Browsing by Author "Yanuar, Yanuar"

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    GREEN SINTESIS NANOPARTIKEL PERAK DENGAN BANTUAN PEREDUKSI EKSTRAK BUAH SIRSAK (ANNONA MURICATA LINN): KARAKTERISASI OPTIK DAN MORFOLOGI
    (2021-02) Azizah, Siti Nor; Yanuar, Yanuar
    Silver nanoparticles have been successfully synthesized based on Annona muricata fruit extract. The silver nanoparticle has been synthesis started by mixing with the solution of Annona muricata fruit extract (50 g/L) and AgNO3 (0,01 M) with a volume variation of 10:30 (ml) using the reduction method. The optical characterization includes a UV-Vis spectrophotometer to observe the silver nanoparticle optical properties and Scanning Electron Microscope to determine the morphology and grain size distribution of the nanoparticles. Synthesis of silver nanoparticles based Annona muricata fruit extract using a UV-Vis spectrophotometer resulted in a peak absorbance of Surface Plasmon Resonance at a wavelength of 427 nm. Scanning Electron Microscope characterization results showed that the size of silver nanoparticles was about 19 nm to 53 nm with spherical morphology
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    PEMBUATAN DAN KARAKTERISASI NANOPARTIKEL PERAK MENGGUNAKAN EKSTRAK KULIT BUAH NAGA MERAH SEBAGAI PENDEGRADASI METILEN BIRU
    (2020-10) Lumbantobing, Purnama; Yanuar, Yanuar
    This search has been done manufacture and characterization of silver nanoparticles using red dragon skin extract as a methylene blue degradation. This research was aims to synthesize nanoparticles using red dragon fruit peel extract characterized using a UV-Vis spectrophotometer and characterization using TEM and determining the degradation activity of methylene blue which was tested absorption using a UV-Vis spectrophotometer. Silver nanoparticles with a volume of 5 ml red dragon fruit peel extract and 35 ml silver solution (1:7). Synthesis of silver nanoparticles in red dragon fruit peel extract using a UV-Vis spectrophotometer which is produced an absorbance of 0,9878 a.u at a wavelength of 433 nm. Characterization using TEM was to produce a particle size of 10,17-18,15 nm with a particle structure of FCC. The degradation activity of methylene blue for the absorption test using UV-Vis spectrophotometer at a concentration of 25 ppm, 50 ppm dan 75 ppm in an optimal time of 8 hours resulted in degradation efficiency values of 99,64%, 99,17% and 99,27%.
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    POTENSI NANOPARTIKEL ZnO DARI EKSTRAK DAUN SIRSAK UNTUK MENDEGRADASI METILEN BIRU
    (Elfitra, 2022-01) Novianti, Nindy; Yanuar, Yanuar
    The rapid development of the textile industry can increase the production of waste produced such as dye wastes. Methylene blue is the most widely used dye in the industry and is harmful to live organisms and the environment due to its resistance to degradation. This study aims to synthesize and characterize ZnO nanoparticles photocatalyst using Annona muricata L. leaf extract as a bioreductor that can degrade methylene blue and effects of contact time on degradation activity. The synthesis process had mixed with Annona muricata L. leaf extract and the solution ZnO(NO3)2 0.05 M with a volume ratio of 1:5 and added with a few drops of NaOH solution 1M to pH of 12. The biosynthesis process had carried out at a temperature of 80oC for 1 hour. Nanoparticles ZnO had formed, characterized using a UV-Vis spectrophotometer result absorbance spectrum shows highest absorption peaks that occur at wavelengths of 321 nm, is the ultraviolet spectrum area that is the feature of ZnO. The degradation activity of methylene blue 5 ppm was calculated based on the absorbance of the UV-Vis Spectrophotometry with an optimum time of 150 minutes resulted in the degradation efficiency of 35.79%.
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    SINTESIS DAN KARAKTERISASI NANOPARTIKEL ZnO MENGGUNAKAN EKSTRAK DAUN KETAPANG UNTUK MENDEGRADASI METILEN BIRU
    (perpustakaan UR, 2021-08) Siregar, Afriana; Yanuar, Yanuar
    Synthesis and characterization of ZnO nanoparticles have been successfully carried out using ketapang leaf extract to degrade methylene blue. ZnO nanoparticles were formed through the synthesis of a 0.05 M solution of ZnO(NO3)2 with ketapang leaf extract. The synthesis was carried out using variations in the volume of the ketapang leaf extract and zinc nitrate solution, namely A (1:3), B (1:5) and C (1:7) and then 1 M NaOH was added until each variation showed a pH of 12. The results were characterized using UV-Vis Spectrophotometer resulting in absorbance values of 0.619; 1.196 and 1.095. X-ray diffraction (XRD) characterization of sample B showed that the particle size is in the range of 10.59-23.73 nm with Miller indices of (100); (002); (101); (012) ; (110); (013) and (112). SEM characterization showed the presence of nano-flower morphology with size distribution in the range of 400-494 nm. The degradation activity of methylene blue for absorption test using UV-Vis Spectrophotometer at a concentration of 25 ppm with an optimum time of 6 hours resulted in the degradation efficiency of 29 %, 32,2 % and 36,7 %.