◽

Catalyst Loading ◽

X Ray ◽

Scanning Electron ◽

Catalyst Efficiency

In this scenario, the photocatalyst Ag/Nd2O3-ZnO (ANZ) are prepared under hydrothermal method and the complete build was confirmed by X-ray diffractometer, Scanning electron microscope with EDX spectroscopy. From the results, the crystalline structure was confirmed by PXRD spectroscopy. And in the SEM, spherical with sponge-like clustered morphology structure was shown and the presenting elements are confirmed by EDX spectroscopy. The suitable light needed for the degradation was selected by DRS-UV spectroscopy. The dye Methylene blue (MB) is degraded under visible light within 30 minutes with the efficiency of 98.12%. The catalyst is further analysed optimized concentration, different catalyst loading, and the catalyst efficiency was analyzed by reusability study. From the recyclability, the catalyst is stable up to the fifth run. Besides, the photocatalytic study the catalyst is analysed antibacterial activity. For the results, the Bacillus bacteria having more antibacterial activity compared to E.coli bacteria.

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Uji Efektivitas dan Karakterisasi Komposit Tanah Andisol/Arang Tempurung Kelapa Untuk Adsorpsi Logam Berat Besi (Fe)

ALCHEMY Jurnal Penelitian Kimia ◽

10.20961/alchemy.16.1.33286.50-66 ◽

2020 ◽

Vol 16 (1) ◽

pp. 50

Author(s):

Pranoto Pranoto ◽

Tri Martini ◽

Winda Maharditya

Keyword(s):

Fourier Transform ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Atomic Absorption Spectroscopy ◽

Contact Time ◽

Coconut Shell ◽

X Ray Diffraction ◽

X Ray ◽

Scanning Electron

Penelitian ini untuk mengetahui kapasitas adsorpsi komposit tanah andisol/arang tempurung kelapa sebagai adsorben logam berat besi (Fe) berdasarkan pada kondisi komposisi, pH dan waktu kontak yang optimum. Tanah andisol diaktivasi dengan larutan NaOH 3 M dan arang tempurung kelapa diaktivasi menggunakan larutan HCl 4 M. Komposit tanah andisol/arang tempurung kelapa dibuat dengan mencampurkan tanah andisol dan arang tempurung kelapa pada variasi komposisi 100:0, 75:25, 50:50, 25:75 dan 0:100 (b/b) Uji adsorpsi terhadap logam besi (Fe) dilakukan pada variasi pH larutan 1, 2, 3, 4, 5 dan 6 serta waktu kontak 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, dan 60 menit dengan sistem batch. Pengukuran konsentrasi akhir pada saat kesetimbangan dilakukan dengan menggunakan Atomic Absorption Spectroscopy (AAS). Hasil karakterisasi adanya proses aktivasi dan pengompositan ditunjukkan pada spektra Fourier Transform Infra Red (FTIR) yang mengalami pergeseran bilangan gelombang. Karakterisasi pola difraksi X-Ray Diffraction (XRD) yang menunjukkan adanya puncak baru. Hasil analisis Scanning Electron Microscope (SEM) komposit menunjukkan bahwa permukaan adsorben telah ditutupi logam besi (Fe). Pembentukan komposit juga menunjukkan adanya peningkatan luas permukaan dan nilai keasaman komposit. Berdasarkan penelitian ini diperoleh bahwa proses adsorpsi terjadi pada kondisi optimum komposisi komposit tanah andisol/arang tempurung kelapa 75:25 (b/b), pH larutan besi (Fe) 5 dan waktu kontak selama 30 menit dengan kapasitas adsorpsi sebesar 0,54 mg/g dan presentase adsorpsi 91,57%. Isoterm adsorpsi mengikuti isoterm Freundlich dengan nilai R2 sebesar 0,9456.Effectiveness Test and Characterization of Andisol Soil/Coconut Shell Charcoal for Adsorption of Iron (Fe). This research aims to determine the adsorption capacity composite of andisol soil and coconut shell charcoal as the adsorbent of iron (Fe) metal based on the composition condition, pH, and optimum contact time. Andisol soil was activated with NaOH 3 M solution, and coconut shell charcoal was activated with HCl 4 M solution. The composites were made under various composition of andisol soil/coconut shell charcoal of 100:0, 75:25, 50:50, 25:75 and 0:100 (w/w). The adsorption test was done on the pH variation of 1, 2, 3, 4, 5, 6 and used the contact time variation of 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 and 60 minutes in a batch method. The concentration analysis of iron (Fe) metal was done by atomic absorption spectroscopy (AAS). The characterization result of the activation process can be shown on the Fourier transform infrared (FTIR) spectra with the shifting peak. Characterization of X-ray diffraction (XRD) diffractogram showed the emergence of a new peak in andisol soil and coconut shell charcoal. The result of scanning electron microscope (SEM) characterization analysis showed that the surface of the adsorbent was covered in iron. The composite formation also showed an increase in surface area and composite acidity value. Based on the result of the research, it can be concluded that the adsorption process happens in the optimum condition in andisol soil/coconut shell charcoal composition of 75:25 (w/w), pH solution iron (Fe) metal of 5 and contact time of 30 minutes. The adsorption capacity was 0.54 mg/g and 91.57% for adsorption percentage. The isotherm adsorption followed Freundlich isotherm with R2 values 0.9456.

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Synthesis and Characterization of a Novel Netlike Nano-TiO2 with Polylactic Acid (PLA) as Template

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.233-235.623 ◽

2011 ◽

Vol 233-235 ◽

pp. 623-626 ◽

Cited By ~ 1

Author(s):

Ling Xin ◽

Bo Liu ◽

Jiu Hong Ai ◽

Jian Cheng Deng

Keyword(s):

Methylene Blue ◽

Electron Microscope ◽

Methyl Orange ◽

Scanning Electron Microscope ◽

Synthesis And Characterization ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Scanning Electron

Novel netlike nano-TiO2 was successfully prepared using polylatic acid (PLA) as a new template, and in particular, it was recyclable as photocatalyst. The products obtained at various temperatures were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and powder X-ray diffraction (XRD). Besides, the products have an excellent photocatalysis to methyl orange (MO) and methylene blue (MB).

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Uji Efektivitas dan Karakterisasi Komposit Tanah Andisol/Arang Tempurung Kelapa Untuk Adsorpsi Logam Berat Besi (Fe)

ALCHEMY Jurnal Penelitian Kimia ◽

10.20961/alchemy.16.1.33286.50-65 ◽

2020 ◽

Vol 16 (1) ◽

pp. 50

Author(s):

Pranoto Pranoto ◽

Tri Martini ◽

Winda Maharditya

Keyword(s):

Fourier Transform ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Atomic Absorption Spectroscopy ◽

Contact Time ◽

Coconut Shell ◽

X Ray Diffraction ◽

X Ray ◽

Scanning Electron

Penelitian ini untuk mengetahui kapasitas adsorpsi komposit tanah andisol/arang tempurung kelapa sebagai adsorben logam berat besi (Fe) berdasarkan pada kondisi komposisi, pH dan waktu kontak yang optimum. Tanah andisol diaktivasi dengan larutan NaOH 3 M dan arang tempurung kelapa diaktivasi menggunakan larutan HCl 4 M. Komposit tanah andisol/arang tempurung kelapa dibuat dengan mencampurkan tanah andisol dan arang tempurung kelapa pada variasi komposisi 100:0, 75:25, 50:50, 25:75 dan 0:100 (b/b) Uji adsorpsi terhadap logam besi (Fe) dilakukan pada variasi pH larutan 1, 2, 3, 4, 5 dan 6 serta waktu kontak 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, dan 60 menit dengan sistem batch. Pengukuran konsentrasi akhir pada saat kesetimbangan dilakukan dengan menggunakan Atomic Absorption Spectroscopy (AAS). Hasil karakterisasi adanya proses aktivasi dan pengompositan ditunjukkan pada spektra Fourier Transform Infra Red (FTIR) yang mengalami pergeseran bilangan gelombang. Karakterisasi pola difraksi X-Ray Diffraction (XRD) yang menunjukkan adanya puncak baru. Hasil analisis Scanning Electron Microscope (SEM) komposit menunjukkan bahwa permukaan adsorben telah ditutupi logam besi (Fe). Pembentukan komposit juga menunjukkan adanya peningkatan luas permukaan dan nilai keasaman komposit. Berdasarkan penelitian ini diperoleh bahwa proses adsorpsi terjadi pada kondisi optimum komposisi komposit tanah andisol/arang tempurung kelapa 75:25 (b/b), pH larutan besi (Fe) 5 dan waktu kontak selama 30 menit dengan kapasitas adsorpsi sebesar 0,54 mg/g dan presentase adsorpsi 91,57%. Isoterm adsorpsi mengikuti isoterm Freundlich dengan nilai R2 sebesar 0,9456.Effectiveness Test and Characterization of Andisol Soil/Coconut Shell Charcoal for Adsorption of Iron (Fe). This research aims to determine the adsorption capacity composite of andisol soil and coconut shell charcoal as the adsorbent of iron (Fe) metal based on the composition condition, pH, and optimum contact time. Andisol soil was activated with NaOH 3 M solution, and coconut shell charcoal was activated with HCl 4 M solution. The composites were made under various composition of andisol soil/coconut shell charcoal of 100:0, 75:25, 50:50, 25:75 and 0:100 (w/w). The adsorption test was done on the pH variation of 1, 2, 3, 4, 5, 6 and used the contact time variation of 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 and 60 minutes in a batch method. The concentration analysis of iron (Fe) metal was done by atomic absorption spectroscopy (AAS). The characterization result of the activation process can be shown on the Fourier transform infrared (FTIR) spectra with the shifting peak. Characterization of X-ray diffraction (XRD) diffractogram showed the emergence of a new peak in andisol soil and coconut shell charcoal. The result of scanning electron microscope (SEM) characterization analysis showed that the surface of the adsorbent was covered in iron. The composite formation also showed an increase in surface area and composite acidity value. Based on the result of the research, it can be concluded that the adsorption process happens in the optimum condition in andisol soil/coconut shell charcoal composition of 75:25 (w/w), pH solution iron (Fe) metal of 5 and contact time of 30 minutes. The adsorption capacity was 0.54 mg/g and 91.57% for adsorption percentage. The isotherm adsorption followed Freundlich isotherm with R2 values 0.9456.

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X-ray micro tomography in the scanning electron microscope

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100107678 ◽

1978 ◽

Vol 36 (1) ◽

pp. 106-107 ◽

Cited By ~ 1

Author(s):

W. Brünger

Keyword(s):

Electron Beam ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Target Surface ◽

The Body ◽

X Rays ◽

Cross Sectional ◽

X Ray ◽

Micro Tomography ◽

Scanning Electron

Reconstructive tomography is a new technique in diagnostic radiology for imaging cross-sectional planes of the human body /1/. A collimated beam of X-rays is scanned through a thin slice of the body and the transmitted intensity is recorded by a detector giving a linear shadow graph or projection (see fig. 1). Many of these projections at different angles are used to reconstruct the body-layer, usually with the aid of a computer. The picture element size of present tomographic scanners is approximately 1.1 mm2.Micro tomography can be realized using the very fine X-ray source generated by the focused electron beam of a scanning electron microscope (see fig. 2). The translation of the X-ray source is done by a line scan of the electron beam on a polished target surface /2/. Projections at different angles are produced by rotating the object.During the registration of a single scan the electron beam is deflected in one direction only, while both deflections are operating in the display tube.

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PHAX-SCAN: Functional integration of a Scanning Electron Microscope and an energy-dispersive x-ray analyser

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100152252 ◽

1989 ◽

Vol 47 ◽

pp. 56-57

Author(s):

Marc H. Peeters ◽

Max T. Otten

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

High Speed ◽

High Performance ◽

Functional Integration ◽

Energy Dispersive ◽

X Rays ◽

X Ray ◽

High Speed Analysis ◽

Scanning Electron

Over the past decades, the combination of energy-dispersive analysis of X-rays and scanning electron microscopy has proved to be a powerful tool for fast and reliable elemental characterization of a large variety of specimens. The technique has evolved rapidly from a purely qualitative characterization method to a reliable quantitative way of analysis. In the last 5 years, an increasing need for automation is observed, whereby energy-dispersive analysers control the beam and stage movement of the scanning electron microscope in order to collect digital X-ray images and perform unattended point analysis over multiple locations.The Philips High-speed Analysis of X-rays system (PHAX-Scan) makes use of the high performance dual-processor structure of the EDAX PV9900 analyser and the databus structure of the Philips series 500 scanning electron microscope to provide a highly automated, user-friendly and extremely fast microanalysis system. The software that runs on the hardware described above was specifically designed to provide the ultimate attainable speed on the system.

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PENGGUNAAN TiO2 PARTIKEL NANO HASIL SINTESIS BERBASIS AIR MENGGUNAKAN METODA SOL-GEL PADA BAHAN KAPAS SEBAGAI APLIKASI UNTUK TEKSTIL ANTI UV

Arena Tekstil ◽

10.31266/at.v28i1.1434 ◽

2013 ◽

Vol 28 (1) ◽

Author(s):

Maya Komalasari ◽

Bambang Sunendar

Keyword(s):

Fourier Transform ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Sol Gel ◽

Crosslinking Agent ◽

X Ray Diffraction ◽

Nano Tio2 ◽

X Ray ◽

Infra Red ◽

Scanning Electron

Partikel nano TiO2 berbasis air dengan pH basa telah berhasil disintesis dengan menggunakan metode sol-gel dan diimobilisasi pada kain kapas dengan menggunakan kitosan sebagai zat pengikat silang. Sintesis dilakukan dengan prekursor TiCl4 pada konsentrasi 0,3 M, 0,5 M dan 1 M, dan menggunakan templat kanji dengan proses kalsinasi pada suhu 500˚C selama 2 jam. Partikel nano TiO2 diaplikasikan ke kain kapas dengan metoda pad-dry-cure dan menggunakan kitosan sebagai crosslinking agent. Berdasarkan hasil Scanning Electron Microscope (SEM),diketahui bahwa morfologi partikel TiO2 berbentuk spherical dengan ukuran nano (kurang dari 100 nm). Karakterisasi X-Ray Diffraction (XRD) menunjukkan adanya tiga tipe struktur kristal utama, yaitu (100), (101) dan (102) dengan fasa kristal yang terbentuk adalah anatase dan rutile. Pada karakterisasi menggunakan SEM terhadap serbuk dari TiO2 yang telah diaplikasikan ke permukaan kain kapas, terlihat adanya imobilisasi partikel nano TiO2 melalui ikatan hidrogen silang dengan kitosan pada kain kapas. Hasil analisa tersebut kemudian dikonfirmasi dengan FTIR (Fourier Transform Infra Red) yang hasilnya memperlihatkan puncak serapan pada bilangan gelombang 3495 cm-1, 2546 cm-1, dan 511 cm-1, yang masing-masing diasumsikan sebagai adanya vibrasi gugus fungsi O-H, N-H dan Ti-O-Ti. Hasil SEM menunjukkan pula bahwa kristal nano yang terbentuk diantaranya adalah fasa rutile , yang berdasarkan literatur terbukti dapatberfungsi sebagai anti UV.

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THE USE OF PORTABLE X-RAY FLUORESCENCE, MAGNETIC SUSCEPTIBILITY, AND THE SCANNING ELECTRON MICROSCOPE TO CLASSIFY, CHARACTERIZE, AND DETERMINE THE REDOX STATE OF GRANITES

10.1130/abs/2017am-303581 ◽

2017 ◽

Author(s):

Jared R. Abbott ◽

◽

Steven A. Fellows ◽

Steven H. Emerman

Keyword(s):

Magnetic Susceptibility ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Redox State ◽

X Ray ◽

Scanning Electron

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