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Pengaruh pH dan Tegangan Listrik dalam Elektrolisis Limbah Padat Baja (Slag Eaf) Sebagai Upaya Mereduksi Kandungan Logam Fe pada Limbah Padat Industri Galvanis Abdul Aziz; Wirda Udaibah; Malikhatul Hidayah
Walisongo Journal of Chemistry Vol 1, No 2 (2018): 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.v2i2.3102

Galvanization is a metal coating process that is widely used in industry. The effects of this metal coating process are not entirely beneficial to society. The issue of pollution generated by the metal coating activity becomes very important. The objective of this research is to reduce Fe metal content from solid waste steel using electrolysis process with variation of pH of electrolyte solution and voltage. This research uses experimental method with test of metal content composition using X-Ray Flouresence, and Fe metal reduction using electrolysis process. This research activity used stainless steel plate as cathode and solid steel waste chunk as anode. Variations of pH of FeSO4.7H2O electrolyte solution used during electrolysis process are pH = 2, pH = 2.5, pH = 3, pH = 3.5 and pH = 4. Variation of electric voltage used is 3 volts, 6 volts, 9 volts and 12 volts. The result of purity level analysis of the initial Fe metal at anode was 84,48 %, while after electrolysis process there was an increase of metal purity attached to the cathode of 96,58 %. The result showed that the effect of pH variation of the electrolyte solution on the mass produced in the electrolysis process in the A1, A2, A3, A4 and A5 samples was 0,09; 0,07; 0,02; 0,02; and 0,02 g. The greater the concentration of H+ of the electrolyte solution the more mass produced. In variable voltage of electricity on samples A11, A21, and A31 mass produced that is equal to 0,14; 0,13; and 0,10 g. While the mass of A41 sample did not increase in the cathode produced during the electrolysis process. The greater the voltage used in the electrolysis process the greater the mass produced.

PENGEMBANGAN MEDIA PEMBELAJARAN “PETUAH KIMIA” (KOMIK DIGITAL MATERI IKATAN KIMIA) Binti Mutammimah; Wirda Udaibah
Jurnal Tadris Kimiya Vol 7, No 1 (2022)
Publisher : Department of Chemistry Education, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jtk.v7i1.17426

The Indonesian children's literacy is still relatively low, and it has become a severe problem that the government, teachers, parents, and librarians should face. The data shows that only 10% of Indonesian children like to read a book, while most chemistry material is written in textbooks. This study aims to produce digital comics with chemical bonding material, determine comics' feasibility, and respond to readers. The research method develops the Borg and Gall model with seven stages of development without compromising the essence of the model. Meanwhile, data collection techniques are interviews, validation, and questionnaires using a Likert scale. The media and material validator has validated the product developed in this study. As a result, the media aspect has an overall score of 48 or 100%; the score belongs to the very decent criteria. The material aspect has got a score of 26 or 93% from the basic chemistry lecturers; Also, the chemistry teachers give 100%. In addition, the digital comic readers have an extensive test. Conversely, 48 respondents have been assessed with an overall score of 2753 or 90%. Hence, this percentage value relates to the very feasible category. Thus, the characteristics of this digital comic have fulfilled the material, media, language, and visual aspects; since it is included in the worthy category as an independent learning medium without replacing the role of educators.

Development of E-Module Chemistry oriented Disaster Mitigation of Elemental Chemicals Septya Nur Afijah; Apriliana Drastisianti; Wirda Udaibah
Social, Humanities, and Educational Studies (SHES): Conference Series Vol 6, No 4 (2023): Social, Humanities, and Educational Studies (SHEs): Conference Series
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/shes.v6i4.81292

Mitigasi bencana dapat dilakukan secara non struktural untuk meningkatkan kemampuan menghadapi bencana melalui media pembelajaran berorientasi mitigasi bencana. Tujuan penelitian ini adalah untuk mengetahui karakteristik dan kualitas produk serta respon siswa. Penelitian ini merupakan penelitian R&D dengan menggunakan model DBR (Design Based Research) dari Reeves yaitu analisis masalah, pengembangan solusi, proses berulang uji coba solusi, dan refleksi. Produk yang dikembangkan mempunyai karakteristik berupa materi kebencanaan tanah longsor dan terintegrasi dengan mata pelajaran kimia dikemas dalam bentuk e-modul. Produk yang dikembangkan layak digunakan dengan skor rata-rata aspek validasi ahli materi 0,83 (sangat valid), skor rata-rata aspek validasi ahli media 0,78 (valid), dan hasil respon siswa mendapatkan persentase 83,31% (baik). E-modul kimia berorientasi mitigasi bencana materi kimia unsur dapat digunakan oleh siswa untuk menunjang pembelajaran daring dan upaya mitigasi bencana secara non struktural.

Effect of ultrasound-advanced oxidation processes for pretreatment of oil palm mesocarp fiber for cellulose extraction Anggoro, Didi Dwi; Prasetyaningrum, Aji; Udaibah, Wirda; Imtinan, Alifa Bakhitah; Nabilah, Farhanah; Le Monde, Brilliant Umara
International Journal of Renewable Energy Development Vol 13, No 3 (2024): May 2024
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2024.60027

Palm mesocarp fiber, a by-product of the palm oil industry, holds significant potential as a cellulose source for biofuel, biopolymer, and biocomposite production. However, its utilization is hampered due to the presence of lignin, which covers the cellulose. The use of ozone promotes a high level of lignin degradation, making it efficient in breaking down lignin bonds in lignocellulose. However, the ozonation method has low ozone mass transfer. This deficiency can be overcome with ultrasonic waves because of the cavitation phenomenon that can expand the contact surface of ozone and lignocellulose. The ozonation-ultrasonic hybrid method is used to remove lignin. This research investigates the use of a hybrid ozonation-ultrasonic method with the effect of reaction time and pH under acidic conditions on the pretreatment of palm oil mesocarp fiber. This process was carried out at reaction times (70, 80, and 90 minutes) and solution pH (4, 5, and 6) with an ozone flow rate of 2 L min-1. The cellulose content was analyzed using the Chesson method. The results showed a decrease in lignin and an increase in cellulose, which was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) analysis shows a decrease in the lignin absorption peak at 1635 cm-1 and 1420 cm-1. XRD analysis showed an increase in crystallinity after pretreatment, with lignin degradation observed at 6.35%. SEM Morphological showed a more friable, stable, and porous surface after pretreatment, indicating the presence of perforations in the cell walls and the damage to the lignin structure. Therefore, this research succeeded in reducing the use of chemicals in the biomass waste delignification process. The ozonation-ultrasonic hybrid pretreatment process, which aims to degrade lignin in palm fiber biomass, shows promising results, producing high cellulose content in palm fiber by reducing the amount of chemicals as mostly used in conventional processes.

Synthesis of Fe₃O₄-Zno-Bentonite Composite and Their Activities in Photodegradation of Methylene Blue Amanah, Siti Nazilatul; Udaibah, Wirda; Kholidah, Kholidah
Walisongo Journal of Chemistry Vol. 7 No. 2 (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.v7i2.24018

The development of Fe₃O₄-ZnO-Bentonite photocatalyst material is crucial for the treatment of dye effluents, particularly in response to the rapid growth of the textile industry. Methylene blue, widely used as a textile dye, poses environmental challenges. The combination of bentonite, ZnO, and Fe₃O₄ was synthesized using the coprecipitation method to create a material capable of photodegrading methylene blue dye. Fe₃O₄-ZnO-Bentonite was synthesized using 2 g of bentonite, 8.19 g of Zn(NO₃)₂·6H₂O, and FeSO₄:FeCl₃ weight ratios (in grams) of 4.170:4.055 (composite 1), 4.170:8.109 (composite 2), and 4.170:12.164 (composite 3). Characterization of the photocatalyst materials was conducted using X-ray diffraction (XRD), ultraviolet diffuse reflectance spectroscopy (UV-DRS), and scanning electron microscopy-energy dispersive X-ray (SEM-EDX) mapping. The Fe₃O₄-ZnO-Bentonite composite exhibited a crystalline structure, with band gap values of 2.94 eV (composite 1), 2.07 eV (composite 2), and 2.20 eV (composite 3). The morphology of the material was characterized by small and irregularly shaped chunks. Elemental analysis detected Fe, Zn, and Si peaks, confirming the even distribution of Fe₃O₄ and ZnO within the bentonite matrix. The synthesized Fe₃O₄-ZnO-Bentonite composite demonstrated enhanced photodegradation activity for methylene blue compared to the starting materials. Composite 3 exhibited the highest photocatalytic activity, achieving a degradation efficiency of 96.02% at a methylene blue concentration of 20 ppm (pH 9) within 60 minutes.

Synthesis of Fe₃O₄-Zno-Bentonite Composite and Their Activities in Photodegradation of Methylene Blue Amanah, Siti Nazilatul; Udaibah, Wirda; Kholidah, Kholidah
Walisongo Journal of Chemistry Vol. 7 No. 2 (2024): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v7i2.24018

The development of Fe₃O₄-ZnO-Bentonite photocatalyst material is crucial for the treatment of dye effluents, particularly in response to the rapid growth of the textile industry. Methylene blue, widely used as a textile dye, poses environmental challenges. The combination of bentonite, ZnO, and Fe₃O₄ was synthesized using the coprecipitation method to create a material capable of photodegrading methylene blue dye. Fe₃O₄-ZnO-Bentonite was synthesized using 2 g of bentonite, 8.19 g of Zn(NO₃)₂·6H₂O, and FeSO₄:FeCl₃ weight ratios (in grams) of 4.170:4.055 (composite 1), 4.170:8.109 (composite 2), and 4.170:12.164 (composite 3). Characterization of the photocatalyst materials was conducted using X-ray diffraction (XRD), ultraviolet diffuse reflectance spectroscopy (UV-DRS), and scanning electron microscopy-energy dispersive X-ray (SEM-EDX) mapping. The Fe₃O₄-ZnO-Bentonite composite exhibited a crystalline structure, with band gap values of 2.94 eV (composite 1), 2.07 eV (composite 2), and 2.20 eV (composite 3). The morphology of the material was characterized by small and irregularly shaped chunks. Elemental analysis detected Fe, Zn, and Si peaks, confirming the even distribution of Fe₃O₄ and ZnO within the bentonite matrix. The synthesized Fe₃O₄-ZnO-Bentonite composite demonstrated enhanced photodegradation activity for methylene blue compared to the starting materials. Composite 3 exhibited the highest photocatalytic activity, achieving a degradation efficiency of 96.02% at a methylene blue concentration of 20 ppm (pH 9) within 60 minutes.

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