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All Journal Indonesian Journal of Chemistry Jumat Pendidikan: Jurnal Pengabdian Masyarakat Indonesian Journal of Chemistry and Environment al Kimiya : Jurnal Ilmu Kimia dan Terapan
Isti Yunita
Department Of Chemistry Education, Faculty Of Mathematics And Natural Sciences, Universitas Negeri Yogyakarta
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Education Materials Science & Nanotechnology Social Sciences Other

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Preparation, Electronic Properties, and Powder-XRD Structure Analysis of 3,5-Bis(pyridin-2-yl)-H-1,2,4-triazoledichloridocopper(II) Kristian Handoyo Sugiyarto; Isti Yunita; Harold Andrew Goodwin
Indonesian Journal of Chemistry Vol 20, No 6 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.55600

Abstract

Salt of [Cu(bptrzH)Cl2], (bptrzH = 3,5-bis(pyridin-2-yl)-H-1,2,4-triazole) has been prepared and characterized its electronic spectral and magnetic properties. This salt is paramagnetic with magnetic moment, μs, being 1.77–1.78 BM at 293 K, but decreased significantly with decreasing temperature to be 0.60–0.63 BM at 90 K, indicating antiferromagnetic nature. This is associated with Cu–Cu magnetic interactions at low temperatures, and suggests that the salt adopt an octahedrally polymeric structure. The electronic spectrum of this salt reveals a strong ligand field band centered at about 13,000 cm–1 and a very strong charge transfer absorption at about 23,000–24,000 cm–1. The spectrum is better resolved at lower temperature and this is parallel to the slight change in color from yellowish-green at room temperature to bright green at low temperature (90 K). The powder XRD of this complex was refined by Le Bail method of Rietica program and found to be fit as triclinic symmetry of space group PĪ with the figure of merit: Rp = 5.02; Rwp = 7.95; Rexp = 5.40; Bragg R-Factor = 0.05; and GOF = 2.166.
Synthesis of Natural Zeolite/ZnO and its photodegradation activity on congo red M. Pranjoto Utomo; A. K. Prodjosantoso; Kun Sri Budiasih; Isti Yunita; Tisia Miftakhul Triani; Vera Dwi Nur Rahmawati
Indonesian Journal of Chemistry and Environment Vol 6, No 2 (2023): DECEMBER 2023
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v6i2.68334

Abstract

Dyes are the most common compound used in the textile industry. Dyes consisted of azo compound that is difficult to be degraded. Undegradated azo compound, such as congo red, danger for the environment. An alternative effort to handle congo red waste must be conducted. Natural zeolite/ZnO is a material that can be used to degrade congo red to be simpler compound. Based on the analysis, the characters of natural zeolite/ZnO are hexagonal wurtzite structure, particle size 24.264 nm, band gap energy 2.96 eV. The highest degradation percentage in photodegradation activity of natural zeolite/ZnO on congo red is 99.41%.
Silica Modified Natural Dye of Caesalpinnia sappan l. on Cotton Fabrics Kun Sri Budiasih; Eli Rohaeti; Isti Yunita; Azlan Kamari
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 10, No 1 (2023): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v10i1.24578

Abstract

Sappana (Caesalpinnia sappan L.) has been known as a natural dye in textiles and food. This research aimed to develop a sappan-based natural dye for fabrics dyeing by SiO2 modification as the UV protection agent. The sappan dye and its color were measured by colorimetric methods on UV-Vis spectrophotometry. The testing of the material includes a standard color detection test on the solution and washing resistance on cotton fabrics. The product is the prototype of a stable natural dye product of SiO2 modified - sappan (Si-Cs) which will be performed consistently on cotton fabrics. The result showed that SiO2-modified sappan dye had a higher absorbance in UV-Vis Spectrometer. The performance of the coloring product was also better than the standard sappan dye, indicated by the higher Ultraviolet Protection Factor and the fastness value. Variations of coloring products affected by the mordant agents varied from orange-red-purple caused by non-mordant–alum acetate and iron mordant respectively.
Pengenalan Persepsi Dasar Kimia pada Anak melalui Eksperimen Sains Menarik sebagai Upaya Penanggulangan Chemophobia Isti Yunita; Dina Dina; Kun Sri Budiasih; Cahyorini Kusumawardani
Jumat Pendidikan: Jurnal Pengabdian Masyarakat Vol. 5 No. 2 (2024): Agustus
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat UNWAHA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32764/abdimaspen.v5i2.4173

Abstract

Pengabdian kali ini bertujuan untuk mengenalkan persepsi dasar kimia pada anak melalui eksperimen sains menarik untuk menanggulangi chemophobia. Sejumlah 30 peserta kegiatan dari MDT. Ngudi Luhur menjadi khalayak sasaran. Kegiatan disampaikan dalam dua kali pertemuan, teori dan praktik. Eksperimen kimia menarik dipilih sebagai kegiatan untuk memperkuat teori yang telah disampaikan di pertemuan sebelumnya. Eksperimen kimia menarik yang dilakukan yaitu ikan berenang, pelangi di piring, the menjadi air putih, meniup balon, lava lamp, dan pesan rahasia. Instrumen yang digunakan yaitu lembar need assessment, lembar observasi keaktifan peserta, lembar observasi unjuk kerja, kumpulan pertanyaan untuk game cerdas cermat, serta lembar angket evaluasi kegiatan. Kegiatan mencapai indikator keberhasilan ditandai dengan 81,67% peserta terlibat aktif serta 100% peserta mengikuti demonstrasi dengan baik. Keberhasilan kegiatan pengabdian menjadi salah satu kontribusi tim pengabdi dalam mengatasi kesalahan persepsi terhadap kimia yang berkembang di masyarakat yang akan lebih dirasakan manfaatnya jika diberikan sejak usia anak.
Co-Authors A.K Prodjosantoso A.K Prodjosantoso Azlan Kamari Cahyorini Kusumawardani Dina Dina Eli Rohaeti Harold Andrew Goodwin Kristian Handoyo Sugiyarto Kun Sri Budiasih M. Pranjoto Utomo Tisia Miftakhul Triani Vera Dwi Nur Rahmawati