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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Kimia Universitas Brawijaya Physics Student Journal Natural B The Journal of Pure and Applied Chemistry Research JURNAL INTEGRASI PROSES Jurnal Kimia dan Kemasan Journal of Geoscience, Engineering, Environment, and Technology Chimica et Natura Acta Molekul: Jurnal Ilmiah Kimia JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) Fullerene Journal of Chemistry Acta Chimica Asiana Jurnal Kimia dan Kemasan ARRUS Journal of Engineering and Technology Makara Journal of Science Indonesian Journal of Fundamental Sciences Indonesian Mining Journal
Rachmat Triandi Tjahjanto
Chemistry Department, Faculty Of Mathematics And Natural Sciences, University Of Brawijaya, Jl. Veteran 65145 Malang, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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Mini Electrode Based on Chitosan-Activated Carbon Membrane for Detection of Paracetamol in Herbal Medicine Ani Mulyasuryani; Rachmat Triandi Tjahjanto; Zainul Abidin
The Journal of Pure and Applied Chemistry Research Vol 11, No 3 (2022): Edition September-December 2022
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2022.011.03.677

Abstract

A tube type mini electrode has been made to detect paracetamol levels in herbal medicine, the electrode is made of a glass tube with a diameter of 0.7 cm, a length of 3 cm. As the membrane is a mixture of chitosan, activated carbon from rice husk, and cetyl trimethyl ammonium (CTA)-paracetamol. The internal solution is a standard solution of 0.01 M paracetamol in a solution of phosphoric acid pH 2. The average sensitivity of the paracetamol sensor is (22.60 ± 0.01) mV/decade in a linear concentration range of 10-6 – 5x10-3 M, with an average recovery of (90.6 ± 0.5) %. Paracetamol sensor electrodes can be applied to samples of herbal medicine on the market, with an average error of (9.4 ± 0.1) %.
The Effect of Binder Concentration on the Ability of Gelcasting Porous Ceramics as TiO2 Support Catalysts Suriati Eka Putri; Diana Eka Pratiwi; Rachmat Triandi Tjahjanto; Abd. Rahman
Indonesian Journal of Fundamental Sciences Vol 8, No 1 (2022)
Publisher : Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (541.551 KB) | DOI: 10.26858/ijfs.v8i1.33168

Abstract

Abstract. This study aims to determine the effect of binder concentration on the ability of porous ceramics as TiO2 support catalyst. The porous ceramic synthesis used was the gelcasting method using natural clay as matrix, cassava starch as binder and CMC as dispersant. The concentration of cassava starch binder used were 2%, 4%, 6%, 8%, 10%. The methods used in catalyst supporting are adsorption method and sol gel coating method. Analysis of TiO2 catalyst content in porous ceramics using XRF instrument. The results obtained showed that the concentration of cassava starch affects the ability of porous ceramics as TiO2 catalyst support. The largest percentage of TiO2 catalyst with adsorption method was achieved at a binder concentration of 8% with a catalyst percentage of 38.9% while with sol gel coating method was achieved at a binder concentration of 4% with a catalyst percentage of 20.11%. Keywords: Binder, Cassava Starch, Porous Ceramic, Gelcasting, Support Catalysts
Synthesis and Activation Study of Iron (Fe) Based Fischer Tropsch (FT) Catalyst Using Sol-gel Method Muchammad Zainul Anwar; Rachmat Triandi Tjahjanto; Uswatun Hasanah
The Journal of Pure and Applied Chemistry Research Vol 8, No 3 (2019): Edition September-December 2019
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2019.008.03.480

Abstract

As oil consumption increases from year to year, efforts need to be made to increase energy reserves by developing new renewable energy. One way to develop energy sources is by the synthesis Fischer Tropsch (FT). FT is a synthetic gas conversion reaction (mixture of CO and H2) into a long chain hydrocarbon mixture. The FT reaction requires a catalyst called the FT catalyst. So far, many studies that examine the effectiveness of catalysts in converting synthesis gas into long chain hydrocarbons, but rarely information about the composition of the phases that exist on the surface of the catalyst. To study about it, we synthesized FT catalysts at various variations of calcination temperature. Fe(NO3)3 as a precursor and Cu(NO3)2 as promoter (20:1) used in this study. The calcination temperature used are 300, 500, and 700°C. Characterization and analysis of catalysts were formed with XRD and SEM-EDX. Calcined catalysts were activated using CO2 and H2 gas and then re-characterized with XRD and SEM-EDX. Calcination results the formation of an iron oxide phase, while activation results the formation of iron carbide and zero Fe phases.
Effect of NaOH Concentration Toward the Characteristics of Activated Natural Zeolite from Blitar – East Java Andi Nafis An Naafi; Rachmat Triandi Tjahjanto; Yuniar Ponco Prananto
Jurnal Kimia Sains dan Aplikasi Vol 26, No 2 (2023): Volume 26 Issue 2 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.2.50-56

Abstract

This study discusses the activation of natural zeolite from Blitar City – East Java using NaOH solution (0.5 M and 1.0 M). Characteristics of unactivated and activated zeolites were also investigated, as well as the effect of the activator (NaOH solution) on functional groups, element composition, pore size, specific surface area, and total pore volume. FTIR spectroscopy, XRF, and gas physisorption were conducted to support the study. Experimental data showed that: (1) the major functional groups were observed at 1250-780 cm-1 in the infrared spectra, in which the unactivated and the activated zeolite were not significantly different; (2) the elemental composition of zeolite (Si and Al) tended to decrease after the activation process; (3) the pore size of the activated zeolite increased while the surface area and total pore volume decreased. Based on this study, activated zeolite (AZB-1.0) showed the optimum result: the pore size increased by 4.12847 nm, and the total pore volume did not decrease significantly by 0.04987 cc/g.
One-Pot Transformation of (R)-(+)-Citronellal over a Bifunctional Ni/ZnBr2/β-Zeolite Catalyst Nisyak, Khoirun; Iftitah, Elvina Dhiaul; Tjahjanto, Rachmat Triandi
Makara Journal of Science Vol. 17, No. 3
Publisher : UI Scholars Hub

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Abstract

OPTIMALISASI PELINDIAN BIJIH MANGAN ASAL TIMOR TENGAH UTARA MENGGUNAKAN H2O2 SEBAGAI PEREDUKSI Faustina De Yesu Prisila Abi; Rachmat Triandi Tjahjanto; Yuniar Ponco Prananto
Indonesian Mining Journal Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol26.No1.2023.1301

Abstract

Optimization of manganese ore leaching process from North Central Timor, Indonesia has been investigated. The final product of the leaching process was MnSO4. Variables that were optimized during the process were volume of H2O2, reaction temperature, and reaction time. The final products were characterized by FTIR, powder-XRD, XRF, and AAS. Experimental data shows that the optimum conditions for the leaching process were 50 mL H2SO4 4 M, 25 mL H2O2 2 M, in which the reaction was done at room temperature for two hours. This optimum condition resulting in 38.2% of Mn extraction with 96.88% purity. Based on powder-XRD, the products were a mixture of crystalline MnSO4.4H2O, MnSO4.5H2O and [NH4]8[Mn8(SO4)12].
Pendampingan Sertifikasi Halal Jalur Sehati UKM Kecamatan Turen Kabupaten Malang Sebagai Bagian dari Mahasiswa Membangun Desa (MMD) Anna Safitri; Sri Wardhani; Layta Dinira; Eko Waluyo; Rachmat Triandi Tjahjanto
JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) VOL. 8 NOMOR 2 JULI 2024 JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat)
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jppm.v8i2.21363

Abstract

Mahasiswa Membangun Desa (MMD) merupakan program Universitas Brawijaya dengan target 1000 desa di Jawa Timur. Program ini merupakan salah program yang didesain untuk meningkatkan keterlibatan perguruan tinggi melalui mahasiswa berperan aktif dalam kegiatan penguatan kapasitas sosial, ekonomi, dan lingkungan masyarakat. Pada kegiatan MMD di kecamatan Turen, kabupaten Malang, salah satu tema kegiatan adalah pendampingan sertifikasi halal dengan jalur sehati bagi pelaku UKM (Usaha Kecil dan Menengah) di kecamatan Turen. Tujuan dari kegiatan ini adalah untuk membantu para pelaku usaha yang tergabung dalam paguyuban UKM Maju Bersama dalam pengajuan sertifikat halal. Kegiatan dilaksanakan seiring dengan pelaksanaan kegiatan MMD di kecamatan Turen selama bulan Juli 2023, dengan tim pengabdian masyarakat merupakan DPL (dosen pembimbing lapang) MMD pada kecamatan Turen pada 10 desa. Metode kegiatan menggunakan model ABCD (asset-based community development), yaitu pemberdayaan masyarakat yang menekankan pada pemanfaatan aset dan potensi masyrakat. Hasil pengabdian masyarakat ini adalah sebanyak 20 pelaku usaha telah melakukan pengajuan sertifikat halal untuk produknya, dan 12 telah mendapatkan sertifikat halal. Selain itu mahasiswa mendapatkan manfaat yaitu mendapatkan pengalaman sosial, berinteraksi dengan masyarakat secara langsung dan melakukan pendampingan pada masyarakat dalam pengajuan sertifikasi halal.
Green Hydrothermal Synthesis of Ni(II)-MOF with Terephthalate-Pyrazine Mixed Ligands at Mild Condition Finisia, Yenni; Tjahjanto, Rachmat Triandi; Prananto, Yuniar Ponco
The Journal of Pure and Applied Chemistry Research Vol. 13 No. 2 (2024): Edition May-August 2024
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2024.013.02.6533

Abstract

Ni(II) with mixed ligand of terephthalate-pyrazine (NiTP) metal complex can form metal-organic framework (MOF) material that offer many potential applications, such as adsorbent and/or photocatalyst for dye-based wastewater treatment. Production of the NiTP by hydrothermal method in a larger scale may economically unfavorable due to it requires high temperature and long reaction time. Green synthesis of NiTP by hydrothermal method using lower temperature and shorter reaction time was investigated in this study. The synthesis was done in Ni(II):T:P mol ratio of 1:1:4 at 150 ᵒC for 10 hours. The NiTP complex was characterized by infrared spectroscopy and powder-XRD. Crystallinity degree, thermal stability, band gap energy, and pore volume of the NiTP complex were compared to that of Ni(II)-terephthalate (NiT) complex, which was also made using the same condition, to study the effect of pyrazine addition on the properties of the NiTP. This study finds that the green microcrystalline NiTP complex was successfully obtained from mild reaction condition in good yield and identical to known MOF compound of [Ni(μ3-ter)(μ2-pyr)]n.(ter = terephthalate; pyr = pyrazine). Although the synthesized NiTP complex has lower crystallinity degree compared to the NiT complex, but it has better thermal stability, lower band gap energy, and bigger pore volume; therefore, it is possible to be further developed as adsorbent and/or photocatalyst for wastewater treatment.
Effect of solvent in the solvothermal synthesis of nickel(II)-terephthalate complex Finisia, Yenni; Tjahjanto, Rachmat Triandi; Prananto, Yuniar Ponco
Acta Chimica Asiana Vol. 7 No. 2 (2024)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v7i2.198

Abstract

This research aims to replace the use of dimethylformamide (DMF) with a greener solvent in the solvothermal synthesis of nickel(II)-terephthalate complex. Effect of solvent on the crystallinity degree, thermal stability, and band gap energy of the synthesized complex are also studied. The synthesis was carried out using solvothermal method at 150 0C for 10 hours with a Ni(II) : terephthalate acid mol ratio of 1:1 in several H2O:DMF solvent compositions (1:0; 1:1; and 0:1). The precipitated products underwent characterization using ATR-IR, P-XRD, SEM, TGA, Surface Area Analyzer, and UV-DRS. Findings revealed the successful formation of the Ni(II)-terephthalate complex using three different solvent compositions (H2O/DMF = 1:0, 1:1, and 0:1). This suggests that the complex can be synthesized using more environmentally friendly solvents, potentially reducing or substituting the use of DMF solvent. However, the solvent affects the characteristics of the synthesized complex, in which green block microcrystalline solid was obtained when using water as the solvent, meanwhile green aggregates with lower crystallinity degree was precipitated out when using DMF or H2O-DMF. The Ni(II)-terephthalate complexes obtained from the H2O and H2O-DMF solvents are different to that of from the DMF solvent, but they both has identical powder diffraction pattern with previously reported compound of [Ni3(OH)2(C8H4O4)2(H2O)4].2H2O. Furthermore, the use of water as the solvent increase the crystallinity degree and thermal stability of the complex but the band gap energy of the synthesized Ni(II)-terephthalate complex compared to that of obtained from the DMF solvents.
Study of Suspension Concentration Effect to The Electrical Resistance of Zinc Sulphophthalocyanine (ZnPcSn) Thin Film as Prototype of Ozone Detector Ratnawati, Dhesy Galuh; MASRUROH, Masruroh; Tjahjanto, Rachmat Triandi
The Journal of Pure and Applied Chemistry Research Vol. 3 No. 2 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (573.417 KB) | DOI: 10.21776/ub.jpacr.%y.03.02.166

Abstract

We have studied the fabrication of zinc sulphophthalocyanine (ZnPcSn) thin film as prototype of ozone detector. The aim of this research is to find the relation between the electrical resistance of ZnPcSn thin film and the ZnPcSn suspension concentration. The thin film of ZnPcSn was deposited on Printed Circuit Board (PCB) substrate by using spin coating method, then, annealed at temperature of 100 oC. The resistance of ZnPcSn thin film was measured as it was exposed with ozone, synthesized from fresh air, for 60 min continuously. The electrical measurement was conducted twice for each point of data. The result of this research shows that the electrical resistance of ZnPcSn thin film decreases during the ozone exposure, and, it can be concluded that as the concentration of ZnPcSn suspension concentration increase, more amount of ozone can be adsorbed by thin film.
Co-Authors A.A. Ketut Agung Cahyawan W Abd. Rahman Abdul Rahman Afida, Laely Nur Agus Farid Fadli Agustina Mogi Ahmad Fudhail  Majid Ahmad Naufal Hasti Eka Putra Akhmad Sabarudin Alfina, Bulan Tahta Alfita Safitri Andi Nafis An Naafi Angga Fami Rayendra Anggriana Novitasari, Anggriana Ani Mulyasuryani Anjani, Ryzki Martha Anna Safitri Ardhi, Tunjung Nourman Sasono Asrianda Asrianda Barlah Rumhayati Barlah Rumhayati Christiana Adi Damayanti Danar Purwonughroho Danar Purwonugroho Danar Purwonugroho Darjito Darjito Darjito, Darjito Dhesy Galuh R. Dhesy Galuh Ratnawati Diah Mardiana Diana Eka Pratiwi Diana Eka Pratiwi Didik Pramana Dita Anggarini Eko Waluyo Elvina Dhiaul Iftitah Elvina Dhiaul Iftitah Elvina Dhiaul Iftitah Erica Marista Rosida Ernesta Wae Faisal Maulana Malik Ibrahim Faustina De Yesu Prisila Abi Finisia, Yenni Herinda Sensustania Hidayat, Rusdhi Nur I Wayan Adi Suarya I Wayan Wira Yuda Iftitah, Elvina Dhiaul Ika Oktavia Wulandari Imam Fathoni Isnaini, Yulia Nur Khoirun Nisyak Khoirun Nisyak Kiky Frederika Rumapar Lapailaka, Titus Layta Dinira Lidya Rosnita Masruroh Masruroh Masruroh Masruroh Masruroh Masruroh Masruroh MASRUROH Masruroh Masruroh Masruroh Masruroh Meirawati, Dian Mohammad Abdul Ghofur Mohammad Farid Rahman Mohammad Misbah Khunur Muchammad Zainul Anwar Muhammad Misbah Khunur Muhlis Muhlis Naat, Johnson N. Nafikah, Fifi Nik Matul Ula Nisyak, Khoirun Oktaria Ardika Pratama, Oky Yoga Purwonugroho, Danar Rendrahadi, Randhy Dwi Riska Yudhistia Asworo Rizky Arief Shobirin Roosdiana, Anna Rosmawati, Angelina Rosyida, Firdania Firdaus S.J. Iswarin Siti Mariyah Ulfa Sri Wardhani Suriati Eka Putri Ulfa Andayani Ulfa Anggraini Uswatun Hasanah Utomo, Edi Priyo Vita Valiana Widyasari, Elok Nuri Yuniar Ponco Prananto Zaemi, Haris ZAINUL ABIDIN Zulfikar, Mochammad Abrianto