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All Journal Medina-Te : Jurnal Studi Islam Orbital: Jurnal Pendidikan Kimia Walisongo Journal of Chemistry Equilibrium Journal of Chemical Engineering J-CEKI
Hasan Marzuki
Universitas Islam Negeri Raden Fatah Palembang
Religion Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Engineering Materials Science & Nanotechnology Social Sciences

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ANALISIS KESULITAN PEMAHAMAN KONSEP PADA MATERI TITRASI ASAM BASA SISWA SMA Resti Tri Astuti; Hasan Marzuki
Orbital: Jurnal Pendidikan Kimia Vol 1 No 1 (2017): Orbital: Jurnal Pendidikan Kimia
Publisher : Chemistry Education Department of Education and Teaching Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/ojpk.v1i1.1862

Abstract

Penelitian ini bertujuan untuk mengetahui kesulitan pemahaman konsep pada materi titrasi asam basa siswa SMA. Penelitian ini menggunakan metode deskriptif dengan data hasil penelitian diperoleh dari hasil tes siswa. Instrumen yang digunakan yaitu tes uraian, wawancara dan dokumentasi tentang materi titrasi asam basa. Penelitian ini dilakukan di SMA Percontohan UPI dengan subjek sebanyak 30 orang siswa SMA Kelas XII IPA yang telah mempelajari materi titrasi asam basa. Kesulitan pemahaman konsep yang dialami oleh siswa yaitu siswa kesulitan dalam menjelaskan pemilihan indikator sebanyak 53,33%, siswa kesulitan dalam menuliskan persamaan dan menyetarakan persamaan reaksi asam sulfat dan natrium hidroksida sebanyak 56,65%, siswa kesulitan dalam menentukan konsentrasi asam yang bervalensi dua sebanyak 70,00% dan 10,00% kesalahan siswa dalam menentukan konsentrasi asam dan basa bervalensi satu. Siswa kesulitan dalam 86,66% siswa tidak dapat menentukan jenis titrasi berdasarkan kurva dan siswa kesulitan dalam menentukan jenis zat pada setiap daerahsebesar 80,00%. Faktor penyebab kesulitan pemahaman konsep yang dialami siswa disebabkan oleh cara mengajar guru dan siswa itu sendiri.
Silica-Rice Husk as Adsorbent of Cr (VI) Ions Prepared through Sol-Gel Method Siti Rodiah; Mifta Huljana; Jauharuddin Luthfi Al Jabbar; Chairul Ichsan; Hasan Marzuki
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.v4i1.8045

Abstract

One of the heavy metals contained in the textile industry wastewater is chromium (Cr). Chromium hexavalent ions (Cr6+) are highly toxic and its accumulation in the human body will cause various negative impacts. This study aimed to determine the characteristics of silica synthesized by the sol-gel method to gain homogeneity and high purity. Synthesized silica was calcined at 700°C for 4 hours and its performance to adsorb Cr(VI) ions  in textile wastewater was investigated. The presence of -OH group from silanol (–Si-OH) was appeared at wavenumber 3367.70 cm-1, meanwhile siloxane functional groups were recorded at 1056.99 cm-1 and 784.38 cm-1 due to the O-Si-O asymmetric stretching and Si-O bending vibration. Optimum conditions of silica to adsorb Cr(VI) ions took place at pH 2 and contact time of 90 minutes by adsorption efficiency of 75,65% and followed the Freundlich isotherm.
Disorientasi Harmonisasi Rumah Tangga dalam Keluarga Muslim di Era Digital Sarkowi Sarkowi; Marzuki Marzuki; Fajar Kamizi; Hana Pertiwi
Medina-te : Jurnal Studi Islam Vol 18 No 2 (2022): Medina-Te: Jurnal Studi Islam
Publisher : Pascasarjana Universitas Islam Negeri Raden Fatah Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/medinate.v18i2.15465

Abstract

Islamic studies with an astronomical approach are interesting and important, because the history of the development of Muslims in religious practice cannot be separated from the astronomical field as well as advanced technology and also science. This journal aims to reveal three things are: first, the understanding of the astronomical approach second, methods, techniques, and research steps in the astronomical approach third, the implementation of the astronomical approach in Islamic studies. The method used is a literature study by digging from primary and secondary books as well as national and international scientific journals. The results of this study indicate are: first, etymologically astronomy comes from the Greek, namely Astron (ἄστρον, “star”) and Nomos (νόμος law/culture). According to the term is the science of calculation or almanac determination, the physical and chemical properties of objects that can be seen in the sky and beyond the earth. Second, the research method used in the astronomical approach is literature study and observation. Third, among the implementations, namely the application of determining Islamic dates, the application of the cardinal directions in determining the Qibla direction, application in weather prediction, as well as the sun, stars, moon in predicting sunny weather, rain or eclipses.
Synthesis of Water Hyacinth/Cassava Starch Composite as An Environmentally Friendly Plastic Solution M. Mahfudz Fauzi Syamsuri; Hasan Marzuki; Dedi Wahyu Ari Setiawan; Rusmaniar Rusmaniar; Tri Astika
Equilibrium Journal of Chemical Engineering Vol 7, No 2 (2023): Volume 7, No 2 December 2023-- Online First
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v7i2.76508

Abstract

Abstract. Conventional plastics made from petroleum polymers were the largest contributor to solid waste on earth. Environmentally friendly bioplastic fabricated by compositing starch and natural fibers were proposed to be a solution to this problem. The purpose of this research was to synthesize bioplastic from water hyacinth fiber composite with cassava starch and test its mechanical properties. Bioplastic fabrication was using melt intercalation method using water hyacinth fibers (WHF) with and without alkali treatment mixed with cassava starch (CS) and glycerol as plasticizer. The resulting bioplastic were characterized with FT-IR and tested for mechanical properties. The mechanical test results showed that water hyacinth fiber alkaline treated/cassava starch (WHF-AT/CS) bioplastic has tensile strength, % elongation, and water absorption values of 1.226 MPa, 3.33%, and 10.26%, respectively. While the bioplastic water hyacinth fiber untreated/cassava starch (WHF-UT/CS) has a tensile strength test value, % elongation, and water absorption of 0.306 MPa, 1.67%, and 11.39, respectively.  Therefore it can be said that WHF-AT/CS bioplastic has better mechanical properties when compared to WHF-UT/CS bioplastic.Keywords:Biocomposite, Bioplastic, Cassava Starch, Water Hyacinth Fiber
Zakat dan Perannya dalam Memajukan Keadilan dan Kesetaraan Sosial Marzuki Marzuki; Resfika Elsa Nadila
J-CEKI : Jurnal Cendekia Ilmiah Vol. 3 No. 6: Oktober 2024
Publisher : CV. ULIL ALBAB CORP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56799/jceki.v3i6.5385

Abstract

Those who practice Islam are obliged to pay zakat, which is a kind of zakat that must be distributed according to Islamic law,to thosewhoareable toreceive it.One of the pillars of Islam that is used to improve social welfare and welfare is zakat. Zakat is a means that Muslims hope to alleviate material and spiritual poverty, foster social solidarity, and provide for the general public.Various sources indicate that zakat is not only a religious obligation but also an effective instrument in providing food and alleviating social suffering.
Co-Authors Astuti, Resti Tri Chairul Ichsan Dedi Wahyu Ari Setiawan Fajar Kamizi Hana Pertiwi Jauharuddin Luthfi Al Jabbar M. Mahfudz Fauzi Syamsuri Mifta Huljana Resfika Elsa Nadila Rusmaniar Rusmaniar Sarkowi Sarkowi Siti Rodiah Tri Astika