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Walisongo Journal of Chemistry
Published by Universitas Islam Negeri Walisongo Semarang
ISSN : 2549385X     EISSN : 26215985     DOI : 10.21580/wjc
Core Subject : Science,
Chemistry
Walisongo journal of chemistry is a peer reviewed and open access journal published by Chemistry Department, faculty of Science and Technology, UIN Walisongo Semarang. This journal covering all areas of chemistry including inorganic, organic, physic, analytic, biochemistry, and environmental chemistry. Walisongo Journal of Chemistry publish two issues annually (July and October). Article which accepted in this journal was written by Bahasa and English.
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Articles 203 Documents
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Effect of Ag addition into the Activity of Titanium Silicate-1 Catalyst in Cyclohexanone Reaction Dyah Fitasari; Didik Prasetyoko; Suprapto Suprapto
Walisongo Journal of Chemistry Vol 4, No 2 (2021): 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.v4i2.9384

Abstract

Titanium Silicate-1 (TS-1) has been successfully modified by combining Silver (Ag) metals. In this study, the preparation of Ag/TS-1 was carried out by impregnation method using a solution of silver nitrate (AgNO3) as a precursor to TS-1 with a loading variation of 0.5%, 1%, 2%, and 4%. Impregnation carried out on TS-1 aims to disperse Ag (1) only attached to the surface of TS-1 particles (before calcination/TK) and (2) on the entire surface of TS-1 particles (after calcination/K). The synthesized catalyst was then characterized by X-ray diffraction, infrared spectroscopy, and pyridine adsorption techniques. The XRD pattern shows that all the catalysts have high crystallinity with MFI structure, and there is no other crystalline phase. The infrared spectra showed that the titanium tetrahedral in TS-1 remained after Ag impregnation. The TS-1 and Ag/TS-1 catalysts were analyzed for their surface acidity using pyridine adsorption on the sample. The pyridine adsorption technique showed the presence of Lewis sites on Ag/TS-1. In this study, the presence of Ag loading on the Ag/TS-1 catalyst affected the TS-1 catalytic activity. The amount of cyclohexanone oxime product produced in XAg/TS-1 was more than in Ag/TS-1.
PENGARUH KONSENTRASI LARUTAN HF PADA PROSES PREPARASI TERHADAP KADAR UNSUR BAHAN MAGNETIK PASIR BESI Abraham Laurens Rettob; Martasiana Karbeka
Walisongo Journal of Chemistry Vol 2, No 1 (2019): 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.v3i1.3877

Abstract

Bahan magnetik (BM) pasir besi alam merupakan salah satu sumber adsorben magnetik. Selain BM, pasir besi alam juga mengandung bahan non-magnetik . Preparasi BM pasir besi dilakukan pada penelitian ini dengan tujuan untuk meningkatkan kadar unsur magnetik di dalamnya. Pasir besi alam yang digunakan berasal dari pesisir pantai Lansilowo. Preparasi dilakukan dengan pencucian menggunakan larutan HF dengan konsentrasi 0, 2, 5 dan 10%. Hasil analisis kadar unsur dengan XRF menunjukkan bahwa unsur dominan pada pasir besi Lansilowo adalah Fe dan Cr, yang merupakan unsur penyumbang sifat kemagnetan pada BM. Pencucian dengan larutan HF berbagai konsentrasi menyebabkan terjadinya perubahan kadar unsur pada BM. Semakin tinggi konsentrasi larutan HF mengakibatkan terjadinya peningkatan kadar Fe dan Cr total (89,56%) serta penurunan kadar Si (2,60%).  Hasil penelitian menunjukkan bahwa konsentrasi larutan HF optimum yang digunakan adalah 10%. 
Chromatography Profiles of Terpenoid Compounds in The Extract of Sambiloto (Andrographis paniculata) Herb from Various Solvents Mohammad Fajar Hadi Salim; I Made Arie Dharma Putra Nugraha; Farah Adilla; Luh Pratiwi Diva Yanti
Walisongo Journal of Chemistry Vol 4, No 2 (2021): 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.v4i2.7783

Abstract

Sambiloto (Andrographis paniculata) is widely used as a medicinal plant for Indonesians. The content of extracted bioactive compounds is affected by the polarity of the extraction solvent. This study aims to determine the effect of extraction solvent on the chromatographic profile of Sambiloto herb, especially terpenoid group using the TLC-Spectrophotodensitometry method. Sambiloto herb was extracted by sonication method using methanol, ethanol, ethyl acetate, and chloroform as the solvents. Chromatographic profiles were identified by stationary phase of TLC silica gel GF254 plate and a mobile phase of chloroform:methanol (10:1 v/v), observed visually, and scanned at 210 nm. The plate was sprayed with anisadehyd-sulfuric acid reagent and observed visually. The compounds that belong to terpenoid compounds, namely S2, S5, S8, S11, and S12, had a greater percentage of peak area than the total area so that they were categorized as major components. The extraction solvent for Sambiloto herb that provides the best chromatographic profiles was found in the solvent of methanol extraction.
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

Abstract

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.
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).
Pengaruh Penambahan Arang Aktif Limbah Tongkol Jagung Untuk Mengurangi Kadar Kesadahan Total Awwalunisa Aliya Kusuma; Binti Lathifaturrohmah; Eka Erfiana Dyah Lestari
Walisongo Journal of Chemistry Vol 3, No 1 (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.v3i1.6128

Abstract

Kesadahan total dalam air adalah jumlah kalsium dan magnesium yang terlarut dalam air. Tujuan dari penelitian ini adalah untuk mengetahui kadar kesadahan sebelum serta sesudah perlakuan dengan penambahan absorben berupa arang aktif tongkol jagung. Dilakukan uji aktivitasi arang aktif dari tongkol jagung pada sampel air tanah di lingkungan Kecamatan Cepu dengan menggunakan metode kompleksometri. Kadar kesadahan total sesudah perlakuan dengan penambahan absorben menurun. Kadar rata-rata kesadahan air sumur dari 3 sampel lokasi yang diteliti sebelum perlakuan 344,376 mg/L setelah perlakuan menjadi 216,765 mg/L. Berdasarkan hasil penelitian dapat diketahui bahwa penggunaan karbon aktif tongkol jagung dapat memberikan pengaruh terhadap penurunan tingkat kekeruhan serta kesadahan air tanah di lingkungan Kecamatan Cepu.
Desain Turunan Kalkon Baru Sebagai Antikanker Payudara Berdasarkan Molecular Docking Mutista Hafshah; Lilis Karlina
Walisongo Journal of Chemistry Vol 2, No 2 (2019): 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.v2i2.6025

Abstract

Penelitian ini dilakukan untuk menentukan senyawa turunan kalkon yang berpotensi sebagai antikanker payudara berdasarkan Molecular Docking. Protein yang digunakan yaitu 17β-hidroksisteroid dehydrogenase. Adapun ligan yang digunakan adalah 20 senyawa turunan kalkon yang dibandingkan dengan senyawa obat pembanding. Posisi pusat grid pada sisi aktif protein kanker payudara yang telah dilakukan pada penelitian sebelumnya yaitu pada leusin 149.X CB, serin 142.X OG, dan asparagine 152.X OD1. Software yang digunakan yaitu hyperchem, Gaussian03, Molden, Autodock Tools, Autodock4, dan chimera 1.5.3. Penelitian ini dilakukan dengan empat langkah yaitu pencarian kompleks protein-ligan 17β-hidroksisteroid dehydrogenase dengan kode PDB 3HB4, optimasi struktur ligan dengan metode perhitungan AM1, molecular docking, dan pemilihan senyawa turunan kalkon sebagai antikanker payudara. Hasil docking turunan kalkon memiliki akivitas daya hambat terhapat protein 17β-hidroksisteroid dehydrogenase dengan nilai sebesar 4,41 × 10-6M sampai 2,4783 × 10-7M. Hasil molecular docking didapatkan senyawa turunan kalkon sebagai antikanker payudara yaitu kalkon X memiliki tetapan inhibisi 2,4783 × 10-7M.
Phytochemical Test and Antioxidant Activity of Methanol Extract in Arabica Coffee Leaves by Using DPPH Method (1,1-Diphenyl-2-Picrylhydrazyl) Rosalina Yuliana Kurang; Rinda Yunita Kamengon
Walisongo Journal of Chemistry Vol 4, No 2 (2021): 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.v4i2.8032

Abstract

The use of coffee plants is more focused on the coffee beans as a brewing drink or as a food additive. Parts of the coffee plant, such as leaves, are considered waste and have not been properly utilized. This study aimed to determine the phytochemical content and antioxidant activity of the methanol extract in Arabica coffee (Coffea arabica) leaves. The method used in this study was the extraction and DPPH method (1,1-diphenyl-2-picrylhydrazyl). The results showed that the Arabica coffee leaves contained flavonoids, alkaloids, terpenoids, and phenolic compounds. The antioxidant activity test showed an IC50 value of 57.699 ppm with the strong antioxidant category.
Ag-ZSM-11 Zeolite Synthesis Using Silica from Elephant Grass for LED Application Citra D. D. Sundari; Soni Setiadji; Atthar Luqman Firmansyah; Dede Abdurahman; Denia Febby Nurbaeti
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.v2i2.3107

Abstract

Silica (SiO2) has been successfully isolated from elephant grass by the sol gel method through pH regulation using NaOH and HCl. The resulting silica has an amorphous character with crystalline phase impurities. The isolated silica was then used as a source of silica for the synthesis of ZSM-11 zeolite using the hydrothermal method with a ratio of SiO2 : TBAOH : H2O = 1 : 0.35 : 25. XRD characterization results confirmed the formation of ZSM-11 zeolite. The SEM results show that the ZSM-11 zeolite crystal morphology is oval with crystal growth in all directions. Immersion of the synthesized ZSM-11 zeolite into AgNO3 solution and followed by calcination resulted in zeolite Ag-ZSM-11 which has different optical properties compared to the initial ZSM-11 zeolite. Zeolite ZSM-11 gives purple luminescence while zeolite Ag-ZSM-11 gives pink luminescence when illuminated under UV lights
Produksi Biofuel Berbantuan Ultrasonik dari Minyak Kelapa Terkatalisis Ca/γ-Al2O3 dan K/γ-Al2O3 Eko Supriadi; Rahmat Basuki; Danawati Hadi Prajitno; Mahfud Mahfud
Walisongo Journal of Chemistry Vol 4, No 1 (2021): 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.v4i1.7861

Abstract

Penelitian ini bertujuan untuk membandingkan doping Kalium (K) dan Kalsium (Ca) pada support γ-Al2O3 dalam produksi biofuel yang berbentuk fatty acid methyl ester (FAME) melalui reaksi transesterifikasi minyak kelapa berbantuan ultrasonik. Reaksi dilakukan dalam tipe reaktor batch dengan perbandingan mol minyak kelapa:etanol = 1:9, dan variasi konsentrasi berat katalis untuk masing-masing katalis K/γ-Al2O­3 dan Ca/γ-Al2O3 terhadap minyak kelapa (0,5%; 1,0%; 1,5%; 2% dan 2,5%), waktu reaksi (30, 60, 90, 120 dan 150 detik), dan frekuensi ultrasonik (20 dan 40 KHz). Keberhasilan doping ditunjukkan pada hasil karakterisasi K/g-Al2O3 ­dan Ca/g-Al2O3 menggunakan X-Ray Diffraction (XRD) yang menghasilkan puncak 2θ karakteristik K (29,70° dan 32,65°) dan Ca (25,35°, 26,77°, dan 27,17°) pada support g-Al2O3 (37,66°, 45,82° dan 67,22°). Karakterisasi menggunakan Surface Area Analyzer (SAA) menunjukkan bahwa katalis K/g-Al2O3 memiliki luas permukaan yang lebih kecil (34,03 m2/g) dibanding Ca/g-Al2O3 (83,77 m2/g), namun diameter pori yang lebih besar (66,12 Å) dibanding Ca/g-Al2O3 (35,22 Å). Katalis K/g-Al2O3 menghasilkan yield FAME yang lebih besar (93,19%) dibanding Ca/γ-Al2O3 (29,76%) pada konsentrasi katalis 2,5%, waktu reaksi 150 detik dan frekuensi ultrasonik 40 kHz. Kualitas FAME terkatalisis K/g-Al2O3 yang dihasilkan memenuhi empat parameter uji: densitas, viskositas kinematic, titik nyala, dan titik tuang sesuai dengan standar SNI 04-7182-2006.

Page 9 of 21 | Total Record : 203

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