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All Journal Indonesian Journal of Chemistry and Environment Jurnal Riset Pembelajaran Kimia
Cornelia Budimarwanti
Universitas Negeri Yogyakarta
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Education Materials Science & Nanotechnology

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Synthesis of ZnO Nanoparticles from Zink Acetate using Red Betel and Bay Leaves Extract and It’s Application as Sunscreen Karim Theresih; Cornelia Budimarwanti; Indyah Sulistyo Arty; Sri Handayani; Novia Putri Ramadhani; Rakhmawati Kurniasih
Indonesian Journal of Chemistry and Environment Vol 4, No 1 (2021): JUNE 2021
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (567.186 KB) | DOI: 10.21831/ijoce.v4i1.45299

Abstract

The ZnO nanoparticles have been synthesized using red betel and bay leaves extract and characterized to analyze the maximum wavelength, crystallinity, particle size, composition, and its activity as sunscreen. The synthesis of ZnO nanoparticles was carried out through reflux method using Zn(CH3COO)2. 2H2O red betel leaf as bioreductor. The same procedure was also applied by changing the betel leaf extract with bay leaf extract. The resulted materials were characterized by UV-Vis spectrophotometry, FTIR, PSA, XRD, and SEM EDX. The ZnO nanoparticles synthesized with red betel leaf have a maximum wavelength of 374.5 nm, wave number of 462.92 cm-1, particle size of 23.309 nm, 74.1% of Zn and 16% of O, SPF value of 8.047942. ZnO nanoparticles synthesized using bay leaf extract have a maximum wavelength of 374 nm, high crystallinity properties with a hexagonal crystal structure, an average particle size of 2.463 nm, 64.21% of Zn and 22.85%, and an SPF value of 2.886969. The activity test of ZnO nanoparticles as sunscreen showed that synthesis both using red betel and by leaves extract resulted in a good sunscreen activity test comparing with ZnO synthesized using ethanol as a control. Thus the synthesis of ZnO nanoparticles using natural extract is being a better way to use as a green synthesis that environmentally friendly.
Synthesis of Vanillyl Acetate Through Fischer Esterification of Acetic Acid and Vanillyl Alcohol Product of Vanillyl Reduction Chintya Ayu Triwijayanti; Cornelia Budimarwanti
Indonesian Journal of Chemistry and Environment Vol 5, No 2 (2022): DECEMBER 2022
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v5i2.54577

Abstract

The aims of this research are (1) synthesis of vanillyl alcohol compounds using sodium borohydride (NaBH4) and synthesis of vanillyl acetate compounds through Fischer esterification reaction between acetic acid and vanillyl alcohol from reduced product of vanillin, (2) characterization of vanillyl alcohol compounds and vanillyl acetate compounds using Thin Layer Chromatography (TLC), Fourier transform Infrared (FTIR) and Gas Chromatography Mass Spectroscopy (GS-MS). Vanillyl alcohol was obtained by reducing the aldehyde group of vanillin using sodium borohydride (NaBH4). Through the Fischer esterification reaction between the reduced compound of vanillin and acetic acid using H2SO4 as a catalyst, vanillyl acetate was characterized using TLC, FTIR, and GC-MS. The identification results using TLC showed the appearance of the functional group OH alcohol and CO alcohol in the area of 3442.22 cm-1 and 1153.99 cm-1 on the IR spectrum of vanillyl alcohol. Identification using GC-MS stated that vanillyl alcohol has a purity of 91.13% of 154 m/z value in the yield of 59.74%. The results of the esterification reaction form the brown solids with a yield of 63.98%. Meanwhile, the characterization results using TLC showed that the synthesis of vanillyl acetate has been formed by the appearance of the functional group C=O ester at a wave number of 1738.59 cm-1 and CO ester at 1274,2 cm-1 on the IR spectrum of vanillyl acetate.
“RUMAHKU LABORATORIUM KIMIAKU”, BUKU EKSPERIMEN KIMIA DI KEHIDUPAN SEHARI-HARI SEBAGAI PENERAPAN KONSEP MATERI KIMIA DI SMA Yohanes Dedi Kurniawan; Cornelia Budimarwanti
Jurnal Riset Pembelajaran Kimia Vol 8, No 2 (2023): Jurnal Riset Pembelajaran Kimia
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jrpk.v8i2.20631

Abstract

Penelitian ini adalah penelitian pengembangan dalam bidang pendidikan kimia. Tujuan dari penelitian ini adalah mengembangkan buku pedoman guru yang berisikan eksperimen kimia di kehidupan sehari-hari dan mengetahui kelayakan media pembelajaran berdasarkan penilaian 5 guru SMA. Dalam pengembangan buku eksperimen kimia peneliti menggunakan metode ADDIE yang terdiri dari 4 tahap, yaitu analisis, perencanaan, pengembangan dan implementasi. Buku eksperimen kimia yang telah dibuat kemudian divalidasi oleh dosen pembimbing, ahli media, ahli materi dan pembelajaran kimia. Kemudian produk dinilai oleh 5 guru kimia SMA sebagai reviewerKualitas buku eksperimen kimia dapat diketahui melalui penilaian lima guru kimia SMA yang ditinjau dari aspek isi, aspek kebahasaan, aspek penyajian, efek media terhadap strategi pembelajaran dan tampilan. Buku eksperimen kimia yang dikembangkan mendapat skor rata-rata 4,14 dari skor maksimal ideal 5 dengan kategori baik (B).
Co-Authors Chintya Ayu Triwijayanti Indyah Sulistyo Arty Karim Theresih Novia Putri Ramadhani Rakhmawati Kurniasih Sri Handayani Yohanes Dedi Kurniawan