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All Journal CHEESA: Chemical Engineering Research Articles Journal of Indonesian Primary School
Sari, Heni Puspita
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Chemical Engineering, Chemistry & Bioengineering Chemistry Education

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Synthesis and Characterization of SCDs/TiO2 Composite Aritonang, Anthoni Batahan; Sapar, Ajuk; Sari, Heni Puspita; Ardiningsih, Puji; Adhitiyawarman, Adhitiyawarman
CHEESA: Chemical Engineering Research Articles Vol. 5 No. 2 (2022)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v5i2.13915.92-100

Abstract

Synthesis of sulphur-doped carbon nanodots immobilized on the TiO2 surface (SCDs/TiO2) composite was carried out using the sol-gel method with SCDs and titanium tetraisopropoxide (TTIP) as precursors. SCDs were prepared from citric acid monohydrate, urea, and sodium disulphite using the microwave technique. SCDs/TiO2 was then visually observed under UV 365 nm and characterized by UV-Vis diffuse reflectance spectrophotometry (UV-Vis/DRS), Photoluminescence (PL) spectroscopy, Fourier transform infrared (FT-IR), and X-ray diffraction (XRD). The SCDs/TiO2 composite product had a brown solid with a green luminescent under UV light. Furthermore, UV-Vis/DRS for variations in SCDs concentrations of 0.5%; 1.25%, and 2.5% showed Eg values of 2.33 eV, 2.14 eV, and 1.61 eV, respectively. The results showed that SCDs caused the maximum emission peak (λEm) to redshift and also affected the intensity of PL TiO2. There was also a shift in the absorption peak towards the visible light region. Based on the results, the 0.5% SCDs/TiO2 was the optimum concentration with the lowest intensity as an indication of separation of the (e-) and (h+) charge pairs, which greatly enhanced the photocatalytic efficiency.
Efforts to Improve Children's Fine Motor Skills through Sewing Activities at Raudhatul Athfal 'Aisyiyah Gontor Sari, Heni Puspita; Sa'diah, Kalimatu
Journal of Indonesian Primary School Vol. 2 No. 1 (2025): MARCH 2025
Publisher : MANDAILING GLOBAL EDUKASIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62945/jips.v2i1.431

Abstract

Children, especially early childhood, are the most optimal period for development. For children, motor development greatly influences other aspects of development. Therefore, researchers took steps to improve children's fine motor skills through sewing activities. The purpose of this improvement is to improve children's fine motor skills through sewing activities in group B at RA 'Aisyiyah Gontor Mlarak Ponorogo in the 2022/2023 academic year. This research was conducted at Raudhatul Athfal 'Aisyiyah Gontor in the 2022/2023 academic year with 20 students. The implementation of this research used 2 cycles. Each cycle 5 RPPH (5 meetings). In cycle II, the aspects assessed experienced an increase. Through sewing activities, the results obtained increased in children's sewing abilities, namely in cycle I, children who had one star were 20%, children who had two stars 65%, children who had three stars 15%, children who had four stars 0%. In cycle II, children who have one star are 0%, children who have two stars are 15%, children who have three stars are 70%, children who have four stars are 15%. Thus, this research experienced an increase in cycle II.
Co-Authors Adhitiyawarman, Adhitiyawarman Ajuk Sapar Aritonang, Anthoni Batahan Puji Ardiningsih Sa'diah, Kalimatu