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All Journal KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia Berkala Ilmiah Kimia Farmasi Jurnal Redoks : Jurnal Pendidikan Kimia dan Ilmu Kimia Prosiding Temu Ilmiah Nasional Guru Jurnal Bakti Nusantara Nexus
Rahmat, Nahzim
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Other

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UPAYA MENINGKATKAN HASIL BELAJAR SISWA MENGGUNAKAN METODE PEMBELAJARAN DISCOVERY LEARNING DENGAN MATERI SISTEM KOLOID SISWA KELAS XI Nugrohaini, Fitri; Suyana, Iyon; Rahmat, Nahzim; Wijayanti, Sukma Wahyu
Prosiding Temu Ilmiah Nasional Guru Vol. 15 No. 1 (2023): TING XV 2023
Publisher : Fakultas Keguruan dan Ilmu Pendidikan (FKIP), Universitas Terbuka

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Abstract

The problem discussed in this study is how to improve learning outcomes and student learning activities using the discovery learning method with colloidal system material for class XI MIPA SMA IT Istiqomah Temanggung. This study aims to improve the learning outcomes and learning activities of XI MIPA SMA IT Istiqomah Temanggung students about colloidal system material using discovery learning methods. The research data were obtained from 18 students in class XI MIPA SMA IT Istiqomah Temanggung. When the research was conducted in semester 2 of the 2022/2023 school year. This classroom action research was conducted for 2 cycles. The collection of material understanding data was measured by understanding tests and student learning activities were measured by observing student learning activities. Data analysis was grouped based on data on students who were able to achieve KKM on student learning outcomes and learning activities. The Minimum Completeness Criteria (KKM) for chemistry subject class XI is 70. The learning outcomes of students in cycle 1 who achieved KKM were 7 students (39%). In cycle 2 there was an increase in student learning outcomes to 15 students (83%) who achieved KKM. Student learning activities consist of 3 aspects, namely the aspect of discussion ability, learning interaction and presenting the results of the discussion. From the observations of student learning activities in cycle 1, there were 7 students (39%) who achieved KKM scores. In cycle 2 student learning activities increased to 18 students (100%) who achieved KKM scores.
Uji Aktivitas Antioksidan Ekstrak Daun Temurui (Murraya koenigii L Spreng) Dengan Penentuan Kandungan Senyawa Aktif Menggunakan UPLC-MS Afandi, Trisno; Permata, Intania; Hariyanto Hariyanto; Rahmat, Nahzim; Nainggolan, Fernando
Berkala Ilmiah Kimia Farmasi Vol. 11 No. 2 (2024): December
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/bikfar.v11i2.63923

Abstract

People have historically utilized temurui leaves to treat diabetes and diarrhoea. This study aimed to determine the temurui leaf extract's antioxidant properties. Antioxidant activity was examined on methanol, ethyl acetate, and methanol extracts of temurui leaves using the FRAP (Ferric Reducing Antioxidant Power) and DPPH (2,2-diphenyl-1-picryhydrazyl) techniques spectrophotometrically at wavelengths of 720 and 517 nm, respectively. Antioxidant activity parameters were measured based on the IC50 value. The results showed that methanol, ethyl acetate, and n-hexane extracts of temurui leaves had relatively weak antioxidant activity with IC50 values of 179,745±4,26; 189,730±15,403; and 282,244±12,297 mg/L (DPPH method) and 287,305±19,054; 344,809±63,907; 505,065±32,567 mg/L (FRAP method), respectively. Therefore, methanol extract of temurui leaves has the potential as a better antioxidant than n-hexane and ethyl acetate extracts. The UPLC-QTof-MS/MS analysis indicated that the methanol extract of these leaves consists of 13 chemicals such as phenolic, steroid, and alkaloid groups which are closely related to its antioxidant properties.   Keywords:  Murraya koenigii L spreng, Antioxidant, DPPH, FRAP, UPLC-MS
Upaya Peningkatan Literasi Bahan Tambahan Pangan dalam Jajanan Kemasan melalui Sosialisasi Interaktif Hasibuan, Adelia Yesya Putri; Moneteringtyas, Prisca Caesa; Tarigan, Ayu Syufiatun Br; Rahmat, Nahzim
Jurnal Bakti Nusantara Vol. 2 No. 3 (2025): Jurnal Bakti Nusantara
Publisher : Pustaka Media Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63763/jbn.v2i3.92

Abstract

Rendahnya kesadaran masyarakat terhadap bahan tambahan pangan dan zat kimia dalam jajanan kemasan dapat menimbulkan risiko kesehatan, khususnya di kalangan anak-anak dan orang tua di wilayah pedesaan. Program pengabdian kepada masyarakat ini bertujuan untuk meningkatkan literasi kimia pangan melalui kegiatan sosialisasi edukatif yang interaktif. Kegiatan ini dilaksanakan di Desa Bagan Serdang, Kecamatan Pantai Labu, Kabupaten Deli Serdang, Provinsi Sumatera Utara. Dengan menggunakan pendekatan riset tindakan, dilakukan tes awal dan tes akhir untuk mengevaluasi efektivitas intervensi. Hasil evaluasi menunjukkan adanya peningkatan signifikan dalam tingkat pengetahuan peserta, di mana hampir seluruh peserta memperoleh skor tertinggi pada tes akhir. Tingkat pemahaman tinggi dapat dilihat pada tes akhir yang mencapai 100% yaitu terdapat pada soal nomor 1, 2, 4, 5, 7, dan 9, sedangkan yang tidak mencapai 100%, hanya terdapat pada soal nomor 3 (86,70%), nomor 6 (73,33%), nomor 8 (80%), dan nomor 10 (93,30%). Sosialisasi interaktif telah berhasil meningkatkan pemahaman mitra tentang bahan tambahan pangan dalam jajanan kemasan.
Pengaruh Penambahan KOH Terhadap Kulit Kerang (Anadara granosa) Sebagai Katalis Dalam Pembuatan Biodiesel Afandi, Trisno; Nurhayati; Awaluddin, Amir; Nainggolan, Fernando; Rahmat, Nahzim
KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia Vol 8 No 2 (2025): Jurnal Katalis Vo.8 No.2 Tahun 2025
Publisher : Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/katalis.v8i2.13377

Abstract

The utilization of waste as a source of catalytic material in biodiesel production continues to be developed, including waste from cockle shells. In this study, the addition of KOH to the suspension of calcined cockle shells was carried out to increase the catalyst activity in biodiesel production through the transesterification reaction. The catalyst was prepared through the following stages: 1) calcination of cockle shells at 900°C for 10 hours, 2) addition of KOH to the suspension of calcined cockle shells with varying K percentages of 1%; 3%; and 5%, then the mixture was calcined at 600°C. The formed catalyst contains the minerals portlandite (Ca(OH)2) and calcite (CaCO3) based on the X-Ray Diffraction test. The addition of KOH to the suspension of calcined cockle shells was successfully carried out through the K content test using Atomic Absorption Spectroscopy. The K concentration measurement data increased along with the increase in the amount of K added, respectively at 0% K of 2381 ppm, 1% K of 2425 ppm, 3% K of 3183 ppm, and 5% K of 3800 ppm. The basicity of the catalyst was measured by titration using benzoic acid with the result of increasing basicity after the addition of KOH, each basicity of the catalyst 0% K was 1.700 mmol benzoic acid/g, 1% K was 1.700 mmol benzoic acid/g, 3% K was 1.865 mmol benzoic acid/g, and 5% K was 1.965 mmol benzoic acid/g. The catalyst activity test data in biodiesel production showed an increase in the percentage of biodiesel yield, respectively at 0% K of 56.17%, 1% K of 57.72%, 3% K of 76.33%, and 5% K of 76.85%. The catalyst activity also increased based on the measurement data of methyl ester content in biodiesel using Gas Chromatography, respectively at 0% K of 96.42%, 1% K of 97.5%, 3% K of 98.36%, and 5% K of 97.79%. The results show that the catalyst has the potential to be developed and applied in the biodiesel industry as an environmentally friendly catalytic material.
Pengaruh Variasi Rasio Prekursor terhadap Kristalinitas Nanopartikel ZnO Hasil Sintesis Hijau Berbasis Ekstrak Parthenium hysterophorus L. Rahmat, Nahzim; Caesa Moneteringtyas, Prisca; Budiarti Pratiwi, Pina; Afandi, Trisno
JURNAL REDOKS : JURNAL PENDIDIKAN KIMIA DAN ILMU KIMIA Vol 9 No 1 (2026): Jurnal Redoks : Jurnal Pendidikan Kimia dan Ilmu Kimia
Publisher : Program Studi Pendidikan Kimia STKIP Bima

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33627/re.v9i1.4067

Abstract

This study aims to synthesize ZnO nanoparticles via a green synthesis approach using Parthenium hysterophorus L. leaf extract with two variations of precursor ratios. The process was carried out at a temperature range of 65–85 °C followed by calcination at 600 °C for 2 hours. FTIR analysis showed a strong absorption band at 840 cm⁻¹ corresponding to Zn–O stretching vibrations, along with several organic functional groups (C–O, C=O, C=C) acting as natural stabilizing agents. XRD patterns confirmed the formation of the wurtzite ZnO phase without impurities, with crystallite sizes calculated by the Scherrer equation of 0.87 nm (Sample A) and 0.94 nm (Sample B). The sharper peaks observed in Sample B indicate higher crystallinity. These findings demonstrate the effectiveness of P. hysterophorus L. extract as a natural bioreductant in the eco-friendly synthesis of ZnO nanoparticles
Studi Komparatif Pengaruh Jenis Pelarut terhadap Pembentukan dan Karakteristik Nanopartikel ZnO Berbasis Ekstrak Daun Parthenium hysterophorus L. Rahmat, Nahzim; Moneteringtyas, Prisca Caesa; Pratiwi, Pina Budiarti
Nexus Sains dan Teknologi Vol. 1 No. 2 (2025): Nexus: Jurnal Sains dan Teknologi
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/nst.v1i2.2885

Abstract

Penelitian ini bertujuan untuk menyelidiki pengaruh jenis pelarut terhadap karakteristik nanopartikel ZnO yang disintesis menggunakan ekstrak daun Parthenium hysterophorus L. sebagai agen pereduksi alami. Ekstrak daun direndam dengan dua pelarut yaitu metanol atau aquabides selama 24 jam dan digunakan sebagai agen pereduksi dalam sintesis ZnO. Endapan yang dihasilkan dikeringkan, dikalsinasi pada 600 °C, dan dikarakterisasi menggunakan FTIR serta XRD. Hasil analisis FTIR menunjukkan adanya pita serapan O–H pada 3318 cm⁻¹ pada sampel B yang tidak muncul pada sampel A. Hal ini mengindikasikan bahwa keberadaan gugus hidroksil sisa yang lebih dominan pada sintesis berbasis air. Sementara itu, hasil XRD mengonfirmasi bahwa kedua sampel memiliki struktur kristal ZnO heksagonal tipe wurtzite (JCPDS No. 36-1451) dengan puncak utama pada 2θ sekitar 31,7°, 34,4°, dan 36,3°. Ukuran kristalit yang dihitung menggunakan persamaan Scherrer menunjukkan nilai rata-rata sekitar 41 nm untuk sampel A dan 28 nm untuk sampel B. Hasil ini menunjukkan bahwa metanol menghasilkan kristal ZnO yang lebih besar, sedangkan air menghasilkan kristalit lebih kecil dengan strain kisi lebih tinggi.
Co-Authors Afandi, Trisno Amir Awaluddin Ayu Syufiatun Tarigan Budiarti Pratiwi, Pina Caesa Moneteringtyas, Prisca Hariyanto Hasibuan, Adelia Yesya Putri Iyon Suyana Nainggolan, Fernando Nugrohaini, Fitri Nurhayati Permata, Intania Pratiwi, Pina Budiarti Prisca Caesa Moneteringtyas Wijayanti, Sukma Wahyu