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All Journal Reaktor Jurnal Teknik Kimia Jurnal Fisika Unand Journal of Natural Sciences and Mathematics Research CHEESA: Chemical Engineering Research Articles International Journal of Economics, Business and Accounting Research (IJEBAR) ASEAN Journal of Community Engagement G-Tech : Jurnal Teknologi Terapan Nusantara Science and Technology Proceedings International Journal of Eco-Innovation in Science and Engineering (IJEISE) Jurnal Pengbdian Teknik Mesin Serambi Engineering JURNAL REKAYASA KIMIA & LINGKUNGAN
SRIE MULJANI
Universitas Pembangunan Nasional Veteran Jawa Timur
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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TEKNOLOGI HEMAT ENERGI UNTUK PRODUKSI MULJANI, SRIE
Jurnal Teknik Kimia Vol 2, No 2 (2008): JURNAL TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v2i2.90

Abstract

The aim of this study is to calculate energy consumption at ectractive distillation process with saltsand solvent mixture as entrainer to produce fuel grade alcohol (>99.8%w). This process used twocolumn, the main exctractive column and the recovery column. A substantial reduction in the energyconsumption, compared with conventional process, was predicted by using ethylene glycol and salts isNaCl, K2CO3 and CaCl2  2CO3 : 0.05 g/ml or CaCl2  Key words : fuel grade alcohol, extractive distillation, solvent mixture0.75 g/ml or NaCl : 0.13 g/ml, at reflux ratio 1.5.as entrainer. Solvent and feed volum ratio (S/F) are varied in the range 0.3 – 1.4 , concentration salts in solvent are varied in the range 0.03 – 0.55 g salt / ml solvent and refluxratio 0.5 – 2.5. The results show that high S/F ratios increase the energy consumption, temperature ofthe solvent has important effect on distillate composition and energy consumption, this effect dependson the reflux ratio. Effect of salts show that when salts concentration increases, distillate compositionand energy consumption also increase. For distillate composition > 99.8%w, the lower energyconsumption Q = 821 KJ/kg and number of stage 36 (35% lower than conventional process) reachedin S/F ratio 0.9, K
SINTESIS MEMBRAN KITOSAN SILIKA DARI GEOTHERMAL SLUDGE Muljani, Srie; Kusuma, Kurnia Arifiani; Nofitasari, Luluk; Amalia, Ayu Rizka; Hapsari, Nur
Jurnal Teknik Kimia Vol 13, No 1 (2018): JURNAL TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v13i1.1150

Abstract

Untuk memperkuat membran diperlukan modifikasi agar karakteristiknya menjadi lebih baik diantaranya kestabilan dan memperkecil pori membran sehingga pemisahan molekul lebih efektif. Dalam penelitian ini, pembuatan membran kitosan dimodifikasi dengan penambahan silika amorf dengan sumber silika didapat dari Geothermal Sludge menggunakan bahan pendukung yaitu kitosan. Kandungan silika pada geothermal sludge sebesar 97,3% , silika diambil dengan cara ekstraksi dengan NaOH 2 N. Perbandingan kitosan-silika yaitu 1:0,5 sampai 1,5:1 dilarutkan dalam variasi pengenceran larutan natrium silika 1:2 sampai 1:6. Membran kitosan-silika  kemudian dikarakterisasi gugus fungsi (uji FTIR), morfologi membran (uji SEM) , uji permeabilitas membran dan uji permselektivitas membran (fluks). Uji swelling didapatkan semakin sedikit penambahan silika, maka konsentrasi kitosan akan lebih tinggi dalam membran sehingga hasil persen swelling semakin kecil , sedangkan hasil uji fluks terbesar adalah membran kitosan-silika 1:1,5 dengan perbandingan pengenceran larutan natirum silika 1:6. Hasil spektra FTIR menunjukkan adanya gugus fungsi baru setelah penambahan silka yaitu Si-OH , Si-O-Si, Si-O-C tekukan -CH dan -NH2. Penambahan silika menyebabkan membran kitosan yang rapat menjadi berongga karena muatan negatif dari kitosan yaitu OH- bereaksi dengan silika sehingga akan menarik dan membentuk rongga-rongga kecil. Membran kitosan-silika cocok digunakan pada proses filtrasi karena mempunyai pori.DOI : https://doi.org/10.33005/tekkim.v13i1.1150
PUPUK MULTINUTRIENT BERBASIS SILIKA DARI LIMBAH GEOTHERMAL SLUDGE DENGAN PROSES ASIDIFIKASI Wahyudi, Bambang; Muljani, Srie
Jurnal Teknik Kimia Vol 14, No 1 (2019): JURNAL TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v14i1.1651

Abstract

Sintesis pupuk multinutrien berbasis silika telah berhasil dilakukan. Pupuk multinutrien adalah pupukyang megandung lebih dari satu nutrient yang dihutuhkan tanaman seperti kalium, nitrogen dan fosfor.Pembuatan gel Si-K-N dan Si-K-Pdilakukan dengan pengasaman larutan kalium silikat menggunakan asamnitrat dan asam fosfat pada rentang pH 5,6,7,8 dan 9. Ekstraksi silika dari geothermal sludge dilakukanmenggunakan laruran kalium hidroksida (KOH) untuk mendapatkan larutan kalium silikat (K2SiO3). Hasilpeneltian menunjukkan bahwa produk yang sesuai dengan standar pupuk adalah pupuk K-Si-N pada pH 5dengan konsentrasi 33,4% K dan Si 18,01. %. Elemen N tidak sesuai dengan standar karena konsentrasi hanya6,55%. K-Si-P Pupuk yang memenuhi standar pada pH 5 dengan konsentrasi K 27,5% dan Si 13,61%. ElemenP tidak sesuai dengan standar yaitu 20,41%. Spektra IR menunjukkan bahwa produk pupuk mengandungkelompok silanol (Si-OH), siloxane (Si-O-Si), kelompok senyawa nitrogen, dan senyawa fosfat.Kata kunci : asidifikasi; fertilizer; geothermal sludge; multinutrien, silika DOI : https://doi.org/10.33005/jurnal_tekkim.v14i1.1651
SYNTHESIS OF CELLULOSE AEROGEL FROM KAPOK FIBER FOR CLEANING THE WASTE OF LUBRICANT OIL Susilowati, Titi; Muljani, Srie
Jurnal Teknik Kimia Vol 15, No 1 (2020): JURNAL TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v15i1.2305

Abstract

Cellulose aerogel is known to be superior in removal of oil pollutants and organic solvent. This research developed the synthesis of cellulose aerogel from kapok fiber, application as an adsorbent for lubricating oil waste and its reusability. Chemical delignification was carried out by immersing the kapok fibers in NaOH 6% solution at 100oC for 1h to obtained a cellulose of 65.5% (SNI-2009). The effect of urea concentration on adsorbent products was studied in the range of 8-16w%. Whereas the effect of cellulose was studied at a concentration range of 0.5-1.5w%. The gelation stage was carried out by adding cellulose in a NaOH/urea solution accompanied by stirring (1000rpm) for 15minutes. The mixture was cooled at 0 oC for 48h to form a gel.  The formed gel is dried by the freeze drying method at -45°C. The cellulose aerogel from kapok fiber with a density of 0.11g/cm3 and porosity of 92.46% had an absorption capacity of up to 11.987g/g in the first cycle. The use of each aerogel cellulose sample to absorb lubricant oil waste reached a maximum of three cycles.  DOI : https://doi.org/10.33005/jurnal_tekkim.v15i1.2305
Synthesis of Matrix Si-K-HAs Gel from Geothermal Sludge and Peat Srie Muljani; Bambang Wahyudi Wahyudi; S Suprihatin; Ketut Sumada
Reaktor Volume 18 No. 2 June 2018
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4869.103 KB) | DOI: 10.14710/reaktor.18.2.76-83

Abstract

The synthesis of matrix silica-potassium-humic acid gel (Si-K-HAs) has been performed successfully by gradual extraction and acidification method. The extraction was carried out in two stages: 1) extraction of humic substances from peat prepared by potassium hydroxide to produce potassium humate (K-HAS) solution, 2) extraction silica from geothermal sludge using K-HAs solution to produce Si-K-HAs solution. Acidification of Si-K-HAs solution prepared by citric acid (1-3N) to produce matrix gel of Si-K-HAs. The Si-K-HAs matrix gel products are characterized by Fourier Transform InfraRed (FTIR), X-ray fluroscence (XRF), and Brunauer–Emmett–Teller (BET) analysis. The acidification process was carried out in neutral to acid (pH 3-7) conditions and the results showed that at neutral pH no Si-K-HAs gel formed. IR spectra confirmed the presence of humic acid in the gel product, whereas XRF analysis confirmed the presence of potassium (K) and silica (SiO2) in the gel product. The molar ratio of SiO2:K2O in the product is 0.9 - 0.3 in the pH range of 3-5. Si-K-HAs powder can be used as soil fertilizer especially for soils that lack silica, humic, and potassium nutrients or for future application development. Keywords: gradual extraction; geothermal sludge; matrix gel; humic substance
Transformation of Calcium Carbonate Polymorph From Various Type of Shells by Carbonation Methods Srie Muljani; Erwan Adi Saputra; Ketut Sumada
Reaktor Volume 21 No. 1 March 2021
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1446.366 KB) | DOI: 10.14710/reaktor.21.1.27-34

Abstract

The utilization of shells can reduce the accumulation of shell wastes and increase the value of shells to achieve ecological and economic incentives. This study examines the transformation of calcium carbonate polymorph from several types of shells to understand the causes of their characteristics in order to suitable for their use. The types of shells used in this experiment are selected based on consumable and their habitats such as snail shells, crab shells, eggshells, batik mussels shells, and golden conch shells. The prepared shells calcinate at 900 °C, the reaction with hydrochloric acid, and carbonation by flowing CO2 into a stirred reactor to produce precipitated CaCO3. The characteristics of polymorph CaCO3  in the sintering temperature of 30, 50, and 70 ℃ were identified by XRD, FTIR, and SEM morphological. The result is that the polymorphs formed from each shell are different in shape, size, and crystallinity. At the temperature of 70 ℃, the rhombohedral calcite was obtained from snail shells, the cubic calcite was obtained from batik mussel shell, while rhombohedral calcite multilayers obtained (100%) from golden conch shells. The aragonite was obtained from batik mussel shells at 30 and 70 ℃. The pure vaterite (100%) was obtained from snail shells and crab shells at 50 ℃. The characteristic of polymorph formed might be useful as information for more suitable applications, especially as nano-bio materials, optical, or filler
Shrimp cracker industrial wastewater treatment with aerobic biological properties utilizing modified Contact-Stabilization method Sintha Soraya Santi; Kindriari Nurma Wahyusi; Ketut Sumada; Srie Muljani
Journal of Natural Sciences and Mathematics Research Vol 7, No 2 (2021): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jnsmr.2021.7.2.11284

Abstract

The prawn cracker industry is one of the most common types of food industry in Indonesia. The existence of this industry has a positive impact in maintaining and improving the Indonesian economy, but it can also have a negative impact on the environment in particular, because this industry produces wastewater which can have a negative impact on the aquatic environment if the wastewater is directly discharged into the river. Based on the results of the analysis of the quality of wastewater from one of the shrimp cracker industries, it is known that wastewater contains Chemical Oxygen Demand (COD) which is 3446 mg/L, Biological Oxygen Demand (BOD) 1118.9 mg/L and acidity (pH) 5.88 – 6.13. Referring to the wastewater quality standards for the shrimp cracker industry, namely COD: 120 mg/L, BOD: 50 mg/L, and acidity pH: 6-9, the shrimp cracker industrial wastewater must be treated first before being channeled into the body. river receiving water. In this study, the treatment process used is an aerobic biological process with a modified contact-stabilization method. This method is the development of the contact-stabilization method, where in this modified method the wastewater from the treatment is recycled to the stabilization tank and together with the bacteria is transferred to the contact tank. Variations carried out in this study are the incoming wastewater flow rate (liters/hour): 4,5 ; 5.5; 6.5 ; 7.5 and 8.5 and flow rate of recycled water from treatment to stabilization tank (%) : 10 ; 20 ; 30 of the incoming wastewater flow rate. The best results were obtained at the wastewater flow rate of 5.5 liters/hour and the recycled water flow rate from the treatment to the stabilization tank 20% with a decrease in the COD value of 97.3% and BOD of 98.4% and the pH of the treated water 6.9.©2021 JNSMR UIN Walisongo. All rights reserved.
Synthesis and Characteristics of Calcium Phosphate from White Mussel Shell Srie Muljani; Ketut Sumada; Nove Kartika
Nusantara Science and Technology Proceedings 4th International Seminar of Research Month
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2019.0473

Abstract

Biomaterials are materials that have been developed for repair, recovery of function, and replacement of diseased or damaged parts of the body especially in cases of fractures. The material for biomaterial that is commonly used is calcium phosphate (Ca3(PO4)2). The purpose of this research is to synthesize calcium phosphate and study its characteristics. The source of calcium carbonate in this study was from white mussel shells. The experiment was carried out by reacting calcium carbonate (CaCO3) and phosphoric acid (H3PO4) to form the liquid phase of calcium phosphate. The calcium phosphate solution was filtered and the filtrate obtained was added with a solution of NaOH as a pH controller, stirred using a magnetic stirrer in the time range from 10 to 50 minutes to form a calcium phosphate crystal. Filtration is carried out to separate the calcium phosphate crystals from the solution. The results showed calcium phosphate products containing 62% of ?-dicalcium phosphate (?-Ca2P2O7) and 38% of hydroxyapatite (Ca10(PO4)6(OH)2) so that it could be stated that the product was biphasic calcium phosphate. The raw material of white mussel shell powder was analyzed using X-Ray Fluorescence (XRF), while the calcium phosphate solution was analyzed by Spectrophotometry, Gravimetry, and AAS (calcium test). Hydroxyapatite products were analyzed by XRF, XRD (X-Ray Diffraction), FTIR (Fourier Transform InfraRed), and SEM (Scanning Electron Microscopy).
THE IMPACT OF ENVIRONMENT AND BEHAVIOR OF DAILY CATTLE BREEDERS ON CONSIDERATION OF INVESTORS IN INVESTING IN GALENGDOWO VILLAGE, JOMBANG J.E. Sutanto; Farida Pulansari; Srie Muljani; Sukirmayadi Sukirmayadi
International Journal of Economics, Business and Accounting Research (IJEBAR) Vol 6, No 3 (2022): IJEBAR
Publisher : LPPM ITB AAS INDONESIA (d.h STIE AAS Surakarta)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29040/ijebar.v6i3.5837

Abstract

The purpose of the study was to determine and analyze whether cow dung, environmental permits, and farmer behavior affect investors in investing in Galengdowo village. Design/Methodology/approach, the population in this study were all dairy farmers who had more than 5 dairy cows, while the number of samples used was 73 respondents. Data collection in this study was carried out by distributing research instruments using a Likert scale instrument and after the data was collected, data processing was carried out using the SPSS version 25 program. towards investors; (2) the environmental permit variable partially has a significant effect on investors, and (3) the breeder's behavior variable partially has a significant effect on investors. Based on the multiple linear regression equation, it can be explained as follows: First, the cow dung waste variable (X1) has the highest influence. Second, the farmer behavior variable (X3) has the lowest effect compared to the cow dung waste variable (X1) and the environmental permit variable (X2).
Synthesis and Modification of Nano-Precipitated Calcium Carbonate (PCC) with Addition of Ethylene Glycol Sani; Mega Rosilina; Mochamad Titus Maulana; A. R Yelvia Sunarti; Srie Muljani; Dwi Hery Astuti; Isni Utami
International Journal of Eco-Innovation in Science and Engineering Vol. 3 No. 01 (2022): IJEISE
Publisher : Engineering Faculty, University of Pembangunan Nasional Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v3i01.57

Abstract

ZA fertilizer waste (Ammonium sulfate) is waste generated from the industrial process of producing ZA fertilizer. The waste contains very high calcium and has the potential to be used as a raw material in the manufacture of Precipitated Calcium Carbonate (PCC). PCC with certain qualities can be developed in the field of advanced materials, with size modification into nanoparticles. One method to produce nanoparticles is using the coprecipitation method, with the help of a polymer solution. This study aims to produce Nano-PCC by finding the best conditions of CaCl2: Ethylene Glycol mole ratio and stirring speed. Nano-PCC is synthesized by reacting fertilizer waste with HCl to form a CaCl2 solution. Then, the solution is mixed with ethylene glycol to prevent particle agglomeration so that the size obtained will be smaller. The mixture is then reacted with Na2CO3 to form precipitated calcium carbonate (PCC). In this study, the variables were the mole ratio of CaCl2: ethylene glycol (1:12, 1:14, 1:18, 1:20) and stirring speed (350, 500, 650, 800, and 950 rpm). Based on PSA analysis, the Nano-PCC obtained at the smallest CaCl2: ethylene glycol ratio 1:12, stirring speed 950 rpm was 51.83 nm. Based on Scherrer’s calculations with XRD, the particle size obtained was 48.25 nm. SEM analysis showed that the crystals formed were dominated by vaterite crystals, with a size range of 55.71-607.79 nm.
Co-Authors A. R Yelvia Sunarti Abdullah, Affan Zein Amalia, Ayu Rizka Anggoro, Achmad Rahditya Viman Arianti, Rahma Dea Rerindra Astuti, Dwi Hery Bambang Wahyudi Bambang Wahyudi Wahyudi Caecilia - Pujiastuti Damayanti, Savira Farizqy Darma, Apriandi Putra Erwan Adi Saputro Farida Pulansari Hidayah, Wahyu ISNI UTAMI J.E. Sutanto JE Sutanto Ketut Sumada Caecillia Pujiastuti Kindriari Nurma Wahyusi Kusuma, Kurnia Arifiani L.Urip Widodo, Yohandrik Novel Karaman Luluk Edahwati Maulana, Mochamad Titus Mega Rosilina Mochamad Titus Maulana Nana Dyah Siswati, Anwar Zain and Mohammad Nicander, Priscillia stevanies Nofitasari, Luluk Nove Kartika Nugraha, Reva Edra Nur Hapsari Pangestu, Titan Obby Pradana, Alfian Rizki Prasetyo Hadi Prasetyo, Muhammad Dewa Pujiastuti, Caecilia Pujiastuti, Caecilia - Putri, Alisyah Ananda Rifaldi, Kornelius Rosilina, Mega S Suprihatin Sani Sani SANI SANI Santi, Sintha Soraya Sari, Amilia Putri Puspita Sintha Soraya Santi Sukirmayadi Sukirmayadi Sunarti, A.R Yelvia Suprihatin sutiyono sutiyono Titi Susilowati Wiraya, Wira Arta