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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 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

Author-ID : 404074

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT 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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Ozone Determination: A Comparison of Quantitative Analysis Methods Rachmat Triandi Tjahjanto; Dhesy Galuh R.; Sri Wardhani
The Journal of Pure and Applied Chemistry Research Vol 1, No 1 (2012)
Publisher : Chemistry Department, The University of Brawijaya

A comparison of ozone quantitative analysis methods by using spectrophotometric and volumetric method has been studied. The aim of this research is to determine the better method by considering the effect of reagent concentration and volume on the measured ozone concentration. Ozone which was analyzed in this research was synthesized from air, then it is used to ozonize methyl orange and potassium iodide solutions at different concentration and volume. Ozonation was held for 20 minutes with 363 mL/minutes air flow rates. The concentrations of ozonized methyl orange and potassium iodide solutions was analyzed by spectrophotometric and volumetric method, respectively. The result of this research shows that concentration and volume of reagent having an effect on the measured ozone concentration. Based on the results of both methods, it can be concluded that volumetric method is better than spectrophotometric method.

Effect of Tin Electrode (Sn), Electrode Distance and Thin Layer Size of Zinc Phthalocyanine (ZnPc) to Resistance Changes With Ozone Exposure Agustina Mogi; Masruroh Masruroh; Rachmat Triandi Tjahjanto
The Journal of Pure and Applied Chemistry Research Vol 7, No 1 (2018): Edition January-April 2018
Publisher : Chemistry Department, The University of Brawijaya

This study was aimed to determine the effect of tin electrode distances and the thickness of a thin layer of ZnPc (Zinc phtyalocyanine) toward changes in resistance with ozone exposure. Tin deposition on the glass surface was conducted using spraying method. The reaction between ozone and ZnPc produces electrical properties that can be read through the resistance value of the multimeter. Based on this study, it was investigated that the smaller a distance between the electrode and the thicker deposition of ZnPc lead to the less resistance. This showed that a thin layer of the conductivity increases along with the longer exposure to ozone gas. The movement of electrons with the hole was free.

Study of Hydrolysis on Pb(ZrxTi1-x)O3 Synthesis Using Zirconium(IV) Nitrate as Precursor and Their Densification Process Akhmad Al-bari; Rachmat Triandi Tjahjanto; Masruroh Masruroh
The Journal of Pure and Applied Chemistry Research Vol 7, No 3 (2018): Edition September-December 2018
Publisher : Chemistry Department, The University of Brawijaya

Pb(ZrxTi1-x)O3 has extensive application in electronic components as a thin layer. The densification layer is controlled by some factor such as precursor composition and heating techniques. Therefore, it is necessary to get simply precursor synthesis from zirconium(IV) nitrate stabilized polyol-acetate. In other hand, hydrolysis factor and the heating rate are affected as well as factor control. The PZT synthesis (55:45) was varied in Rw ratio as comparing water mole and the total mole of metal. The result of Rw = 0, 6, 9, and 12 are coated on silicon substrates and annealed with heating rates variate 1, 5, 10, and 30 °C/min for 650°C. The characterization and analysis were performed with FTIR and a microscope. Furthermore, the thermal dynamic behavior and crystal orientation are observed. The results show PZT synthesis from zirconium(IV) nitrate precurseor and PEG-acetate was stable and that can reproduce. The effect of rising of heating rate causes the dissipating PZT agglomeration, while the addition of water causes the cracking of crystals to become more massive.

Study of Sodium Chloride Production Using Gradual Evaporation of Seawater from Nggolonio Sea, East Nusa Tenggara Ernesta Wae; Rachmat Triandi Tjahjanto; Diah Mardiana
The Journal of Pure and Applied Chemistry Research Vol 10, No 2 (2021): Edition May-August 2021
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2021.010.02.483

Sea water as a raw material resources for the kitchen salt production, besides containing NaCl, has also containing other dissolved salts such as hygroscopic calcium and magnesium salts. The high content of other salts cause industrial NaCl has a low quality. This aim research was to find out the effect of seawater evaporation on NaCl content changes. Seawater obtained from Nggolonto, Nagekeo, NTT, was used with an initial volume of 200 mL, then it was concentrated in varying of final volume, i.e. 20, 23, 25, 27 and 29 mL. The NaCl content was calculated based on total chloride ion content, corrected toward magnesium and calcium ions content and the presence of sulphate anion. In addition, the chloride and magnesium also calcium ions content was analyzed volumetrically, while the sulphate anion was determined spectrophotometrically. The research result showed that NaCl content increase significantly up to 27 mL of final volume and was constantly afterward. Furthermore, the highest of NaCl content obtained from final volume of 29 mL was 96.01%. Nevertheless, comparing to SNI 06-0303-1989, its content was still below the standard of 98.5%.

Adsorption of Lead and Copper Using Water Hyacinth Compost (Eichornia Crassipes) Kiky Frederika Rumapar; Barlah Rumhayati; Rachmat Triandi Tjahjanto
The Journal of Pure and Applied Chemistry Research Vol 3, No 1 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Adsorption ofheavy metals Pb and Custudies have been carried out usinga compost of plant water hyacinth (Eichornia crassipes). First steps of the compostingis fermenting fresh hyacinth plants that have been enumeratedwithmolasses and water. Once formed, the compost is used as an adsorbent for the adsorption of heavy metals Pb and Cu. After that process, the water hyacinth compost have been characterized to determine the humic acid content, as well as the functional group content of heavy metals Pb and Cu. Determination of general conditions on the adsorption of Pb and Cu performed with adsorbent mass variations, variations in pH and the concentration variation and studying adsorption isotherm. The results showed that the adsorption of Pb in optimum condition occurs in adsorbentmass of 1.2 g with pH 5. As for the adsorption of Cu on the optimum conditions occur in the adsorbent mass of 0.8 g at pH 6. Results also able to adsorb up to 95.13% Pb andup to 91.42% Cu. Pb and Cu adsorption using adsorbents of water hyacinth compost more models to follow Langmuir than Freundlich models.

Determination of Hydroquinone in a Square Wave Voltammetry based on Screen Printed Carbon Electrode Alfita Safitri; Ani Mulyasuryani; Rachmat Triandi Tjahjanto
The Journal of Pure and Applied Chemistry Research Vol 4, No 1 (2015)
Publisher : Chemistry Department, The University of Brawijaya

Hydroquinone is a phenolic compound are often used extensively in the cosmetics industry as whitening agent. This compound is very toxic and their use should be monitored. Due to the impact of hydroquinone, the use of hydroquinone restricted by BPOM (Food and Drug Regulatory Department in Indonesia) maximum by 0.02%. The aim of this study was to establish a new simple sensitive voltammetry method for determination of hydroquinone using screen printed carbon electrode (spce). In this study, linear concentration range, limit of detection, sensitivity and accuracy were investigated. Before the determination of parameters analysis, the method require the optimization of method parameters such as frequency and pulse height. This study were showed that the measurement of hydroquinone with square wave voltammetry method has linear concentration range 1 - 100µM, limit of detection 23.4µM, sensitivity 0.075µM/µA and accuracy 0.9969. The proposed method was succesfully applied in whitening cream cosmetic samples with good enough results.

Fabrication of Oxide Ceramic MgFe2O4 Using Iron Oxide Isolated from Lapindo Mud as a Raw Material Riska Yudhistia Asworo; Rachmat Triandi Tjahjanto; Akhmad Sabarudin
The Journal of Pure and Applied Chemistry Research Vol 2, No 3 (2013)
Publisher : Chemistry Department, The University of Brawijaya

The quite high content (28.8%) of iron oxide (Fe2O3) in Lapindo Sidoarjo`s mud promotes as a potential raw material for fabrication of oxide ceramics. The preeminence magnetic properties of iron oxide materials have led to be widely used for preparation of noteworthy products i.e semiconductor ceramics. However, the high band gap of iron oxide results in high resistivity, limiting its application as semiconductor ceramics. The addition of other oxides to iron oxide is able to reduce the energy gap of resulted oxide ceramics. Accordingly, in this study, MgO is added to Fe2O3 isolated from Lapindo mud for preparation of the oxide ceramic MgFe2O4. The products are characterized, which include crystal structure, crystal size and resistivity. It was found that the addition of MgO decreased the volume fraction of spinel structure formation, the average of crystal size, and the resistance value. The ratio MgO/Fe2O3 of 3:7 and a sintering temperature of 1300oC show the optimum composition for fabrication of MgFe2O4 with the volume fraction of 0.72 and the crystal size of 49.06 nm as characterized by XRD.

Study of Hydrogen Sulfide Adsorption on Silica Gel with Triethanolamine layer I Wayan Adi Suarya; Rachmat Triandi Tjahjanto; Ulfa Andayani
The Journal of Pure and Applied Chemistry Research Vol 11, No 1 (2022): Edition January-April 2022
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2022.011.01.653

Hydrogen sulfide (H2S) is an impurity in gaseous fuels, therefore this gas removal method is interesting topic. Physisorption method is considered to a simple work to be applied on a small scale. The principle of physisorption is the combination of a substrate and a physical solvent to capture H2S gas. This research studies the impact of the addition of liquid triethanolamine on the porous silica on the adsorption capacity of H2S gas. The silica substrate is synthesized using two pore templates namely a mixture of polyethylene glycol (PEG)/ sodium dodecyl sulphate (SDS) and the other one is pure chitosan. Silica surface was coated with triethanolamine (TEA) using impregnation method. H2S gas adsorption study was conducted on the synthesized silica with and without TEA. The results of this study show that TEA layer on the silica surface increases the adsorption capacity towards H2S gas, but it is relatively small compared to similar studies. The best result of combining TEA and silica gel is shown by TEA- sil-PS which was 3.8 x 10-5 mol H2S per gram of adsorbent. The calculated surface area of the sil-PS is 6.64 m2/g or 98.6% reduction from the initial value 451.4 m2/g. The increase in adsorption capacity despite a very large decrease in surface area indicates the effectiveness of TEA in absorbing hydrogen sulfide.

Membranes of Nata de coco-nanoparticles Fe3O4 For Diazinon Sensors Didik Pramana; Ani Mulyasuryani; Rachmat Triandi Tjahjanto
The Journal of Pure and Applied Chemistry Research Vol 7, No 3 (2018): Edition September-December 2018
Publisher : Chemistry Department, The University of Brawijaya

Development of diazinon sensors using mixed membranes of nata de coco and Fe3O4 nanoparticles on the SPCE (screen printed carbon electrode) surface has been carried out potentiometrically. The design of the sensor begins with the optimization of Fe3O4 nanoparticles added to the membranes of 50%, 67% and 75% while pH optimization using pH 4-5 acetate buffer and phosphate buffer pH 6-7. The diazinon sensor of the result has been tested at range concentration of 10-12 - 10-5mol.L-1. The results showed that the best sensor performance was 67% Fe3O4 nanoparticles and pH 5. The Nernst factor was 34.5 mV / decade, the detection limit value of 1,3 x 10-9mol.L-1 in the range concentration of 10-11 - 5x10-8 molL-1 with a response time of 140 seconds.

Photocatalytic Degradation of Methylene Blue Using TiO2-Natural Zeolite as A Photocatalyst Sri Wardhani; Moh. Farid Rahman; Danar Purwonugroho; Rachmat Triandi Tjahjanto; Christiana Adi Damayanti; Ika Oktavia Wulandari
The Journal of Pure and Applied Chemistry Research Vol 5, No 1 (2016)
Publisher : Chemistry Department, The University of Brawijaya

TiO2 - zeolite photocatalyst has been prepared by impregnation of TiO2 onto acid -activated natural zeolite. The XRD data confirmed that natural zeolite used in this work is predominated with mordenite and clinoplitolite types, whereas anatase type can be attributed to TiO2. The highest performance of TiO2 – zeolite, which is indicated by surface area of 13.304 m2/g and band gap energy of 3.15 eV, is obtained when 10 mmol of TiO2 is impregnated onto the zeolite. The ability of this photocatalyst is evaluated by examining degradation of methylene blue (MB) in the presence of UV source. The effects of MB concentration, pH and UV irradiation time on the degradation are studied in a batch reactor. It is interesting since the addition of H2O2 can improve the degradation effeciency of MB. The optimum result is achieved at pH 11, duration of UV irradiation of 50 min, showing degradation amount of 98.25 %. Surprisingly, the chemical oxygen demand (COD) in the degraded MB aqueous solution can be reduced about 77.9%, exhibiting the improvement of water quality. No loss of the activity of the degradation efficiency after reusability of this TiO2 - zeolite photocatalyst for at least 4 times.

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

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