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

Thamrin Usman

Jurusan Kimia Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Tanjungpura

Author-ID : 2857682

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

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BIOADSORPSI Fe(II) OLEH KULIT BUAH JERUK Citrus nobilis Lour. var microcarpa TERMODIFIKASI Ca(OH)2 Norvi Fatmawati; Thamrin Usman; Titin Anita Zahara
Indonesian Journal of Pure and Applied Chemistry Vol 1, No 3 (2018)
Publisher : Tanjungpura University

Pontianak peel fruit waste contains pectin, cellulose, and hemicellulose which can be used as heavy metal adsorbents by modifying using Ca(OH)2. The purpose of this study was to determine the physicochemical characteristics of calcium-modified Pontianak Citrus adsorbents (JeP-Oca), determine the maximum capacity of Fe(II) adsorption by JeP-OCa, and JeP-OCa adsorption kinetics. The characteristics of the adsorbent were analyzed using the Fourier Transformation Infra Red (FTIR) showing the functional groups of –OH and -COOH, Electron Scanning (SEM) Microscopy showing the surface structure of the canal and many irregular niches. The adsorption isotherm method with the BET model showed a large difference in porous surface area, namely 104.872 m2/g for JeP, 242.649 m2/g for JeP-ONa and 3759.745 m2/g for JeP-OCa. Optimization of the influence of pH, adsorbent mass, adsorbate concentration, and time using the column method. Adsorption isotherm followed the Freundlich isotherm model with maximum adsorption capacity value of 22.7272 mg/g. Fulfill the pseudo-order 2 reaction kinetics with a rate constant value of 4.097 L/mg. Min. The adsorption application using groundwater resulted in absorption efficiency of 82.99%.

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.

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%.

Co-Authors Dwi I. Prayitno Dwi Imam Prayitno Esi Amelyanti Fajar Nugraha Fajriaty, Inarah Hadi Kurniawan Hamdil Mukhlishin Imelda H. Silalahi Imelda Hotmarisi Silalahi M Syahwandi Mauludia Mauludia Nia Dahlia Nimas Ade Kusdayanti Norvi Fatmawati Septiani Septiani Septiani Septiani Siti Nani Nurbaeti Titin Anita Zahara Titin Anita Zahara Uray Amira Naselia Uray Amira Naselia Utin Widiatannur Winda Rahmalia

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