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All Journal VALENSI Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Jurnal Riset Kimia Jurnal Litbang Industri Jurnal Pendidikan Kimia Universitas Riau Jurnal Teknologi Mineral dan Batubara Science and Physics Education Journal (SPEJ) JURNAL PENDIDIKAN TAMBUSAI Eksakta : Berkala Ilmiah Bidang MIPA REACTOR : Journal of Research On Chemistry And Engineering JIFP (Jurnal Ilmu Fisika dan Pembelajarannya) Journal of Applied Agricultural Science and Technology Journal of The Indonesian Society of Integrated Chemistry Jurnal Teknologi Mineral dan Batubara

Ngatijo Ngatijo

Departement Of Chemistry, Faculty Of Science And Technology, Universitas Jambi Jl. Jambi-Ma Bulian Km. 15, Mendalo Darat, Jambi, 36361, Indonesia

Author-ID : 2589538

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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Synthesis and Characterization of Nano-sized Carbonated Calcium Hydroxyapatite (CHAp) from Rebon shrimp (Acetes erythraeus) as a Candidate for Dental Restoring Application Ngatijo Ngatijo; Restina Bemis; Heriyanti Heriyanti; Rahmi Rahmi; Nashih Ulwan; Rahmat Basuki
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 7, No. 2, November 2021
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v7i2.21359

Carbonated calcium hydroxyapatite (CHAp) exhibits excellent biocompatibility with bone and teeth, making it an ideal candidate for orthopedic and dental application. However, the study of CHAp synthesis from natural material is still scarce. The purpose of this research is to synthesize and characterize of CHAp, using Rebon shrimp (Acetes erythraeus) as a calcium source. The synthesis was conducted by hydrothermal method with the variation of Ca/P ratios 1.61; 1.67; 1.73. The as-prepared CHAp was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy-energy dispersive X-ray (SEM-EDX). The FT-IR results show that synthesized material exhibited characteristic CHAp band of hydroxide at 3448 and 1635 cm-1, carbonate at 872 and 1427 cm-1, and phosphate at 1049; 606; and 570 cm-1. The diffractogram pattern assigned the all observed peak of CHAp are in good agreement compared to CHAp database with the nano-scale size. It also observed that the high Ca/P ratio will decrease the crystallinity of CHAp. The as-prepared CHAp micrograph is agglomerates spherical form with size between 5-20 nm which build up from 18–26 nm crystallite particles. The result of this research confirmed that Rebon shrimp is the promising materials for calcium source in CHAp production.

Pengaruh Doping Ca dan K pada γ-Al2O3 terhadap Sifat Fisik Katalis pada Transesterifikasi Minyak Kelapa Eko Supriadi; Danawati Hadi Prajitno; Mahfud Mahfud; Ngatijo Ngatijo; Rahmat Basuki
REACTOR: Journal of Research on Chemistry and Engineering Vol 2, No 1 (2021): Published in June 2021
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v2i1.20

Metal doping plays important role in increasing catalytic activity of catalyst materials. In this work, Ca and K were doped to the γ-Al2O3 by dry impregnation method to study the crystallinity, surface area, activation energy, and yield in the coconut oil transesterification reaction. The success of doping was shown in the characterization of Ca/γ-Al2O3 and K/γ-Al2O3 using X-Ray Diffraction (XRD) which increasing in crystallinity from 62.2% (γ-Al2O3) to 69.3 (K/γ-Al2O3) and 76.0 (Ca/γ-Al2O3). The emerging peak of 2θ characteristics of K (29.70° and 32.65°) and Ca (25.35°, 26.77°, and 27.17°) on the γ-Al2O3 (37.66°, 45.82° and 67.22 °) was also observed. Characterization by the Surface Area Analyzer (SAA) shows that the K/γ-Al2O3 catalyst has a smaller surface area (34.03 m2/g) than Ca/γ-Al2O3 (83.77 m2/g), but a higher pore diameter (66.12 Å) than Ca/γ-Al2O3 (35.22 Å). The K/γ-Al2O3 catalyst produced greater FAME yield (93.19%) than Ca/γ-Al2O3 (29.76%) at a catalyst concentration of 2.5%, reaction time 150 s, and ultrasonic frequency of 40 kHz. The quality of the FAME catalyzed by K/γ-Al2O3 fulfills four test parameters: density, kinematic viscosity, flash point, and pour point according to SNI 04-7182-2006 standards.

Black Water Purification by Activated Carbon from Ilalang Weeds (Imperata cylindrica) Adsorbent in Peatland Rural Area Ngatijo Ngatijo; Heriyanti Heriyanti; Winda Arinda Putri; Aslan Irunsah; Bayu Ishartono; Rahmat Basuki
Jurnal Riset Kimia Vol. 13 No. 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.449

The black water containing humic acid, HA in peat land rural area is a serious issue. This study aims to synthesis of activated carbon, AC from Ilalang Weeds, IW (Imperata cylindrica) as low-cost adsorbent for HA. The success AC synthesis by H3PO4 activator from IW was evidently characterized by Fourier Transform Infra-Red, FTIR and Scanning Electron Microscopy, SEM. The effects of pH solution, initial HA concentration, and contact time were systematically studied to investigate the performance of Activated Carbon from Ilalang Weeds, ACIW. The results showed the increasing of Langmuir monolayer capacity of HA adsorption on carbon from IW before (49.75 mg g-1) and after (56.82 mg g-1) activation process at the pH optimum 6.0. The equilibrium adsorption data fitted with the isotherm model was shifted from multilayer Freundlich model (CIW) into monolayer Langmuir model as the consequences of increasing pore diameter size and active sites intensity. Calculation of adsorption energy by Dubinin-Radushkevich (EDR) model, 0.50 and 2.24 kJ mol-1 for CIW and ACIW, respectively, showed the increasing of physical affinity of HA with the active sites of adsorbent. Adsorption kinetics showed that the adsorption behavior followed the Ho pseudo-second-order kinetic model. The experimental results of this work demonstrate that the ACIW can be used as a promising low-cost adsorbent for HA removal for clean water production in peat land rural area.Â

PENGARUH MODEL INKUIRI TERBIMBING DAN MOTIVASI TERHADAP KETERAMPILAN PROSES SAINS SISWA PADA MATERI KOLOID Ngatijo Ngatijo; Intan Lestari; Wayan Angga Dewi
Jurnal Pendidikan Kimia Universitas Riau Vol 7, No 1 (2022)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan (FKIP), Universitas Riau (UNRI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33578/jpk-unri.v7i1.7812

Penelitian ini bertujuan untuk melihat pengaruh model inkuiri terbimbing dan motivasi terhadap keterampilan proses sains siswa pada materi koloid. Penelitian ini merupakan penelitian quasi eksperimen dengan menggunakan desain faktorial 2 x 2. Penelitian ini telah dilaksanakan pada kelas XI IPA SMAN 1 Bayung Lencir. Teknik pengambilan sampel adalah simple random sampling, sampel yang digunakan sebanyak dua kelas, satu kelas eksperimen dan satu kelas kontrol. Sumber data berasal dari angket motivasi, soal test keterampilan proses sains, dan lembar observasi. Teknik analisis data menggunakan analysis of variance (ANOVA dua jalur). Hasil penelitian menunjukkan, motivasi belajar siswa berpengaruh terhadap keterampilan proses sains siswa pada materi koloid, begitu juga dengan kelas eksperimen yang menggunakan model pembelajaran inkuiri terbimbing, hasil nilai test pada kelas eksperimen lebih tinggi dibandingkan dengan kelas kontrol. Hasil penilaian lembar observasi juga menunjukkan rata-rata pada kelas eksperimen lebih tinggi dibandingkan kelas kontrol. Kesimpulan yang didapat adalah terdapat pengaruh model inkuiri terbimbing dan motivasi terhadap keterampilan proses sains siswa pada materi koloid dan terdapat interaksi antara model inkuiri terbimbing dan motivasi terhadap keterampilan proses sains siswa pada materi koloid.

PENGELOLAAN AIR LIMBAH TAMBANG DENGAN METODE BIOADSORBSI MENGGUNAKAN KARBON AKTIF TEMPURUNG KELAPA Niza Desiana; Ngatijo Ngatijo; Mohammad Ikrar Lagowa
Jurnal Teknologi Mineral dan Batubara Vol 18, No 2 (2022): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2022
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol18.No2.2022.1175

Air limbah tambang merupakan dampak dari kegiatan penambangan. Salah satu metode pengelolaan air limbah tambang yang belum banyak dikaji adalah bioadsorbsi menggunakan karbon aktif tempurung kelapa. Penelitian ini bertujuan mengetahui pengaruh bioadsorbsi karbon aktif tempurung kelapa terhadap pH, Fe, Mn dan TSS pada air limbah tambang. Digunakan metode eksperimen dengan 2 variabel, yaitu konsentrasi karbon aktif dan waktu kontak. Dari hasil penelitian didapatkan bahwa karbon aktif tempurung kelapa yang diaktivasi H3PO4 20%, mengandung unsur karbon sebesar 98,20%, air 9,75%, zat menguap 20,52%, abu 10,02% dan karbon terikat 69,46 %. Hasil optimal peningkatan pH didapatkan pada konsentrasi karbon aktif 5 g/L dengan waktu kontak 10 menit yaitu pH 7,01. Penurunan konsentrasi Fe dan Mn yang terbaik diperoleh ketika menggunakan karbon aktif 5 g/L dan waktu kontak 60 menit dan 20 menit sehingga didapatkan konsentrasi Fe 0,3570 mg/L dan Mn 0,0344 mg/L serta penurunan TSS yang optimal menjadi 0,078 mg/L. Karbon aktif tempurung kelapa terbukti mampu meningkatkan pH serta menurunkan konsentrasi Fe, Mn dan kadar TSS sehingga dapat dijadikan salah satu alternatif pengelolaan air limbah tambang.

Preparation and Characterization of Magnetite Fe3O4-Activated Carbon Composite as Adsorbent Cr(VI) Ion Intan Lestari; Yonanda Ramadhanty; Leny Marlinda; Ngatijo Ngatijo
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 4 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Metal ion such as Cr(VI) is one toxic heave metal at the trace level, thus it is necessary to remove metal ion Cr(VI) ion environmental. The absorption of Cr(VI) ions was carried out using a Fe3O4 magnetite activated carbon composite. Activated carbon prepare from palm shells (Elaeis guinensis Jack) was composite with magnetite Fe3O4 by co-precipitation method. Magnetite Fe3O4-activated carbon composite is characterized by SEM, VSM and XRD. SEM image show that Fe3O4 a deposit on the surface of activated carbon. The degree of magnetization of Fe3O4 with VSM obtained 20.99 emu/g. The pattern of XRD diffractogram show that diffraction peak at 2θ which was 6.5495o; 30.1146o; 35.3581o; 43.063o; 57.1369o; 62.5918o. The spectra of FTIR show that functional groups exist in composites such as carboxyl, carbonyl and hydroxyl groups. Adsorption of Cr(VI) ion occurs at pH 5, contact time is 30 minutes and a maximum concentration of 200 mg/L Cr(VI) with a maximum adsorption capacity was 43.4 mg/g.

Identifikasi Batuan Granit Daerah Prospek Panas Bumi Nyelanding menggunakan Metode Magnetik Ahmat Munawir Siregar; Ira Kusuma Dewi; Ngatijo Ngatijo
SPEJ (Science and Physic Education Journal) Vol 4 No 2 (2021): SPEJ (Science and Physic Education Journal)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/spej.v4i2.2388

This study aimed to identify granite rocks around the Nyelanding geothermal area, especially in the geothermal manifestations. This research used the magnetic method to analyze the subsurface structure of the geothermal area. Correction of magnetic data was performed in Microsoft excel 2010 software and two-dimensional modeling was performed using Oasis Montaj 8.4. The results showed that there are three layers of rock under Nyelanding hot springs, namely granite with a susceptibility of 0.009 - 0.05 SI to a depth of 500 meters and a layer of sandstone - clay, as well as layers of clay, gravel and silt with a susceptibility of 0.00001 - 0, 00005 SI. In conclusion, the local geology of the Nyelanding hot spring area is dominated by the presence of granite to a depth of 500 meters. The results of forward modeling on layers A-A' and C-C' show the subsurface structure of Nyelanding hot springs in the form of a granite rock basin which is estimated to be able to accumulate geothermal energy. Key words: Nonvolcanic Geothermal, Magnetic Method, Granite Susceptibility, Forward Modeling

Pengaruh Jenis Serat Alam Terhadap Koefisien Absorpsi Bunyi Sebagai Peredam Kebisingan Putri Mutia; Ngatijo Ngatijo; Helga Dwi Fahyuan
Jurnal Ilmu Fisika dan Pembelajarannya (JIFP) Vol 3 No 1 (2019): Jurnal Ilmu Fisika dan Pembelajarannya (JIFP)
Publisher : Program Studi Pendidikan Fisika, UIN Raden Fatah Palembang

Telah dilakukan penelitian mengenai pengaruh jenis serat alam yang berbeda yaitu serat ampas tebu, serat sabut kelapa dan serat buah bintaro terhadap koefisien absorpsi bunyi dengan menggunakan metode tabung impedansi. Sampel yang digunakan yaitu material akustik dengan massa serat 0,3 gr. Rentang frekuensi yang digunakan adalah 500, 1000, 2000 dan 4000 Hz. Hasil penelitian menunjukkan bahwa semakin kecil ukuran partikel serat maka semakin tinggi nilai koefisien absorbs bunyi dan semakin tinggi tingkat porositas permukaan sampel yang digunakan maka semakin tinggi nilai koefisien absorpsi bunyipada material komposit serat ampas tebu dengan massa 0,3 gr dan serat sabut buah kelapa dengan massa 0,3 gr frekuensi 500 Hz. Densitas material dengan kerapatan yang baik digunakan berkisar 0,4 gr/cm3 – 0,9 gr/cm3, penelitian ini menghasilkan nilai densitas yang tinggi =1,29 gr/cm3. Hal tersebut didukung oleh jumlah matriks yang cukup banyak yaitu 20 gr sehingga menghasilkan kerapatan yang tinggi, koefisien serapan material komposit yang memiliki permukaan berpori dan selaput sebagai jalur keluar masuknya udara sehingga meningkatkan nilai koefisien absorpsi.

Pengaruh Model Pembelajaran Problem Based Learning dan Jenis Kelamin terhadap Kemampuan High Order Thinking Skills (HOTS) Peserta Didik SMA Negeri 1 Kecamatan Payakumbuh Safira Rahmi; Ngatijo Ngatijo; Asrial Asrial
Jurnal Pendidikan Tambusai Vol. 6 No. 2 (2022): Agustus 2022
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Penelitian ini telah dilakukan dengan judul “Pengaruh model pembelajaran Problem Based Learning (PBL) dan jenis kelamin terhadap kemampuan high order thinking skills (HOTS) peserta didik SMA Negeri 1 Kecamatan Payakumbuh”. Penelitian ini dilakukan untuk mengetahui model pembelajaran PBL berpengaruh terhadap kemampuan HOTS peserta didik SMA Negeri 1 Kecamatan Payakumbuh, jenis kelamin berpengaruh terhadap kemampuan HOTS peserta didik SMA Negeri 1 Kecamatan Payakumbuh, dan antara model pembelajaran PBL dan jenis kelamin terjadi interaksi terhadap kemampuan HOTS peserta didik SMA Negeri 1 Kecamatan Payakumbuh. Metode penelitian ini adalah metode eksperimen semu. Sampel yang digunakan 2 kelas dengan pengambilan sampel acak sederhana dan desain faktorial 2 x 2 serta teknik olah data menggunakan Analisis varian (ANOVA) dua jalur. Hasil penelitian menunjukkan bahwa model PBL berpengaruh terhadap kemampuan HOTS peserta didik SMA Negeri 1 Kecamatan Payakumbuh, jenis kelamin tidak memiliki pengaruh terhadap kemampuan HOTS peserta didik SMA Negeri 1 Kecamatan Payakumbuh, dan pada model PBL dan jenis kelamin tidak berinteraksi terhadap kemampuan HOTS peserta didik SMA Negeri 1 Kecamatan Payakumbuh.

Decontamination of Mercury from Mined Soil using Magnetite Functionalized Quaternary Ammonium Silica (Fe3O4/SAK) Ngatijo Ngatijo; Defia Indah Permatasari; Faizar Farid; Restina Bemis; Heriyanti Heriyanti; Rahmat Basuki; Yudha Gusti Wibowo
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 18, No 1 (2021): March 2021
Publisher : Universitas Diponegoro

Artisanal small-scale gold mining (ASCGM) has caused mercury contamination. However, efforts to decontaminate mercury from the ex-mining soils are still rare. This study aims to synthesize quaternary ammonium silica functionalized magnetite (Fe3O4/SAK) as a low price, highly available, and quickly separated adsorbent for mercury decontamination from ex-mining soils samples. The synthesis of Fe3O4/SAK and the mercury decontamination process was carried out by the co-precipitation and batch type reactor procedure, respectively. The Fourier Transform-Infra Red (FT-IR) characterization of synthesized Fe3O4/SAK informed the appearance of siloxane, silanol, methyl, methylene, and Fe-O functional groups. Crystal analysis by X-Ray Diffraction (XRD) showed that the typical peaks of SiO2 and Fe3O4 were emerged at 2θ 22.8˚ and 35.52˚, respectively. Morphological studies and elemental analysis using Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX) indicated the successful functionalization Fe3O4 by SAK in the transformation of surface morphology and composition of the main elements, namely C, O, Si, and Fe. The results of characterization using Surface Area Analyzer (SAA) showed that the surface area and pore diameters were 224.98 m2/g and 36.149-38.70 Å, respectively. The optimum results for adsorbing Hg22+ metal ions were obtained at pH 4.0, and the adsorbent mass was 0.1 g. The Fe3O4/SAK has been proven to be an easily separable adsorbent after the mercury decontamination process in ex-mining soil samples with an adsorption efficiency of 43.36% (0.722 mg/g).

Co-Authors Ahmat Munawir Siregar Aslan Irunsah Asrial Bayu Ishartono Bayu Ishartono Damris Muhammad Danawati Hari Prajitno Defia Indah Permatasari Edwin Permana Eko Supriadi Faizar Farid Helga Dwi Fahyuan Herijon Muhammad Syahril Heriyanti Heriyanti Hertanti Kusuma Wardani Intan Lestari Intan Lestari Ira Galih Prabasari ira kusuma dewi Leny Marlinda Lidia Herlina Lusi Pitri Yanti Mahfud Mahfud Mardhotillah, Bunga Muhaimin Muhaimin Muhammad Ikrar Lagowa Nashih Ulwan Niza Desiana Putri Mutia Rahmat Basuki Rahmi Rahmi Ratih Dyah Puspitasari Restina Bemis Ritonga, Magdalena Safira Rahmi Salmariza sy Wayan Angga Dewi Wibowo, Yudha Gusti Winda Arinda Putri Yonanda Ramadhanty

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