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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 Aziz, Abdul; Udaibah, Wirda; Hidayah, Malikhatul
Walisongo Journal of Chemistry Vol 1, No 2 (2018): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology Walisongo

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 MODUL PEMBELAJARAN KIMIA BERORIENTASI ETNOSAINS DENGAN MENGANGKAT BUDAYA BATIK PEKALONGAN Lia, Roudloh Muna; Udaibah, Wirda; Mulyatun, Mulyatun
Unnes Science Education Journal Vol 5 No 3 (2016): December 2016
Publisher : Department of Integrated Science, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang in Collaboration with Perkumpulan Pendidikan IPA Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/usej.v5i3.13174

Abstrak ___________________________________________________________________ Penelitian didasari dengan belum dikaitkannya budaya batik (budaya khas Pekalongan) sebagai sumber belajar. Tujuan dari penelitian ini yaitu untuk menghasilkan modul pembelajaran kimia berorientasi etnosains batik pada materi larutan elektrolit dan non-elektrolit. Komposisi modul pembelajarannya disesuaikan pada karakteristik etnosains sehingga dihasilkan modul pembelajaran yang berkualitas. Subjek dari penelitian ini adalah peserta didik kelas X M.A. Salafiyah Simbang kulon Pekalongan. Penelitian menggunakan metode penelitian Research and Development. Hasil uji kelayakan modul pembelajaran kimia tahap I untuk keseluruhan nilai pakar sebesar 82.67% dengan kategori cukup valid. Hasil rata-rata keseluruhan nilai pakar pada validasi tahap II meningkat, yaitu sebesar 90% dan dinyatakan sangat valid. Modul pembelajaran kimia berorientasi etnosains mampu meningkatkan hasil belajar peserta didik dengan nilai n-gain 0.5 yaitu berada pada tingkat pencapaian sedang. Hasil ini menunjukkan bahwa modul yang dikembangkan efektif digunakan dalam pembelajaran. Abstract ___________________________________________________________________ The study is based on the culture of batik (the particular culture of Pekalongan) has not been included as a learning resource. The purpose of this study is to produce batik ethnoscience-oriented of chemical learning modules on material electrolyte and non-electrolyte solution. The composition of customized learning modules on the characteristics ethnoscience to produce quality learning modules. The subject of this research is the students of class X M.A. Salafiyah Simbangkulon Pekalongan. The study uses research methods Research and Development. The results of the feasibility test of chemistry learning modules of Phase I for overall value amounted to 82.67% of experts with fair valid category. The average yield of the overall value of experts in the validation phase II increased by 90% and declared very valid. Chemistry learning module that oriented ethnoscience could improve the students achievement with the score 0.5 n-gain that existed in the medium achievement. This result showed that the modules which developed are effective used in the learning.

PENGEMBANGAN MODUL PEMBELAJARAN KIMIA BERORIENTASI ETNOSAINS DENGAN MENGANGKAT BUDAYA BATIK PEKALONGAN Lia, Roudloh Muna; Udaibah, Wirda; Mulyatun, Mulyatun
Unnes Science Education Journal Vol 5 No 3 (2016): December 2016
Publisher : Department of Integrated Science, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang in Collaboration with Perkumpulan Pendidikan IPA Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/usej.v5i3.13174

Abstrak ___________________________________________________________________ Penelitian didasari dengan belum dikaitkannya budaya batik (budaya khas Pekalongan) sebagai sumber belajar. Tujuan dari penelitian ini yaitu untuk menghasilkan modul pembelajaran kimia berorientasi etnosains batik pada materi larutan elektrolit dan non-elektrolit. Komposisi modul pembelajarannya disesuaikan pada karakteristik etnosains sehingga dihasilkan modul pembelajaran yang berkualitas. Subjek dari penelitian ini adalah peserta didik kelas X M.A. Salafiyah Simbang kulon Pekalongan. Penelitian menggunakan metode penelitian Research and Development. Hasil uji kelayakan modul pembelajaran kimia tahap I untuk keseluruhan nilai pakar sebesar 82.67% dengan kategori cukup valid. Hasil rata-rata keseluruhan nilai pakar pada validasi tahap II meningkat, yaitu sebesar 90% dan dinyatakan sangat valid. Modul pembelajaran kimia berorientasi etnosains mampu meningkatkan hasil belajar peserta didik dengan nilai n-gain 0.5 yaitu berada pada tingkat pencapaian sedang. Hasil ini menunjukkan bahwa modul yang dikembangkan efektif digunakan dalam pembelajaran. Abstract ___________________________________________________________________ The study is based on the culture of batik (the particular culture of Pekalongan) has not been included as a learning resource. The purpose of this study is to produce batik ethnoscience-oriented of chemical learning modules on material electrolyte and non-electrolyte solution. The composition of customized learning modules on the characteristics ethnoscience to produce quality learning modules. The subject of this research is the students of class X M.A. Salafiyah Simbangkulon Pekalongan. The study uses research methods Research and Development. The results of the feasibility test of chemistry learning modules of Phase I for overall value amounted to 82.67% of experts with fair valid category. The average yield of the overall value of experts in the validation phase II increased by 90% and declared very valid. Chemistry learning module that oriented ethnoscience could improve the students achievement with the score 0.5 n-gain that existed in the medium achievement. This result showed that the modules which developed are effective used in the learning.

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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