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All Journal CHEMICA Jurnal Teknik Kimia Prosiding Semnastek Jurnal Deformasi Science and Technology Indonesia FROPIL (Forum Profesional Teknik Sipil) Jurnal Inovator Bearing : Jurnal Penelitian dan Kajian Teknik Sipil Jurnal Teknik Sipil Institut Teknologi Padang
Mira Setiawati
Universitas Muhammadiyah Palembang
Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Effect of Solution Concentration, Fly Ash Ratio, and Aging Time on the Quality of Nano-Silica Setiawati, Mira; Saggaff, Anis; Saloma; Ngian, Shek Poi
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.2.622-627

Abstract

Fly ash, a byproduct of coal combustion, has gained significant attention due to its high silica content, and this silica-rich waste can be effectively converted into nano-silica. Factors such as the molarity of the solution, liquid-to-solid ratio, and the aging time play an essential role in determining the characteristics of silica nano produced, including particle size, morphology, and purity. This research aimed to determine the optimal conditions of solution molarity and the liquid-to-solid ratio to produce high-purity nano silica, examine the effect of aging time on the morphology and size of silica nanoparticles, and evaluating the effectiveness of the sol-gel method in producing nano-silica. This research uses nitric acid (HNO3 3 M) as the solution because it has not been widely explored and is more effective than other acidic solutions. In addition, the liquid-to-solid ratio varied from 1:5, 1:10, and 1:15, and combined with an aging time of 9 and 12 days, this study became the focus. The sample tested included XRD, XRF, FTIR, and SEM to confirm the nano-silica characteristics. It shows XRD is in the range of 2θ of about 20-22◦, which indicates the presence of amorphous silica, and FTIR shows results that support XRD data. SiO2 composition ranges from 97.47% to 98.57%, a very high amount of pure silica. It may concluded that silica nanoparticles have a particle size that varies from 151.2 nm to 295.4 nm, with a smooth morphology and relatively well distributed.
Analisis Perbandingan RAB dengan Metode SNI 2008 dan AHSP 2022, Studi Kasus : Proyek Ruko di Jl. KR. Rojali, Desa Merah Mata, Lr Belitung, Prajen, Banyuasin I, Banyuasin – Sumatera Selatan Ridho, M. Effrian; Rachman, Delli Noviarti; Setiawati, Mira
Bearing : Jurnal Penelitian dan Kajian Teknik Sipil Vol 10, No 1 (2025): Bearing : Jurnal Penelitian dan Kajian Teknik Sipil
Publisher : Universitas Muhammadiyah Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32502/jbearing.v10i1.9923

Abstract

Before the construction project begins, a financing method is needed to estimate the value of the project. This study uses two RAB methods, namely the SNI 2008 method and the AHSP 2022 method. This study uses the construction of a shophouse on Jl. KR. Rojali, Merah Mata Village, Lr. Belitung, Prajen Banyuasin I, Banyuasin – South Sumatra. The calculation results concluded that using the SNI 2008 method yielded a project construction value of IDR 758,355,000, while the cost estimate using the AHSP 2022 method was IDR 681,878,000. The difference in estimated values between the SNI 2008 method and the AHSP 2022 method shows that the SNI 2008 method is 10% more expensive than the AHSP 2022 method.
Variasi Molaritas Naoh Dan Alkali Aktivator Beton Geopolimer Mira Setiawati; Sri Martini; Rully Nurulita
Jurnal Deformasi Vol. 7 No. 1 (2022): JURNAL DEFORMASI
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/deformasi.v7i1.7983

Abstract

Cement as a building material for concrete produces CO2 which can damage the earth's atmosphere. Therefore, environmentally friendly geopolymer concrete is the choice. The main ingredients for making this concrete are pozzolanic materials which are rich in Silica (SiO3) and Alumina (Al2O3) as a substitute for cement and alkali activator in the form of Sodium Hydroxide (NaOH) and (Na2SiO3) as binders.This study aims to determine the variation of the mixture for the highest compressive strength. The ratio of fly ash type F and alkali activator is 74%:26%. The molarity of NaOH used was 10M, 12M, 14M, the ratio of Na2SiO3 and NaOH was 2.5:1; 3.0:1; 3.5:1. The test object is cylindrical size 15cm x 30cm and the compressive strength test is 28 days old.The test results with the ratio of NaOH and Na2SiO3 2.5:1 at 10M, 12M, 14M NaOH are 25.81 Mpa, 27.00 MPa, 28.98 MPa. While the compressive characteristics are 24.32 Mpa, 24.67 Mpa, 26.58 Mpa. The test results show that the ratio of molarity and alkali activator greatly affects the compressive strength and workability of geopolymer concrete. High molarity will produce high compressive strength. Meanwhile, the higher the alkali activator ratio, the lower the compressive strength produced. 
Pengolahan Limbah Cair Industri Menggunakan Metode Advanced Oxidation Processes: Analisis Perbandingan Kinerja Sri Martini; Mira Setiawati
Jurnal INOVATOR Vol. 9 No. 1 (2026): Jurnal INOVATOR
Publisher : LPPM Politeknik Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37338/68813942

Abstract

Limbah cair industri pengolahan minyak bumi memiliki karakteristik kompleks akibat keberadaan senyawa organik kompleks yang sulit terdegradasi secara alami. Penelitian ini mengkaji kinerja beberapa proses oksidasi tingkat tinggi atau advanced oxidation processes (AOPs), termasuk Fenton, photo-Fenton, TiO₂, dan TiO₂/ radiasi UV sinar matahari, dalam menurunkan konsentrasi TOC dengan mengevaluasi pengaruh radiasi cahaya, kondisi pH, dan variasi dosis oksidator/katalis. Hasil penelitian menunjukkan bahwa radiasi UV dari cahaya matahari mampu meningkatkan efisiensi oksidasi melalui peningkatan pembentukan radikal hidroksil (•OH). Proses photo-Fenton menunjukkan kemampuan degradasi tertinggi karena adanya kombinasi reaksi Fenton dan mekanisme fotokimia yang meningkatkan regenerasi Fe²⁺ serta mempertahankan aktivitas katalitik. Pengaruh pH menunjukkan kondisi optimum yang berbeda untuk setiap sistem, dimana pH 4 dan pH 5 untuk Fenton dan photo-Fenton, serta pH 5 dan pH 7 untuk TiO₂ dan TiO₂/UV. Selain itu, pada dosis reagen/katalis sebesar 1,5 mg/L, didapatkan persentase efisiensi penurunan TOC yaitu masing-masing sebesar 60,57%, 80%, 55,14%, dan 68% untuk Fenton, photo-Fenton, TiO₂, dan TiO₂/UV. Namun, pertambahan dosis yang berlebih mengakibatkan perlambatan reaksi aksidasi, bahkan terjadi penurunan efisiensi. Secara keseluruhan, AOPs terutama photo-Fenton merupakan teknologi efektif untuk pengolahan limbah cair industri.
Co-Authors Abdul Majid Agusri, Erny Ahmad Hidayat Alatif, M Rifki Anis Saggaff Arivai, Masri Bahri, Zainul Erliza Yuniarti Hambaly Febriyanto, Miko Imaduddin, M. Kateni, Darul Martini, RA Sri Masri A Rivai Maya Putriana Sari Melani, Septa Muhammad Imaduddin Nasution, Ali Napiah Nauvaliyanto, Fathur Ngian, Shek Poi noviarti, delli Oemiati, nurnilam Rahmayanti, Nadia Revisdah Revisdah, Revisdah Ridho, M. Effrian Royan, Noto Rully Nurulita Saloma Sri Martini Sri Martini, RA Wijaya, a Pasha