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Adsorpsi Logam Cu dengan Graphene Oksida Raihan Nurfauziah; Zulfa Rahmah Fadillah; Sinta Setyaningrum; Eko Andrijanto
Jurnal Kimia Fullerene Vol 6 No 2 (2021): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v6i2.326

The development of industry around the river causes an increase in pollutants flowing in the river. One type of industrial pollutant is heavy metals. Heavy metals are toxic and toxic, so the presence of heavy metals in the aquatic environment can damage aquatic ecosystems. One of the ways to remove heavy metals is by using the isotherm adsorption method. Namely the process where the absorption of heavy metals on the surface of solids, namely the adsorbent. The adsorbent used is a graphene oxide sand composite which is made from carbon and has a high potential to remove heavy metal pollutants. The experiment was carried out by mixing the adsorbent with a solution of Cu2+ metal ions and adsorption was carried out using several parameters, namely variations in contact time and adsorption pH and measurements were made using a visible spectrophotometer. Optimum absorption occurs at the 25th minute contact time with an efficiency of 96.2% and at an adsorption pH of 8 with an efficiency of 99.4%. So it can be concluded that graphene oxide sand composite can be used to remove heavy metal pollutants.

Sintesis dan Karakterisasi Lithium Iron Phosphate (LiFePO4) Menggunakan Metoda Solid State Reaction Sebagai Katoda Pada baterai Lithium-Ion Oki Putra; Rusdan Fadila; Eko Andrijanto; Dian Ratna Suminar
Fluida Vol 14 No 2 (2021): FLUIDA
Publisher : Jurusan Teknik Kimia, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v14i2.2632

ABSTRAK Perkembangan baterai tak luput dari kebutuhan energi yang kian meningkat. Meskipun sumber energi tidak terpaku pada baterai, namun baterai banyak diminati karena dapat menampung cukup banyak energi, relatif aman, dan bersifat portable. Penelitian ini bertujuan untuk mensintesa dan mengetahui karakteristik salah satu jenis katoda baterai lithium-ion yaitu Lithium Iron Phosphate (LiFePO4) dengan variasi mol reagent berdasarkan perbandingan stoikiometri dan suhu proses kalsinasi 600°C, 700°C, dan 800°C selama 3x3 jam menggunakan metode solid state reaction dengan Li2SO4.H2O, FeSO4.7H2O, dan KH2PO4 sebagai reagent. Produk hasil kalsinasi 800°C dengan variasi 0.1 mol dijadikan sampel untuk dianalisa dan dikarakterisasi karena memiliki penurunan berat endapan BaSO4 tertinggi. Hasil karakterisasi menggunakan FTIR menunjukan gugus fungsi P-O yang cukup kuat, sementara hasil karakterisasi menggunakan SEM/EDX menunjukan partikel yang terbentuk memiliki ukuran sekitar 160nm hingga 14µm dan terdapat atom S yang merupakan impurities dalam produk. Pola difraksi hasil uji XRD menunjukan terbentuknya sejumlah fasa seperti LiFePO4, LiFeP2O7, dan Li3PO4. ABSTRACT The development of batteries is inseparable from the increasing energy needs. Although energy sources are not available for batteries, batteries are in great demand because they can store a lot of energy, are relatively safe, and are portable. This study aims to synthesize and determine the characteristics of one type of lithium-ion battery cathode, namely Lithium Iron Phosphate (LiFePO4) with various mole reagents based on stoichiometric ratios and calcination process temperatures of 600oC, 700oC, and 800oC for 3x3 hours using the solidstate reaction method with Li2SO4.H2O, FeSO4.7H2O, and KH2PO4 as reagents. The 800oC calcined product with 0.1 mol variation was sampled for analysis and characterization because it had the highest weight loss of BaSO4 deposits. The results of characterization using FTIR showed that the functional group P-O are quite strong, while the results of characterization using SEM/EDX showed that the particles formed had a size of about 160nm to 14µm and contained S atoms which were impurities in the product. The diffraction pattern of XRD test results shows the formation of phase numbers such as LiFePO4, LiFeP2O7, dan Li3PO4.

Optimasi Suhu Reaksi Sintesis Senyawa LiFePO4 Menggunakan Prekursor Lithium Sulfat Sebagai Sumber Ion Lithium Rispiandi; Eko Andrijanto
Fluida Vol 15 No 1 (2022): FLUIDA
Publisher : Jurusan Teknik Kimia, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v15i1.3700

ABSTRAK Dengan meningkatnya kebutuhan akan konsumsi energi, maka semakin meningkat pula kebutuhan akan peralatan untuk mengkonversi energi dan menyimpannya, seperti baterai lithium. Lithium-ion batteries (LIBs) menjadi salah satu alat yang paling mendapat perhatian karena dianggap memiliki densitas energi yang tinggi. Senyawa LiFePO4 (LIPO) mulai dilirik sebagai alternatif yang paling cocok menggantikan LiCoO2 sebagai katoda pada baterai lihium karena memiliki stabilitas termal yang tinggi. Pada penelitian ini, dipelajari pengaruh kondisi reaksi sintesis LiFePO4 menggunakan metode solid state reaction yang dioptimasi dengan memvariasikan suhu kalsinasi. Bahan baku yang digunakan adalah Li2SO4. H2O , FeSO4. 4H2O dan NH4PO4 dengan ratio molar 1:1:0,5. Sintesis dengan metode solid state reaction ini dilakukan dengan memvariasikan suhu kalsinasi 600o, 650o dan 700 oC selama 5 jam untuk membentuk fase kristalin LiFePO4. Difraktogram LiFePO4 hasil sintesis dibandingkan dengan difraktogram standar LiFePO4 - JCPDS 40-1499. Ketiga variasi suhu ini menghasilkan difraktogram yang sangat identik dengan standar LiFePO4, namun demikian pada suhu 700 oC dianggap menjadi kondisi yang optimum untuk menghasilkan LiFePO4 dengan tingkat kemiripan yang lebih baik dengan LiFePO4 rujukan atau standar. Li2SO4 adapat dijadikan precursor sumber lithium dalam sintesis material LiFePO4. ABSTRACT The increasing for energy consumption, the need for electrical devices to convert energy and store it also increases, such as lithium ion battery. Lithium-ion batteries (LIBs) have received the wide attention because they are considered to have high energy density. LiFePO4 (LIPO) compounds are starting to be regarded as the most suitable alternative to replace LiCoO2 as a cathode in lithium ion batteries because it has high thermal stability. In this study, the reaction conditions for the synthesis of LiFePO4 utilized the solid state reaction method which was optimized by varying the calcination temperature was examined. The raw material used in this synthesis is Li2SO4. H2O, FeSO4. 4H2O and NH4PO4 with a molar ratio of 1:1:0.5. The synthesis method was carried out at high temperature calcination of 600o, 650o and 700oC for 10 hours to form a crystalline LiFePO4 phase. The synthesized LiFePO4 diffractogram was compared with the diffractogram standard of LiFePO4 - JCPDS 40-1499. These three temperature variations resulted in diffractogram that was very identical to the standard LiFePO4, however at 700oC it was considered to be the optimum condition to produce LiFePO4 with a better similarity to the reference LiFePO4. The Li2SO4 can be utilized as a precursor of ion sources in the synthesis of cathode material LiFePO4.

Optimasi Suhu Reaksi Sintesis Senyawa LiFePO4 Menggunakan Prekursor Lithium Sulfat Sebagai Sumber Ion Lithium Rispiandi Rispiandi; Eko Andrijanto
Fluida Vol 15 No 1 (2022): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v15i1.3700

ABSTRAK Dengan meningkatnya kebutuhan akan konsumsi energi, maka semakin meningkat pula kebutuhan akan peralatan untuk mengkonversi energi dan menyimpannya, seperti baterai lithium. Lithium-ion batteries (LIBs) menjadi salah satu alat yang paling mendapat perhatian karena dianggap memiliki densitas energi yang tinggi. Senyawa LiFePO4 (LIPO) mulai dilirik sebagai alternatif yang paling cocok menggantikan LiCoO2 sebagai katoda pada baterai lihium karena memiliki stabilitas termal yang tinggi. Pada penelitian ini, dipelajari pengaruh kondisi reaksi sintesis LiFePO4 menggunakan metode solid state reaction yang dioptimasi dengan memvariasikan suhu kalsinasi. Bahan baku yang digunakan adalah Li2SO4. H2O , FeSO4. 4H2O dan NH4PO4 dengan ratio molar 1:1:0,5. Sintesis dengan metode solid state reaction ini dilakukan dengan memvariasikan suhu kalsinasi 600o, 650o dan 700 oC selama 5 jam untuk membentuk fase kristalin LiFePO4. Difraktogram LiFePO4 hasil sintesis dibandingkan dengan difraktogram standar LiFePO4 - JCPDS 40-1499. Ketiga variasi suhu ini menghasilkan difraktogram yang sangat identik dengan standar LiFePO4, namun demikian pada suhu 700 oC dianggap menjadi kondisi yang optimum untuk menghasilkan LiFePO4 dengan tingkat kemiripan yang lebih baik dengan LiFePO4 rujukan atau standar. Li2SO4 adapat dijadikan precursor sumber lithium dalam sintesis material LiFePO4. ABSTRACT The increasing for energy consumption, the need for electrical devices to convert energy and store it also increases, such as lithium ion battery. Lithium-ion batteries (LIBs) have received the wide attention because they are considered to have high energy density. LiFePO4 (LIPO) compounds are starting to be regarded as the most suitable alternative to replace LiCoO2 as a cathode in lithium ion batteries because it has high thermal stability. In this study, the reaction conditions for the synthesis of LiFePO4 utilized the solid state reaction method which was optimized by varying the calcination temperature was examined. The raw material used in this synthesis is Li2SO4. H2O, FeSO4. 4H2O and NH4PO4 with a molar ratio of 1:1:0.5. The synthesis method was carried out at high temperature calcination of 600o, 650o and 700oC for 10 hours to form a crystalline LiFePO4 phase. The synthesized LiFePO4 diffractogram was compared with the diffractogram standard of LiFePO4 - JCPDS 40-1499. These three temperature variations resulted in diffractogram that was very identical to the standard LiFePO4, however at 700oC it was considered to be the optimum condition to produce LiFePO4 with a better similarity to the reference LiFePO4. The Li2SO4 can be utilized as a precursor of ion sources in the synthesis of cathode material LiFePO4.

Pemodelan Kesetimbangan Massa pada Keadaan Tunak (Steady) sebagai Penentuan Konsentrasi Optimum Tawas (Alumunium Sulfate) pada Proses Penurunan Kadar Fe pada Sumber Air Tercemar Alfiana Adhitasari; Eko Andrijanto
Jurnal Teknik Kimia dan Lingkungan Vol. 4 No. 2 (2020): October 2020
Publisher : Politeknik Negeri Malang

Air tanah merupakan andalan sumber mata air bagi masyarakat pada umumnya, beberapa sumber air tanah sering dijumpai air yang masih terkandung Fe, hal tersebut berdampak buruk bagi kesehatan oleh karena itu perlu dilakukan penuruan kadar Fe pada air sebelum digunakan. Beberapa metode yang umum dilakukan untuk menghilangkan kandungan Fe pada air adalah dengan cara koagulasi oleh tawas. Penelitian ini akan memodelkan sebuah persamaan matematika yang dapat mengkuantifikasi penurunan kadar Fe pada setiap fungsi kosentrasi tawas yang ditambahkan. Model matematika pada penelitian menggunakan penurunan rumus dari kesetimbangan masa. Dari hasil perbandingan data percobaan dengan data perhitungan didapat konstanta penurunan Fe (kF) pada fungsi konsentrasi tawas sebesar 1.8/mg tawas dan nilai konstanta R2 sebesar 0.935, dari data tersebut maka model matematika yang dibuat dapat mewakili fenomena proses penurunan Fe di lapangan. In general groundwater is relied as source water but somtimes we found precense of Fe in some of groundwater products that could harm our health due to its toxicity, therefore it is necessary to reduce Fe content as pretreatment process. Some common methods to reduce Fe content in water are coagulation by alum. This study will build a mathematical equation to quantify the reduction of Fe content in function of alum concentration. In this study the equations were derive from mass balance equation. By comparing the experimental data with calculated data, we obtained kF (The constant of consuming Fe) = 1.8 / mg alum and for R2 constant we obtained 0.935, from these result we conclude our derived equation can represent the phenomenon of alum-Fe reduction phenomena in the field.

Karakter Ikatan Kimia, Kristalinitas, dan Ukuran Partikel Produk Silika yang Disintesis dari Bahan Limbah Padat Geotermal Joko Suryadi; Sabinna Azahra Sulaeman; Shafira Yulianthina; Tifa Paramitha; Eko Andrijanto
JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Vol 7, No 1 (2023)
Publisher : State University of Malang or Universitas Negeri Malang (UM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um0260v7i12023p010

Silika disamping dapat disintesis dari prekusornya, juga dapat diekstraksi melalui bahan-bahan alam salah satunya adalah dari limbah padat geothermal pada situs pembangkit listrik panas bumi. Pada penelitian ini, telah dilakukan sintesis senyawa silika dari bahan baku limbah padat geothermal dengan metode sol-gel. Tujuan dari penelitian ini adalah memperoleh senyawa silika dari limbah padat geothermal dengan variasi implementasi penambahan HCl dalam metode sol-gel yaitu dengan metode tetes dan metode alir. Produk silika yang terbentuk kemudian dikarakterisasi berdasarkan ikatan kimia, kristalinitas, dan ukuran partikelnya. Bahan HCl yang digunakan dalam penelitian ini divariasikan pada tingkat kemurnian pro analis (p.a) dan teknis. Produk silika yang didapatkan mempunyai yield 25,74% dan 9,93% untuk masing-masing metode tetes dan metode alir. Karakterisasi produk silika yang dihasilkan mencakup analisis FTIR untuk karakter ikatan senyawa, difraksi sinar X untuk karakter kristalinitas dan metode dynamic light scattering untuk menentukan ukuran partikel produk. Karakteristik ikatan kimia dari analisis serapan bilangan gelombang dengan FITR menunjukkan bahwa produk yang dihasilkan adalah silika. Senyawa yang didapatkan berjenis amorf bersasarkan kristalinistasnya dengan ukuran partikel terbesar pada 483,5 nm dengan penambahan HCl dengan metode alir dan 782,5 nm dengan metode tetes.

Pengaruh Temperatur Kalsinasi Terhadap Kapasitas Ion Katalis Asam Heterogen Berbasis Silika dan Aplikasinya pada Sintesis Metil Oleat: The Effect of Calcination Temperature on the Ion Capacity of Heterogeneous Silica-Based Acid Catalysts and Its Application in the Synthesis of Methyl Oleate Joko Suryadi; Nanda Nabila; Syafa Neiska Bayhaqi; Eko Andrijanto
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 2 (2023): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i2.16457

Sulfated silica catalyst is a solid acid catalyst which in its application is used to accelerate esterification reactions. The purpose of this study was to determine the effect of calcination temperature and increasing the amount of catalyst on the effectiveness of silica as a catalyst in the formation of methyl oleate through esterification reactions. The synthesis of sulfuric acid catalyst from rice husk ash went through several stages, including preparation of raw material for rice husk ash, production of silica using the sol-gel method, manufacture of silica-based acid catalysts and characterization of the sulfated silica catalyst. The acid catalyst was prepared using impregnation method with sulfuric acid and calcined at various temperatures of 500, 600, 700 and 800oC. The characterization of the acid catalyst formed includes ionic capacity, catalyst performance in the esterification reaction, and the determination of the bond characteristic functional groups using FTIR. The results of ion capacity analysis showed that the highest acidity value was found in the sulfated silica catalyst calcined at 600oC of 0.372 mmol/gram. Testing the performance of the catalyst in the esterification reaction with a ratio of 4:1 (methanol:oleic acid) obtained an ester conversion of 38.89% using a catalyst of 30% of the amount of oleic acid. Identification results using FTIR show that sulfate ions have chemically interacted with silica at around 1103.28 cm-1

Pengaruh Penambahan Sodium Lauryl Sulfat terhadap Karakteristik Sabun Padat pada Mata Kuliah Praktikum Analitik Proses Suryadi, Joko; Andrijanto, Eko
Jurnal Pengelolaan Laboratorium Pendidikan Vol.6, No.1, Januari 2024
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jplp.6.1.24-33

Solid soap as a result from process analysis practicum can be produced using with hot process method using raw material of palm oil and a strong base in the form of NaOH. The aim of this research is that apart from fostering student inquiry regarding the soap making process, they are also able to analyze the parameters of solid soap over a certain period based on variations in the amount of added surfactant. The methods used in practicum activities are dividing practicum groups, making solid soap, and collecting practicum reports. In the activity of making solid soap, the concentration of sodium lauryl sulfate (SLS) was varied for each group, 0, 1, 2 and 3% w/w respectively. The parameters measured in this research were the pH value, water content, ability to form foam, free fatty acid content and ethanol insoluble material in solid soap. The pH characterization of the results of the saponification process shows that soap at all variations in SLS concentration is predominantly alkaline. The characterization carried out showed that the levels of free fatty acids and ethanol insoluble substances met SNI 3532:2016 standards. Water content parameters do not meet these standards because the measurements were carried out during practical activities and without the process of holding the soap product. From the results of observing these parameters, in general it can be concluded that the solid soap products resulting from the practical work have the best quality under the condition of adding SLS with a concentration of 1%.

Efektivitas Katalis Heterogen Fly Ash (FA-SO3H) pada Sintesis Biodiesel dari Palm Fatty Acid Distillate Abdulloh, Sudrajat Harris; Andrijanto, Eko; Saripudin, Saripudin; Putri, Anindya Indrita; Nurul, Dhea; Elizabeth, Lidya
Fluida Vol 17 No 1 (2024): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v17i1.5286

The increase in fuel use along with the decline in production of petroleum exploration activities encourages efforts to find alternative fuels, one of which is biodiesel from PFAD (Palm Fatty Acid Distillate) with production reaching 6,000,000 tons while its utilization is still low. Biodiesel production from PFAD using Fly ash (FA)-SO3H catalyst which is a heterogeneous catalyst through esterification method. FA used in this study was wet impregnated using 6M sulfuric acid (H2SO4) for 24 hours, so that the highest acid concentration was obtained at a calcination temperature of 500 ⁰C of 1.1654 mmol/gram. The research was conducted with Response Surface Method (RSM) with Box Behnken Design model in Design Expert 13 software and 13 runs were obtained. The resulting model from RSM was obtained as optimum conditions at catalyst loading (%-w) 5-10, methanol:PFAD molar ratio (n/n) 10:1-30:1, reaction time 3-5 hours and temperature 60 ⁰C. Based on the experimental results and ANOVA, the high conversion is influenced by the high catalyst loading and methanol:PFAD ratio (n/n), with the conversion obtained of 72.89% at catalyst loading of 10%-w, methanol:PFAD molar ratio of 20 (n/n) and time for 5 hours.

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