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S Suprihatin
Chemical Enggineering Department, Faculty Of Engineering, Universitas Pembangunan Nasional “Veteran” Surabaya, East Java, Indonesia
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PEMANFAATAN LIMBAH NASI AKING PADA PEMBUATAN BIOPLASTIK DENGAN KITOSAN DAN PLASTICIZER SORBITOL Halim, Muhammad Dani; Karangan, Adam; Suprihatin, Suprihatin; Nandini, Atika
Jurnal Teknik Kimia Vol 17, No 2 (2023): Jurnal Teknik Kimia
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v17i2.3792

Abstract

Bioplastik merupakan salah satu jenis plastik yang dapat terdegradasi oleh aktivitas mikroorganisme di lingkungan. Nasi aking mengandung kadar pati yang tinggi yaitu 70,68% dan berpotensi digunakan sebagai sumber bahan utama pembuatan bioplastik. Penelitian ini bertujuan untuk memperoleh kondisi optimal penambahan kitosan dan sorbitol serta mengetahui pengaruhnya terhadap kualitas produksi bioplastik. Pembuatan bioplastik ini dilakukan menggunakan metode solution casting dengan komposisi tepung nasi aking sebanyak 6 gr yang ditambahkan dengan kitosan dan sorbitol sesuai variasi. Pada penelitian ini, variasi penambahan sorbitol berpengaruh pada persen elongasi. Sedangkan variasi penambahan kitosan berpengaruh pada kuat tarik. Berdasarkan hasil uji, penambahan kitosan 10 gram dan sorbitol 5ml menghasilkan bioplastik dengan kualitas sebagai berikut: nilai kuat tarik sebesar 5,716 Mpa, nilai elongasi sebesar 22,10%, dan persentase biodegradasi sebesar 32,91% dalam waktu 45 hari. Hasil yang diperoleh telah memenuhi SNI No.7188.7 untuk nilai elongasi dan terdegradasi sempurna dalam waktu 45 hari sesuai dengan ASTM 5338. DOI : https://doi.org/10.33005/jurnal_tekkim.v17i2.3792
Sintesis Reduced Graphene Oxide dari Limbah Biomassa Serabut Kelapa Sawit dengan Metode Microwave Dona Avrilia Kristanti; Muhammad Hilmi Marzuqi; Ima Putriana; Suprihatin Suprihatin; Nur Aini Fauziyah
Jurnal Fisika Unand Vol 13 No 3 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.3.392-398.2024

Abstract

Pada penelitian ini membahas tentang pembuatan Reduced Graphene Oxide (rGO) dengan memanfaatkan limbah serabut kelapa sawit dari Aceh. Serabut kelapa sawit termasuk biomassa lignoselulosa berupa serat yang memiliki komponen utama selulosa 59,6%, lignin 28,5%, protein kasar 3,6%, lemak 1,9%, abu 5,6% dan impurities 8%. Metode yang digunakan dalam preparasi rGO adalah metode microwave. Sampel yang telah mendapat perlakuan microwave kemudian dikarakterisasi menggunakan XRD dan SEM untuk mengetahui fasa amorf dan morfologi dari sampel. Pada analisis XRD diperoleh hasil bahwa reduce graphene oxide memiliki fase amorf yang lebih dominan. Kemudian, pada analisis SEM diperoleh hasil bahwa GO dan rGO memiliki perbedaan morfologi pada permukaan sampel, dimana rGO memiliki bentuk lembaran yang lebih tipis daripada GO. Pada penelitian ini dapat diambil kesimpulan bahwa sintesis rGO yang telah dilakukan menggunakan serabut kelapa sawit dengan metode microwave belum sepenuhnya berhasil, dimana masih terdapat kandungan Graphene Oxide (GO) yang tidak tereduksi sempurna menjadi Reduced Graphene Oxide (rGO).
Pengaruh pH dan CTAB (Cetyl Trimethyl Ammonium Bromida) terhadap Morfologi Silika Mohammad Iqbal; Krisna Kumara Dewa; Meiska Dyah; Suprihatin Suprihatin; Nur Aini Fauziyah
Jurnal Fisika Unand Vol 13 No 3 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.3.433-438.2024

Abstract

Pada penelitian ini membahas terkait pengaruh penambahan pH dan CTAB (Cetyl Trimethyl Ammonium Bromida) terhadap morfologi silika dari abu vulkanik. Abu vulkanik memiliki kandungan silika yang cukup tinggi. Metode yang digunakan dalam pembuatan silika adalah kopresipitasi. Kemudian, silika dilakukan analisis XRD, SEM, dan FIIR untuk mengetahui fase, morfologi pada sampel, dan gugus fungsi. Pada analisis XRD diperoleh hasil bahwa silika memiliki fase amorf yang lebih dominan. Dikarenakan material awal yang digunakan merupakan abu vulkanik yang berbentuk amorf sehingga silika (SiO2) yang dihasilkan juga akan berbentuk amorf. Pada analisis SEM terhadap silika (SiO2) menunjukkan morfologi permukaan pada sampel, dimana silika (SiO2) memiliki bentuk mesoporous. Hasil dari penelitian ini mendapatkan ukuran partikel terkecil yaitu 27,3174 nm sedangkan yang terbesar yaitu 103,5214 nm. pH dan Cetyl Trimethyl Ammonium Bromida (CTAB) berpengaruh terhadap struktur kristal dan ukuran partikel silika yang didapatkan. Sedangkan pada analisis FTIR ditandai dengan adanya gugus fungsi  Si – O – Si dengan rentang panjang gelombang 1000 – 1115 cm-1 .
PENURUNAN KADAR BOD, COD, DAN TSS DALAM LIMBAH CAIR TAHU DENGAN METODE AERASI DAN OZONASI Adinda Putri Cahyani; Dwi Ayu Febrianti; Suprihatin Suprihatin
JURNAL INTEGRASI PROSES Vol 13, No 2 (2024)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jip.v13i2.28788

Abstract

Limbah cair industri tahu biasanya belum diolah secara optimal, sehingga mengandung kadar bahan pencemar yang tinggi. Berdasarkan hasil analisa diketahui limbah cair tahu di daerah Candi, Sidoarjo memiliki kadar COD sebesar 7704mg/L, BOD 4726mg/L, dan TSS 94mg/L. Limbah dengan bahan pencemar yang tinggi tidak dapat dibuang secara langsung ke lingkungan sehingga membutuhkan suatu pengolahan. Metode pengolahan yang dapat digunakan untuk mengurangi kadar pencemar yaitu metode aerasi dan ozonasi. Proses pengolahan limbah dengan metode aerasi dan ozonasi yaitu limbah cair tahu dilakukan proses pengenceran sebanyak 10 kali, kemudian dilakukan proses aerasi selama 6 jam dengan laju alir 6 L/menit. Hasil dari proses aerasi akan dilakukan penyesuaian pH dengan menambahkan larutan NaOH 1 M dengan variasi pH 6; 7; 8; 9; dan 10, setelah itu dilakukan proses ozonasi dengan laju alir ozon 400 mg/jam dan waktu kontak selama 60; 80; 100; 120; 140 menit. Hasil analisa BOD, COD, dan TSS pada limbah cair tahu yang telah dilakukan proses aerasi dan ozonasi menunjukkan hasil penurunan kadar tertinggi yaitu pada pH 10 dengan waktu kontak selama 140 menit yang menghasilkan kadar COD 662mg/L, BOD 241mg/L dan TSS 36mg/L.
Bio-briquettes Derived from Rice Husks and Mushroom Cultivation Materials Ika Nawang Puspitawati; Sani; Suprihatin; Mutasim Billah; Caecillia P udjiastuti; AR Yelvia
Nusantara Science and Technology Proceedings 4th International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2023.3608

Abstract

The bio briquette is a type of briquette that is derived from agricultural waste since it is intentionally produced using biomass charcoal. The processing of agricultural waste, such as mushroom planting material, into bio briquettes is characterized by its low cost. When bio briquettes undergo appropriate and accurate processing, they can yield briquettes of superior quality. The primary objective of this research endeavor was to generate a biobriquette using an agricultural byproduct derived from mushroom farming, while concurrently assessing the distinct attributes and properties of said biobriquette. The research utilized a total of 400 grams of waste from mushroom culture materials, together with an adhesive composed of 40 grams of starch. The briquette dough is subsequently extruded in a cylindrical shape. Subsequently, the mold briquettes are subjected to a heating process at a temperature of 80°C for 5 hours, to decrease the moisture content. The outcome of the smoke test indicates that the emission of smoke will cease after 75 seconds. In the conducted Combustion of Speed Test, the obtained findings indicate a combustion rate of 0.425 grams per minute, using an initial sample weight of 5.8 grams. The ash content yielded a reading of 10.6%.
Study of Crystallization Process of Potassium Chloride (KCl) Solution with Ethanol Solution Selvia Sofi Yanti; Muhimatur Rosida; Ketut Sumada; Caecilia Pujiastuti; Suprihatin Suprihatin
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5628

Abstract

This study develops a method for producing KCl fertilizer from KCl waste generated during the industrial production of calcium oxide, with KCl concentrations in the wastewater ranging from 7-10%. The main objective of this research was to investigate the effect of ethanol concentration and crystallization time on pore diameter, KCl content, and the amount of product produced. The study was conducted in two stages: evaporation and crystallization. In the evaporation stage, the KCl waste was heated until it reached a saturated solution. In the crystallization stage, ethanol solution was added as an antisolvent to accelerate the crystallization process.KCl analysis results showed that increasing ethanol concentration and crystallization time led to higher K and Cl content in the final product. The highest K content was 79.55%, and the highest Cl content was 16.88%, achieved with 90% ethanol concentration and a crystallization time of 100 minutes. BET analysis indicated that as ethanol concentration increased, the resulting product size grew larger, leading to smaller pore diameters. At high ethanol concentrations, the KCl crystals formed lacked pores. SEM-EDX analysis revealed that the KCl crystals not only contained K and Cl but also other elements such as C, O, and Ca.
Synthesis of Avocado Seeds Into Biodiesel Using A Catalyst CaO From Blood Cockle Shell Suprihatin; Alif Julian; Muhammad Fikri
Advance Sustainable Science Engineering and Technology Vol. 6 No. 4 (2024): August-October
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v6i4.779

Abstract

Biodiesel is an environmentally friendly fuel made from oil vegetables that contain triglycerides. Biodiesel from avocado seed vegetable oil in Indonesian agricultural areas which according to BPS 2022 data, Indonesia produces 183,000 tons of avocados per year. This research aims to gained the effect of adding reaction temperature and Oil : Methanol ratio influence on biodiesel production. The avocado seed oil obtained by soxhlet extraction method, where 50 gram avocado seeds powder extracted with n-hexane solvent in 1 hour extraction time and 60℃ temperature giving result 10% yield of avocado seed oil . The CaO catalyst are obtained from Calcination procees of blood cockle shells in 900℃ temperature and 4 hours calcination time giving 98.82% CaO Cotent. The biodiesel is produces with 97% methanol reactant and 98.82% CaO catalyst in various methanol volume (30; 40; 50; 60; and 70 ml) and under different temperature conditions (30; 40, 50, 60, and 70 ℃). The best result of transesterification process biodiesel is obtained in 50℃ and 40ml methanol gets biodiesel yield of 96%, methyl ester content of 99.83%,  density of 865 gr/cm3, viscosity of 2.5 cSt  , mgKOH/gr acid number of 0.56 of, and heating value of 9871.6 kcal/kg. Based on the high result of methyl ester content and heating value of biodiesel obtained from the procees, the avocado seed oil biodiesel potentially used as an sustainable energy.
PENGEMBANGAN BIODEGRADABLE FILM BERBASIS CAMPURAN PATI BIJI NANGKA DAN ALPUKAT DENGAN PENAMBAHAN PLASTICIZER SORBITOL Ramjani, Muhammad Rifki; Labib, Ahmad Nauval; Siswati, Nana Dyah; Suprihatin, Suprihatin
JURNAL INTEGRASI PROSES Vol 14, No 1 (2025)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jip.v14i1.31952

Abstract

Biji nangka dan alpukat dianggap sebagai limbah, padahal biji tersebut mengandung kadar karbohidrat dan pati yang tinggi, yaitu sekitar 56 gram per 100 gram biji nangka dan sekitar 80% dari kadar biji alpukat. Kedua biji ini dapat digunakan sebagai jaringan pembentuk polimer dalam pembuatan biodegradable film. Penelitian ini bertujuan untuk mendapatkan biodegradable film terbaik yang meliputi parameter kuat tarik, persen elongasi, ketebalan, dan persen biodegradasi yang mengacu pada Standar Nasional Indonesia (SNI) dan Japanese Industrial Standards (JIS). Penelitian ini menggunakan rasio massa pati biji nangka dan biji alpukat sebesar 10:0, 7:3, 5:5, 3:7, dan 0:10 gram, dengan penambahan sorbitol sebesar 10, 11, 12, 13, dan 14 mL. Proses diawali dengan penepungan biji nangka dan alpukat, lalu dilanjutkan dengan pembuatan larutan biofilm yang kemudian dicetak dan dikeringkan. Hasil biofilm dianalisis menggunakan metode ASTM D638. Kondisi terbaik berdasarkan parameter kuat tarik, nilai elongasi, ketebalan, dan biodegradasi terdapat pada rasio pati biji nangka dan alpukat 10:0 gram dan penambahan sorbitol 14 mL yang menghasilkan nilai kuat tarik sebesar 36,45 MPa, persen elongasi sebesar 88,1%, ketebalan 0,15 mm, dan persen biodegradasi 86%.
Study of Hydroxyapatite from White Mussel Shells Using Nitric Acid Solvent with the Sol-Gel Method Alia Febrianti Muliina; Nana Roudlotul Fitri; Suprihatin Suprihatin
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7436

Abstract

Mussel shells contain high calcium levels, making them suitable for hydroxyapatite (HAp) synthesis. HAp is a bioceramic widely applied in bone implant materials. This study synthesized HAp from white mussel shells (Corbula faba Hinds) using nitric acid via the sol-gel method. The effects of pH (8–12) and stirring temperature (30°C–90°C) on product yield and crystallinity were evaluated. X-ray fluorescence (XRF) was used to analyze elemental composition, while X-ray diffraction (XRD) characterized the crystalline phase. Results showed that increasing pH and temperature generally enhanced both yield and crystallinity. Optimal conditions were observed at pH 10 and higher temperatures, demonstrating the effective conversion of mussel shells into hydroxyapatite. These findings support the potential of marine biowaste as a sustainable raw material for biomedical applications.
Processing of Rice Husk into Bleaching Earth Using the Precipitation Method for Adsorption of Colorants in Palm Oil Fidela Lathifa Haryati; Puspa Prima Andini; Nurul Widji Triana; Susilowati Susilowati; Suprihatin Suprihatin
G-Tech: Jurnal Teknologi Terapan Vol 9 No 4 (2025): G-Tech, Vol. 9 No. 4 October 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i4.8024

Abstract

Rice husk waste from rice milling in Indonesia contains high silica, making it a promising raw material for adsorbent synthesis. This research contributes to sustainable waste utilization and supports green technology in palm oil refining, providing both environmental and industrial significance. This study focuses on producing Bleaching Earth from rice husk using the precipitation method and applying it to adsorb colorants in used cooking oil. Rice husk ash (RHA) was reacted with sodium hydroxide (NaOH) to form sodium silicate, which was then precipitated using sodium aluminate (NaAlO₂) and hydrochloric acid (HCl) to obtain silica gel. The process variables were the volume of NaAlO₂ solution (15–35 mL) and stirring time (10–50 minutes). The synthesized Bleaching Earth was analyzed for moisture content, pH, chemical composition (XRF), and surface properties (BET). The best Bleaching Earth met the Indonesian National Standard (SNI 136336-2000), with a moisture content of 2.48–6.01%, neutral pH (~7), and mesoporous structure with pore diameters of 6,49–13.87 nm. The optimal adsorption performance occurred at a pore diameter of 11–12 nm, achieved using 25 mL NaAlO₂ with 50 minutes of stirring or 35 mL NaAlO₂ with 40 minutes of stirring. Application of this BE effectively reduced the color intensity of used cooking oil, producing lighter and clearer oil, confirming rice husk’s potential as an eco-friendly, low-cost source for Bleaching Earth production.
Co-Authors Adinda Putri Cahyani Adji, Nafisa Tera Lintang Alia Febrianti Muliina Alif Julian AR Yelvia Bambang Wahyudi Wahyudi Caecilia Pujiastuti Caecillia P udjiastuti Dona Avrilia Kristanti Dwi Ayu Febrianti Erwan Adi Saputro Fidela Lathifa Haryati Halim, Muhammad Dani Ika Nawang Puspitawati Ima Putriana Karangan, Adam Ketut Sumada Kindriari Nurma Wahyusi Krisna Kumara Dewa L Edahwati Labib, Ahmad Nauval Lucytasari, Silvia Dyah Meiska Dyah Meutia Familya Mohamad Nabhan Putra Redian Mohammad Iqbal Mr. Sutiyono Muhammad Fikri Muhammad Hilmi Marzuqi Muhimatur Rosida Muliawan, Alvin Rizky Mutasim Billah Nana Roudlotul Fitri Nandini , Atika Novel Karaman Nur Aini Fauziyah Nur Aini Fauziyah Nurul Widji Triana Puspa Prima Andini Putri Sinta Dewi Sinaga Ramjani, Muhammad Rifki Retno Dewati Sani Selvia Sofi Yanti Septiyafani, Ayu Silviana Ariana Sintha Soraya Santi Siswati, Nana Dyah Sri Muljani SRIE MULJANI Suprianti, Lilik Susilowati Susilowati Trianna, Nurul Widji