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All Journal VALENSI Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Jurnal Riset Kimia CHEMPUBLISH JOURNAL Jurnal Pendidikan Kimia Universitas Riau Jurnal Teknologi Mineral dan Batubara Science and Physics Education Journal (SPEJ) CHEESA: Chemical Engineering Research Articles JURNAL PENDIDIKAN TAMBUSAI Eksakta : Berkala Ilmiah Bidang MIPA JKPK (Jurnal Kimia dan Pendidikan Kimia) 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
Ngatijo Ngatijo
Departement Of Chemistry, Faculty Of Science And Technology, Universitas Jambi Jl. Jambi-Ma Bulian Km. 15, Mendalo Darat, Jambi, 36361, Indonesia
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 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

Abstract

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

Abstract

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

Abstract

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. 
Pembuatan Lahan Percontohan Tanaman Padi (Oriza Sativa L.) melalui Recovery Logam Berat Ngatijo Ngatijo; Nuryono Nuryono; F Faried; Ummi Mardiyah Batubara; S M Ula; I P Sari
CHEMPUBLISH JOURNAL Vol. 2 No. 2 (2017): Chempublish Journal
Publisher : Universitas Jambi, Fakultas Sains dan Teknologi, Program Studi Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (186.924 KB) | DOI: 10.22437/chp.v2i2.4513

Abstract

Telah dilakukan sintesis material amonium kuaterner hibrida silika (AKHS) dari abu sekam padi (ASP) sebagai prekursor silika. Proses modifikasi silika dengan gugus amin digunakan 3-aminopropriltrimetoksisilan (3-APTMS) untuk membentuk silika termodifikasi amin (STA). Proses reaksi metilasi digunakan metil iodida dengan pelarut dimetil formamida (DMF) dan toluena, sehingga terbentuk material AKHS. Karakterisasi dilakukan dengan spektroskopi infra merah (FTIR) dan difraksi sinar-X (XRD). Morfologi permukaan dan komposisi unsur diidentifikasi dengan SEM-EDX. Pengaruh pH larutan diperoleh pada pH optimum untuk ion Au(III) dan Hg(II) berturut-turut pada pH 3 dan 5. Logam berat mempengaruhi pertumbuhan padi (Oriza Sativa L.) pada lahan bekas penambangan emas.
Nanofikasi Fraksi Tanah Gambut untuk Modifikator Nanomagnetit/AH-Kitosan sebagai Kandidat Penanggulangan Pencemaran Zat Warna Ngatijo Ngatijo; Restina Bemis; Mahya Ihsan; Nurul Gusmaini; Salim Hidayat; Rahmat Basuki
CHEMPUBLISH JOURNAL Vol. 5 No. 2 (2020): Chempublish Journal
Publisher : Universitas Jambi, Fakultas Sains dan Teknologi, Program Studi Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/chp.v5i2.11105

Abstract

The nanomagnetite/HA-Chitosan adsorbent has been successfully synthesized by the co-precipitation method. HA was synthesized from the peat soils of Geragai village, Tanjung Jabung Timur, Jambi province and chitosan isolated from marine animal shell waste around the city of Jambi. The results of FT-IR analysis showed that nanomagnetite/AH-chitosan has a spectra which was combination of the characteristic spectra of magnetite, HA and chitosan. Morphological analysis using SEM showed that nanomagnetite/AH-chitosan was in the form of fractal agglomerates. TEM image of magnetite/AH-chitosan showed that magnetite/AH-chitosan has nano scale magnetite core particles with a size between 4-22 nm. Crystallinity analysis showed that magnetite/AH-chitosan has 2θ characteristics of magnetite i.e., 30.1°, 35.4°, 43.1°, 57.0°, 62.68° and 74.5°. The magnetic saturation strength (Ms) decreased from 80.23 (magnetite) to 30.63 (magnetite/AH-chitosan) due to the coating of AH-chitosan on magnetite which was still effectively attracted by the external magnet with 96% effectiveness of adsorption of 25 mL Methylene Blue 10 mg/L.
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

Abstract

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

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (891.726 KB) | DOI: 10.24036/eksakta/vol22-iss4/284

Abstract

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.
Remazol Briliant Blue Uptake by Green and Low-Price Black Carbon from Ilalang Weeds (Imperata cylindrica) Activated by KOH Solution Ngatijo Ngatijo; Edwin Permana; Lusi Pitri Yanti; Bayu Ishartono; Rahmat Basuki
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 6, No 2 (2021): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v6i2.53113

Abstract

Synthesis of activated carbon (AC) from green, low-price, and renewable source as a pollutant adsorbent is growing interest of researcher. This work aims to synthesis of AC from Ilalang weed (Imperata cylindrica) (IW-AC) with KOH activator as a green and low price Remazol Brilliant Blue dye (RBB) adsorbent. The success IW-AC synthesis was evidently characterized by Fourier Transform-Infrared (FT-IR) and Scanning Electron Microscopy (SEM). The effects of initial solution pH, adsorbent dosage, initial RBB concentration, and contact time were systematically investigated. Results showed the optimum condition of RBB adsorption was occurred at low pH (2.0-4.0) and 75 mg of adsorbent dosage. Under the optimum condition, the equilibrium adsorption data fitted well to the Langmuir isotherm with the adsorption capacity of RBB uptake was 13.42 mg/g. Calculation of adsorption energy by Dubinin-Radushkevich (D-R) isotherm model (13.39 kJ/mol) showed that the electrostatic interaction was the main interaction of RBB adsorption on IW-AC. Adsorption kinetics showed that the adsorption behavior followed the Ho pseudo-second-order kinetic model. The experimental results of this work demonstrate that the IW-AC can be used as a promising green and low-cost adsorbent for removal of anionic dyes from aqueous solution.
Adsorpsi Methylene Blue pada Nanopartikel Magnetit tersalut Asam Humat: Kajian Isoterm dan Kinetika Ngatijo Ngatijo; Nurul Gusmaini; Restina Bemis; Rahmat Basuki
CHEESA: Chemical Engineering Research Articles Vol 4, No 1 (2021)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v4i1.8433.51-64

Abstract

Nanopartikel magnetit merupakan suatu material dengan sifat magnet yang stabil dan memiliki luas permukaan tinggi. Penyalutan nanopartikel magnetit dengan asam humat (AH) dilaporkan dapat meningkatkan stabilitas, kapasitas adsorpsi, dan kemudahan pemisahan pasca adsorpsi. Penelitian ini bertujuan untuk melakukan sintesis Nanopartikel Magnetit tersalut Asam Humat (NpMAH) dengan metode ko-presipitasi dan menentukan parameter adsorpsinya sebagai adsorben Methylene Blue (MB) dengan metode batch. Keberhasilan sintesis ditunjukkan oleh karakterisasi NpMAH dengan FT-IR, XRD, SEM, dan VSM. Parameter isoterm adsorpsi mengindikasikan bahwa adsorpsi terjadi secara lapis tunggal dengan kapasitas adsorpsi sebesar 56,96 mg/g dan energi adsorpsi sebesar 26,31 kJ/mol pada pH optimum 6,0. Parameter kinetika menunjukkan bahwa adsorpsi mengikuti model kinetika Ho (pseudo orde kedua) dengan konstanta laju adsorpsi (kHo) sebesar 12688,71 g/molmenitdan perhitungan MB yang teradsorpsi pada kesetimbangan (qe) sebesar 2,96×10-5 mol/g. Perhitungan energi adsorpsi menggunakan model kinetika Santosa dan RBS berturut-turut 25,67 kJ/mol dan 41,25 kJ/mol.
Co-Authors Ahmat Munawir Siregar Aslan Irunsah Asrial Bayu Ishartono Bayu Ishartono Damris Muhammad Danawati Hari Prajitno Defia Indah Permatasari Edwin Permana Eko Supriadi F Faried Faizar Farid Helga Dwi Fahyuan Herijon Muhammad Syahril Heriyanti Heriyanti Hertanti Kusuma Wardani I P Sari Intan Lestari Ira Galih Prabasari Ira Kusuma Dewi, Ira Kusuma Leny Marlinda Lusi Pitri Yanti Magdalena Ritonga Mahfud Mahfud Mahya Ihsan Mardhotillah, Bunga Muhaimin Muhaimin Muhammad Ikrar Lagowa Nashih Ulwan Niza Desiana Nurul Gusmaini Nuryono Nuryono Putri Mutia Rahmat Basuki Rahmat Basuki Rahmi Rahmi Ratih Dyah Puspitasari Restina Bemis S M Ula Safira Rahmi Salim Hidayat Ummi Mardiyah Batubara Wayan Angga Dewi Wibowo, Yudha Gusti Winda Arinda Putri Yonanda Ramadhanty