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All Journal VALENSI Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan POSITRON Jurnal Riset Kimia Indonesian Journal of Pharmaceutical Science and Technology Jurnal Kelautan Tropis Journal Of Chemical Process Engineering (JCPE) ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Pure and Applied Chemistry

Winda Rahmalia

1. Jurusan Kimia, Fakultas MIPA, Universitas Tanjungpura 2. Chemistry Insight Center Fakultas MIPA, Universitas Tanjungpura

Author-ID : 2589714

Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Medicine & Pharmacology Physics

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ADSORPSI ASAM LEMAK BEBAS PADA CRUDE PALM OIL MENGGUNAKAN ZEOLIT TERAKTIVASI K2CO3 Nia Dahlia; Winda Rahmalia; Thamrin Usman
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 3 (2019)
Publisher : Tanjungpura University

Research on the use of K2CO3-activated zeolite as an adsorbent for free fatty acid (FFA) adsorption on crude palm oil (CPO) has been done. CPO is one of the mainstay products of Indonesian plantations which are used as raw material for cooking oil. The aim of this study to determine the adsorption capacity of activated zeolites against free fatty acid of CPO. The results showed that the iodium uptake capacity of zeolites before activation was 495.6%, activated zeolites were 527.1% and impregnated zeolites were 642.6%. The number of zeolites with the best absorption was 2 grams and ALB was absorbed 4.079% for activated zeolites (ZAA), 4.98% for impregnated zeolites (ZAI), and the water content and impurities were still below SNI standards. The CPO adsorption process with zeolites shows the Langmuir model with a correlation value (R2) of 0.9999 for ZAA and (R2) of 0.9976 for ZAI. The results showed that activated zeolites had lower absorption than impregnated zeolites.

PENGARUH JENIS MINYAK TERHADAP SIFAT FISIK D AN KIMIA BATH BOMB (THE EFFECT OF THE TYPE OIL ON THE PHYSICAL AND CHEMICAL PROPERTIES OF BATH BOMB) Annisa Bella Maharani; Lia Destiarti; Nurlina Nurlina; Intan Syahbanu; Winda Rahmalia
Indonesian Journal of Pure and Applied Chemistry Vol 3, No 1 (2020)
Publisher : Tanjungpura University

Bath bombs were produced with ten different types of oil to determine the effect of the oil used on their physical and chemical properties. Bath bombs were prepared by mixing the dry ingredients first (citron, cornstarch, baking soda) and stirring until all the ingredients were well blended. Then, mixed the wet ingredients (water, oil, perfume ore, food coloring) into the beaker. After that, the wet ingredients were poured gradually into the dry dough, and this step was done until all the wet ingredients run out, and the texture of the bath bomb dough was slightly moist so that it can be put in the mold. Finally, the bath bomb is printed and tested in a laboratory. The result showed that the difference in essential oils used in the manufacture of bath bombs does not affect the pH of the bath bomb but affects the stability of the resulting foam. The acceptability test results showed that the resulting bath bomb provided a sensation of freshness and relaxation and did not cause allergies. Based on the SWOT analysis results, these bath bombs can advance and develop by implementing a vertical integration strategy

UJI KELARUTAN LOGAM DARI TAILING TIMAH MENGGUNAKAN PELARUT EUTEKTIK BERBASIS KOLIN KLORIDA DAN ASAM p-TOLUENASULFONAT Nimas Ade Kusdayanti; Winda Rahmalia; Thamrin Usman
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 2 (2019)
Publisher : Tanjungpura University

Deep eutectic solvents (DES) are defined as combinations of two or three components which are able to establish hydrogen bond interactions with each other to form an eutectic mixture, that have a melting point lower than that of the each individual component. This study aims to determine the characteristics of DES based on choline chloride (ChCl) as quaternary ammonium salts and p-toluenasulfonic acid (PTSA) as hydrogen bond donors and to investigate their selectivity for dissolving metals in tin tailings. Synthesis of DES was carried out by mixing ChCl and PTSA with variations of the mole fraction, then stirring at 80 oC for 15 minutes. Resulted products were characterized their freezing point, density, viscosity, conductivity and functional groups. Mixture with a mole fraction of ChCl 0.6 formed homogeny clear liquid. It has a freezing point of 8 oC, density of 1.207 g/mL, viscosity of 4.663 cP, and conductivity of 182.4 mS/cm. Based on fourier transform infrared (FTIR) analysis, the interaction between ChCl and PTSA was due to the formation of hydrogen bonds between the O atoms of PTSA and the H atoms of ChCl. Inductively coupled plasma atomic emission spectroscopy (ICP-AES) analysis showed the presence of 1962 ppm of Fe metal dissolved in DES. This value was significant greater than the presence of other metals in the DES.

ADSORPSI ASAM LEMAK BEBAS DALAM MINYAK SAWIT MENTAH MENGGUNAKAN ADSORBEN ABU TANDAN KOSONG SAWIT M Syahwandi; Winda Rahmalia; Titin Anita Zahara; Thamrin Usman
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 3 (2019)
Publisher : Tanjungpura University

Research on the use of the oil palm empty fruit bunch (OPEFB) as an adsorbent for free fatty acid (FFA) adsorption on Crude Palm Oil (CPO) has been done. CPO is the main raw material in the manufacture of food products. The results of OPEFB adsorbent characteristics showed the amount of water content and ash content of 0,067% and 0,175%, XRF analysis obtained the greatest content of OPEFB in the form potassium metal as much as 44,24%, FTIR analysis identified that there were CO3 compounds in wave number 1648 cm-1 and SEM analysis indicates there are no pores in OPEFB. The result showed that the number of OPEFB with the best adsorption was 0,1 gram with 60 minute optimum contact time. The CPO adsorption process with OPEFB shows the Langmuir model with a correlation value (R2) of 0,8845 and the adsorptions kinetics follows the pseudo order 2 adsorption kinetics model with a correlation value (R2) of 0,9857. The results of this study showed the characteristics of CPO before and after adsorbed using 0,1 g of adsorbent OPEFB showed the amount of FFA level of 7,321% to 6,297%, water content of 0,0025% to 0,00119% and impurities content of 0,8847% to 0,8408%.

ADSORPTION OF Pb(II) BY POLYANILINE/SILICA GEL COMPOSITE: KINETICS AND ISOTHERM STUDIES Mas Inda Putrinesia; Nurlina Nurlina; Winda Rahmalia
Indonesian Journal of Pure and Applied Chemistry Vol 1, No 3 (2018)
Publisher : Tanjungpura University

Research on the study of kinetics and isotherm adsorption of Pb(II) by polyaniline/silica gel (PANI/SiO2) composite from glass waste has successfully been done. The polymerization of silica gel was prepared by sol-gel process. Meanwhile, PANI/SiO2 composite was prepared using sulfuric acid (H2SO4) as its dopants and hydrogen peroxide (H2O2) for oxidation process. Composition of oxide compound in PANI/SiO2 composite was analyzed by X-Ray Fluorosence (XRF) and Gas Sorption Analyzer (GSA). Adsorption of Pb(II) was carried out by contacting PANI/SiO2 with Pb(NO3)2 solution for 20, 40, 60 and 80 minutes, with concentrations of 150, 200, 250, 300, 350 and 400 mg/L. The optimum contact time was reached at 40 minutes. This adsorption followed pseudo-second order model with R2= 0.996. The first optimum adsorption capacity was reached in the concentration of 250 mg/L. Isotherm adsorption followed Langmuir models with R2= 0.954 (monolayer capacity= 51.02 mg/g).

Preparasi dan Karakterisasi Komposit TiO2/Metakaolin Teraktivasi KOH dalam Upaya Menurunkan Energi Celah Pita pada Anoda TiO2 Wahyu Febri Ramadhy; Winda Rahmalia; Thamrin Usman
POSITRON Vol 10, No 1 (2020): Vol. 10 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

TiO2 (titanium dioksida) merupakan satu di antara material semikonduktor yang banyak dipelajari karena sifat optik dan elektroniknya yang baik. Secara struktur, TiO2 mempunyai tiga fase kristal yaitu anatase, rutile, dan brookite. Dari ketiga fase tersebut, anatase lebih diminati untuk fotokatalisis. Namun, energi celah pita (band gap) dari fase ini (3,2 eV) sedikit lebih besar daripada fase rutile (3,0 eV) sehingga diperlukan perlakuan lebih lanjut untuk menurunkan energi celah pita material ini. Dalam penelitian ini, telah dilakukan sintesis komposit TiO2 dengan variasi penambahan metakaolin teraktivasi KOH (MK-OH) menggunakan metode sol-gel. Sifat fundamental yang meliputi gugus fungsi dan energi celah pita dari komposit TiO2/MK-OH juga dikaji. Berdasarkan hasil analisis X-Ray Diffraction (XRD) dan X-Ray Fluorescence (XRF) dari MK-OH yang digunakan dalam penelitian ini, diketahui adanya puncak difraksi pada 2 = (12,34o; 20,85o; 25,52o; 26,59o) yang menunjukkan kandungan mineral kaolinit dan kuarsa dengan rasio Si/Al sebesar 1,614. Hasil analisis Fourier Transform Infrared (FTIR) juga menunjukkan adanya puncak pada bilangan gelombang 686-700 (Si-O-Si); 946-947 (Si-O-Ti); 1630 (-OH); 3330 (-OH) cm-1. Selain itu, berdasarkan analisis Diffuse Reflectance – Ultraviolet (DR-UV) diketahui bahwa energi celah pita terendah dimiliki oleh komposisi 5% MK-OH sebesar 3,05 eV.

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).

Determination of Optimum Conditions for Synthesis of Methyl Ester from Bleached Crude Palm Oil Using Sn-Zeolite and Red Mud Catalysts Esi Amelyanti; Thamrin Usman; Winda Rahmalia
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 20, No 2 (2023): July 2023
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v20i2.267-279

Methyl esters synthesis from bleached crude palm oil (BCPO) containing 0.36 and 20.86% of free fatty acids using Sn-zeolite and red mud has been done. This study aims to determine the esterification, transesterification, and transesterification-esterification simultaneous reactions optimum conditions when using Sn-zeolite, red mud, and Sn-zeolite-red mud mixture catalysts. The X-ray diffraction and Fourier transform infrared analysis results show that Sn has been impregnated on zeolite, indicated by cassiterite and Sn-O-Sn vibrational peaks in Sn-zeolite. The main component of red mud is NaCO3, indicated by analcite and carbonate peaks. Thin-layer chromatography results in the transesterification showed that red mud catalyst could totally convert triglycerides from BCPO to methyl ester when 5% catalyst, 3 hours, and CPO:methanol mole ratio 1:20 were used. In esterification, Sn-zeolite can synthesize methyl ester from low-quality CPO when using CPO:methanol mole ratio 1:20 for 3 hours, however, the conversion was not total. In the transesterification-esterification simultaneous, the conversion was also not total which the best reaction conditions at mixing Sn-zeolite:red mud 1.5:1 (w/w), 7% catalyst, and CPO:methanol mole ratio 1:20 for 3 hours. This study shows that esterification and transesterification processes can be carried out simultaneously at a particular mass ratio of Sn-zeolite and red mud.

Formulasi dan Uji Aktivitas Krim Pengkelat Merkuri Berbahan Dasar Ekstrak Etanol Alga Coklat (Sargassum sp.) Inda Putrinesia; Yoga Pratama; Nurul Asyikin; Winda Rahmalia
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 1 (2018): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.1.12242.152-163

Telah dilakukan penelitian tentang formulasi dan uji aktivitas krim pengkelat merkuri berbahan dasar ekstrak etanol alga coklat (Sargassum sp.) telah dilakukan. Krim diformulasikan dengan beberapa bahan seperti vaselin, gliserol, asam askorbat, karbomer, setil alkohol, dan NaOH. Parameter yang dievaluasi diantaranya organoleptik krim, homogenitas, pH, daya sebar, tipe krim, iritasi kulit, dan daya tercuci krim. Aktivitas pengkelatan diamati dengan menganalisis kandungan merkuri pada kulit tikus yang sebelumnya diberikan krim bermerkuri dibandingkan dengan kulit tikus yang telah dioleskan krim pengkelat merkuri berbahan dasar ekstrak etanol alga coklat. Spektrum Fourier Transform Infrared Spectroscopy (FT-IR) menunjukkan bahwa ekstrak etanol alga coklat diindikasikan mengandung glutation. Berdasarkan parameter evaluasi krim, formulasi terbaik adalah krim dengan komposisi ekstrak alga coklat sebanyak 0,035% w/v terhadap volume krim, yang ditandai dengan krim yang berbentuk gel kental dan tidak berbau serta memiliki tekstur seperti krim wajah pada umumnya, yaitu lembut dan sedikit berminyak. Krim bersifat homogen dan stabil hingga hari ke 21 percobaan dengan pH=5. Krim juga tidak menimbulkan iritasi dan dapat tercuci habis tanpa bekas. Hasil analisis AAS membuktikan bahwa penggunaan krim pengkelat merkuri berbahan dasar esktrak etanol alga coklat selama kurang dari 2 minggu dengan dosis pemberian 1 kali sehari mampu menyerap merkuri pada tikus dengan aktivitas penyerapan sebesar 50%.Formulation and Activity Test of Mercury Chelator Cream of Ethanol Extract of Brown Algae (Sargassum Sp.). Research on the study of formulation an activity test of mercury chelator cream from ethanol extract has successfully done. The cream was formulated with ingredients such as vaseline, glycerol, ascorbic acid, carbomer, cetyl alcohol, and sodium hydroxide. Parameters were evaluated against organoleptic, homogenity, pH, dispersion type of cream, skin irritation test and washing test. The mercury chelating activity was observed by analyzing mercury concentration in mercury induced mouse skin. The FTIR spectrum shows that ethanol extract of brown algae was dominated by glutathione functional group. The best cream formulation was composed by 0,035% (w/v) brown algae, formed as a creamy gel that was thick and odorless and had a texture like soft facial cream in general with slightly oily.The cream was homogeneous and stable until the 21st day of the experiment with pH = 5. The cream produced no skin irritation and could be washed out without a trace. The results of AAS analysis proved that the use of brown algae ethanol extract-based mercury chelating cream for less than 2 weeks with a dose of 1 time a day could absorb mercury in mouse skin with absorption activity of 50%.

SINTESIS GEOPOLIMER DENGAN BAHAN DASAR KAOLIN CAPKALA SEBAGAI ADSORBEN ION Pb(II) DALAM LARUTAN (SYNTHESIS OF GEOPOLYMERS WITH BASE MATERIALS KAOLIN CAPKALA AS ADSORBENT ION Pb(II) IN SOLUTION) Nur Ridha An Nisa; Intan Syahbanu; Winda Rahmalia; Nurlina Nurlina
Indonesian Journal of Pure and Applied Chemistry Vol 6, No 2 (2023)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v6i2.62731

Geopolymer synthesis was carried out using kaolin, for the adsorption of Pb (II) ions in solutions. Kaolin is used by Kaolin Capkala from Bengkayang Regency, West Kalimantan. This kaolin was first modified into metakaolin. The scaling up of geopolymers is carried out by making an activating solution, namely by mixing NaOH and Na2SiO3. The activating solution is mixed into metakaolin. The mass composition of each component in the geopolymer: metakaolin of 94,5 grams, Na2SiO3 of 57 grams, NaOH of 12 grams, and H2O of 30 grams. The formed geopolymers are tested for their adsorption ability against Pb(II) ions. The research results show the success of geopolymer formation as indicated by FTIR and XRD characterization results. Based on the FTIR results, several indications of successful geopolymer formation are seen in the shift and widening of the Si-O absorption peak at wave number 1109 cm-1 for kaolin to 1058 cm-1 for metakaolin and 1016 cm-1 for geopolymer; the appearance of O-C-O bond absorption in CO32- at 1362 cm-1 in geopolymer; and a shift in absorption of Al-O (Al (VI), wherein kaolin it is indicated by a wave number of 536 cm-1 while in metakaolin it is characterized by a wave number of 544 cm-1 and for geopolymer a wave number of 553 cm-1 indicates it. XRD diffractogram of the formation hump's appearance shows the amorphous characteristics of metakaolin and geopolymer at around 2θ 26o-35o. The application of geopolymer for Pb adsorption shows that Pb(II) can be adsorbed well in geopolymers with the maximum adsorption capacity of 2.77 mg/ g obtained at various concentrations of 40 ppm.

Co-Authors Adhitiyawarman, Adhitiyawarman Angie Islammiyati Annisa Bella Maharani Ayu Widya Sari Deni Pranata Dwi I. Prayitno Esi Amelyanti Fajar Nugraha Fajriaty, Inarah Gusrizal Gusrizal Hadi Kurniawan Hairunnisa Hairunnisa Hamdil Mukhlishin Imelda Hotmarisi Silalahi Inda Putrinesia Intan Syahbanu Intan Syahbanu Intan Syahbanu Lia Destiarti M Syahwandi Mas Inda Putrinesia Mauludia Mauludia Nia Dahlia Nico Gustian Nimas Ade Kusdayanti Nur Ridha An Nisa Nurlina Nurlina Nurlina Nurlina, Nurlina Nurul Asyikin Prayitno, Dwi Imam Puji Ardiningsih Ramadhy, Wahyu Febri Risya Sasri Sabrina Maulidya Amir Septiani Septiani Septiani Septiani Septiani Siti Nani Nurbaeti Thamrin Usman Thamrin Usman Titin Anita Zahara Titin Anita Zahara Titin Anita Zaharah Uray Amira Naselia Uray Amira Naselia Utin Widiatannur Wahyu Febri Ramadhy Yoga Pratama Zulenda Zulenda

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