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All Journal Pendas : Jurnah Ilmiah Pendidikan Dasar Jurnal Sains dan Teknologi Reaksi
Lesy Ayunda
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Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Materials Science & Nanotechnology Other

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ADSORPSI LOGAM Cd2+ MENGGUNAKAN BIOADSORBEN BERBASIS KOMPOSIT FILM KITOSAN-LIMBAH CANGKANG KOPI Lesy Ayunda; Nurmala Nurmala; Al Dhita Ramadhana; Satriananda Satriananda
Jurnal Sains dan Teknologi Reaksi Vol 17, No 2 (2019): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v17i2.1487

Abstract

Pemanfaatan limbah sebagai bioadsorben alternatif untuk mengurangi tingkat pencemaran logam berat Cd2+ pada penelitian ini,dilakukan melalui proses sintesis komposit film dari kitosan (Ks) dan limbah cangkang kopi (LCK). Bertujuan untuk mendapatkan pengaruh penambahan LCK dan variasi waktu adsorpsi terhadap efesiensi penyisihan ion logam Cd2+. Adsorpsi ion logam Cd2+ dilakukan dengan variasi penambahan LCK 0, 5 dan 10%  (%b) serta variasi waktu 0, 30, 60, 90 dan 120 menit. Hasil adsorpsi dianalisa konsentrasinya menggunakan spekrofotometer serapan atom (AAS). Secara keseluruhan hasil menunjukkan peningkatan efesiensi penyerapan yang baik oleh komposit Ks-LCK10% pada waktu kontak 120 menit sebesar 92,26 % dengan konsentrasiakhir0.77 mg/L.Sehingga disimpulkan bahwa komposit film Ks-LCK pada penelitian ini dapat digunakan sebagai adsorben ramah lingkungan untuk menurunkan kadar ion logam Cd2+ dalam air.
PENINGKATAN KEMANDIRIAN ANAK MELALUI KEGIATAN BERMAIN BALOK Henny Murdhiana; Aulia Ardhana Rizka Nadine; Mustatiroh Nur Rahma Fitriyani; Lesy Ayunda; Ratna Wahyu Pusari
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 2 (2026): Volume 11 No. 02, Juni 2026.
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i2.49766

Abstract

This study aims to enhance the independence of children aged 3–4 years through block play activities at the Hj Maryam Kalibeber Nursery School in Wonosobo. The study was motivated by the children’s low level of independence, evident in their behaviour—namely, their continued reliance on teachers’ assistance, lack of self-confidence, and inability to complete tasks independently. The study employed the Classroom Action Research (CAR) method, conducted over two cycles with a sample of 16 children aged 3–4 years. Data collection techniques included observation, interviews, and documentation. The data were analysed using both qualitative and quantitative descriptive methods. The results indicated that block play activities significantly enhanced the children’s independence. In the pre-cycle, 0% of children achieved the ‘Very Good Development’ (VGD) category; this increased to 25% in Cycle I and reached 87.5% in Cycle II. Improvements were observed in children’s ability to make decisions, their self-confidence, sense of responsibility, ability to complete tasks independently, and ability to cooperate with peers. Thus, block play activities are effective as a learning strategy for enhancing social-emotional development, particularly the independence of young children.  
Co-Authors Al Dhita Ramadhana Aulia Ardhana Rizka Nadine Henny Murdhiana Mustatiroh Nur Rahma Fitriyani Nurmala Nurmala Nurmala Nurmala Ratna Wahyu Pusari . . Satriananda Satriananda