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Karakterisasi Hasil Sintesis Fotokatalis TiO2 Dengan Metode Sol-Gel dan Hidrothermal Untuk Aplikasi Limbah Petroleum Manja Nanda Resa Manja; Hasmalina Nasution; Zumrotun Nasihah; Tengku Finalia; Laila Rahmadanis; Prasetya Prasetya; Rahmadini Syafri; Sri Hilma Siregar
Sistem Informasi Vol 12 No 2 (2022): Jurnal Photon
Publisher : LPPM Universitas Muhammadiyah Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jp.v12i2.3473

Petroleum waste (crude oil) has become one of the sources of pollution in the sea. The pollution caused comes from several factors, oil spills from tankers, deliberate disposal of irresponsible industries. The layer of crude oil on the surface of the air holds back gas exchange from the atmosphere and reduces the solubility of oxygen in the waters so that it interferes with the respiration and photosynthesis processes in phytoplankton which are food producers in the sea. This study aims to characterize the synthesized TiO2 photocatalyst material using two methods, namely Sol-Gel (SG) and Hydrothermal (HD) which will then be used for applications in petroleum waste. To determine effectiveness of TiO2 photocatalyst in reducing crude oil spills on the sea surface based on fatty oil parameter tests. The synthesis of TiO2 was carried out by the solgel method (SG) and the hydrothermal method (HD) at various temperatures of 300 oC, 500 oC, and 700 oC. Characterization of the material formed using the SEM-EDX instrument, showed that in general it is spherical in shape, and is composed of C, O and Ti elements. The maximum effectiveness of SG-300, SG-500, and SG-700 was able to reduce fat oil content by 57.19%, 66.14% and 41.42% while HD-300, HD-500, and HD-700 were able to reduce fatty oil content. maximum of 60.87%. , 56.41% and 45.68% in the 120 minute irradiation time. The results showed that the photodegradation process in petroleum waste treatment using TiO2 material was able to reduce the fat oil content.

Titanium Dioxide (TiO2) Modified Bentonite for Photodegradation in Methylene Blue Dye Sri Hilma Siregar; Prasetya Prasetya; Norramizawati Norramizawati; Marlian Marlian; Aulia Rizki Ramadhanti
Jurnal Kimia Sains dan Aplikasi Vol 26, No 4 (2023): Volume 26 Issue 4 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.4.143-150

Dye is one of the waste waters, which will be a problem if the content is excessive in the water. Modifying bentonite with titanium dioxide (TiO2) as a photocatalyst for removal of dye waste. In this study, composite synthesis was carried out by mixing bentonite and TiO2 suspensions. The mass of bentonite is 20 g, and the mass variations of TiO2 are 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%. The resulting composite was heated using a furnace at 550°C for 5 hours. Bentonite-TiO2 composites were characterized using Fourier Transform Infrared, X-Ray Diffraction, and Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX). Photodegradation of methylene blue dye with bentonite-TiO2 was carried out by varying the mass of bentonite-TiO2 photocatalysts (0.02, 0.04, 0.06, 0.08 g); variations in pH (1, 3, 5, 7, and 9), and variations in UV irradiation time (30, 60, 90, and 120 minutes). The results of characterization with FTIR showed the presence of Ti-O-Ti vibrations at wavenumber 1419 cm-1 and Si-O-Ti at wave numbers 780 cm-1 and 799 cm-1. Characterization of 20% bentonite-TiO2 by XRD showed rutile, anatase, and montmorillonite phases. The SEM-EDX bentonite-TiO2 characterization results produced some small particles with a layered structure with TiO2 particles clumping and still in the form of agglomerates, and the EDX results showed the chemical composition of Si and Ti. The results of photodegradation showed that the best activity for the bentonite-TiO2 composite occurred in photocatalyst BT-20% with a mass of 0.08 g, pH 1, and UV irradiation time of 120 minutes with methylene blue 99.942% degraded.

The Sintesis Dan Karakterisasi Karbon Aktif Dari Limbah Biomassa Reject Pulp Sebagai Adsorben Zat Warna: Reject pulp Sri Hilma Siregar; Hasmalina Nasution; Wirdati Irma; Dedi Suwito; Aulia Rizki Rahmadani; Sha-Ling Han
Acta Chimica Asiana Vol. 6 No. 2 (2023)
Publisher : The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v6i2.164

This study examines the design of a heat exchanger (HE) in the production process of nickel ferrite (NiFe2O4) nanoparticles using the coprecipitation method by determining the shell and tube heat exchanger. The Microsoft Excel application is used as a manual calculating machine to facilitate the analysis of heat exchanger (HE) data calculations. The research flowchart starts with a literature study, preparation of tools and materials for design, calculation of the main shell and tube components, and then fabrication. Based on the calculation results, the design specification data for a shell and tube heat exchanger has a shell diameter of 0.032 m, a shell length of 4.267 mm, a thickness of 0.002 m with an initial heat transfer rate (Q) of 460130 W resulting in a heat transfer efficiency of 95.706% and an NTU of 6.165. The high effectiveness value makes the design of the one shell and tube type turbulent flow heat exchanger (HE) considered to have met the standards of high effectiveness and good performance. The design and design process is complete if the device functions properly. This study can be used as a reference for researchers in designing heat exchangers during production to make them more effective, reliable, and economical.

PENANAMAN NILAI-NILAI TANGGUH LINGKUNGAN MASYARAKAT DESA MEKAR JAYA KECAMATAN KAMPAR KIRI TENGAH KABUPATEN KAMPAR Raihana Raihana; Sri Hilma Siregar; Ressy Agmallia; Hardian Dwi Saputra; Fildzah Rosyiqah; Yopie Yulanda; Yudhistira Adrian Prasetio; Siti Rahmawati; Teguh Juliano Fier; Nurazima Nurazima
SWARNA: Jurnal Pengabdian Kepada Masyarakat Vol. 2 No. 8 (2023): SWARNA: Jurnal Pengabdian Kepada Masyarakat, Agustus 2023
Publisher : LPPM Sekolah Tinggi Ilmu Ekonomi 45 Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/swarna.v2i8.807

Permasalahan lingkungan tidak lepas dari penanaman nilai-nilai peduli lingkungan, melestarikan lingkungan dengan dukungan penuh dalam diri masyarakat tempatan. Lingkungan merupakan suatu ruang yang dimanfaatkan untuk beraktivitas dan menjalani hidup yang mempengaruhi perkembangan kehidupan manusia. Ini lah yang melatar belakangi mahasiswa dalam pelaksanaan Kuliah Kerja Nyata (KKN) mengusung program kerja yang berbasis “Desa Tangguh Lingkungan”. Program ini didampingi oleh praktisi dan akademisi Universitas Muhammadiyah Riau. Metode pengabdian kepada masyarakat melalui program KKN dengan program yaitu: pembuatan tanaman obat keluarga (TOGA), penyemprotan disinfektan, sosialisasi cara mencuci tangan yang baik dan benar, bakti sosial, dan pembuatan bak sampah. Tujuan pengabdian kepada masyarakat yaitu: meningkatkan rasa peduli masyarakat desa terhadap lingkungan, merawat, menjaga dan pengembangan lingkungan bersih.

PENANAMAN NILAI-NILAI TANGGUH LINGKUNGAN MASYARAKAT DESA MEKAR JAYA KECAMATAN KAMPAR KIRI TENGAH KABUPATEN KAMPAR Raihana Raihana; Sri Hilma Siregar; Ressy Agmallia; Hardian Dwi Saputra; Fildzah Rosyiqah; Yopie Yulanda; Yudhistira Adrian Prasetio; Siti Rahmawati; Teguh Juliano Fier; Nurazima Nurazima
SWARNA: Jurnal Pengabdian Kepada Masyarakat Vol. 2 No. 8 (2023): SWARNA: Jurnal Pengabdian Kepada Masyarakat, Agustus 2023
Publisher : LPPM Sekolah Tinggi Ilmu Ekonomi 45 Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/swarna.v2i8.807

Permasalahan lingkungan tidak lepas dari penanaman nilai-nilai peduli lingkungan, melestarikan lingkungan dengan dukungan penuh dalam diri masyarakat tempatan. Lingkungan merupakan suatu ruang yang dimanfaatkan untuk beraktivitas dan menjalani hidup yang mempengaruhi perkembangan kehidupan manusia. Ini lah yang melatar belakangi mahasiswa dalam pelaksanaan Kuliah Kerja Nyata (KKN) mengusung program kerja yang berbasis “Desa Tangguh Lingkungan”. Program ini didampingi oleh praktisi dan akademisi Universitas Muhammadiyah Riau. Metode pengabdian kepada masyarakat melalui program KKN dengan program yaitu: pembuatan tanaman obat keluarga (TOGA), penyemprotan disinfektan, sosialisasi cara mencuci tangan yang baik dan benar, bakti sosial, dan pembuatan bak sampah. Tujuan pengabdian kepada masyarakat yaitu: meningkatkan rasa peduli masyarakat desa terhadap lingkungan, merawat, menjaga dan pengembangan lingkungan bersih.

Pelatihan Pembuatan Pupuk Kompos Limbah Kulit Nangka Bagi Masyarakat Desa Kualu Nenas- Kab. Kampar Rahmayani Indah Putri; Hasmalina Nasution; Rahmita Syafitri; Putri Khorely; Prasetya; Fitra Perdana; Rahmadini Syafri; Jufrizal Syahri; Rahmiwati Hilma; Sri Hilma Siregar
Jurnal Pengabdian UntukMu NegeRI Vol. 8 No. 1 (2024): Pengabdian Untuk Mu negeRI
Publisher : LPPM UMRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jpumri.v8i1.6255

limbah hasil produksi keripik nangka selama ini berdasarkan hasil survei tim ppk ormawa HIMAKI umumnya tidak dioptimalkan dengan baik oleh masyarakat desa, salah satunya ada di Desa Kualu Nenas. Oleh karena itu kegiatan ini dilakukan dengan tujuan untuk mensosialisasikan dan melatih keterampilan masyarakat desa bagaimana mengolah limbah kulit nangka dan menjadikannya salah satu produk UMKM Desa. Salah satu produk yang bisa dibuat dari limbah kulit nangka adalah pupuk kompos. Metode yang digunakan dalam penelitian ini yaitu dengan melakukan pelatihan dan bimbingan teknis pembuatan pupuk dari limbah kulit Nangka dan pemasaran produk yang dihasilkan di Desa Kualu Nenas. Hasil dari kegiatan ini adalah masyarakat dan mitra desa dapat memproduksi pupuk kompos dan produk dapat dikembangkan menjadi salah satu produk UMKM Desa Kualu Nenas.

EVALUASI PRAKTIKUM KIMIA UNTUK GURU SEKOLAH MENENGAH SE-RIAU: KAJIAN KEPUASAN DAN PENGUATAN KOMPETENSI PRAKTIS Meidita Kemala Sari; Hasmalina Nasution; Sri Hilma Siregar; Prasetya Prasetya; Jufrizal Syahri; Rahmiwati Hilma; Rahmadini Syafri; Desi Asda Mora; Putri Apriliani Khorely
Devote: Jurnal Pengabdian Masyarakat Global Vol. 5 No. 2 (2026): Devote : Jurnal Pengabdian Masyarakat Global, June 2026
Publisher : LPPM Institut Pendidikan Nusantara Global

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/devote.v5i2.6039

The Assisted School Program, launched by the Department of Chemistry at Universitas Muhammadiyah Riau (UMRI), aims to enhance the laboratory skills of high school chemistry teachers in Riau Province. The program addresses the need for stronger practical skills and a better understanding of laboratory safety, given limited access to modern equipment and current experimental methods in schools. Its primary goal is to provide teachers with technical and pedagogical competencies through project-based laboratory training in Laboratory Safety, Volumetric Analysis, Gravimetric Analysis, UV-Vis Spectrophotometry, and Adsorption.The program combined theoretical lectures, hands-on laboratory demonstrations, and pre- and post-test evaluations to measure knowledge gains. Twenty chemistry teachers from different schools in Riau participated. Results showed a significant improvement in post-test scores and high satisfaction levels. The overall service quality received an average rating of 4.95 out of 5, with the UV-Vis Spectrophotometry and Adsorption session achieving the highest satisfaction score of 4.80. No significant differences were found among schools, indicating the program’s equitable impact. These results demonstrate that the Assisted School Program effectively improves teachers’ professional competence, promotes safer, more modern laboratory practices, and provides a strong foundation for sustainable collaboration among universities, schools, and industry.

Synthesis of Bentonite-TiO2 Bionanocomposite for Photodegradation of Used Lubricating Oil Sri Hilma Siregar; Hasmalina Nasution; Rennadya Sekar Fitri; Aulia Rizki Ramadhanti
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.86

Used lubricating oil waste contains heavy metal components which, if they enter the water, will block light. Used lubricants include toxic and hazardous waste (B3) so they need further processing before being reused or thrown away, because they are dangerous for human health and the environment. This research aims to determine the ability or effectiveness of the Bentonite-TiO2 composite in degrading used lubricating oil. The research began by synthesizing Bentonite-TiO2 where the composite results obtained were characterized. Based on the results of the FTIR spectrum analysis of Bentonite-TiO2, Ti was successfully modified in bentonite because the wave number 1419.84 cm-1 shows the presence of Al-O groups and the wave number 1423.92 cm-1 shows the presence of Ti-O-Ti vibrations. The results of XRD characterization show that TiO2 has formed in the bentonite-TiO2 composite, this makes the bentonite-TiO2 more stable and can be used as photocatalysis in the processing of used lubricating oil. The results of SEM-EDX analysis of Bentonite-TiO2 show the chemical composition of C, O, Al, Si, Ca, and Ti. In photodegradation, the mass variation viscosity value with an optimum time of 5 hours is the highest viscosity value, namely with a viscosity value of 5.11 cSt.

Chitosan/Bentonite Composite Membrane Doped with LiOH as an Electrolyte Candidate for Energy Storage Systems Sri Hilma Siregar; Akmilna Aqlina Manurung; Meidita Kemala Sari; Hasmalina Nasution
Jurnal Kimia Sains dan Aplikasi Vol 29, No 6 (2026): Volume 29 Issue 6 Year 2026
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.29.6.423-432

This study aimed to synthesize and characterize chitosan/poly(vinyl alcohol) (PVA)-based polymer electrolyte membranes modified with bentonite and LiOH using the solvent casting method. The chitosan:PVA composition was varied from 10:90 to 90:10 to evaluate its effects on the physical, mechanical, thermal, morphological, and electrochemical properties of the membranes. Characterization was conducted through thickness, tensile strength, and porosity measurements, as well as Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy–Energy Dispersive X-ray Spectroscopy (SEM–EDX), Thermogravimetric Analysis–Derivative Thermogravimetry (TGA–DTG), and Cyclic Voltammetry (CV). The results showed that the membrane with a chitosan:PVA ratio of 10:90 exhibited the highest tensile strength of 19.86 MPa, whereas the membrane with a ratio of 30:70 achieved the highest porosity of 20.49%, which facilitated ion transport and enhanced electrochemical performance. FTIR analysis confirmed intermolecular interactions among chitosan, PVA, bentonite, and LiOH through the O–H, N–H, C=O, Si–O, and Li–O functional groups. SEM–EDX analysis revealed that carbon and oxygen were the predominant elements, while calcium, sodium, silicon, and lithium were also detected, consistent with the membrane composition. Cyclic voltammetry demonstrated typical capacitive behavior, with the current response increasing as the scan rate increased. Meanwhile, TGA–DTG analysis indicated gradual thermal degradation, with the primary decomposition occurring between 350°C and 550°C, demonstrating good thermal stability. Overall, the chitosan/PVA–bentonite composite membrane doped with LiOH shows strong potential as an environmentally friendly polymer electrolyte membrane for energy storage applications, particularly lithium-ion batteries.

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