Article Per Year (5 Year)
p-Index From 2021 - 2026
3.035
P-Index
This Author published in this journals
All Journal VALENSI Alchemy : Journal of Chemistry Sains Natural: Journal of Biology and Chemistry QARDHUL HASAN: MEDIA PENGABDIAN KEPADA MASYARAKAT Journal of Science Innovare EKOLOGIA : Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup JKPK (Jurnal Kimia dan Pendidikan Kimia) Makara Journal of Science Helium: Journal of Science and Applied Chemistry al Kimiya : Jurnal Ilmu Kimia dan Terapan Jurnal Pengabdian Masyarakat Inovatif Jurnal Pengabdian Masyarakat Inovatif
Linda Jati Kusumawardani
Universitas Pakuan
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Social Sciences Other

Published : 28 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 28 Documents
Search

 1   2   3 
Metal Ion Complex Compound Fe(III) with Pyrazoline Derivative Ligand as Cd(II) and Zn(II) Heavy Metal Ion Sensor Based on Fluorescence Yulian Syahputri; Ani Iryani; Linda Jati Kusumawardani; Shinta Safitri
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 7, No 2 (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.v7i2.55419

Abstract

The purpose of this research is to synthesize the complex compound of ion Fe3+ with para-di-2-(1-phenyl-3-pyridyl-4,5-dihydro-1H-pyrazole-5-yl)benzene ligand and its potentials as the sensor of Cd2+ and Zn2+ heavy metal ions based on fluorescence. Complex compounds are characterized with a Fourier-Transform Infrared (FTIR) Spectrophotometer, Ultraviolet-Visible (UV-Vis) Spectrophotometer and Spectrofluorometer. Then, a complex compound fluorosensor study is conducted by adding Cd2+ and Zn2+ heavy metal ions using a UV-Vis Spectrophotometer and Spectrofluorometer. The results show that the synthesis of the complex compound formed by reacting Fe metal and pyrazoline derived ligands generates brown precipitate with a yield of 51.25% and a range of melting points of  252.2-253.2 . The result of characterization with FTIR (cm-1) generates 3380.20 (tertiary amine), 2922.31-2852.42 (C-H pyridine), 2360.38 (C=C aromatic), 1595.93-1451.88 (C=N), 1232.25-982.66 (C-N pyrazoline), 751.61-690.29 (C-H aromatic) and 366.54-339.44 (Fe-N). The Uv-Vis spectrophotometer study with a concentration of 5x10-5 M showed two absorption peaks at 246 nm, 354 nm, and 440 nm. The resulting fluorescence intensity of 813.1 a.u. at the wavelenght of 500 nm. The study of complex compound fluorescence shows that the addition of Cd2+ heavy metal ion can be made as fluorosensor with turn-on (enhancement) type, while the complex compound in the addition of Zn2+ heavy metal ion can be made as fluorosensor with turn off-on (quenching-enhancement) type.
STUDIES ON PREPARATION OF Fe(III)/TiO2 BY SOL-GEL METHOD Linda J Kusumawardani; Yulian Syahputri
Journal of Science Innovare Vol 2, No 1 (2019): Journal of Science Innovare, Volume 02 Number 01 2019
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/jsi.v2i01.1523

Abstract

In this study, Fe/TiO2 powder was synthesized by sol-gel method using mixture of Titanium Tetraisopropoxide (TTIP) as precursor and FeCl3 as iron source of 10% (w/w). The Fe/TiO2 powder was calcined at 500 °C for 1 hour. The sample of Fe/TiO2 was characterized using FTIR anad DRS measurements. FTIR analysis showed that Fe was successfully doped on TiO2 and then DRS analysis proved that the visible light was absorbed by Fe/TiO2 with its band gap energy up to 2.3 eV
FABRIKASI SEL SURYA TERSENSITASI ZAT WARNA ALIZARIN RED S BERBASIS TIO2 - NANOTUBE BERBENTUK SERBUK YANG DIPEROLEH DARI TEKNIK RAPID BREAKDOWN ANODIZATION (RBA) Linda J Kusumawardani; Jarnuzi Gunlazuardi
Ekologia: Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup Vol 16, No 2 (2016): Ekologia : Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/ekol.v16i2.733

Abstract

TiO2 semiconductor is a material that can be expected to play an important role to solve the energy crisis problem through the utilization of solar energy based on photovoltaic devices. Dye sensitized Solar Cells (DSSC) is a cheaper alternative to silicon-based photovoltaic cells. In this study, TiO2 nanotube powder is using for the DSSC fabrication process which is produced by Rapid Breakdown Anodization (RBA) technique. Alizarin red S is also used as a sensitizer and the counter electrode is prepared from a deposition of 5 mM H2PtCl­6 solution as a Pt particle on a fluorine-doped tin oxide (FTO) glass substrate. TiO2 / FTO in DSSC system characterized by FESEM, obtained TiO­2 film thickness about 1,6-1,7 μm and UV-Vis Spectrophotometer. Testing the efficiency value is measured by linear method Sweep Voltametry using potentiostat. The efficiency of converting light energy to electric current obtained is 2.63% and open circuit voltage is 361 mV. Key words : DSSC, Rapid Breakdown Anodization (RBA), Anodization, TiO2 , TiO2 Nanotube-Powder
STUDI PREPARASI TIO2 NANOTUBE SERBUK DENGAN TEKNIK RAPID BREAKDOWN ANODIZATION Linda J Kusumawardanil; Ivandini Tribidasari; Jarnuzi Gunlazuardi
Ekologia: Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup Vol 16, No 1 (2016): Ekologia : Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/ekol.v16i1.56

Abstract

Technique of Rapid Breakdown Anodization (RBA) is the new anodisasi technique introduced in 2009 as super fast synthesis methods for producing TiO2 powder. The development of this technique continues to be done in order to obtain the best quality of TiO2 powders according to the needs of the application. At this time the experiment reported the existence of the influence the granting of potential anodisasi currently underway against TiO2 powder produced good particle size, surface area and shape of the morfologinya. In addition, observations on the reaction time is also conducted to take into account the efficiency. From the results of the experiment, potential variations below 20 V, i.e., 10, 13, 14 and 15 V, it can be reported that the plate It can be transformed into the perfect TiO2 powder on electrochemical reaction of potential system 15 V for approximately 3 hours in perchloric acid media 0.15 M. Whereas the process of potential reactions on 10, 13 and 14 V does not produce TiO2 powder significantly in the time of observation for 7 hours. So further study focused on the synthesis of TiO2 powder results in a potential 15 V which will be compared with the potential 20 V, which is a potential that is used when this technique was first introduced. From the results of the experiment, reported on the potential RBA engineering 15 V produces TiO2 powder with a size outer diameter are smaller, i.e. an average of 84 nm with a more uniform particle size and surface area of the Crystal results kalsinasi at 500oC generated on 15 potential V is wider with a more uniform morphology, i.e. 69.723 g/m2 compared to 20 V , i.e. 63.824 g/m2. This will provide a significant influence in the activity of the fotokatalitik used for the fotodegradasi, as well as its application as DSSC (Dye Sensitized Solar Cells).  KeyWord  :Rapid Breakdown Anodization (RBA), Anodisasi, TiO2, TiO2 Nanotube-Serbuk
Synthesis of Ligand para-di-2-(1-phenyl-3-pyridyl-4,5-dihydro-1H-pyrazol-5-yl) benzene by Aldol Condensation Method Yulian Syahputri; Sutanto Sutanto; Linda Jati Kusumawardani
Helium: Journal of Science and Applied Chemistry Vol 1, No 1 (2021): Helium: Journal of Science and Applied Chemistry
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/helium.v1i1.2953

Abstract

Synthesis of pyrazoline derivative ligand para-di-2-(1-phenyl-3-pyridyl-4,5-dihydro-1H-pyrazol-5-yl)benzene has been successfully carried out by aldol condensation method using 2-acetyl pyridine and terephthalaldehyde in ethanol solution. The synthesis results are then reacted with excess phenyl hydrazine. The yield of ligand obtainedwas 63.10% of ayellow solid. The ligand was characterized using 1H-NMR spectroscopy, ultraviolet-visible (UV-Vis) spectroscopy, fourier transform infra-red (FTIR) spectroscopy and spectrofluorometer. The characterization with UV-Vis spectrophotometer results shows ligand has a large value of molar absorptivity (ε) at wavelength 236 nm and concentration 5x10-5 M.The results indicates that the ligand has a strong fluorescence intensity. It proved by peak emission at 467.5 nm (I = 4055 a.u).
Study of Reaction Kinetics and Identification of Clotrimazole Degradation Compounds in Anti-Fungal Cream Preparations Cellia Christiana Batubara; Ani Iryani; Linda Jati Kusumawardani
Helium: Journal of Science and Applied Chemistry Vol 1, No 2 (2021): Helium: Journal of Science and Applied Chemistry
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/helium.v1i2.4540

Abstract

Fungal infections of the skin can be treated with antifungal compounds, one of which is clotrimazole. Under certain conditions, clotrimazole can be degraded to imidazole and (o-chlorophenyl) diphenyl methanol which can cause skin irritation. This is because the storage conditions of the drug product during or after use if it is not suitable, can interfere with the stability of the drug product. Therefore, this study was conducted to obtain information regarding changes in clotrimazole levels, reaction order, reaction constant value, half-life, activation energy, and the possibility of compounds formed after the clotrimazole degradation process to determine the good storage conditions of the product. Clotrimazole levels were tested in the open and closed state of the packaging every day at different storage temperatures for three months. Changes in clotrimazole levels were measured using HPLC every week. In addition, the identification of compounds resulting from degradation was also tested using HPLC every month and continued using LC-MS/MS in the last week. The results of the analysis of clotrimazole levels, there was a decrease in levels but still in accordance with the specifications required by the Indonesian Pharmacopoeia. The greatest decrease in levels occurred in samples stored at a temperature of 40±2oC which reached 9133%. The decrease in clotrimazole levels followed a first-order reaction with the shortest half-life of 90 weeks and activation energy of 18.9 kJ/mol. Identification of the degraded compounds using HPLC and LC-MS/MS found imidazole compounds and (o-chlorophenyl) diphenyl methanol in samples stored at 25±2oC and 40±2oC. These compounds can cause skin irritation, but these compounds may not have a serious impact because they have a fairly large body threshold value of 220 mg/kg. This shows that clotrimazole cream stored at various temperatures, both at 5±2oC, 25±2oC, and 40±2oC can still be used for three months after the packaging is opened according to the in-use shelf life.
Modification of Zeolite Made from Coal Fly Ash with TiO2: Effect of Aging Time on Physical and Optical Properties Kusumawardani, Linda Jati; Iryani, Ani; Sinaga, Ennita Lusiana
Makara Journal of Science Vol. 27, No. 1
Publisher : UI Scholars Hub

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

Abstract

The high levels of metal oxides, SiO2, and Al2O3 give coal fly ash the potential for development into zeolite. Zeolite was prepared from fly ash by combining alkaline fusion with hydrothermal treatment. Using this method results in a high surface area, high mechanical properties, and high crystallinity of the sample. Zeolite as a product is modified by TiO2. This study was intended to determine the effect of the operating process in zeolite synthesis from coal fly ash on the types and properties of zeolite and the effect of the aging time of TiO2-modified zeolite at 14, 16, and 20 h. Investigating its physical and optical properties shows that the product contains zeolite X as the major phase. The zeolite X itself contains 96% crystallinity and a specific surface area of 164.78 m2/g. Meanwhile, TiO2/zeolite increases the light absorption in the visible region. Diffuse reflectance spectroscopy showed that a 14 h aging time results in the lowest band gap energy of 2.50 eV and the largest surface area of 189.483 m2/g. X-ray diffraction characterization found that TiO2/zeolite is an anatase crystal (~9 nm) with 99% crystallinity. A pilot examination of the photodegradation performance of the TiO2/zeolite nanocomposite was evaluated using 5 mg/L methylene blue and compared with that of zeolite alone.
STRATEGI PEMASARAN ONLINE DAN INOVASI RASAN (RASA DAN KEMASAN) BAKSO CAH SOLO SEBAGAI UPAYA PENINGKATAN OMSET DI ERA NORMAL BARU Kusumawardani, Linda Jati; Siti Warnasih; Irma Anggraeni
Qardhul Hasan: Media Pengabdian kepada Masyarakat Vol. 10 No. 1 (2024): APRIL
Publisher : Universitas Djuanda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30997/qh.v10i1.4731

Abstract

Bakso Cah Solo (CS) merupakan salah satu UMKM (Usaha Mikro Kecil Menengah) yang terdampak secara ekonomi akibat wabah Covid-19. Kedai usaha yang berlokasi di Kecamatan Cileungsi, Kabupaten Bogor saat ini mengalani penurunan aktivitas jual beli akibat dampak penerapan PSBB pada seluruh lapisan masyarakat. Dalam kurun waktu enam bulan terakhir omsetnya menurun hingga 46,67% per bulan. Oleh karena itu, diperlukan strategi yang tepat untuk meningkatkan omset penjualan. Strategi akan difokuskan pada dua hal utama, yaitu pemasaran secara digital berbasis Less Contact Economy (LCE) dan inovasi RASAN (Rasa dan Kemasan). Strategi pemasaran dan distribusi produk dilakukan dengan cara pembuatan website, media sosial, dan pemanfaatan aplikasi ojek online yang diharapkan dapat meningkatkan jumlah konsumen melalui distribusi produk yang lebih luas dan tidak terbatas di daerah Cileungsi. Strategi kedua adalah melakukan inovasi berupa bakso dalam bentuk beku (frozen) dan menambah minimal empat varian rasa (keju, mozzarella, granat dan rusuk). Hal ini akan meningkatkan minat konsumen untuk mencoba produk-produk tersebut, sehingga target pasar akan meluas, konsumen meningkat sampai kalangan millennial. Berdasarkan strategi yang dilakukan, luaran kegiatan ini yaitu peningkatan kemampuan mitra dalam berjualan secara online, peningkatan jenis produk, peningkatan omset, dan peningkatan daya saing mitra melalui branding dan penjualan online.
Photodegradation Of Methyl Orange (MO) Using TiO2/Zeolite From Coal Fly Ash Waste Under Acidic Conditions and H2O2 Addition Prakoso, Muhamad Iqbal; Maharani, Khairy Yunda; Ariq, Muhammad Rizki; Indah, Amalia Nurul; Apriansyah, Apriansyah; Iryani, Ani; Kusumawardani, Linda Jati; Syahputri, Yulian
Helium: Journal of Science and Applied Chemistry Vol 4, No 1 (2024): Helium: Journal of Science and Applied Chemistry
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/helium.v4i1.9503

Abstract

This study aims to degrade methyl orange dye by a photocatalytic method using TiO2/zeolite nanocomposite. The zeolite used is sourced from coal waste fly ash. While the TiO2/Zeolite nanocomposites were synthesized by the sol-gel method and analyzed using UV-Vis DRS to determine the band gap energy. The band gap energy obtained from calculation results of the Kubelka-Munk formula shows a value of 2.0 eV. This indicates that the working area of methyl orange photodegradation using TiO2/zeolite is in visible light. Optimization of the methyl orange photodegradation process in this study will be carried out in an acidic environment by varying the nanocomposite dose (0.05; 0.1; 0.2; 0.3; and 0.4 g) and the length of time of irradiation (15; 30; 45; 60; and 75 minutes). This study also conducted a study on the effect of adding H2O2. The optimum yield of percent degradation (%D) of methyl orange (MO) obtained was 98.37% from initial concentration 10 mg/L to 0,16 mg/L with varying doses of TiO2/zeolite 0.1 g and 30 minutes in an acidic environment and the addition of H2O2.
Application of Electrocoagulation in Soy Milk Wastewater Treatment Process with Variation of Time and Voltage Apriyanti, Mahyuni; Sutanto, Sutanto; Kusumawardani, Linda Jati
Helium: Journal of Science and Applied Chemistry Vol 3, No 2 (2023): Helium: Journal of Science and Applied Chemistry
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/helium.v3i2.8923

Abstract

Processing of soymilk liquid waste is carried out using the batch system electrocoagulation method. Variations in processing time are 20, 40, 60, 80, 100, and 120 minutes. The plate used is an aluminum plate measuring 10×5 cm. The electrode distance was 2 cm with an electrical voltage of 10 and 30 volts. The results of this research show that the best electrocoagulation process can reduce COD levels by 64.70%, TSS by 72.90% and increase the pH value to 5.17, however COD, TSS and pH levels are still above standard quality. Initial analysis results of soymilk wastewater with pH 4.06, COD 34408 mg/L, TSS 1550 mg/L, DO 0.30 mg/L, DHL 1090 μS/cm and Al 54.95 mg/L. After carrying out the electrocoagulation process, the pH value was 5.17, COD 12144 mg/L, TSS 420 mg/L, DO 0.37 mg/L, DHL 648 μS/cm and Al 231.33 mg/L at a voltage of 30 V with time. electrocoagulation 120 minutes.
Co-Authors . Apriansyah Ade Heri Mulyati, Ade Heri Ani Iryani Apriyanti, Mahyuni Ariq, Muhammad Rizki Cellia Christiana Batubara Damayanti, Elok Diana Widiastuti Fauziah, Zahra Nur Hermawan, Ujang Indah, Amalia Nurul Irma Anggraeni Iryani, Ani Ivandini Tribidasari Anggraningrum Jarnuzi Gunlazuardi Juniansyah, Ronaldo Leny Heliawati Maharani, Khairy Yunda Muhammad Fathurrahman Muhammad Rizki Saputra, Muhammad Rizki Nurlela Nurlela Prakoso, Muhamad Iqbal Shinta Safitri Sinaga, Ennita Lusiana Siti Warnasih Sutanto Sutanto Sutanto Sutanto Uswatun Hasanah Widdyanti, Tutik Yulian Syahputri