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All Journal Bulletin of Chemical Reaction Engineering & Catalysis PROSIDING SEMINAR KIMIA Jurnal Tadris Kimiya Jurnal Zarah Communications in Science and Technology Jambura Journal of Educational Chemistry Jurnal Riset Pendidikan Kimia (JRPK) Bivalen: Chemical Studies Journal International Journal of Social Science Bulletin of Chemical Reaction Engineering & Catalysis
Iis Intan Widiyowati
Program Studi Pendidikan Kimia Jurusan Pendidikan MIPA FKIP Universitas Mulawarman
Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Medicine & Pharmacology Public Health Social Sciences Other

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Pengaruh konsentrasi terhadap penjerapan ekstrak etanol pucuk daun pucuk merah (Syzygium oleana) oleh kertas saring Ajeng Hayu Pratiwi; Iis Intan Widiyowati; Sela Defi Alib Pradani; Sukemi Sukemi
Bivalen: Chemical Studies Journal Vol 4 No 1 (2021)
Publisher : Bachelor Degree Program of Chemical Education - Mulawarman University | Program Studi S-1 Pendidikan Kimia - Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/bcsj.v4i1.719

Abstract

Penggunaan kertas indikator asam basa khususnya pada daerah terpencil sangatlah terbatas, maka diperlukan suatu alternatif kertas indikator asam basa dengan memanfaatkan tanaman lokal. Mobilisasi ekstrak etanol pucuk daun pucuk merah (Syzygium oleana) telah dilakukan dan menghasilkan kertas indikator yang dapat berubah warna pada pH yang berbeda. Penelitian ini dirancang untuk mengetahui pengaruh konsentrasi terhadap penjerapan ekstrak etanol pucuk daun pucuk merah (PDPM) oleh kertas saring. Ekstrak etanol PDPM diperoleh dengan menggunakan metode maserasi selama 24 jam dengan perbandingan ekstraksi antara sampel dan pelarut 1 : 7. Proses penjerapan kertas saring dilakukan pada konsentrasi yang berbeda selama 2 jam dengan material liquor ratio (MLR) 1: 100 pada suhu 81℃, berat kertas saring 0,2884 ± 0,0035 gram dan volume larutan 30 mL. Hasil penelitian menunjukkan bahwa konsentrasi berpengaruh terhadap penjerapan ekstrak etanol PDPM pleh kertas saring. % adsorpsi ekstrak oleh kertas saring semakin menurun dengan meningkatnya konsentrasi ekstrak.
Pengaruh model pembelajaran flipped classroom terhadap hasil belajar siswa pada pokok bahasan larutan penyangga Nimas Ayu Norma Putri; Iis Intan Widiyowati; Muhammad Amir Masruhim
Bivalen: Chemical Studies Journal Vol 4 No 1 (2021)
Publisher : Bachelor Degree Program of Chemical Education - Mulawarman University | Program Studi S-1 Pendidikan Kimia - Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/bcsj.v4i1.721

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh model flipped classroom terhadap hasil belajar siswa SMA pada pokok bahasan larutan penyangga. Jenis penelitian ini adalah true-experimental dengan desain post-test only control group design. Pembelajaran menggunakan e-learning Schoology. Sampel adalah siswa kelas XI IPA yang diambil menggunakan teknik cluster random sampling. Satu kelompok siswa diajar menggunakan model pembelajaran langsung (kelas kontrol) dan satu kelompok siswa diajar menggunakan model flipped classroom. Hasil belajar siswa diambil menggunakan teknik tes dari hasil post-test dan ulangan harian. Untuk mengetahui adanya pengaruh dilakukan uji t pada taraf signifikan 5%. Hasil penelitian menunjukkan bahwa rata-rata hasil belajar siswa kelas eksperimen lebih tinggi dari rata-rata hasil belajar siswa kelas kontrol dan berbeda signifikan. Hasil ini menunjukkan bahwa terdapat pengaruh model pembelajaran flipped classroom terhadap hasil belajar siswa pada pokok bahasan larutan penyangga.
INTERACTIVE POWERPOINTS IN ONLINE TGT-BASED MODELS ON THERMOCHEMICAL MATERIALS Ratna Kusumawardani; Muhamad Hamami Nata; Iis Intan Widiyowati
International Journal of Social Science Vol. 1 No. 4: December 2021
Publisher : Bajang Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53625/ijss.v1i4.702

Abstract

The closure of schools due to the Covid-19 pandemic has forced all schools in Indonesia to be closed temporarily, therefore learning must be carried out online. Online learning is commonly carried out with teacher presentations and assignments therefore this makes learning monotonous and boring for students. So we need a medium that makes learning more interesting, namely with interactive powerpoints. The purpose of this study was to determine the effect of using interactive powerpoints in the online-based TGT model on thermochemistry material. This type of research is quasi-experimental research with a post-test only control group design. The data collection technique used the technique of daily test tests, documentation, and student perception questionnaires. The data were analyzed using the normality test, F test, and t test with a significance level of 5%. The results showed that before being given the treatment, the two classes were normally distributed, homogeneous variations and there was no difference in student absorption. After being given the treatment, the two classes had significant differences in absorption. Therefore it can be concluded that there is an effect of using interactive powerpoints in the online-based TGT model on thermochemistry material.
Kinetic of Adsorption Process of Sulfonated Carbon-derived from Eichhornia crassipes in the Adsorption of Methylene Blue Dye from Aqueous Solution Mukhamad Nurhadi; Iis Intan Widiyowati; Wirhanuddin Wirhanuddin; Sheela Chandren
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 1 Year 2019 (April 2019)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.14.1.2548.17-27

Abstract

The evaluation of kinetic adsorption process of sulfonated carbon-derived from Eichhornia crassipes in the adsorption of methylene blue dye from aqueous solution has been carried out. The sulfonated carbon-derived from E. crassipes (EGS-600) was prepared by carbonation of E. crassipes powder at 600 °C for 1 h, followed by sulfonation with concentrated sulfuric acid for 3 h. The physical properties of the adsorbents were characterized by using Fourier transform infrared spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and nitrogen adsorption-desorption studies. Adsorption study using methylene blue dye was carried out by varying the contact time and initial dye concentration for investigated kinetics adsorption models. The effect of varying temperature was used to determine the thermodynamic parameter value of ΔG, ΔH, and ΔS. The results showed that the equilibrium adsorption capacity was 98% when EGS-600 is used as an adsorbent. The methylene blue dye adsorption onto adsorbent takes place spontaneity and follows a pseudo-second-order adsorption kinetic model. 
Effective TiO2-Sulfonated Carbon-derived from Eichhornia crassipes in The Removal of Methylene Blue and Congo Red Dyes from Aqueous Solution Iis Intan Widiyowati; Mukhamad Nurhadi; Muhammad Hatami; Lai Sin Yuan
Bulletin of Chemical Reaction Engineering & Catalysis 2020: BCREC Volume 15 Issue 2 Year 2020 (August 2020)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.15.2.6997.476-489

Abstract

The study of TiO2-sulfonated carbon-derived from Eichhornia crassipes (TiO2/SCEC), as an effective adsorbent to remove Methylene blue (MB) and Congo red (CR) dyes from aqueous solution, has been conducted. The preparation steps of TiO2/SCEC adsorbent involved the carbonisation of E. crassipes powder at 600 °C for 1 h, followed by sulfonation of carbon for 3 h and impregnation through titanium(IV) isopropoxide (500 µmol). The physical properties of the adsorbents were characterized by using X-ray fluorescence (XRF), Fourier transform infrared, X-ray diffraction (XRD), Scanning electron microscopy with Energy dispersive X-ray (SEM-EDX), Thermogravimetric analysis (TGA) and nitrogen adsorption-desorption studies. The dye removal study using TiO2/SCEC adsorbent was carried out by varying of contact time, adsorbent dosage, initial dye concentration, pH, particles size of adsorbent and temperature. The kinetics models were determined by the effects of contact time and the thermodynamic parameters (ΔH, ΔS, and ΔG), which were calculated by the effects of temperature. The results showed that the maximum dye removal capacity of TiO2/SCEC were 18.8 mg.g-1 for MB and 36.5 mg.g-1 for CR. The removal of MB and CR dyes using TiO2/SCEC adsorbent performed a pseudo-second order kinetic models with spontaneity. Copyright © 2020 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Hubungan Kebiasaan Belajar pada Masa Pandemi Covid-19 terhadap Prestasi Belajar Kimia Siswa Kelas X SMA Negeri di Kabupaten Kutai Barat Meri; Kusumawardhani, Ratna; Widiyowati, Iis Intan
Jurnal Riset Pendidikan Kimia (JRPK) Vol. 13 No. 1 (2023): Jurnal Riset Pendidikan Kimia (JRPK), Volume 13 Nomor 1 (2023)
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRPK.131.08

Abstract

Abstract This study aims to determine the relationship between study habits during thepandemic COVID-19and the chemistry learning achievement of class X State Senior High School students in West Kutai Regency. The population used was all X grade students from three public high schools in West Kutai Regency consisting of SMAN 1 Linggang Bigung, SMAN 1 Long Iram and SMAN 2 Sendawar with non- probability sampling using purposive sampling method and obtained a sample of 129 students. The instrument used was a study habit questionnaire. This type of research isresearch ex past facto. Data analysis used descriptive statistics and inferential statistics, namely simple linear regression analysis with a significance level of 5%. Based on the results of descriptive data analysis, it was obtained that students' study habits were in the medium category with a percentage of 35.66% and student achievement variables were in the medium category with a percentage of 31.78%. From the results of inferential analysis using simple linear regression, the t-test obtained a significance of 0.583 > 0.05, indicating that there is no relationship between study habits and academic achievement in class X State Senior High School Students in West Kutai Regency. Keywords Study Habits, Chemistry Study Achievement, COVID-19.
One pot two-step borylation/fluorination reaction of dysobinin from Chisocheton macrophyllus and its cytotoxicity against cancer cell Huda, Muhammad Badrul; Nurlelasari; Safriansyah, Wahyu; Fajar, Mohamad; Widiyowati, Iis Intan; Supratman, Unang; Permana, Yessi; Budiman, Yudha P.
Communications in Science and Technology Vol 9 No 2 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.2.2024.1514

Abstract

Dysobinin is a naturally occurred limonoid, which is a specific form of triterpenoid, mostly found in certain plants, particularly the Meliaceae family. Overall, it has been found that limonoids have a wide range of biological functions. Typically, the compound comprises anticancer, antimicrobial, and anti-inflammatory properties. Even though dysobinin has shown some effectiveness, its potential in pharmacology, so far, is found limited. This study, therefore, aims to enhance the pharmacological properties of dysobinin through the addition of fluorine. To do this, a one-pot, two-step reaction comprising C-H borylation and selectfluor was used to turn dysobinin into two new compounds: 1,2-dihydro-6?-acetoxyazadirone (5) and 1?-fluorodysobinin (6). After the transformation, various spectroscopic methods, including UV (Ultraviolet), IR (infrared), MS (mass spectra), as well as NMR (1D and 2D) were applied to figure out the structures of the new compounds. Accordingly, of the derived compounds, 1?-fluorodysobinin showed significantly higher cytotoxicity against A549 lung cancer cells when compared to dysobinin.
KOMPOSIT HIDROKSIAPATIT DARI CANGKANG TELUR DENGAN TiO2 SEBAGAI KATALIS DALAM PROSES ADSORPSI METHYLEN BLUE Lutfiana, Ayu; Cahyadi, Setiawan; Luthfiyah, Luthfiyah; Qolbiah, Iftatun; Jelsy, Jelsy; Putri, Noni Khaisha; Widiyowati, Iis Intan
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Hydroxyapatite (HAp) is an inorganic compound composed of calcium (Ca) and phosphate (PO43-). This compound is useful for removing colored liquid waste and becomes an environmentally friendly adsorbent. HAp sources are very abundant and have high economic value, one of which is eggshells. Eggshells contain 94% calcite compound, this compound contributes to the mechanical properties and strength of HAp. HAp has unique properties of high ion exchange and adsorption, high thermal stability, and non-toxicity, but there are shortcomings of HAp namely poor mechanical properties and brittleness. A way to improve the mechanical strength of HAp is to composite it with metals. This study was designed to determine the adsorption ability of hydroxyapatite (HAp/TiO2) composite from eggshell against methylene blue. In this study, the synthesis of HAp using hydrothermal method with eggshell material through the calcination process with a temperature of 1000°C obtained the results of CaO which will be synthesized into pure HAp and the results of HAp will be composited with TiO2 metal. The results of HAp/TiO2 are used to adsorb methylene blue with several variations, namely mass, pH, concentration, and time. From the various variations obtained results for the optimum mass variation of 0.125 grams, the optimum contact time at 4 hours, and for the optimum concentration with pH 9, and at a concentration of 100 ppm provides maximum adsorption results against methylene blue. Keywords : Hydroxyapatite; Composite; Adsorption; Methylene Blue
Analysis of Argument-Driven Inquiry Activity in Chemistry Textbooks Iis Intan Widiyowati; Ainun Rezkiva Arif; Sukemi Sukemi
Jurnal Tadris Kimiya Vol 8, No 2 (2023)
Publisher : Department of Chemistry Education, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jtk.v8i2.21243

Abstract

Argument-Driven Inquiry (ADI) in science learning can improve students' argumentation skills and understanding of concepts. In the textbooks, it is important to have ADI activities inside. This research aims to analyze ADI activities in the high school chemistry textbook Revised Curriculum 2013. This research used nine indicators of ADI activities: questions, evidence, student explanation, scientific theories, argumentation, communication and justification, analysis, connection, investigation report, and reflection. The research method used a descriptive instrument as an analysis sheet prepared based on ADI activities. Data was collected using documentation techniques and data analysis using content analysis of ADI activities. The results showed that the reliability test of the data obtained was 0.94 in the very good category. The ADI activity most found in textbooks is evidence activity, with a percentage of 31.25 Meanwhile, the textbook needs to explain question and answer and reflection activities. The textbook needs to increase ADI activities that support student-centered learning and teaching.
Pemanfaatan tulang bebek sebagai adsorben metilen biru pada limbah industri tekstil Widiyowati, Iis Intan; Arif, Ainun Rezkiva; Habibah, Sitti; Andriani, Ega; Sari, Lovya Riska; Izzati, Zakiyah Ayu Noor
Bivalen: Chemical Studies Journal Vol. 5 No. 1 (2022)
Publisher : Bachelor Degree Program of Chemical Education - Mulawarman University | Program Studi S-1 Pendidikan Kimia - Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Industri tekstil saat ini, menimbulkan masalah baru yaitu limbah. Salah satunya di Kalimantan Timur, merupakan penghasil tesktil dibidang tenun sarung Samarinda. Dalam pewarnaan tenun, menggunakan pewarna alami dan sintesis. Penggunaan pewarna sintesis dapat menghasilkan limbah yang sangat berbahaya jika di buang langsung ke lingkungan, terutama sungai. Salah satu cara yang dapat digunakan untuk mengurangi limbah cair zat warna adalah dengan menggunakan adsorben. Tujuan dari penelitian ini adalah untuk mengetahui massa optimum, waktu kontak optimum, dan pH optimum terhadap adsorbsi metilen biru dengan menggunakan adsorben teraktivasi dari tulang bebek serta penentuan model kinetika adsorbsi dan isoterm adsorbsi. Teknik analisis data menggunakan Microsoft Excel 2010. Hasil penelitian menunjukkan bahwa massa optimum adsorben yang diperoleh pada 0,75 gram yang diaktivasi selama 6 jam dengan suhu 600℃, waktu kontak optimum diperoleh pada 40 menit, dan derajat keasaman (pH) optimum berada pada pH 5, serta model kinetika adsorbsi yang diperoleh ialah pada model pseudo orde 2 dan model isoterm adsorpsi Freundlich.
Co-Authors Ahmad Rajab Ainun Rezkiva Arif Ajeng Hayu Pratiwi Ana Fatimah Arma Andriani, Ega Ani Suryani Simbolon Arif, Ainun Rezkiva Budiman, Yudha P. Cahyadi, Setiawan Dini Yulia Sari Eka Parmawatika Fajar, Mohamad Fitria Usmanti Huda, Muhammad Badrul Izzati, Zakiyah Ayu Noor Jelsy, Jelsy Lai Sin Yuan Laurensia Brigita Claudia Lutfiana, Ayu Luthfiyah Luthfiyah Maasje C. Watulingas Mariatul Ulfah Maulidina Rizki Meri Muh. Amir Masruhim Muhamad Hamami Nata MUHAMMAD AMIR MASRUHIM Muhammad Hatami Mukhamad Nurhadi, Mukhamad Nimas Ayu Norma Putri Nurlaili, Nurlaili Nurlelasari Oktaviana Oktaviana Pitriani Pitriani Putri, Noni Khaisha Qolbiah, Iftatun Rahmawati Rahmawati Ratna Kusumawardani, Ratna Ratna Kusumawardhani Ria Retnowati Rony, Zahara Tussoleha Safriansyah, Wahyu Sari, Lovya Riska Sela Defi Alib Pradani Sheela Chandren Sheela Chandren Siti Nurjanah Sitti Habibah Sukemi Sukemi Susi Susanti Syaiful Bahri Unang Supratman Usman Wirhanuddin Wirhanuddin Yessi Permana