Garuda - Garba Rujukan Digital

All

Science and Technology Indonesia

JSTI
Website

Published by Universitas Sriwijaya

ISSN : 25804405 EISSN : 25804391 DOI : -

Core Subject : Science, Social, Engineering,

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Environmental Science Materials Science & Nanotechnology Physics

An international Peer-review journal in the field of science and technology published by The Indonesian Science and Technology Society. Science and Technology Indonesia is a member of Crossref with DOI prefix number: 10.26554/sti. Science and Technology Indonesia publishes quarterly (January, April, July, October). Science and Technology Indonesia is an international scholarly journal on the field of science and technology aimed to publish a high-quality scientific paper including original research papers, reviews, short communication, and technical notes. This journal welcomes the submission of articles that covers a typical subject of natural science and technology such as: > Chemistry > Biology > Physics > Marine Science > Pharmacy > Chemical Engineering > Environmental Science and Engineering > Computational Engineering > Biotechnology Journal Commencement: October 2016

Arjuna Subject : -

Articles 301 Documents

1 2 3 4 5

Preparation of calcium oxide from cattle bones as catalyst for conversion of waste cooking oil to biodiesel Sabat Okta Ceria Sitompul; Risfidian Mohadi
Science and Technology Indonesia Vol. 2 No. 3 (2017): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Preparation of calcium oxide from cattle bones by thermal decomposition for 3 hours using various temperature at 400°, 500°, 800°, 900°, 1000°, and 1100°C. Calcium oxide was characterized using X-Ray Diffractometer. The results of XRD pattern showed of diffraction similar to CaO standard from JCPDS at 2θ: 32.2°; 37.3°; 53.8°; 64.1° and 67.3°. The CaO from heating cattle bones at 1000°C resulting of 2θ: 32.3°; 53.8° and 64.1°. Then, the metal oxide was characterized by FT-IR which showed the existence of CaO at wave number 362.2 cm-1 from CaO vibration. The CaO from cattle bones applied as catalyst on biodiesel synthesis from waste cooking oil and resulting viscosity value of biodiesel 5.93 cSt, density 0.876 g/cm3, acid value 0.561 mg/KOH and iod number value 16.92 g/100 g, respectively all in the range of SNI standard. Keywords: cattle bones, calcium oxide, catalyst, biodiesel, waste cooking oil.

Mg/Al double layer hydroxides: intercalation with H3[α-PW12O40]•nH2O Yuliza Hanifa; Neza Rahayu Palapa
Science and Technology Indonesia Vol. 1 No. 1 (2016): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

It has been done the intercalation of polyoxometalate H3[α-PW12O40]•nH2O on Mg-Al double layer hydroxide by comparison weight ratio of double layer hydroxides : polyoxometalate H3[α-PW12O40]•nH2O, i.e: 1:1, 1:2, 1:3 and 1: 4. The product of intercalated double layer hydroxide was characterized using FT-IR spectrophotometer, XRD, and TG-DTA analysis. The spectrophotometer results of FT-IR shown the process of intercalation was not optimum for every weight ratio. Characterization using XRD showed the process of intercalation was optimum at a ratio 2:1 that indicated at the area of 11,12o, 22,85o and 34,5o as double layer hydroxide and at the area of 60-63o showed the double layer hydroxide has intercalated with polyoxometalate. The characterization results using TG-DTA analysis at the comparison 2:1 showed loss of OH in the layer at 170 to 220°C and for the decomposition of polyoxometalate H3[α-PW12O40]•nH2O at 300 to 400°C. Keywords: Double Layer Hydroxide, Intercalation, Polyoxometalate H3[α-PW12O40]·nH2O

Synthesis and characterization of metal oxides supported keggin type polyoxometalate Rb2K2[-H2SiV2W10O40].nH2O Eiffel Ostan Jeski Gultom; Aldes Lesbani
Science and Technology Indonesia Vol. 2 No. 2 (2017): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Synthesis of material based on polyoxometalate Rb2K2[γ-H2SiV2W10O40].nH2O with SiO2, TiO2, ZrOCl2, and TaCl5 was carried out to form Rb2K2[γ-H2SiV2W10O40].nH2O-SiO2, Rb2K2[γ-H2SiV2W10O40].nH2O-TiO2 Rb2K2[γ-H2SiV2W10O40].nH2O-ZrOCl2 and Rb2K2[γ-H2SiV2W10O40].nH2O-TaCl5. Materials from preparation were characterized through functional group analysis using FT-IR spectrophotometer, crystallinity analysis using XRD and surface photograph analysis using SEM. The results show that material Rb2K2[γ-H2SiV2W10O40].nH2O was successfully loaded with SiO2, ZrOCl2 and TaCl5. Based on SEM photo Rb2K2[γ-H2SiV2W10O40].nH2O-TiO2 and Rb2K2[γ-H2SiV2W10O40].nH2O-ZrOCl2 were the best material from preparation base on the homogeneity particle distribution. The FT-IR spectrum shows specific wavenumber for nanomaterial Rb2K2[γ-H2SiV2W10O40].nH2O-TiO2 in the range 455-910 cm-1 and Rb2K2[γ-H2SiV2W10O40].nH2O - ZrOCl2 in the range 393.48-1404 cm-1. XRD pattern for material Rb2K2[γ-H2SiV2W10O40].nH2O-TiO2 and Rb2K2[γ-H2SiV2W10O40].nH2O-ZrOCl2 show there is a difference between polyoxometalate Rb2K2[γ-H2SiV2W10O40].nH2O, TiO2 and ZrOCl2. SEM photo analysis of Rb2K2[γ-H2SiV2W10O40].nH2O-TiO2 and Rb2K2[γ-H2SiV2W10O40].nH2O-ZrOCl2 showed that material polyoxometalate with support has a diameter size of particle above 100 nm. Keywords: Rb2K2[γ-H2SiV2W10O40].nH2O, polyoxometalate, SiO2, TaCl5, TiO2, ZrOCl2.

Preparation, characterization, and thermal stability of B2O3-SiO2 Winda Fitriana; Aldes Lesbani
Science and Technology Indonesia Vol. 2 No. 1 (2017): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Preparation of B2O3-SiO2 compound by inorganic synthesis was carried out. B2O3-SiO2 was characterized by FT-IR spectro-photometer, analysis of crystallinity by XRD, and test of acidity. B2O3-SiO2 was also tested by thermal stability with temperature range at 300-700 ⁰C. The results showed that the FT-IR spectrum of B2O3-SiO2 has some vibrations of B-O, Si-O-Si, Si-O-B stretching, and Si-O-B bending at 1442.8 cm-1, 779.2 cm-1, 925.8 cm-1, and 648.1 cm-1. The X-Ray diffraction pattern results showed that the analysis of B2O3-SiO2 has high crystallinity with two peaks diffraction identified at 26.6⁰ and 20.9⁰. The thermal stability test of B2O3-SiO2 showed that B2O3-SiO2 has high thermal stability with temperature range at 300-700 ⁰C. The results showed that the acidity analysis of B2O3-SiO2 has potential number 122.71 mV so that indicated B2O3-SiO2 was high acidity. Keywords : boric oxide, silica dioxide, boric silica, B2O3-SiO2

Conversion of cyclohexane to cyclohexanol and cyclohexanone using H3[PMo12O40].nH2O-ZrOCl2 as catalyst Eriza Sativa; Aldes Lesbani
Science and Technology Indonesia Vol. 2 No. 3 (2017): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Synthesis and preparation polyoxometalate compound H3[-PMo12O40].nH2O supported with ZrOCl2 at various weights of ZrOCl2 i.e. 0.25 g, 0.50 g, 0.75 g, 1.00 g, 1.25 g, 0.01 g and 0.05 g to form H3[-PMo12O40].nH2O/ZrOCl2 have been conducted. These compound than was characterized through functional group analysis using FT-IR spectrophotometer and XRD analysis. The results showed that the optimal preparation was H3[-PMo12O40].nH2O/ZrOCl2 with support 0.05 g. FT-IR spectrum of H3[-PMo12O40].nH2O/ZrOCl2 show wavenumber at 1033.85 cm-1 for vibration P-O, 887.26 cm-1 for vibration M=O, 840.96 cm-1 and 655.80 cm-1 for vibration Mo-O-Mo. The existence of support was identified at wavenumber 1404.18 cm-1for vibration Zr-OH and 478.35 for vibration Zr-O-Zr. XRD powder analysis showed that material H3[-PMo12O40].nH2O/ZrOCl2 was amorphous material. Material H3[-PMo12O40].nH2O/ZrOCl2 was applied in oxidation of cyclohexane using hydrogen peroxide as oxidant. Oxidation process was optimized through reaction time H2O2 amount, temperature and catalyst weight. The results showed that the highest conversion in the using of H3[-PMo12O40].nH2O/ZrOCl2 catalyst found at 2 hours reaction time, 3 mL H2O2, 80oC temperature and 0.038 g catalyst with conversion 99.18 %. Selectivity of best reaction was 6.96 % for cyclohexanol and 24.9% for cyclohexanone, which was identified by GC-MS. Keywords : H3[-PMo12O40].nH2O-ZrO2,cyclohexane, cyclohexanol, cyclohexanone.

Organometallic [Fe3O(OOCC6H5)6(H2O)3](NO3) as intercalant of bentonite Hasja Paluta Utami; Donny Marihot Siburian
Science and Technology Indonesia Vol. 1 No. 1 (2016): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Intercalation of organometalic compounds [Fe3O(OOCC6H5)6(H2O)](NO3)∙nH2O on bentonite by weight ratio of bentonite:organometallic (1 : 1); (1 : 2); (1 : 3); and (1 : 4) has been carried out. The intercalation bentonite was characterized using FT-IR spectrophotometer, XRD and XRF anayses. Characterization using FT-IR spectrophotometer showed higher intensity of peak wavenumber at 470.6 cm-1 for Fe3-O vibration on the ratio (1 : 3). While XRD characterization showed the shift of diffraction angle of 2θ was 5.2° and has bacal spacing of 16.8 Ǻ. In the XRF characterization, the intercalation process of organometalic compounds [Fe3O(OOCC6H5)6(H2O)](NO3)∙nH2O on bentonite was occurred optimally with percentage of metal oxide reached 71.75 %. Keywords: intercalation, bentonite, organometallic, [Fe3O(OOCC6H5)6(H2O)](NO3)∙nH2O.

Preparation, characterization, and thermal stability of B2O3-ZrO2 Theresia Debora Simbolon; Risfidian Mohadi
Science and Technology Indonesia Vol. 2 No. 2 (2017): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Synthesis of the borate-based compound with ZrOCl2 to form B2O3-ZrO2 has been conducted. The compound was characterized by FT-IR spectrophotometer, X-ray diffraction, acidity and thermal stability test. The results showed that the FT-IR main vibration spectrum of B2O3-ZrO2 compound has appeared at wave number 401.2 cm-1 for Zr-O bonding vibration, 617.2 cm-1 for B-O-B bonding vibration and 910.4 cm-1 for B-O bonding vibration. The XRD diffraction pattern shows B2O3-ZrO2 compound has an amorphous structure. The FT-IR spectrum after saturated with ammonia and potentiometric titration indicates that the compound of B2O3-ZrO2 has acidic properties with a strong level of acidity. Thermal stability test shows that the B2O3-ZrO2 compounds have high stability on temperature with increasing crystallinity after the compound was heated at 700 °C. Keywords: B2O3-ZrO2, impregnation, thermal stability.

Thermal stability effect of H4[PVMo11O40]/SiO2 Leni Sinaga; Aldes Lesbani
Science and Technology Indonesia Vol. 2 No. 1 (2017): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Synthesis and characterization of supported polyoxometalate H4[PVMo11O40].nH2O with SiO2 through sol-gel method have been done. The compound H4[PVMo11O40]/SiO2 was characterized through FT-IR spectrophotometer, XRD, and SEM-EDX. The results showed that FT-IR spectrum of H4[PVMo11O40]/SiO2 has the primary vibration on wavenumber at 1064.7 cm-1 (P-O); 964.4 cm-1 (Mo=O); 864.1 cm-1 (Mo-Oe-Mo); 779.2 cm-1 (Mo-Oc-Mo); 462.9 cm-1 (Si-O); and 1087.9 cm-1 (Si-O-Si). The XRD diffraction pattern showed that H4[PVMo11O40].nH2O has the highest crystallinity. However, after it’s supported with SiO2, the properties of crystallinity has decreased due to the excess water during the support process. The result of SEM-EDX showed that H4[PVMo11O40]/SiO2 material has homogeneous distribution with particle size distribution of 1330 nm (1,33 μm). The acidity test by qualitative and quantitative methods show that H4[PVMo11O40]/SiO2 more acidic than H4[PVMo11O40].H2O. The effect temperature on the crystallinity showed that increasing calcination temperature made the crystallinity properties of H4[PVMo11O40]/SiO2 increased. Keywords : polyoxometalate, H4[PVMo11O40].nH2O, SiO2.

Adsorption of procion red using layer double hydroxide Mg/Al Muhammad Imron; Muhammad Said; Aldes Lesbani
Science and Technology Indonesia Vol. 2 No. 3 (2017): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Layer double hydroxide Mg/Al was synthesized by inorganic synthetic method. Material was characterized using FTIR and XRD analyses and used as adsorbent of procion red dye in aqueous medium. Factors that affect the adsorption process are adsorption time as the kinetic parameter; and the temperature and concentration of procion red as the thermodynamic parameter. FTIR spectra of layer double hydroxides showed unique vibration at wavenumber 1300 cm-1 and 1600 cm-1. Characterization using XRD shows diffraction angles at 29o, 27o, and 28o, which are typical of Mg/Al double layer hydroxides. Adsorption of procion red using layer double hydroxide Mg/Al resulted adsorption rate 7.1 minutes-1, maximum adsorption capacity 111.1 mg/g at 60 oC with increasing energy by increasing adsorption temperature. Keywords: Layered double hydroxides, adsorption, procion red.

Keggin type polyoxometalate H4[αSiW12O40].nH2O as intercalant for hydrotalcite Neza Rahayu Palapa; Muhammad Said
Science and Technology Indonesia Vol. 1 No. 1 (2016): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

The synthesis of hydrotalcite and polyoxometalate H4[αSiW12O40].nH2O with the ratio (2:1), (1:1), (1:2) and (1:3) has been done. The product of intercalation was characterized using FT-IR spectrophotometer, XRD, and TG-DTA. Polyoxometalate H4[αSiW12O40].nH2O intercalated layered double hydroxide was optimised to use as adsorbent Congo red dye. Characterization using FT-IR was not showing the optimal insertion process. The result using XRD characterization was showed successful of polyoxometalate H4[αSiW12O40].nH2O inserted layered double hydroxide with a ratio (1:1) which the basal spacing was expanded from 7,8 Ȧ to 9,81 Ȧ. Furthermore, the thermal analysis was performed using TG-DTA. The result show that the decomposition of polyoxometalate H4[αSiW12O40].nH2O intercalated hydrotalcite with ratio (1:1) was occured at 80oC to 400oC with a loss of OH in the layer at 150oC to 220oC, and then the decomposition of the compound polyoxometalate H4[αSiW12O40].nH2O at 350oC to 420oC. Keywords: Hydrotalcite, Layered Double Hydroxide, Polyoxometalate, Intercalation

Page 2 of 31 | Total Record : 301

1 2 3 4 5

Filter by Year

2016 2023

Filter By Issues

All Issue Vol. 8 No. 4 (2023): October Vol. 8 No. 3 (2023): July Vol. 8 No. 2 (2023): April Vol. 8 No. 1 (2023): January Vol. 7 No. 4 (2022): October Vol. 7 No. 3 (2022): July Vol. 7 No. 2 (2022): April Vol. 7 No. 1 (2022): January Vol. 6 No. 2 (2021): April 2021 Vol. 6 No. 4 (2021): October Vol. 6 No. 3 (2021): July Vol. 6 No. 1 (2021): January Vol. 5 No. 4 (2020): October Vol. 5 No. 3 (2020): July Vol. 5 No. 2 (2020): April Vol. 5 No. 1 (2020): January Vol. 4 No. 4 (2019): October Vol 4 No 3 (2019): July Vol 4 No 2 (2019): April Vol. 4 No. 2 (2019): April Vol. 4 No. 1 (2019): January Vol. 3 No. 4 (2018): October Vol. 3 No. 3 (2018): July Vol. 3 No. 2 (2018): April Vol. 3 No. 1 (2018): January Vol. 2 No. 4 (2017): October Vol. 2 No. 3 (2017): July Vol. 2 No. 2 (2017): April Vol. 2 No. 1 (2017): January Vol. 1 No. 1 (2016): October More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kab. ogan ilir,

Sumatera selatan

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name -

Contact Email -

Phone -

Journal Mail Official -

Editorial Address -

Location Kab. ogan ilir, Sumatera selatan INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kab. ogan ilir,

Sumatera selatan

INDONESIA