Garuda - Garba Rujukan Digital

p-Index From 2021 - 2026

3.48

P-Index

This Author published in this journals

All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Dasar POSITRON Jurnal Kimia Khatulistiwa Jurnal Sains dan Teknologi Jurnal Riset Kimia Jurnal Kelautan Tropis Indonesian Journal of Chemistry Indonesian Journal of Pure and Applied Chemistry CHEESA: Chemical Engineering Research Articles Indonesian Journal of Chemical Analysis (IJCA) GERVASI: Jurnal Pengabdian kepada Masyarakat JKPK (Jurnal Kimia dan Pendidikan Kimia) Jurnal Riset Sains dan Kimia Terapan Equilibrium Journal of Chemical Engineering Jurnal Teknologi Lingkungan Lahan Basah Jurnal Akademika Kimia Jurnal Akademika Kimia

Adhitiyawarman, Adhitiyawarman

Jurusan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Tanjungpura

Author-ID : 1767799

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Energy Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Other

Published : 33 Documents Claim Missing Document

Claim Missing Document

Articles

1 2 3 4

Sintesis Titanium Oksida/Reduced Graphene Oxide (TiO2/rGO) untuk Fotokatalisis Bahan Pewarna Metilen Biru Pratama, Andre; Destiarti, Lia; Adhitiyawarman, Adhitiyawarman
POSITRON Vol 11, No 1 (2021): Vol. 11 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Metilen biru (MB) merupakan bahan pewarna tekstil yang banyak digunakan di industri. Fotokatalisis dapat digunakan untuk mendegradasi struktur senyawa MB yang kompleks tersebut. Faktor penting dalam fotokatalisis adalah peran dari katalis, dalam hal ini. reduced graphene oxide (rGO) telah berhasil disintesis dengan memodifikasi metode Hummer. Reduced graphene oxide dikompositkan dengan titanium oksida (TiO2) karena orbital d-Ï€ pada TiO2â€“rGO akan saling tumpang tindih sehingga eksitasi elektron dapat terjadi secara berulang untuk menekan rekombinasi saat fotokatalisis TiO2 dan meningkatkan efektifitas fotokatalisis dalam mendegradasi metilen biru. Reduced graphene oxide dibuat dengan cara mereduksi gugus oksida pada graphene oxide (GO) menggunakan hydrazine hydrate. Difraktogram XRD menunjukan karakteristik puncak GO pada 2Î¸ = 10,3Â° dan 26,4Â° serta rGO pada 2Î¸ = 26,4Â°. Fotokatalisis dilakukan pada MB dengan katalis TiO2, dan TiO2â€“rGO, dengan rentang waktu 0, 30, 60, 90, 120 menit. Hasil fotokatalisis TiO2â€“rGO terbukti lebih baik dari TiO2Â dalam mendegrasi MB, dengan efisiensi degradasi TiO2â€“rGO adalah 85,38%, danÂ TiO2 sebesar 72,49%.

SYNTHESIS OF Co(II)-TiO2/KAOLINITE AS A ANTIBACTERIAL Escherichia coli PHOTOCSINTESIS Co(II)-TiO2/KAOLIN SEBAGAI FOTOKATALIS ANTIBAKTERI Escherichia coli DENGAN BANTUAN SINAR TAMPAK (SYNTHESIS OF Co(II)-TiO2/KAOLINITE AS A ANTIBACTERIAL Escherichia coli PHOTOCATALYST UNDER VISIBLE LIGHT) Elyta Clarissa; Adhitiyawarman Adhitiyawarman; Anthoni B Aritonang
Indonesian Journal of Pure and Applied Chemistry Vol 4, No 3 (2021)
Publisher : Tanjungpura University

Photocatalyst Co(II)-TiO2/kaolinite as a antibacterial E.coli has been successfully synthesized using sol-gel method. The purpose of this study was to determine the characteristics and Co(II)-TiO2/kaolinite photocatalyst activity as antibacterial E.coli under visible light. Synthesis of Co(II)-TiO2/kaolinite using TTIP as a precursor for Ti and CoCl2.6H2O as a precursor to Co(II) dopant. The doping process is carried out using the sol-gel method with the stages of hydrolysis, condensation, aging and calcination at a temperature of 450 ºC. The impregnation process on kaolinite was carried out using the wet impregnation method. The antibacterial activity test of E.coli under visible light was carried out using the turbidimetric method using a UV-Vis spectrophotometer at a wavelength of 600 nm. The activity test results showed that the Co(II)-TiO2 photocatalyst with a concentration of Co(II) dopant 3 %w/v had the best inhibition power reaching 35,47 %. The synthesized Co(II)-TiO2/kaolinite photocatalyst was analyzed using FTIR, XRD and UV-Vis DRS instruments. The results of FTIR analysis show that there is a shift in Ti-O absorption towards a smaller wave number which indicates that the Co(II) dopant has successfully entered the TiO2 structure. The XRD diffractogram showed that the Co(II)-TiO2/kaolinite photocatalyst had an anatse phase at 2q = 25,256º with a crystal size of 17-25 nm. UV-Vis DRS spectroscopic analysis showed a decrease in the band gap energy value from 3.35 eV to 1.69 eV.

PENENTUAN KADAR MANGAN (Mn) PADA AIR GAMBUT SECARA SPEKTROFOTOMETRI UV-Vis DENGAN PERBANDINGAN METODE KURVA KALIBRASI DAN ADISI STANDAR (DETERMINATION OF MANGANESE IN PEAT WATER USING UV-Vis SPECTROPHOTOMETER: COMPARATION OF CALIBRATION OF CURVE AND STANDARD ADDITION METHOD) Emilia Emilia; Lia Destiarti; Adhitiyawarman Adhitiyawarman
Indonesian Journal of Pure and Applied Chemistry Vol 4, No 1 (2021)
Publisher : Tanjungpura University

Peat water has different characteristics from one location to another. The characteristics referred to include levels of organic matter, pH, conductivity, and turbidity. Based on these differences, it is necessary to research to determine the analytic parameters and the effect of matrix differences on manganese levels using a separate calibration method and standard addition using a Uv-vis spectrophotometer. The determination of manganese was carried out by the persulfate method, that is the oxidation of Mn in water by persulfate in an acidic and hot atmosphere to form MnO4 which is purple-red. The obtained results from the determination of the analytical parameters of the separate calibration method are precision of 7.75% to 63.96%, an accuracy of 0.80% to 5.24%, the linearity of r = 0.997, a detection limit of 0.170 ppm, and a limit of quantification of 0.567 ppm. Meanwhile, the addition method produces a precision of 2.19% to 20.35%, accuracy and linearity at points I, II, III are 10.65% to 25.47% respectively; 20.9% to 26.8%; 2.76% to 27.24% and 0.995; 0.999; 0.995. Linearity in addition as well as in calibration curves at all points have met the minimum value of SNI 6989.5: 2009 (R ≥ 0.995). In addition, based on the results of the comparison of the levels of the separate calibration and standard additions, the values are different, but the results of the t-test result in t-count <t-table. This means that there is no significant difference between separate calibration methods and standard addition.

Photocatalytic Degradation of Methylene Blue using Fe2O3-TiO2/Kaolinite under Visible Light Illumination Anthoni Batahan Aritonang; Hanopa Selpiana; Muhammad Agus Wibowo; Warsidah warsidah; Adhitiawarman Adhitiawarman
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 7, No 3 (2022): 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.v7i3.66567

Combining TiO2 and a semiconductor with a smaller band gap, such as Fe2O3, to form a heterojunction composite can increase its photocatalytic activity. In this work, the Fe2O3-TiO2/kaolinite composites were successfully synthesized by ultrasonic-assisted coprecipitation using titanium-tetraisopropoxide (TTIP) dan Fe (NO3)3.9H2O as precursors. Using kaolinite as a matrix also increases the photocatalyst’s surface area. The obtained Fe2O3-TiO2/kaolinite composites were characterized. The crystal phase was characterized using X-Ray Diffraction and resulted in anatase with a crystallite size average of 9,7 nm. Fourier Transform Infrared Spectrophotometer (FTIR) shows the peak at a wavenumber 574-1210 cm−1 ascribed TiO2 and Fe2O3 incorporated into kaolinite. The Optical properties show the absorption edge of Fe2O3-TiO2/kaolinite is redshift toward the visible light region. The result showed that the photocatalytic activity of Fe2O3-TiO2/kaolinite composites with heterostructure was more active than the corresponding Fe2O3 or pure TiO2 in the degradation of methylene blue under visible light illumination, which can degrade 83% for 180 minutes. Fe2O3 and kaolinite cause its synergistic effect as supporting materials. Furthermore, it indicates that the recombination of photo hole and photoelectron charge pair can be minimized. The Fe2O3-TiO2/kaolinite composite is a promising photocatalyst to degrade organic pollutants for wastewater treatment.

Sintesis TiO2-rGO Dengan Pereduksi Alumunium untuk Fotokatalisis Degradasi Metilen Biru dibawah Irradiasi Sinar Tampak Anthoni Batahan Aritonang; Putry Parwaty; Muhammad Agus Wibowo; Puji Ardiningsih; Adhitiyawarman Adhitiyawarman
Equilibrium Journal of Chemical Engineering Vol 6, No 2 (2022): Volume 6, No 2 December 2022
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v6i2.65518

ABSTRAK. Sintesis TiO2-rGO telah dilakukan dengan prekursor TiO2 dan rGO yang disintesis dari batang grafit menggunakan metode Hidrotermal. Fotokatalis TiO2-rGO hasil sintesis dikarakterisasi menggunakan X-ray diffractometer (XRD), Fourier-transform infrared spectroscopy (FT-IR) dan Diffuse Reflectance UV-VIS (DRUV). Sintesis rGO dengan metode elektrokimia menggunakan agen pereduksi Alumunium. Dilakukan uji aktivitas menggunakan metilen biru dengan bantuan sinar tampak. Berdasarkan data hasil perhitungan diperoleh nilai celah pita TiO2 sebesar 3,33 eV, TiO2-rGO sebesar 3,23 eV yang setara dengan panjang gelombang 378 nm dan 410 nm. Aktivitas fotokatalitik TiO2 dibawah irradiasi sinar tampak mengalami peningkatan setelah dikompositkan dengan rGO membentuk komposit TiO2-rGO mampu mendegradasi MB hingga 67,05%.Kata Kunci: Fotokatalis, rGO, TiO2-rGO, elektrokimia, metilen biru ABSTRACT. TiO2-rGO synthesis was carried out with TiO2 precursor and rGO that was synthesized from a graphite rod using a hydrothermal method. Photocatalysts TiO2-rGO were characterized by X-ray diffractometer (XRD), Fourier- transform infrared spectroscopy (FT-IR), and Diffuse Reflectance UV-VIS (DRUV). Synthesis of rGO by the electrochemical method using reducing agent Aluminum. The activity test was carried out using methylene blue with the help of visible light. Based on the calculated data, the band gap value of TiO2 is 3.30 eV, and TiO2-rGO is 3.00 eV, equivalent to a wavelength of 378 nm and 410 nm. These data indicate that the rGO material reduces the band gap but the low band gap decrease. The photocatalytic activity of TiO2 under visible light irradiation increased after being composited with rGO to form a TiO2-rGO composite capable of degrading MB up to 67.05%Keywords: Photocatalyst, rGO, TiO2-rGO, electrochemistry, methylene Blue

SINTESIS ZEOLIT A BERBAHAN DASAR ABU TERBANG (FLY ASH) LIMBAH PT. INDONESIA CHEMICAL ALUMINA (ICA) MENGGUNAKAN METODE ALKALI HIDROTERMAL (SYNTHESIS OF ZEOLITE A BASE ON FLY ASH WASTE PT. INDONESIA CHEMICAL ALUMINA (ICA) USING HYDROTHERMAL ALKALINE METHOD) Rizky Fitri Febrianti; Titin Anita Zahara; Adhitiyawarman Adhitiyawarman
Indonesian Journal of Pure and Applied Chemistry Vol 5, No 1 (2022)
Publisher : Tanjungpura University

Fly ash is one of the combustion residues from coal-fired power plants which is produced in large quantities. The main elemental composition of fly ash is silica and alumina with content of 48.055% and 14.653%, respectively. This study aims to determine the characteristics of zeolite A synthesized from fly ash with various ratios of SiO2 and Al2O3. Zeolite A was synthesized using the alkaline hydrothermal method by varying the Si/Al molar ratio of 0.8 1 and 1.2. The initial process begins with the leaching process of fly ash waste and is followed by alkaline smelting. Furthermore, zeolite A was synthesized by adding sodium silicate and sodium aluminate to form a white gel. These steps were followed by a hydrothermal process using a hydrothermal autoclave at a temperature of 100֯C for 5 hours. Qualitative results on XRD showed that zeolite A synthesized at a ratio of Si/Al 1,2 had a 2ϴ position closer to standard zeolite A, which was seen based on the highest peaks at 2ϴ=12,420, 16,070, 20,360, 21,590, 23,960, 26,070, 27,080, 29,910, 32,500, 41,480, 44,090, 52,540, 54,230 and 66,660 and the structure formed is in cubic form with a crystallinity of 76.36%. Analysis using XRF showed that the Si/Al 1.2 ratio was the best for the formation of zeolite A. In this variation the silica and alumina content increased by 54.412% and 35.054%, respectively

Synthesis of Reduced Graphene Oxide-Bentonite Composite and Its Application as a Lead(II) Ion Adsorbent Bartholomeus Lavelim; Lia Destiarti; Adhitiyawarman Adhitiyawarman; Risya Sasri
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.67993

The use of reduced graphene oxide (rGO) as an adsorbent has challenges to overcome. Although rGO has a large surface area, its solubility in water is very low. In this study, bentonite is added to reduce the use of rGO mass and increase the dispersibility of the adsorbent. The rGO-bentonite (rGOB) was characterized by XRD, FTIR, SEM-EDX, and XRF. The adsorption activity was tested in a Pb ion solution, derived from AAS. The XRD pattern of GO, rGO, and rGOB of 2q were observed at 10.90°, 24.88°, and 26.66°, respectively. The FTIR spectrum showed that GO has C=C, C-O, C=O, and O-H, while in rGO, C=O disappears, and there was a significant decrease in the O-H and C-O peaks. The rGOB has identical spectra with rGO and yet has an additional peak from bentonite O-Si-O. The GO and rGO form agglomerate while rGOB looks more dispersed. The C/O ratio increases from GO to rGO because of the reduction process. The bentonite is Ca-bentonite with main components Al2O3, SiO2, and CaO. The results showed that the rGOB composite could reduce the use of rGO by up to 80% and have an adsorption performance similar to rGO with an adsorption capacity of 217 mg/g.

Synthesis and Characterisation of B-CDs/TiO2 Composite Anthoni B. Aritonang; Ajuk Sapar; Uswatun Hasanah; Adhitiyawarman Adhitiyawarman; Puji Ardiningsih
Jurnal Akademika Kimia Vol. 11 No. 4 (2022)
Publisher : Universitas Tadulako

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

Synthesis of composite boron-doped carbon nanodots (B-CDs)/TiO2 using the sol-gel method performed with titanium tetraisopropoxide (TTIP) precursor and B-CDs prepared by the microwave method using citric acid monohydrate, urea, and boric acid as precursors. The optimum concentration of boron dopant (B) on B-CDs/TiO2 is 0.5% boron (w/w) which is then used as a composite on TiO2 resulting in a brown solid and has blue luminescent under UV light. The result with UV-Vis/DRS for variation in B-CDs concentration of 0.5%, 1.25%, and 2.5% showed Eg values of 2.34 eV, 2.00 eV, and 2.29 eV. B-CDs cause the maximum emission peak (λEm) to redshift and affect the intensity of photoluminescence TiO2. The characterization of FT-IR does not indicate a new peak, there is no bonding in the B-CDs/TiO2 composite. The TiO2 diffractogram was observed to shift towards a larger 2θ which caused the crystallinity of TiO2 to decrease. Based on the photocatalytic activity test on the degradation of methylene blue solution, it showed fairly good activity. It is expected that the B-CDs/TiO2 composite has the potential to be applied as a photocatalyst to degrade organic pollutants under visible light illumination.

Synthesis of Ni doped-TiO2 Thin Film Photocatalysts on Glass Surfaces Margareta Caroline Harunrasjid; Anthoni Batahan Aritonang; M. Agus Wibowo; Puji Ardiningsih; Adhitiyawarman Adhitiyawarman
Indonesian Journal of Chemical Analysis (IJCA) Vol. 6 No. 1 (2023): Indonesian Journal of Chemical Analysis
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijca.vol6.iss1.art9

Thin film of TiO2 modified Ni2+ cationic (Ni doped-TiO2) thin films were synthesized from titanium tetraisopropoxide (TTIP) and Ni(NO3)2.6H2O using the combined sol-gel and dip coating method followed by calcination at 500oC for an hour. This study aims to determine the concentration of Ni2+ and the optimum number of layers for application as self-cleaning. Frontier transform infrared (FTIR) spectrophotometric analysis observed a shift in the vibration absorption peak of Ti-O towards a smaller wave number as an indication that the Ni2+ cationic have incorporated in the TiO2matrix in forming Ni-TiO2. Based on the of x-ray diffraction (XRD) it is known that Ni-TiO2 has anatase crystalline phase with a crystallite size of 149.20 nm. Diffuse reflectance ultraviolet-visible (DRSUV-Vis) spectrophotometry showed a decrease in the bandgap energy (3.2 eV to 2.22 eV). Surface morphological by scanning electron microscopy (SEM) method showed that the addition of polyethylene glycol (PEG) resulted in a more homogeneous distribution of particles than thin films without PEG. The self-cleaning activity of Ni-TiO2 was tested for surface hydrophilic properties by measuring the contact angle of water and oil droplets under visible light illumination.

Sintesis dan Uji Fotostabilitas Kompleks Zn(II)-Astaxanthin Winda Rahmalia; Dwi Imam Prayitno; Adhitiyawarman; Septiani
Jurnal Riset Kimia Vol. 14 No. 1 (2023): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v14i1.568

Astaxanthin is a pigment from the carotenoid group found in algae, shrimp, and crabs. Due to its chemical structure, astaxanthin has many health benefits but low stability against direct exposure to light and oxygen. In this study, the Zn-astaxanthin complex was synthesized using a reflux reactor at 37o and 60oC. Complex compounds were analyzed using a UV-Vis spectrophotometer and FTIR. The UV-Vis spectrophotometer analysis showed a bathochromic shift in acetone (475 to 477 nm). In comparison, in dimethyl sulfoxide, a hypsochromic shift (493 to 475 nm) was observed, and a new absorption peak was observed at 330 nm. FTIR analysis shows a decrease in the intensity of the C=O stretching vibration and -OH group vibration at 1712 and 1219 cm-1, respectively. This indicated an interaction between the metal ion Zn2+ and astaxanthin. Zn-astaxanthin has better stability than astaxanthin during irradiation, using a halogen lamp at a light intensity of 300 W/m2 for 6 hours. Based on the zero-order degradation kinetics model, the degradation rate constant of the Zn-astaxanthin complex was 0.0621, smaller than that of astaxanthin (0.0880).

Co-Authors Adhitya Adhitya Afghani Jayuska Ajuk Sapar Akbar, Aji Ali Anthoni B. Aritonang Anthoni B. Aritonang Antonius Antonius Antonius Aritonang, Anthoni Batahan Asmadi asmadi Bartholomeus Lavelim Berlian Sitorus Destiarti, Lia Elyta Clarissa Emilia Emilia Evi Gusmayanti Gusrizal Gusrizal Hanopa Selpiana Harlia Harlia Imelda Hotmarisi Silalahi Intan Syahbanu Jajat sudrajat Kuswariyah, Ratmi Lia Destiarti Lubis, Yosef Novem Batistuta M. Agus Wibowo Margareta Caroline Harunrasjid Muhamad Agus Wibowo Muhammad Agus Wibowo Muhammad Agus Wibowo Novayanti, Fadia Novianti, Icha Prayitno, Dwi Imam Puji Ardiningsih Puji Ardiningsih Puji Ardiningsih Puji Ardiningsih Puji Ardiningsih Putry Parwaty Risya Sasri Rizky Fitri Febrianti Rossie Wiedya Nusantara RR. Ella Evrita Hestiandari Saraswati, Endah Sari, Heni Puspita Septiani Septiriyani, Melia Sri Milawati Syahbanu, Intan Titin Anita Zahara Uswatun Hasanah Veren Fransiska Warsidah warsidah Winda Rahmalia Winda Rahmalia Winda Rahmalia Winda Rahmalia Zaharah, Titin Anita

Title

Found 33 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 33 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 33 Documents
Search