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All Journal VALENSI JURNAL KIMIA SAINS DAN APLIKASI Teknotan: Jurnal Industri Teknologi Pertanian Jurnal Natur Indonesia Jurnal Sains Materi Indonesia Jurnal Penelitian Hasil Hutan Dharmakarya : Jurnal Aplikasi Ipteks Untuk Masyarakat The Journal of Pure and Applied Chemistry Research Journal of Mathematical and Fundamental Sciences Jurnal Keramik dan Gelas Indonesia Indonesian Journal of Science and Technology Al-Kimia Chimica et Natura Acta ALCHEMY Jurnal Penelitian Kimia Indonesian Mining Journal Indonesian Journal of Chemistry Jurnal Kartika Kimia Jambura Journal of Chemistry Molekul: Jurnal Ilmiah Kimia Indonesian Physical Review Jurnal Penyuluhan Perikanan dan Kelautan Al-Khidmat : Jurnal Ilmiah Pengabdian Kepada Masyarakat Jurnal Penelitian Hasil Hutan Jurnal Keramik dan Gelas Indonesia Asean Journal of Science and Engineering (AJSE) Jurnal Ilmiah Berkala Sains dan Terapan Kimia Makara Journal of Science Gunung Djati Conference Series Jurnal Kimia dan Rekayasa Jurnal Material dan Energi Indonesia Jurnal Teknologi Lingkungan Bulletin of Chemical Reaction Engineering & Catalysis al Kimiya : Jurnal Ilmu Kimia dan Terapan ETHOS: Jurnal Penelitian dan Pengabdian kepada Masyarakat Jurnal Penelitian Hasil Hutan
Atiek Rostika Noviyanti
Departemen Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Padjadjaran
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Yield and Characteristics of Biodiesel from Variations in the Mass Ratio of Waste Cooking Oil Mixtures with Different Waste Sources through Homogeneous Catalyzed Esterification and Transesterification Reactions: Rendemen dan Karakteristik Biodiesel dari Variasi Rasio Massa Campuran Limbah Minyak Goreng dengan Perbedaan Sumber Limbah Melalui Reaksi Esterifikasi dan Transesterifikasi Berkatalis Homogen Haryono; Noviyanti, Atiek Rostika; Kurnia, Irwan
Jurnal Teknologi Lingkungan Vol. 26 No. 2 (2025)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jtl.2025.8170

Abstract

Abstrak Bahan bakar fosil sebagai sumber dominan pemenuhan kebutuhan energi merupakan sumber energi tak terbarukan, sehingga cadangannya akan semakin berkurang seiring dengan peningkatan laju konsumsinya. Biodiesel memiliki potensi sebagai bahan bakar menjanjikan yang dapat menggantikan bahan bakar fosil. Biodiesel digunakan sebagai energi terbarukan dan berkelanjutan karena kandungan sulfur yang hampir tidak ada, netral karbon, dan tidak beracun bagi lingkungan. Biodiesel dapat dihasilkan dari asam lemak yang diperoleh dari beberapa bahan baku, seperti minyak nabati, lemak hewan, dan limbah minyak goreng. Namun demikian, pemanfaatan minyak non pangan sebagai bahan baku produksi biodiesel merupakan langkah strategis. Limbah minyak goreng (LMG) sebagai salah satu jenis minyak non pangan memiliki karakteristik bervariasi. Karakteristik dari limbah minyak goreng tersebut akan mempengaruhi kualitas dan jumlah produksi biodiesel. Tujuan penelitian ini adalah untuk menentukan pengaruh komposisi (rasio massa) campuran LMG dari sumber limbah berbeda (ayam goreng, AG; seafood, SF; dan gorengan, GR) sebagai bahan baku pada sintesis biodiesel dengan katalis asam sulfat dan kalium hidroksida. Penelitian diawali dengan pencampuran LMG dengan variasi komposisi LMG (LMG-AG:LMG-SF:LMG-GR) sebagai rasio massa R1(2:3:1), R2(2:2:2), R3(1:2:3), dan R4(3:1:2). Tahap berikutnya adalah pemurnian dan karakterisasi terhadap campuran LMG, esterifikasi dengan katalis asam sulfat, transesterifikasi dengan katalis kalium hidroksida, pemurnian biodiesel, dan karakterisasi biodiesel. Hasil penelitian menunjukkan bahwa Sintesis biodiesel dari campuran LMG dengan komposisi R3 menghasilkan biodiesel dengan rendemen tertinggi, yaitu 92,12%. Sedangan biodiesel dari campuran LMG dengan komposisi R1 memiliki karakteristik paling sesuai dengan standar kualitas biodiesel menurut Keputusan Dirjen EBTKE tahun 2022 berdasarkan parameter-parameter yang diuji.   Abstrak Fossil fuels, as the dominant source of meeting energy needs, are non-renewable energy sources, so their reserves will decrease as the rate of consumption increases. Biodiesel has the potential to be a promising  fuel that can replace fossil fuels. Biodiesel is a renewable and sustainable energy source because it contains almost no sulfur, is carbon neutral, and is non-toxic to the environment. Biodiesel can be produced from fatty acids from several raw materials, such as vegetable oil, animal fat, and waste cooking oil. However, using non-food oil as raw material for biodiesel production is a strategic step. Cooking oil waste, as a type of non-food oil, has varied characteristics. The characteristics of waste cooking oil will affect the quality and quantity of biodiesel production. The research aims to determine the effect of the composition (mass ratio) of WCO mixtures from different waste sources (fried chicken, AG; seafood, SF; and fried foods, GR) as raw materials on the synthesis of biodiesel with sulfuric acid and potassium hydroxide catalysts. The research began with mixing WCO with variations in WCO composition (WCO-AG:WCO-SF:WCO-GR) as mass ratios R1(2:3:1), R2(2:2:2), R3(1:2:3), and R4(3 :1:2). The next stage is purification and characterization of the WCO mixture, esterification with a sulfuric acid catalyst, transesterification with a potassium hydroxide catalyst, biodiesel purification, and biodiesel characterization. The research results showed that the synthesis of biodiesel from a mixture of WCO with R3 composition produced biodiesel with the highest yield, namely 92.12%. Meanwhile, biodiesel from the WCO mixture with composition R1 has the characteristics that best comply with biodiesel quality standards according to the Decree of the Director General of EBTKE in 2022, based on the parameters tested.
ASSESSING CISANTI LAKE SEDIMENTS AS ENVIRONMENTAL QUALITY INDICATORS IN THE UPSTREAM OF THE CITARUM RIVER Fitriani, Dini; Agustine, Eleonora; Hajar Kirana, Kartika; Meliani, Tiara Ayu; Rofifah, Sinthia Anis; Chicilia, Novia; Muhammad, Irfan Handi; Rostika Noviyanti, Atiek; Tamuntuan, Gerald Hendrik
Indonesian Physical Review Vol. 8 No. 3 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i3.490

Abstract

Environmental conditions in aquatic ecosystems could change due to the entry of additional materials, such as heavy metals and magnetic minerals. These materials, referred to as anthropogenic materials, could be derived from human activities. The presence of the materials could affect the magnetic properties and heavy metals content of river water and sediments. We have analyzed magnetic susceptibility and heavy metal concentration in sediments collected from Cisanti Lake. Cisanti Lake is known as “zero kilometers” of the Citarum River. Using the level of heavy metals in sediments, we calculated and evaluated pollution indices in the form of Contamination Factor (CF), Geoaccumulation Index (Igeo), and Pollution Load Index (PLI). The results showed that the magnetic susceptibility of sediments (𝜒𝐿𝐹) was in the range of 317.2 - 2274.9 (× 10-8) m3kg-1, inferring the dominance of ferrimagnetic minerals in sediments. Based on bivariate analysis of 𝜒𝐿𝐹 and the calculated frequency-dependent magnetic susceptibility or cFD (%), domain states of magnetic minerals are clustered at stable single domain (SSD)/multidomain (MD). Pollution indices of CF and Igeo showed that all sample points were contaminated by Cu at a considerable level.  Moderate to significant contamination occurred in the studied area according to the PLI analysis. The positive strong correlation between 𝜒𝐿𝐹 and PLI suggests that magnetic susceptibility serves as a proxy indicator of contamination. 
KARAKTERISTIK PRODUK DARI ESTERIFIKASI DENGAN BANTUAN GELOMBANG ULTRASONIK TERHADAP MINYAK BIJI KAPUK TEROZONASI Haryono; Engela Evy Ernawati; Atiek Rostika Noviyanti
Jurnal Penelitian Hasil Hutan Vol. 40 No. 3 (2022): Jurnal Penelitian Hasil Hutan
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2022.40.3.144-154

Abstract

The kapok seed oil is non-edible oil so it is very profitable as a raw material for making biodiesel. However, the kapok seedoil is dominated by long chain and unsaturated fatty acids. These types of fatty acids tend to reduce the quality of biodiesel, namelythe low cetane number and trigger polymerization reactions during combustion. Ozonation could be applied to shorten the carbonchain and the number of double bonds in fatty acids from kapok seed oil. This research aims to study the effect of time of ozonationat preparation stage of kapok seed oil on biodiesel characteristics of esterification stage with the assistance of ultrasonic waves. Theozonation time was varied for 60, 90, and 120 minutes. The results showed that the longer the time of ozonation the kapok seedoil produced with the increased acid number. The greater acid number of the kapok seed oil was verified by the fatty acid compositionof Gas Chromatography-Mass Spectroscopy analysis, showed that the fatty acid structure of the kapok seed oil became simpler.The esterification for 120 minutes to ozonated kapok seed oil which has been ozonized produces oil phase with an acid number of10.6 mg KOH/g, a saponification number of 112 mg KOH/g, and a density of 903 kg/m3.
KARAKTERISASI BIODIESEL DARI MINYAK KEMIRI SUNAN DENGAN KATALIS HETEROGEN SILIKA TERIMPREGNASI KALSIUM OKSIDA (CaO/SiO2 ) Haryono; Yati B. Yuliyati; Atiek Rostika Noviyanti; Mochammad Rizal; Sarifah Nurjanah
Jurnal Penelitian Hasil Hutan Vol. 38 No. 1 (2020): Jurnal Penelitian Hasil Hutan
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2020.38.1.10-20

Abstract

Commercial biodiesel of oil palm is controversial as the palm oil is classified as food oil and palm plantation utilizesfertile land. One potential type of vegetable oil as biodiesel raw material is kemiri sunan (Reutealis trisperma(Blanco) Airy Shaw) oil. This research aimed to prepare a heterogeneous solid catalyst in the form of an impregnatedSiO2by CaO catalyst (CaO/SiO2), to study the effect of the esterification stage on free fatty acid (FFA) content ofoil, and to test the activity of the CaO/SiO2catalyst during the trans-esterification stage for biodiesel formation. CaO/SiO2catalysts were prepared by sol-gel method made from natural materials (egg shells and rice husk). The FFAcontent of kemiri sunan oil was determined through various esterification stages namely 1; 1.5; and 2 hours in thepresence of H2SO4catalyst. While the trans-esterification stage was carried out under reaction temperature of 60°C,oil to methanol ratio of 1:9, reaction time of 2 hours and CaO/SiO2catalyst content of 3%. The results showed thatthe esterification stage for 1; 1.5; and 2 hours reduced the FFA content from 12.5% (without esterification) to 0.65%;0.58%; and 0.54% respectivaly. Biodiesel made from kemiri sunan oil which was synthesized with the addition ofCaO/SiO2catalyst at optimal conditions of trans-esterification stage fulfilled SNI 7182-2015: Biodiesel based ondensity, viscocity, moisture content, iodine number, and cetane number.
Effect of Preparation Acetone on Fish Bones Synthesized Through Sintering Method to Improve Hydroxyapatite Characteristics Kusumawardani, Ratna; Noviyanti, Atiek Rostika; Nurhadi, Mukhamad; Umar, Akrajas Ali
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol. 10 No. 2 (2023): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v10i2.29422

Abstract

In the development of advanced materials and various technological applications, the preparation and sintering processes have become two important factors in determining material characteristics. This research focuses on two main aspects, namely the effect of fish bone preparation by soaking in acetone and the surface area of the material in the sintering process as part of the process of developing better materials. This research aims to determine the effect of soaking fish bone powder with acetone and the effect of the surface area of sintered fish bones to produce hydroxyapatite (HA). The immersion process with acetone is included in the sample preparation stage, while the sintering process is included in the material synthesis stage. These two things can affect the characteristics of the HA produced after analysis from the X-ray diffraction test. The HA structure obtained from all samples is hexagonal with cell parameter values a = b ≠ c and space group P 63 / m, where all samples have a value range of a = b = 9,42 Å and c = 6,88 Å. HA crystallinity was identified through the XRD peak at 2θ = 25,8 (002); 31,7 (211); 32,1 (112); 32,8 (300); 34,0 (202); 39,7 (310); 46,6 (222); 49,4 (213); 50,4 (321). The PAF-900 and CAF-900 samples are similar to HA in JCPDS 01-089-4405 whose compound formula is Ca5(PO4)3(OH) while the PWAF-900 sample is similar to HA in JCPDS 01-075-3727 whose compound formula is Ca5(PO4)3(CO3)0.01(OH)1.3. The percentage of crystallinity of PAF-900, CAF-900, and PWAF-900 respectively was 84,767; 73,506; and 71,962% with HA grain sizes of 0,8964; 0,6808, and 0,7398 nm. The HA density of PAF-900 and CAF-900 samples is 3,149 g/cm3 while PWAF-900 is 3,146 g/cm3. Based on this description, it can be concluded that the soaking preparation stage with acetone produces HA with the chemical formula Ca5(PO4)3OH with a higher percentage of crystallization and is denser compared to HA obtained without going through the soaking preparation stage with acetone. The sintering stage also plays an important role in increasing the crystallization percentage. The surface area of the material being sintered also influences the percentage of crystallization and the grain size of the resulting HA. Sintered fish bone powder produces a greater percentage of crystallization and grain size than fish bone chunks
EVALUATION OF MINERAL-BASED HYDROXYAPATITE/ZnO COMPOSITES AS PHOTOCATALISTS FOR METHYLEN BLUE DEGRADATION Hardian, Arie; Nafisah, Aulia Zakiyatun; Karya, Teguh; Halim, Riyan; Murniati, Anceu; Syarif, Dani Gustaman; Noviyanti, Atiek Rostika; Nurhayati, Mita; Jasmansyah, Jasmansyah; Reza, Muhammad
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol. 11 No. 2 (2024): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v11i2.37886

Abstract

The use of dyes in the textile industry has increased significantly, raising concerns about their potential to pollute the environment and harm human health. Methylene blue is a widely used synthetic dye, necessitating effective methods for its degradation. Photodegradation is a promising approach to decompose dyes into simpler, less harmful compounds. In this study, hydroxyapatite combined with ZnO was employed as a photocatalyst material to enhance photocatalytic performance. The research aims to degrade methylene blue using a Hydroxyapatite/ZnO (HAp/ZnO) nanocomposite through photodegradation. The optimization of the photodegradation process was investigated by varying irradiation time, methylene blue concentration, and pH. The optimum degradation of methylene blue was achieved using 20 mg of HAp/ZnO nanocomposite at an irradiation time of 120 minutes, an initial methylene blue concentration of 5 ppm, and pH 7. Adsorption isotherm modeling revealed that the process followed the Langmuir isotherm model, with a maximum adsorption capacity (qmax) of 0.3353 mg/g. The degradation followed pseudo-second-order kinetics with a reaction rate constant of 4.0026×105 L/mol·s.
Photoluminescent Carbon Dots for Intelligent Food Packaging: A Review on Sensing Mechanisms and Applications Maqsudi, Shobir Muntahal; Mardawati, Efri; Noviyanti, Atiek Rostika; Hardian, Arie; Ma’Amor, Azman
Jurnal Kartika Kimia Vol 8 No 2 (2025): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v8i2.950

Abstract

Ensuring food safety and quality has become a global priority, demanding innovative solutions to detect early signs of spoilage or contamination. Intelligent food packaging systems offer a promising approach through real-time monitoring of food quality. Among various sensing materials, carbon dots have emerged as a novel class of fluorescent nanomaterials with exceptional optical properties, high water solubility, low toxicity, and tunable photoluminescence. This review discusses the synthesis strategies of CDs particularly focusing on green synthesis using biomass waste and their photoluminescence mechanisms including quantum confinement, surface state, carbon core state, and molecular state emissions. The application of CDs in smart packaging is highlighted, especially in detecting spoilage indicators such as ammonia, hydrogen sulfide, Total Volatile Basic Nitrogen, and pH changes. Various studies demonstrate the ability of CDs embedded in biopolymer matrices to produce distinct color changes in response to food spoilage, making them effective visual sensors. These findings support the development of eco-friendly, sensitive, and low-cost nano sensors for next-generation intelligent packaging technologies.
Mediated Electrochemical Oxidation with Lead as Electrode for Organic Waste Treatment from Pulp Industry: Oksidasi Elektrokimia Termediasi dengan Elektroda Timbal untuk Pengolahan Limbah Organik dari Industri Pulp Haryono; Juliandri; Rostika Noviyanti, Atiek; Kurnia, Irwan
Jurnal Kimia dan Rekayasa Vol. 6 No. 2 (2026): Jurnal Kimia dan Rekayasa Edisi Januari 2026
Publisher : Program Studi S1 Teknik Kimia, Fakultas Teknik, Universitas Setia Budi

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

Abstract

The pulp industry is a type of industry based on natural materials, namely lignocellulose, which produces relatively large amounts of organic liquid waste. The use of various types of synthetic chemicals in the pulp production process results in waste from this industry being classified as hazardous and toxic waste. Various methods of liquid waste treatment can be applied, one of which is the Mediated Electrochemical Oxidation (MEO) method. The MEO method allows organic compounds in liquid waste to be oxidized into simple and relatively environmentally friendly inorganic compounds, such as carbon dioxide and water. The purpose of this study was to determine the effect of the potential difference between electrodes and time on the performance of the MEO method with lead electrodes in the treatment of organic liquid waste from the pulp industry. The potential difference between electrodes was studied at values of 3.0, 4.5 and 6.0 volts, while the electrolysis time in MEO was studied for 60, 90 and 120 minutes. The performance of the MEO method in the treatment of organic liquid waste was determined based on the degradation efficiency parameters. The results showed that the maximum degradation efficiency of organic waste was achieved when MEO was carried out at a potential difference between electrodes and an electrolysis time of 6.0 volts and 120 minutes. Under these MEO operating conditions, an organic waste degradation efficiency of 99.03% was achieved. AbstrakIndustri pulp merupakan salah satu jenis industri berbasis bahan alam, yaitu lignoselulosa, yang menghasilkan limbah cair organik relatif banyak. Pemanfaatan berbagai jenis bahan kimia sintetik pada proses produksi pulp mengakibatkan limbah dari industri tersebut termasuk sebagai limbah berbahaya dan beracun. Berbagai metode pengolahan limbah cair dapat diterapkan, salah satunya adalah metode Oksidasi Elektrokimia Termediasi (OET). Metode OET memungkinkan senyawa organik pada limbah cair untuk dioksidasi menjadi senyawa anorganik sederhana dan relatif ramah lingkungan, seperti karbon dioksida dan air. Tujuan penelitian ini adalah menentukan pengaruh beda potensial antar elektroda dan waktu terhadap kinerja metode OET dengan elektroda timbal pada pengolahan limbah cair organik dari industri pulp. Beda potensial antar elektroda dipelajari pada nilai 3,0, 4,5 dan 6,0 volt, sedangkan waktu elektrolisis pada OET dipelajari selama 60, 90 dan 120 menit. Kinerja metode OET pada pengolahan limbah cair organik ditentukan berdasarkan parameter efisiensi degradasi. Hasil penelitian menunjukkan bahwa efisiensi degradasi limbah organik maksimum dicapai ketika OET dilakukan pada beda potensial antar elektroda dan waktu elektrolisis sebesar 6,0 volt dan 120 menit. Pada kondisi operasi OET tersebut dicapai efisiensi degradasi limbah organik sebesar 99,03%.
Pengaruh Konsentrasi Natrium Silikat terhadap Laju Korosi Paduan Aluminium dalam Lingkungan Natrium Klorida 3,5% Rukiah Rukiah; Diding Mandala Putra; Solihudin Solihudin; Yeni Wahyuni Hartati; Atiek Rostika Noviyanti
ALCHEMY Jurnal Penelitian Kimia Vol 16, No 2 (2020): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.16.2.40927.218-226

Abstract

Korosi merupakan proses penurunan kualitas logam akibat reaksi logam dengan lingkungannya. Air laut merupakan salah satu sistem yang korosif karena tingginya kadar ion klorida. Ion silikat dengan konsentrasi optimum mampu memperlambat laju korosi pada logam, seperti aluminium. Penelitian ini menguji pengaruh ion silikat dalam larutan natrium klorida 3,5% terhadap laju korosi aluminium yang diuji dengan metode potensiostat dan dihitung dengan Ekstrapolasi Tafel. Pengaruh konsentrasi ion silikat terhadap laju korosi diamati pada variasi konsentrasinya yaitu 0, 25, 50, 75, dan 100 mM. Konsentrasi optimum natrium silikat untuk menurunkan laju korosi adalah 25 mM,  laju korosi turun dari 0,0118 menjadi 0,0084 mm/tahun. Sebaliknya, penambahan konsentrasi natrium silikat hingga 100 mM,  dapat meningkatkan laju korosi menjadi 0,101 mm/tahun.The Effect of Sodium Silicate Concentration on the Corrosion Rate of Aluminum Alloy in Sodium Chloride 3.5%. Corrosion is a process of decreasing the quality of metals due to the reaction of metals with their environment. Seawater is one of the corrosive systems because of the high levels of chloride ions. Silicate ions with optimum concentrations can slow the rate of corrosion in metals, such as aluminum. This research examines the effect of silicate ions on the aluminum corrosion rate in a solution of sodium chloride 3.5%, tested by the potentiostat method and calculated by Tafel extrapolation. The effect of silicate ion concentration on the corrosion rate was observed in various concentrations of 0, 25, 50, 75, and 100 mM. The optimum concentration of sodium silicate in reducing the corrosion rate is 25 mM, in which the corrosion rate drops from 0.0118 to 0.0084 mm/year. Conversely, increasing the concentration of sodium silicate to 100 mM increased the corrosion rate to 0.101 mm/year.
Isolation of Silica-Lignin Composites from Rice Husk and Their Adsorption to Cr(VI) Yati B. Yuliyati; Seli Listiani; Solihudin Solihudin; Atiek Rostika Noviyanti
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 2 (2018): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.2.19818.267-276

Abstract

Rice husk is the most abundant agricultural waste in Indonesia. It can be used as a precursor for multifunctional materials such as silica-lignin composite for adsorbents. Silica-lignin can reduce heavy metal content in an industrial waste, such as the content of Cr(VI). This study aims to isolate and characterize silica-lignin composite, and determines the isotherm type of silica-lignin for hexavalent chromium adsorption. The isolation from rice husk used an alkali extraction method. Confirmation of typical functional groups in the silica-lignin composite was characterized by FTIR, while the morphology was characterized by SEM, respectively. The results reveal that the silica-lignin isolation was successfully performed.  FTIR spectra indicate a typical wavenumber of the silica-lignin.  The SEM image of the composite showed homogeneous morphology. The silica-lignin adsorption process on hexavalent chromium followed a Brunauer–Emmett–Teller (BET) isotherm type indicated by multilayer adsorption with a surface area of 948.8421 mg. g-1.
Co-Authors Adhitya Pratama Adzkia, Qurratu Aini Alya Akrajas Ali Umar Akrajas Ali Umar Akrajas Ali Umar Alfi Ikhlasul Amal Alfi Ikhlasul Amal Alfian Nur Firdaus Alfian Raymondo Sinurat Allyn Pramudya Sulaeman Amal, Alfi Ikhlasul Anceu Murniati Anni Anggraeni Anni Anggraeni, Anni Arie Hardian Arini Nurisydayanti Gumilar Asman Asman Asril Pramutadi Andi Mustari Ayu Wanda Marita Azhari Yusuf Azhari Yusuf Azman Bin Ma'Amor Azman Bin Ma'Amor Azmi Prasasti Bambang Prijamboedi Basril Simbarta Tarigan Budi Adiperdana Budiman, Yudha Prawira Cecep Kusmana Chicilia, Novia Claudia Agesti Dani Gustaman Syarif Dani Gustaman Syarif Dayu Kusuma, Hersandy Diana Rakhmawaty Diana Rakhmawaty Diana Rakhmawaty Eddy Dickry Abil Barry Pratama Diding Mandala Putra Dini Fitriani Dini Janati Diyanthi, Erlinda Widyasmara Dzikri T Qodir E Evy Ernawati E. Evy Ernawati Efri Mardawati Eko Prabowo Hadisantoso, Eko Prabowo Eleonora Agustine Engela Evy Ernawati Engela Evy Ernawati Fajar Firmansyah Ferli Septi Irwansyah Firmansyah, Fajar Gabrielle Callista Dwi Putri Gani Abdilah Geofanny S Hutabarat Gerald Tamuntuan Ghaissani Nur Maulani Gustaman Syarif, Dani Halim, Riyan Hanapratiwi, Reinanda HARYONO Haryono Haryono Haryono Haryono Hemzah, Sabila Aulia Hendri Setiawan Hersandy Dayu Kusuma I Nyoman Marsih Iman Rahayu Irwan Kurnia Irwan Kurnia Ismunandar Ismu Iwan Hastiawan Iwan Hastiawan Iwan Hastiawan Jasmansyah, Jasmansyah Juliandri Juliandri Juliandri Kartika Hajar Kirana Karya, Teguh Kurnia, Irwan Laelaturrohmah Laelaturrohmah Lestari, Putri Rizka Lubis, Rubianto A. Ma'Amor, Azman Bin Malik, Yoga Trianzar Maqsudi, Shobir Muntahal Maryani, Eneng Mastuti Widi Lestari Mastuti Widi Lestari, Mastuti Widi Ma’amor, Azman Meliani, Tiara Ayu Mochammad Rizal Mochammad Rizal Mohammad Rofik Usman Muhamad Rozaq Nur Fauzi Muhammad Raihan Gemilang Muhammad Reza Muhammad, Irfan Handi Mukhamad Nurhadi Mukhamad Nurhadi, Mukhamad Nafisah, Aulia Zakiyatun Nisrina, Aniqa Novella, Indrika Nur Akbar Nur Akbar Nur Azizah Ferdiana Nurhayati, Mita Pandu, Rinal Rahmadona, Nova Ratna Kusumawardani, Ratna Reinanda Hanapratiwi Rihan Amila Putri Rinal Pandu Risdiana Risdiana RISDIANA RISDIANA, RISDIANA Rizka Endah Roekmiati Tjokronegoro Roekmiati Tjokronegoro, Roekmiati Rofifah, Sinthia Anis Rubianto A. Lubis Rukiah Rukiah Rukiah Rukiah Rukiah Rukiah Rukiah Rukiah Rukiah Rukiah Rustaman Rustaman S SOLIHUDIN S Solihudin, S S. Suryana Sahrul Hidayat Sarifah Nurjanah Seli Listiani Shariffuddin Bin Md Zain Solihudin Solihudin Solihudin, Solihudin Solihudin, Solihudin Sovia Islamiah Suryana Suryana Syamsiyatul Fajriyah TATI NURHAYATI Titin Siti Fatimah Titin Siti Fatimah Wahyu Safriansyah Walim Lili Yashfi, Difa Muhammad Yati B Yuliyati YATI B YULIYATI Yati B Yuliyati Yati B Yuliyati Yati B Yuliyati, Yati B Yati B. Yuliyati Yati B. Yuliyati Yati B. Yuliyati Yeni Wahyuni Hartati Yoga Trianzar Malik Yudha Prawira Budiman Yuli Andriani YULIANDRI Yusi Deawati Yusi Deawati