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All Journal Erudio: Journal of Educational Innovation Alotrop Jurnal Pendidikan dan Ilmu Kimia Science and Physics Education Journal (SPEJ) Journal of Science Education Research PENDIPA Journal of Science Education JURNAL PENDIDIKAN TAMBUSAI Jurnal Paedagogy IJORER : International Journal of Recent Educational Research al Kimiya : Jurnal Ilmu Kimia dan Terapan
M. Lutfi Firdaus
FKIP Universitas Bengkulu
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Languange, Linguistic, Communication & Media Mathematics Social Sciences Other

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THE IMPLEMENTATION OF A FLIPPED CLASSROOM MODEL UTILIZING A SCIENTIFIC APPROACH AND FLIPBOOK MAKER E-MODULE TO IMPROVE STUDENT LEARNING OUTCOMES Dewi Handayani; Endang Widi Winarni; Agus Sundaryono; Muhammad Lutfi Firdaus; Muzanip Alperi
Erudio Journal of Educational Innovation Vol 8, No 1 (2021): Erudio Journal of Educational Innovation
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18551/erudio.8-1.7

Abstract

This research aimed to determine the influence of the flipped classroom model on students learning outcomes on the chemistry subject, particularly on electrolyte and non-electrolyte solutions. This research employed pre-experimental research and a one-group pre-test post-test design on one sample group. We used the method to compare pre-test and post-test results. This research was conducted in Public High School 9, Bengkulu City, Bengkulu Province, Indonesia. The population was 76 tenth graders of Mathematics and Natural Science Class. As many as 25 students of Class X-I were chosen as the samples using purposive sampling. The research instrument was pre-test and post-test, consisting of 10 questions to assess learning outcomes. We analyzed the average value of learning outcomes. The SPSS application was used to evaluate the normality, homogeneity, and hypotheses. The average pre-test score was 64.6, and the average post-test score was 87.8. Learning outcomes were normally and homogeneously distributed. The hypothesis testing produced a significance value of 0.000<0.05. Therefore, the flipped classroom model using a scientific approach and e-modules significantly affected the learning outcomes of the chemistry subject. The research result showed that the implementation of the flipped classroom model positively affected and improved the learning outcomes on the chemistry subject, particularly on electrolyte and non-electrolyte solutions.  
Review Nanomaterial Sebagai Sensor Melamin dan Zat Aditif lainnya Secara Kolorimetri Wangi Pusva K.; Edwin Saputra; Rima Mayesmy H.; M. Lutfi Firdaus
PendIPA Journal of Science Education Vol 4, No 3 (2020): JULY - OCTOBER
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/pendipa.4.3.98-115

Abstract

Manusia membutuhkan nutrisi untuk kelangsungan hidupnya. Salah satu nutrisi yang dibutuhkan oleh manusia adalah protein.  Protein dapat diperoleh melalui produk makanan atau minuman. Produk yang memiliki kandungan protein yang cukup tinggi, salah satunya terdapat pada susu. Akan tetapi, susu seringkali mengandung zat aditif yang berbahaya bagi Kesehatan, seperti melamin. Penambahan melamin secara ilegal pada susu ditujukan untuk meningkatkan kadar nitrogen yang tinggi (66% massa) sehingga pada saat susu diperiksa seolah-olah susu tersebut mempunyai kandungan protein yang tinggi. Dalam artikel review ini, kami melakukan studi literatur bagaimana cara mendeteksi kadar melamin dan zat sintesis serta aditif lainnya di dalam makanan dan minuman. Hasil yang diperoleh yaitu nanopartikel dapat menganalisis kandungan melamin dengan metode kolorimetri menggunkan nanomaterial (AuNPs dan AgNPs). Sistem biosensing berbasis serat optik menggunakan resonansi plasmon permukaan lokal dari AuNPs dan AgNPs untuk deteksi kolorimetri melamin. Hasil percobaan dari literatur yang didapat menunjukkan hubungan linier yang baik antara perbedaan nilai absorbansi pada panjang gelombang 520 nm AuNPs dengan konsentrasi melamin dalam susu cair pada rentang antara 0,1 ?M sampai 0,9 ?M, dengan batas deteksi sebesar 33 nM.
Inovasi Sistem Stack Microbial Fuel Cell menggunakan Substrat Limbah Rumen Sapi serta Implementasinya sebagai Media Pembelajaran Diya Novarina; Eko Swistoro; M. Lutfi Firdaus; Rosane Medriati
PendIPA Journal of Science Education Vol 2, No 3 (2018): October
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (523.153 KB) | DOI: 10.33369/pendipa.2.3.188-195

Abstract

ABSTRACT[Innovation of microbial fuel cell stack system using cow rumen waste substrate and its implementation as a learning media]. The aims of this study are to: 1) describe the difference of Electric Motion (GGL), 2) describe the difference of electric power per unit area of the anode (Pa) which is produced between the series design MFC type series, parallel, mixed type 1 and mixed type 2, and 3) describe the significant difference of learning outcomes between the PBL learning model using MFC media with PBL learning model by using the electrical kit medium on dynamic electrical concept in SMA Muhammadiyah 4 Bengkulu. The free variable of this research are MFC stack system design (series, parallel, mixed types 1 and 2) and the dependent variable is GGL and electric power per unit of anode surface area. The results are obtained difference GGL and Pa between series design, parallel, mixed types 1 and 2 by comparison are 3: 1: 1,5: 2 whereas Pa ratio is 1: 10: 6: 2 with maximum GGL is obtained in series design of 3,29 V and Pa maximum in parallel circuit 21,76 mW / m2. Implementation of MFC series as a learning media used Problem Based Learning model on physics learning Implementation of MFC circuit with research design using one group pretest-posttest design. The testing of hypothesis with t-test shows tcount 2.739> ttable 2,001 and 95% significant level so it can be concluded there are significant differences in learning outcomes of PBL learning model by using MFC media with PBL learning model by using media Electric Kit on dynamic electrical concept in SMA Muhammadiyah 4 Bengkulu. Keywords: Stack Microbial Fuel Cell (MFC) Sistem; Rumen Cow Liquid Waste; Learning Media.
Application of Gold Silica Nanocomposites in Electrochemical Biosensors: A Review Salma Nur Zakiyyah; Diana Rakhmawaty Eddy; M. Lutfi Firdaus; Yeni Wahyuni Hartati
PendIPA Journal of Science Education Vol 5, No 2 (2021): MARCH - JUNE
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/pendipa.5.2.122-132

Abstract

Gold silica nanocomposite-based biosensors are performing well in sensor technology for biosensor development. Due to this biosensor has good selectivity, excellent conductivity, large surface area, efficient enhancement of electron transfer between enzymes and electrodes and good biocompatibility. Therefore, gold silica nanocomposite can be an ideal matrix for immobilization of biomolecules. This review describes the method of synthesizing gold silica nanocomposites and their characterization, interaction with biomolecules and application of gold silica nanocomposites in electrochemical biosensors.
PENJERAPAN ZAT WARNA SINTETIS MENGGUNAKAN KARBON AKTIF KELAPA SAWIT DAN PENGEMBANGANNYA SEBAGAI BAHAN AJAR Efa Susanti; M.Lutfi Firdaus; Sumpono Sumpono
PendIPA Journal of Science Education Vol 1, No 1 (2017): october
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (356.325 KB) | DOI: 10.33369/pendipa.1.1.12-18

Abstract

This study aims to: (1) explain the ability of the active carbon absorption of Palm Oil Palm as a dye adsorbent Reactive Red and Direct Green (2) determines the pH, contact time, and weight of the optimum adsorbent and the influence of temperature using activated carbon. Reactive Red and Direct Green dyestuffs. (3) to explain the influence of video media usage on the improvement of learning result and critical thinking ability of students in Chemistry class XI MIPA E at SMAN 2 Kota Bengkulu. The procedure in this study is the activation of activated carbon of palm oil and activated, activated carbon characterization using FTIR, Determination of maximum wavelength (?), Calibration curve creation, Adsorption of substance by activated carbon of palm oil: determining pH, contact time, adsorbent weight, , adsorption isotherms, Determination of temperature effect, Adsorption Isotherm Determination, Determination of adsorption kinetics, Applications on dyestuffs. The data were analyzed. The result of pH variation, variation of adsorbent weight, and contact time were made curve so that pH, adsorbent weight, concentration and optimum contact time were obtained using Excel program. Using ANAVA one way, followed by KR-20 test and one sample t test. The results showed that there were: reactive red optimum wavelength 496 nm, optimum pH 3, optimum time 40 min, absorbent weight 150 mg, maximum absorbency KAPKS 32,73 mg / gr and direct green optimum wavelength 613 nm, with optimum pH 5, optimum time 40 minutes, absorbent weight 150 mg, maximum absorbency KAPKS 32.825 mg / gr. there is an increase of chemistry learning outcomes during the enrichment hours or outside of class hours and critical thinking skills of grade XI IPA E SMAN2 Kota Bengkulu using audio-visual media with average pretest score of 75 and average post test score 82.27 with four criteria critical thinking skills are less critical by 26%, critical enough 43%, critical 23% and very critical at 8%.
Penggunaan Data Mikrotremor Dan Vs30 Untuk Mengetahui Hubungan Ketebalan Sedimen Terhadap Produktivitas Kelapa Sawit Dan Implementasinya Dalam Pembelajaran Fisika Riska Marwanti; M.Lutfi Firdaus; M Farid
PendIPA Journal of Science Education Vol 1, No 1 (2017): october
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (546.429 KB) | DOI: 10.33369/pendipa.1.1.25-31

Abstract

The aims of this study were to determine the relationship of sediment thickness to palm oil productivity and to know the improvement of student learning outcomes after learning using LKPD based on service learning. This study was conducted using HVSR (Horizontal to Vertical Spectral Ratio) method. Data were collected as 10 primary data points, while secondary data on palm oil productivity was obtained from PT Bio Nusantara Teknologi. Data obtained from field measurements are numerical data of natural wave recording or seismic signal at each measurement point. The data is processed using Geopsy software so it can be known the price of the dominant frequency (fo), while the shear wave velocity (Vs30) is obtained through USGS data. The result of this research is there is intermediate relationship between sediment thickness to productivity of palm oil with product moment correlation value equal to 0,6392, so that thicker layer of sediment hence higher productivity. The results of this study further used as a source of information contained in the form of LKPD-based service learning to become a learning medium taught by Problem Based Learning (PBL) model on students of class XI SMK N 1 Padang Jaya to know the improvement of students' cognitive learning outcomes in physics learning. The result of research implementation influence of sediment thickness to productivity of palm oil in classroom study showed cognitive learning result of learners experience improvement of cognitive learning result with average value of N-gain of 0,52 (medium criterion).
UPAYA PENINGKATAN SENSITIVITAS NANOPARTIKEL PERAK UNTUK ANALISIS ION MERKURI(II) SECARA CITRA DIGITAL DENGAN PENAMBAHAN NaCl Edo Prasetia; M. Lutfi Firdaus; Elvinawati Elvinawati
ALOTROP Vol 3, No 2 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i2.10120

Abstract

The very small concentration of mercury (Hg) in the environment is difficult to detect, so an accurate and sensitive method is needed in order to detect the concentration. Therefore, the purpose of this study was to develop an accurate and sensitive method based on the use of digital imaging methods and silver nanoparticles (AgNPs) as colorimetric sensors for mercury(II) ions (Hg2+) analysis. The process of making AgNPS is done by a bottom up method involving a reduction reaction. The precursor used is 1 mM AgNO3 solution and as bioreductor is an antioxidant compound present in extract of chili pepper (Capsicum frutescens L) with ratio 1: 9. Contact time variation 15, 30, 45, 60 min and 1, 2, 7 days. Addition of NaCl 0.5 and 1 M NaCl were used to increase the sensitivity of AgNPs as colorimetric sensors of Hg2+ ions. Digital Image Method is used to analyze Hg2+ ions at ppb concentration level. The results of the most optimum silver nanoparticles synthesized at the time of solar heating is 60 minutes. The addition of NaCl 0.5 M and 1 M into AgNPs is able to increase the sensitivity of AgNPs. Limit of Detection (LoD) of AgNPs added NaCl 0.5 M and 1 M was able to detect Hg2 + ions by 3.02 ppb and 2.46ppb.
KAPASITAS ADSORPSI ARANG AKTIF CANGKANG BINTARO (Cerbera odollam) TERHADAP ZAT WARNA SINTETIS REACTIVE RED-120 DAN REACTIVE BLUE-198 Siti Zaya Aisyahlika; M. Lutfi Firdaus; Rina Elvia
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7483

Abstract

The objective of this research was to utilize bintaro shell waste (Cerbera odollam). The morphology of bintaro shell is similar with coconut shell and the contains of lignin and cellulose is higher than coconut. Bintaro shell waste used as activated charcoal to remove environmental pollution caused by synthetic dyes waste of batik industry. The adsorbents were then applied to remove of Reactive Red-120 (RR) and Reactive Blue-198 (RB) dyes in aqueous solution using Visible Spectrophotometer analysis method. Bintaro shell was dried, cut and carbonized at 400°C for 1 hour, then activated with ZnCl2 20% for 24 hours at 27°C and dryed in oven at 105°C for 30 minutes. The activated charcoal of bintaro shell has proven afford to adsorbing RR and RB dyes. The optimum conditions (pH, contact time, adsorbent weight and temperature) were determined to obtain best adsorption capacity. The optimum of conditions for RR occured at pH 2, contact time of 40 minutes and adsorbent weight 100 mg while RB occurred at pH 11, contact time of 60 minutes and adsorbent weight 50 mg and with each the temperature 30°C. At optimum conditions the adsorption isotherm followed Freundlich model with maximum adsorption capacity obtained for RR and RB were 332.6 and 243.9 mg/g, respectively.
PENERAPAN KEMOMETRIK PADA METODE CITRA DIGITAL UNTUK ANALISIS ION MERKURI (II) DENGAN INDIKATOR NANOPARTIKEL PERAK Angga Aprian Dinata; M. Lutfi Firdaus; Rina Elvia
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9049

Abstract

Digital image method in quantitative analysis usually uses one of the RGB primary color components (Red, Green, Blue), so that not all digital image data can be extracted. Then needed a method that can render the whole RGB values as variables in quantitative analysis are known as chemometric. This research aims to know the influence of the application of chemometric against the sensitivity of the digital image. Chemometry method used is the Principal Component Regression (PCR) and Partial Least Square (PLS) using Unscramber X software from Camo software, USA.. This method is applied for the quantitative analysis of Mercury (II) ion with silver nanoparticles (NPP) immobilization on filter paper indicator. The research results showed that chemometric has a good influence against the level of the Limit of Detection (LOD) of the digital image, where the level of LOD with chemometric application of the Principal Component Regression (PCR) is 0.4311 ppb, and Partial Least Square (PLS) is  0.4310 ppb smaller than without the application of chemometric Single Linear Regression (SLR) at 0.837 ppb. 
ANALISIS KADAR MERKURI PADA BIOTA AIR DENGAN NANOPARTIKEL PERAK SECARA CITRA DIGITAL DI LOKASI PENAMBANGAN EMAS KABUPATEN LEBONG Hendry Nordan; Mochamad Lutfi Firdaus; Rina Elvia
ALOTROP Vol 4, No 1 (2020)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v4i1.13695

Abstract

This study aimed at determining of how the sensitivity of silver nanoparticles (NPP) in detecting metal mercury in aquatic biota samples through digital imagery. The Sampling of aquatic biota was carried out in the gold mining location of Lebong Tambang village in Lebong district (102 ° 12'00 "-102 ° 18'05" BT and 3 ° 10'00 "-3 ° 17 ' 00 "LS.) The aquatic biota samples analyzed included fish, shellfish, shrimp and plants as well as comparison samples such as water and sediment. The Analysis of mercury level was carried out from December 2018 - March 2019 by using NPP of digital imagery method. The digital imagery method was used as a detector to replace the conventional spectrophotometer. The result of mercury level in aquatic biota with NPP in digital imagery was susceptible compared to the UV-Vis spectrophotometry method. It can be seen from the Limit Of Detection (LOD) score of the digital imagery method with the SLR data analysis technique by using a digital camera that is equal to 2.305 ppb, where the score was smaller than the LOD value in spectrophotometry which is 300 ppb. The results of the analysis of mercury level by using digital imagery method were obtained the concentration on pool shells of 196.8 ppb, in pond fish samples of 155.7 ppb, in shrimp samples of 81.2 ppb, in river fish samples of 81.1 ppb, and in plant samples of 50.9 ppb. thus, these results indicate that the presence of mercury ions in the samples of aquatic biota tested has levels above the threshold, which means samples of fish, shrimp, shellfish and plants were risk to be consumed
Co-Authors Ahmad Amin Angga Aprian Dinata Budiyanto Budiyanto Dewi Handayani Diana Rakhmawaty Eddy Diya Novarina Edo Prasetia Edwin Saputra Efa Susanti Eko Swistoro Eko Swistoro Eko Swistoro Elvinawati Elvinawati Elvinawati Elvinawati Endang Widi Winarni Endang Widi Winarni Ghufira Ghufira Hadi Apriyonda Hendry Nordan Hermansyah Amir Marti Hitsmi Muchammad Farid Muzanip Alperi Nessi Meileza Nurhamidah Renaldi Adriansyah Rendy W. Wardana Rendy Wikrama Wardana Rima Mayesmy H. Rina Elvia Rince Anugrah Ilahi Riska Marwanti Rosane Medriati Salma Nur Zakiyyah Samitra, Dian Sasti Yuliafitri Septika Amalia Umaro Siti Zaya Aisyahlika Sumpono Sumpono Sura Menda Ginting Wangi Pusva K. Yeni Wahyuni Hartati Yestilia Anggraini Yuni Krisnawati