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Uma Fadzilia Arifin, Uma Fadzilia
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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PENGEMBANGAN LEMBAR KERJA PRAKTIKUM SISWA TERINTEGRASI GUIDED INQUIRY UNTUK KETERAMPILAN PROSES SAINS Arifin, Uma Fadzilia; Hadisaputro, Subiyanto; Susilaningsih, Endang
Chemistry in Education Vol 4 No 1 (2015): Terbit Bulan April 2015
Publisher : Chemistry in Education

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Abstract

Penelitian ini merupakan penelitian pengembangan yang bertujuan untuk mengembangkan Lembar Kerja Praktikum Siswa (LKPS) terintegrasi guided inquiry untuk keterampilan proses sains siswa yang layak, efektif, praktis dan mendapat respon positif dari penggunanya. Desain penelitian yang digunakan yaitu Research and Development. Desain ini menggunakan Three-D Models yaitu Define, Design, and Develop. Pengumpulan data pada penelitian ini menggunakan metode observasi, wawancara, tes, angket dan dokumentasi. Data hasil penelitian dianalisis menggunakan metode analisis deskriptif kuantitatif. Secara kuantitatif, data hasil penelitian dianalisis dengan cara menghitung rerata skor dan menentukan kriteria pada interval kelas tertentu. Hasil analisis data tersebut menunjukkan bahwa LKPS memperoleh skor rerata validasi sebesar 76 sehinga dinyatakan layak secara teoretis. LKPS dinyatakan efektif karena 28 siswa mencapai nilai Kriteria Ketuntasan Minimal (KKM) pada hasil tes dan keterampilan proses sainsnya mendapat predikat baik. Selain itu, data angket menunjukkan bahwa LKPS dinyatakan praktis dan mendapat respon baik dari penggunanya. Berdasarkan hasil analisis data dapat disimpulkan bahwa LKPS terintegrasi guided inquiry untuk keterampilan proses sains dinyatakan layak, efektif, praktis dan mendapat respon positif dari penggunanya sehingga dapat diterapkan dalam pembelajaran kimia.
PENGEMBANGAN LEMBAR KERJA PRAKTIKUM SISWA TERINTEGRASI GUIDED INQUIRY UNTUK KETERAMPILAN PROSES SAINS Arifin, Uma Fadzilia; Hadisaputro, Subiyanto; Susilaningsih, Endang
Chemistry in Education Vol 4 No 1 (2015): Terbit bulan April 2015
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini merupakan penelitian pengembangan yang bertujuan untuk mengembangkan Lembar Kerja Praktikum Siswa (LKPS) terintegrasi guided inquiry untuk keterampilan proses sains siswa yang layak, efektif, praktis dan mendapat respon positif dari penggunanya. Desain penelitian yang digunakan yaitu Research and Development. Desain ini menggunakan Three-D Models yaitu Define, Design, and Develop. Pengumpulan data pada penelitian ini menggunakan metode observasi, wawancara, tes, angket dan dokumentasi. Data hasil penelitian dianalisis menggunakan metode analisis deskriptif kuantitatif. Secara kuantitatif, data hasil penelitian dianalisis dengan cara menghitung rerata skor dan menentukan kriteria pada interval kelas tertentu. Hasil analisis data tersebut menunjukkan bahwa LKPS memperoleh skor rerata validasi sebesar 76 sehinga dinyatakan layak secara teoretis. LKPS dinyatakan efektif karena 28 siswa mencapai nilai Kriteria Ketuntasan Minimal (KKM) pada hasil tes dan keterampilan proses sainsnya mendapat predikat baik. Selain itu, data angket menunjukkan bahwa LKPS dinyatakan praktis dan mendapat respon baik dari penggunanya. Berdasarkan hasil analisis data dapat disimpulkan bahwa LKPS terintegrasi guided inquiry untuk keterampilan proses sains dinyatakan layak, efektif, praktis dan mendapat respon positif dari penggunanya sehingga dapat diterapkan dalam pembelajaran kimia.
Optimization of Chromium (VI) Adsorption using Microalgae Biomass (Spirulina sp.) and its Application in Leather Tannery Waste Adetya, Nais Pinta; Arifin, Uma Fadzilia; Anggriyani, Emiliana; Rachmawati, Laili
CHEESA: Chemical Engineering Research Articles Vol. 6 No. 2 (2023)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v6i2.16315.105-117

Abstract

This study was conducted to examine the adsorption of Cr (VI) metal using Spirulina sp (inactive) biomass and its application in leather tannery wastewater. The treatment was carried out to determine the influence of independent variables on Cr (VI) adsorption with variations in pH, contact time, and metal solution concentration. The values of the solution pH, adsorption time, and concentration of the best metal solution were used to determine the center points of the optimization variables through Response Surface Methodology (RSM). The results showed that based on the FTIR test, macromolecules present in Spirulina sp biomass included amino, carboxylate, and hydroxy groups. The combination of factor variables that produced the optimum response was at pH 3.165, contact time of 66.58 minutes, and Cr (VI) metal ion solution concentration of 22.9 mg/L, resulting in a Cr (VI) adsorption efficiency of 69.66%. The adsorption pattern was included in the Freundlich adsorption isotherm, and the application of Spirulina sp biomass adsorbent to tannery waste reduced the concentration of Cr (VI) from 3.9 g/L to an undetectable level at <1.4 g/L.
PENGARUH PAPARAN MICROWAVE TERHADAP DERAJAT IKATAN SILANG PADA VULKANISASI KARET STIRENA BUTADIENA Saputra, Andri; Rahmawati, Atiqa; Arifin, Uma Fadzilia; Agustian, Mertza Fitra
Warta Perkaretan Vol. 43 No. 1 (2024): Volume 43, Nomor 1, Tahun 2024
Publisher : Pusat Penelitian Karet - PT. Riset Perkebunan Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/ppk.wp.v43i1.978

Abstract

Vulkanisasi karet diperlukan untuk meningkatkan sifat kekuatan dan elastisitas suatu produk karet. Selain mempersingkat waktu proses, kelebihan vulkanisasi menggunakan radiasi elektromagnetik dari microwave adalah panas yang seragam yang tidak tergantung pada ketebalan produk. Penelitian ini bertujuan mengetahui karakteristik vulkanisasi karet stirena butadiena pada berbagai waktu paparan radiasi microwave. Kompon karet stirena butadiena dimasukkan dalam microwave dan diberi paparan radiasi elektromagnetik menggunakan daya 5 W pada berbagai waktu (10, 30, 50, 60, dan 70 menit). Derajat ikatan silang vulkanisat diuji menggunakan metode Flory-Rehner. Hasil penelitian diketahui bahwa tahap induksi vulkanisasi karet stirena butadiena pada daya 100 W membutuhkan durasi paparan yang lama sekitar 50 menit dengan derajat ikatan silang sebesar 0,52x10-8 mol/cm3. Tren hasil menunjukkan bahwa lama paparan radiasi berbanding lurus dengan nilai derajat ikatan silang karet stirena butadiene. Derajat ikatan silang karet stirena butadiene pada waktu 50, 60, dan 70 menit secara berurutan adalah 0,52x10-8 mol/cm3, 4,65x10-8 mol/cm3, dan 29,41x10-8 mol/cm3. Paparan radiasi elektromagnetik dari microwave di atas menit ke-70 diperkirakan masih dapat menyebabkan terbentuknya ikatan silang antar karet stirena butadiene hingga titik maksimum pada menit tertentu.
Utilization Of Chlorella Pyrenoidosa As A Phytoremediator For Tannery Waste Adetya, Nais Pinta; Arifin, Uma Fadzilia; Anggriyani, Emiliana; Rachmawati, Laili
Walisongo Journal of Chemistry Vol 7, No 1 (2024): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v7i1.20749

Abstract

This study aims to analyze the effect of phytoremediation on the bioremoval of COD, ammonia, and Cr (VI) from tannery wastewater and examine its effect on the growth of Chlorella populations. The research method consisted of two stages: first, preparation of liquid waste media. The second is culturing pure cultures followed by microalgae cultivation using leather tanning liquid waste media with a concentration variation of 0%, 10%, 20%, and 30% v/v. Filtrate samples after harvest were analyzed for COD, ammonia, and Cr (VI). The results obtained in this study show that Chlorella can grow in tanning waste media. The highest exponential phase occurs at a concentration of 20% with a growth rate of 0.557. Tannery liquid waste contains inorganic minerals utilized by Chlorella pyrenoidosa cells for growth. Cultivation of Chlorella pyrenoidosa can reduce leather tanning liquid waste parameters, namely COD, ammonia, and Cr (VI).
Pengaruh Waktu Iradiasi Ultrasonik dengan Aktivasi Kalium Hidroksida terhadap Sifat Fisis Karbon Aktif dari Serbuk Karet End Life Tire Arifin, Uma Fadzilia; Adetya, Nais Pinta; Pambudi, Wisnu; Listyalina, Latifah; Ratnaningsih, Wahyu
Jurnal Teknik Kimia USU Vol. 13 No. 2 (2024): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v13i2.15549

Abstract

Processing End Life Tire (ELT) rubber powder into activated carbon is an alternative for handling tire waste. One way to improve physical properties such as proximate characteristics, surface area and pore diameter of activated carbon is through chemical activation assisted by ultrasonic irradiation. This research aims to determine the effect of ultrasonic irradiation time with potassium hydroxide (KOH) activation on the quality of ELT rubber activated carbon. Activated carbon was synthesized and activated using 30% KOH at various ultrasonic irradiation times, namely 0 minutes, 15 minutes, 30 minutes, 45 minutes and 60 minutes. Based on the characterization results, activated carbon with an ultrasonic irradiation time of 30 minutes is the active carbon that has the most superior properties. The proximate characteristics of activated carbon meet the active carbon quality requirements of SNI 06–3730–1995 and have the highest surface area, namely 401.11 m2/g and pore diameter of 2.1652 nm, which is included in the mesoporous structure category so that it has the potential to be applied as an adsorbent for heavy metals from contaminated fluid.
Pengaruh Waktu Iradiasi Ultrasonik dengan Aktivasi Kalium Hidroksida terhadap Sifat Fisis Karbon Aktif dari Serbuk Karet End Life Tire Arifin, Uma Fadzilia; Adetya, Nais Pinta; Pambudi, Wisnu; Listyalina, Latifah; Ratnaningsih, Wahyu
Jurnal Teknik Kimia USU Vol. 13 No. 2 (2024): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v13i2.15549

Abstract

Processing End Life Tire (ELT) rubber powder into activated carbon is an alternative for handling tire waste. One way to improve physical properties such as proximate characteristics, surface area and pore diameter of activated carbon is through chemical activation assisted by ultrasonic irradiation. This research aims to determine the effect of ultrasonic irradiation time with potassium hydroxide (KOH) activation on the quality of ELT rubber activated carbon. Activated carbon was synthesized and activated using 30% KOH at various ultrasonic irradiation times, namely 0 minutes, 15 minutes, 30 minutes, 45 minutes and 60 minutes. Based on the characterization results, activated carbon with an ultrasonic irradiation time of 30 minutes is the active carbon that has the most superior properties. The proximate characteristics of activated carbon meet the active carbon quality requirements of SNI 06–3730–1995 and have the highest surface area, namely 401.11 m2/g and pore diameter of 2.1652 nm, which is included in the mesoporous structure category so that it has the potential to be applied as an adsorbent for heavy metals from contaminated fluid.
The Application of Artificial Intelligence in Waste Classification as an Effort In Plastic Waste Management Listyalina, Latifah; Utami, Ratri Retno; Arifin, Uma Fadzilia; Putri, Naimah
Telematika Vol 21, No 1 (2024): Edisi Februari 2024
Publisher : Jurusan Informatika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/telematika.v21i1.11977

Abstract

Purpose: Sorting waste before it is deposited in the Final Disposal Site (TPA) is crucial to reduce the increasing amount of waste accumulation each year. This issue can be addressed by implementing machines capable of automatically sorting waste.Design/methodology/approach: This research is quantitative and utilizes secondary data, namely image data of various types of waste. The images will be classified into organic and inorganic waste using a deep learning model. The measurement conducted involves assessing the accuracy of the designed deep learning model in classifying waste images into appropriate categories.Fondings/results: Based on the available dataset, waste identification will be performed, including food waste, paper, wood, leaves, electronic waste, metal, plastic, and bottles. The overall accuracy of the model is 94.42%, indicating that the model correctly classifies 94.42% of waste samples.Originality/value/state of the art: This research can classify 8 types of waste classes successfully using deep learning.
Degradation rate of vitamin B6 on red chili pepper drying by blanching-brine-calcium pretreatment Arifin, Uma Fadzilia; Djaeni, Mohamad
Communications in Science and Technology Vol 2 No 2 (2017)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.2.2.2017.56

Abstract

Drying is one of the alternatives to prevent spoilage in red chili pepper by removing moisture content. Red chili pepper (Capsicum frutescens) has complex nutrition components such as vitamins and bioactive compound. However, vitamin B6 content in chili can degrade significantly in drying process by heat. This research studied degradation rate of vitamin B6 in chili drying process under various pretreatments and temperatures. In this study, post-harvest chili before dried was pretreated by blanching, osmotic dehydration with brine, immersing in calcium chloride solution and the combination of all them. They were dried in tray dyer at various temperatures 40°C, 50°C, 60°C and 70°C. Degradation of vitamin B6 content was analyzed every 2 hours by High-Performance Liquid Chromatography for 8 hours. Results showed that blanching-brine-calcium pretreatment was expected to reduce drying time and retain high content of vitamin B6 in red chili pepper. The degradation rate of vitamin B6 in chili followed second-order reaction. The degradation rate was influenced by temperature change referring to Arrhenius equation with activation energy was about 31.97 kJ/ mol K and constant rate (k0) was 3.769. Therefore, the vitamin B6 retention can be estimated at various pretreatments, times and temperatures. Furthermore, the favorable drying conditions can be evaluated.
Pelatihan Pemilahan Sampah Plastik di Bank Sampah Bareng Mukti BUMKal Sidomulyo Maju, Bambanglipuro, Bantul Saputra, Andri; Satwikanitya, Pani; Ellianto, Mario Sarisky Dwi; Arief, Diana Ross; Winursito, Isananto; Supomo, Supomo; Arifin, Uma Fadzilia; Wibowo, Midarto Dwi; Suwarno, Yuli; Utami, Ratri Retno
Jurnal Pengabdian Masyarakat AKA Vol 4, No 1 (2024): Juni 2024
Publisher : Politeknik AKA Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55075/jpm-aka.v4i1.235

Abstract

Sampah plastik di Kalurahan Sidomulyo, Bambanglipuro, Bantul belum dikelola dengan baik, sehingga menimbulkan penumpukan di Bank Sampah Bareng Mukti. Pengabdian kepada masyarakat ini bertujuan untuk mengedukasi masyarakat Kalurahan Sidomulyo terkait pemilahan sampah plastik. Pelatihan dilakukan dengan metode sosialisasi dan praktik kepada 16 peserta anggota Bank Sampah Bareng Mukti dan masyarakat Kalurahan Sidomulyo. Evaluasi pelatihan dilakukan dengan metode angket menggunakan kuesioner. Hasil pelatihan menunjukkan bahwa Peserta pelatihan mampu membedakan dan memiliah sampah plastik. Sampah plastik dipilah berdasarkan 7 jenis plastik. Penilaian terhadap pemahaman materi yang diberikan selama pelatihan menunjukkan peningkatan yang signifikan, dimana rata-rata nilai peserta meningkat dari 82,25 pada pre-test menjadi 96,06 pada post-test. Respons peserta terhadap materi dan instruktur sangat positif, dengan rata-rata penilaian keseluruhan mencapai 91,52, menunjukkan tingkat kualitas yang sangat baik. Evaluasi terhadap berbagai aspek pelatihan yang dilakukan oleh peserta juga mencerminkan hasil yang memuaskan, dengan rata-rata penilaian mencapai 4,21.
Co-Authors Adetya, Nais Pinta Agustian, Mertza Fitra Aningtyas, Vebri Arief, Diana Ross Emiliana Anggriyani Endang Susilaningsih Isananto Winursito, Isananto Laili Rachmawati Listyalina, Latifah M. Djaeni Mario Sarisky Dwi Ellianto Muhammad Amin Pambudi, Wisnu Prayogo, Wisnu Putri, Naimah Rahmawati, Atiqa Ratnaningsih, Wahyu Ratri Retno Utami RR. Ella Evrita Hestiandari Satwikanitya, Pani Shabrina, Husna Muizzati Subiyanto Hadisaputro, Subiyanto Suci Rahayu Supomo Supomo Suwarno, Yuli Wibowo, Midarto Dwi