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All Journal Journal of Natural Sciences and Mathematics Research Indonesian Journal of Chemical Science Walisongo Journal of Chemistry Cakrawala: Jurnal Studi Islam
Kustomo Kustomo
Jurusan Kimia, Fakultas Sains Dan Teknologi, Universitas Islam Negeri Walisongo, Semarang, Jawa Tengah 50185
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Materials Science & Nanotechnology Physics

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Uji Karakterisasi dan Mapping Magnetit Nanopartikel Terlapisi Asam Humat dengan Scanning-Electron-Microscope–Energy Dispersive X-Ray (SEM-EDX) Kustomo, Kustomo
Indonesian Journal of Chemical Science Vol 9 No 3 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i3.42172

Abstract

Scanning Electron Microscope (SEM) merupakan mikroskop electron dengan perbesaran tinggi yang mencitrakan permukaan material. Sedangkan Energy Dispersive X-Ray (EDX) adalah salah satu teknik untuk menentukan komposisi atom pada material, dasar dari analisis EDX adalah pelacakan dan pengukuran dari sifat-sifat sinar-X yang dibangkitkan oleh electron-elektron cepat. Sintesis magnetit nanopartikel terlapisi asam humat (Fe3O4–HA) dilakukan menggunakan metode kopresipitasi dengan perbandingan Fe2+ dan Fe3+ sebesar 1:2 mol. Uji karakterisasi pada material Fe3O4–HA dengan menggunakan SEM-EDX memberikan informasi bahwa terjadi pelapisan sempurna pada Fe3O4 oleh HA. Pada foto SEM Fe3O4-HA menunjukkan morfologi yang tidak teratur, yang menunjukkan telah terjadi interaksi ikatan antara Fe3O4 dan HA yang telah terkonfirmasi dengan data EDX dan mapping. Pada analisis EDX menunjukkan bukti bahwa terjadi penurunan jumlah Fe dari 23,54% (% atom) pada Fe3O4 sebelum pelapisan menjadi 7,86% (% atom) setelah pelapisan oleh HA, sedangkan unsur Karbon (C) dari HA memiliki jumlah persentase lebih besar dibandingkan dengan Fe dari Fe3O4, yaitu sebesar 37,62% (% atom). Hal ini membuktikan bahwa Fe3O4 telah berhasil terlapisi oleh HA, dan komposisi unsur terbanyak pada Fe3O4-HA ini adalah oksigen (O) yang merupakan sumbangan unsur O dari Fe3O4 dan HA yaitu sebesar 45,66% (% atom).
Synthesis of Hydrochar Cassava peels with hydrothermal carbonization method and applications as hard water softener Dzikria Sari Pratiwi; Wirda Udaibah; Kustomo Kustomo
Journal of Natural Sciences and Mathematics Research Vol 7, No 1 (2021): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jnsmr.2021.7.1.11283

Abstract

Groundwater before being used is very important to pay attention to the quality of the water. Water has good quality if it is in accordance with several parameters, including chemical, physical, and biological parameters. Mineral salt content is one of the chemical parameters that can be used to determine the quality of water. In this study, the synthesis of cassava peel hydrochar was successfully carried out using the hydrothermal carbonization (HTC) method. This material was developed to reduce waste of cassava peel biomass and overcome the problem of water hardness. HTC cassava peel was developed as an alternative hard water softener adsorbent. The results of FTIR characterization on hydro-activation (activating hydrochar) and hydro-non (non-activating hydrochar) contain functional groups of O-H stretch, C-H stretch, C≡C stretch and C=C stretch. Observation of surface morphology by SEM method on hydro-non in the form of large sheets, while the surface on hydro-activities in the form of small sheets. The adsorption capacity of hydro-active against Ca2+ ions and Mg2+ ions were 85.240 mg/g and 87.210 mg/g, respectively. Meanwhile, the hydro-non adsorption capacity of Ca2+ and Mg2+ ions were 84,736 mg/g and 85,713 mg/g. The kinetics of hydro-active adsorption on Mg2+ ion took place on order 3 (0.000003 min-1) while when adsorption of Ca2+ ion took place on order 0 (0.0324 min-1).©2021 JNSMR UIN Walisongo. All rights reserved.
Chemical Bonds: An Integration with Islamic Brotherhood Values Mega Legi Vela; Riky Setiawan; Metha Nur Kristanti; Tiyas Agustin; Anggita Ainur Rofiana; Anisa Nur Istiqomah; Annisa Dhaifa Salsabilla; Kustomo Kustomo; Novtavia Shintya Putri
Cakrawala: Jurnal Studi Islam Vol 16 No 2 (2021)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (455.384 KB) | DOI: 10.31603/cakrawala.5103

Abstract

Individuals will reap enormous benefits from bonding. There are always positive aspects to take from a bond. Covalent, ionic, and metallic bonds are examples of chemical bonds. The main ideas raised in chemical bonds are strengthened by incorporating Islamic character values. The primary objective of this study was to examine all chemical bonds and incorporate them into human life, especially in accordance with Islamic brotherhood. The findings of this study reveal that each chemical bond, whether covalent, ionic, or metallic, has a meaning that is closely related to human relations as social beings in accordance with Islamic values, as revealed by a literature review. Humans as social beings are taught to always have good relations with fellow humans through covalent bonds, and through ionic bonds, they are taught to help, work together, and take care of one another. Metallic bonds, on the other hand, teach humans to share and be sincere.
Analisis Kualitas Air pada Reservoir PDAM Kota Semarang Menggunakan Uji Parameter Fisika, Kimia, dan Mikrobiologi, serta Dikombinasikan dengan Analisis Kemometri Yunita Rohmawati; Kustomo Kustomo
Walisongo Journal of Chemistry Vol 3, No 2 (2020): 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.v3i2.6603

Abstract

Air menjadi kebutuhan yang sangat penting untuk kehidupan manusia. Perusahaan Daerah Air Minum (PDAM) Tirta Moedal merupakan Badan Usaha Milik Daerah (BUMD) Kota Semarang yang memberikan pelayanan air bersih dan air minum kepada warga masyarakat Kota Semarang. Tujuan dari penelitian ini adalah untuk menganalisis kualitas air pada parameter fisika, kimia, dan mikrobiologi pada enam titik lokasi reservoir di Kota Semarang kemudian hasilnya dibandingkan dengan standar baku mutu air bersih dan minum sesuai dengan Peraturan Menteri Kesehatan No.416/Menkes/Per/IX/1990 Tentang Persyaratan Kualitas Air Bersih dan Peraturan Menteri Kesehatan Republik Indonesia No.492/Menkes/Per/IV/2010 Tentang Persyaratan Kualitas Air Minum. Hasil penelitian menunjukan semua reservoir memenuhi standar baku air bersih. Berdasarkan hasil analisis kemometri menggunakan uji t satu sampel diperoleh bahwa thitung ttabel atau 1.72 2.57 dengan taraf signifikansi 95%, maka disimpulkan bahwa Ho diterima dan Ha ditolak, atau tidak ada perbedaan kualitas air pada ke-enam reservoir PDAM Tirta Moedal Kota Semarang dengan standar baku mutu air yang ditetapkan pemerintah (µ = standar baku mutu).
Adsorption of Cd (II) into Activated Charcoal from Matoa Fruit Peel Kustomo Kustomo; Naila Lajja Zulfa Faza; Andreas Haarstrick
Walisongo Journal of Chemistry Vol 5, No 1 (2022): 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.v5i1.11755

Abstract

Cadmium (Cd) is one of the heavy metals with a high level of contaminants that is environmentally harmful and can interfere with human health. This study aims to determine the adsorption capacity and adsorption kinetics of Cd (II) from Matoa fruit peel activated by nitric acid. The adsorption method can be used to treat Cd (II) waste in the water. Activated charcoal is used for adsorption. The charcoal produces a relatively 1.17 % ash content, 3.92 % water content, and a 507.64 mg/g iodine absorption test. Based on the results of FTIR characterization, it is known that the O-H and C=O groups play an important role in adsorption. The SEM-EDX characterization produced a carbon content of 99.21 %. At pH 9, activated charcoal adsorbs Cd (II) metal effectively, with a contact time of 40 minutes and a concentration of 20 ppm. The activated charcoal of Matoa fruit peel activated by nitric acid had an adsorption capacity of 59.75 mg/g. It used a pseudo-second-order reaction for the chemical kinetics equation and the Langmuir adsorption isotherm equation for the adsorption isotherm.
Co-Authors Andreas Haarstrick Anggita Ainur Rofiana Anisa Nur Istiqomah Annisa Dhaifa Salsabilla Dzikria Sari Pratiwi Mega Legi Vela Metha Nur Kristanti Naila Lajja Zulfa Faza Novtavia Shintya Putri Riky Setiawan Tiyas Agustin Wirda Udaibah Yunita Rohmawati