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All Journal Jurnal Rekayasa Proses Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Eksergi: Chemical Engineering Journal Elkawnie Journal of Energy, Mechanical, Material and Manufacturing Engineering Communications in Science and Technology Jurnal Rekayasa Proses Risenologi Jurnal Abdidas Pelita Masyarakat Jurnal Pengabdian kepada Masyarakat Nusantara Unri Conference Series: Community Engagement Journal of Applied Materials and Technology Journal of Rural and Urban Community Empowerment Journal of Bioprocess Chemical and Environmental Engineering Science Journal of Community Engagement Research for Sustainability JURNAL KIMIA SAINTEK DAN PENDIDIKAN Seminar Nasional Produk Terapan Unggulan Vokasi Estungkara: Jurnal Pengabdian Pendidikan Sejarah Nanggroe: Journal Of Scholarly Service Jurnal Pengabdian Masyarakat Bangsa Nanggroe: Journal of Scholarly Service BATOBO: Jurnal Pengabdian Kepada Masyarakat Inspirasi: Jurnal Pengabdian Masyarakat Jurnal Rekayasa Proses Journal of Engineering and Technological Sciences Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Desi Heltina
Universitas Riau
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Facile and Environmentally Friendly Synthesis of Low-defect Few-Layers Graphene (FLG) Using Combined Shear Exfoliation Methods Amri, Amun; Wulandari, Revika; Fabryza, Dhina; Sunarno, Sunarno; Heltina, Desi; Bahri, Syaiful; Sarma, Deki; Miran, Hussein A.; Rahman, M. Mahbubur; Altarawneh, Mohammednoor; Jiang, Zhong Tao
Journal of Engineering and Technological Sciences Vol. 57 No. 5 (2025): Vol. 57 No. 5 (2025): October
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.5.4

Abstract

This study presents an environmentally friendly and scalable method for synthesizing high-quality few-layer graphene (FLG) through a combination of turbulence-assisted shear exfoliation (TASE) and high shear exfoliation (HSE) techniques. By systematically varying the high-shear mixer (HSM) speed (3000–5000 rpm) and processing time (1–3 hours), we precisely controlled key material attributes, including the number of graphene layers, crystallinity, lateral size, and defect density. Optimal conditions (5000 rpm, 3 hours) resulted in FLG with ~2–3 layers, confirmed by a symmetric 2D peak with a full-width at half-maximum (FWHM) of ~35 cm⁻¹ and a high I2D/IG ratio (~0.6), indicating excellent structural integrity. The ID/IG ratio (~0.1) further verified the presence of minimal defects, predominantly edge vacancies rather than oxidative disruptions. Raman imaging revealed a dominance of zigzag edge chirality, while TEM and PSA analyses demonstrated control over lateral size (~396.5 nm) and particle uniformity. The application of household dishwashing liquid as a green surfactant innovatively enabled selective and pure exfoliation. This work highlights how precise modulation of shear parameters can directly influence graphene quality, paving the way for sustainable large-scale production of low-defect FLG.
Performance Test of Methylene Blue Degradation Using TiO₂–Graphene Oxide Composite Synthesised from Coconut Shells Heltina, Desi; Fesya Putri, Andini; Fauziyah, Hidayatul; Peratenta Sembiring, Maria; Amri, Amun; Tao Jiang, Zhong
Rekayasa Vol. 23 No. 1 (2025)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v23i1.32529

Abstract

Industry produces textile liquid waste which contains dangerous compounds such as methylene blue which can damage the environment. One effective method to overcome this problem is to use a TiO2 nanocomposite-based photocatalyst modified with Graphene Oxide (GO). GO is obtained from the synthesis of coconut shells, which is a biomass waste. This research aims to synthesize and display the performance of a TiO2/Graphene Oxide composite photocatalyst from coconut shells in degrading methylene blue. The TiO2/Graphene oxide nanocomposite synthesis method begins by carbonizing coconut shells to form graphite. Carbonization removes volatile compounds and produces a rich carbon structure, which is the initial requirement for the formation of GO. Synthesis of GO from graphite using the Hummer method. Synthesis of TiO2/Graphene oxide composite using a solvothermal process with various GO mass ratios. The performance of the photocatalyst was tested for degradation using methylene blue. Analysis of the TiO2/Graphene Oxide Composite using XRD, FTIR, SEM, BET characterisation and UV-Vis Spectrophotometer. The results show that at GO of 15%, the composite showed the highest surface area and optimal anatase crystallinity, resulting in the best degradation efficiency (70%). Graphene Oxide is synthesized from coconut shell biomass waste. This research shows that the TiO₂–Graphene Oxide composite has high efficiency in degrading dangerous synthetic dyes from textile industry wastewater through an efficient photocatalytic mechanism. This composite application is an application of technology that contributes directly to achieving the Sustainable Development Goals (SDGs), especially SDG 6 (Clean Water and Adequate Sanitation), through the development of sustainable, efficient and environmentally friendly waste processing technology.
Produksi Pupuk Vermikompos Plus Berbasis Limbah Baglog Jamur Tiram Dalam Meningkatkan Usaha Kewirausahaan Mahasiswa Agroteknologi FAPERTA Universitas Riau dini, isna; Hapsoh; Yoseva, Sri; Lubis, Nursiani; Septya, Fanny; Heltina, Desi
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 4 No. 4 (2023): Jurnal Pengabdian kepada Masyarakat Nusantara (JPkMN)
Publisher : Lembaga Dongan Dosen

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

Abstract

Salah satu pemanfaatan limbah baglog jamur tiram yaitu dengan memanfaatkannya sebagai media dalam pengembangan cacing dan selanjutnya menghasilkan vermikompos. Produksi vermikompos ini dilakukan sebagai upaya pemanfaatan limbah yang dihasilkan dari usaha budidaya jamur tiram yang dilakukan oleh Fakultas Pertanian Universitas Riau. Tujuan pengabdian ini yaitu untuk produksi pupuk vermikompos berbasis limbah baglog jamur tiram untuk pengembangan salah satu usaha produk intelektual kampus (UPIK) di Fakultas Pertanian Universitas Riau. Vermikompos ini memiliki kelebihan karena diperkaya dengan jamur Trichoderma sp. sehingga diharapkan dapat meningkatkan nilai jual vermikompos dan manfaatnya bagi tanaman. Hasil kegiatan pengabdian yang telah dilakukan yaitu dibangunnya rak budidaya cacing sebanyak tiga tingkatan dengan total panjang semua rak lebih kurang 30 m dengan lebar 80 cm pada pada salah satu rumah kasa di Fakultas Pertanian berukuran 3 x 3 m. Hasil inkubasi cacing pada limbah baglog telah diproduksi sebanyak 50 kg vermikompos dengan harga jual Rp 7.500,-/kg. Total pendapatan penjualan vermikompos plus Trichoderma sp. sudah mencapai Rp 375.000,-. Usaha vermikmpos ini jika terus dilakukan diharapkan dapat menjadi revenue generating bagi Univeristas Riau dalam pengembangan usaha produk intelektual kampus dibidang pertanian.
Difusi Produk Intermediate Baru Very Few Layers Graphene (VFLG) dan Produk Turunannya oleh Inkubator Bisnis Graphene Guard Amri, Amun; Yenti, Silvia Reni; Heltina, Desi; Herman, Syamsu; Aziz, Azridjal; Nadhifah, Evi; Ekwarso, Hendro
Journal of Community Engagement Research for Sustainability Vol. 2 No. 5 (2022): September
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/cers.2.5.217-226

Abstract

Product diffusion of very few layers of graphene (VFLG) and its derivative (car/motorcycle polish) has been carried out by the Graphene Guard business incubator. The steps and strategies began with discussions in a discussion group forum (FGD) inviting experts in order to find the best marketing patterns. In this case the Canvas method was chosen as a marketing strategy. As a follow-up to the results of the FGD, several activities were carried out. Improvements to the system and production capacity were carried out by adding production equipment, innovating production systems and creating production automation systems. The next step was to design brand and logo activities as well as product labels. The design and manufacture of online and offline sales systems were carried out to follow up on increasing production capacity. To increase the effectiveness of marketing, promotional activities were carried out in the form of advertising, creating brochures, production videos and participating in exhibitions. The results obtained indicated that the marketing of the new intermediate product, very few layer graphene (VFLG) and its derivative products in the form of car polishes, was still experiencing diffusion problems, as evidenced by the low sales capacity. This was realized because this product was a new product and was not yet known to the public. Especially for VFLG products, the additional obstacle was that this product was an intermediate product, thus only certain groups of people need it. Evaluation steps are needed for continuous improvement in order to continue to strengthen the diffusion of this product in society.
Pemanfaatan Ekstrak Daun Ketapang (Terminalia catappa L.) sebagai Antibakteri untuk Produksi Sabun Cair Nurfatihayati, Nurfatihayati; Heltina, Desi; Putra, Eden; Delef, Fahrul Fajar; Alfarisi, Cory Dian; Drastinawati, Drastinawati
Eksergi Vol 21 No 1 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i1.10148

Abstract

Ekstrak daun ketapang (Terminalia catappa L.) mengandung senyawa kimia antibakteri yang dapat dimanfaatkan dalam memproduksi sabun cair. Tujuan penelitian ini memperoleh sabun cair dan menentukan variasi terbaik ekstrak ketapang untuk sabun cair yang memenuhi mutu sabun cair SNI 4085-2017. Penelitian ini bersifat eksperimental yang terdiri dari ekstrak daun ketapang dengan konsentrasi 0%, 2%, 4%, dan 6% serta KOH 25%, 30% dan 35%. Pembuatan ekstrak daun ketapang dilakukan dengan cara maserasi. Proses pembuatan sabun menggunakan metode hot process. Pengujian sabun cair meliputi uji pH, asam lemak bebas, angka lempeng total, stabilitas busa, menghitung perolehan sabun cair, dan menentukan variasi terbaik ekstrak ketapang pada sabun cair. Hasil penelitian ini menunjukkan perolehan sabun cair terbesar terdapat pada konsentrasi KOH 30% dengan konsentrasi ekstrak 4%, yaitu 157,35 gram dan rendemen 52,45%. Variasi ekstrak daun ketapang terbaik diperoleh pada konsentrasi 4% pada konsentrasi KOH 25% dengan karakteristik sabun cair, yaitu pH 9,19, asam lemak bebas 1,74%, angka lempeng total 0 x 101 koloni/ml, stabilitas busa 96,26%, dan zona hambat 11 mm. Sabun cair dengan variasi ekstrak daun ketapang yang dihasilkan telah memenuhi standar SNI 4085:2017.
Fabrication and Photocatalytic Performance of ZnO-Biochar Composites for Eliminating Dye Waste Heltina, Desi; Yoselino, Danil; Nabellia; Dumaria, Agustina; Amila, Khairati; Komalasari; Sembiring, Maria Peratenta; Amri, Amun; Jiang, Zhong Tao
Communications in Science and Technology Vol 10 No 2 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.2.2025.1795

Abstract

The synthesis of the ZnO-biochar composite from palm kernel shell biomass waste has been accomplished through the utilization of thesolvothermal method, yielding a satisfactory outcome. The resulting composite, a combination of ZnO and biochar, has been utilized in the degradation of methylene blue waste compounds. The objective of this research is to synthesize ZnO-biochar composites from palm shells, and to determine the optimal solvothermal temperature and duration. This research was initiated with the preparation of palm shells into biochar. Subsequently, the ZnO-biochar composite was synthesized with variable solvothermal temperatures and solvothermal times. The ZnO-biochar composite was characterized using analytical techniques including SEM-EDX, FT-IR, XRD, BET and UV-vis DRS. The most effective degradation of methylene blue was exhibited by the ZnO-biochar composite sample synthesized at a solvothermal temperature of 180 ̊C and a solvothermal time of 10 hours, achieving a degradation of 88.29%. The enhanced photodegradation performance of this composite sample is attributed to its high surface area, capacity for visible light absorption, and the dimensions of the active crystals, which can account for the high performance of the ZnO-biochar composite for photocatalytic degradation.
Co-Authors , Deviona, , Abid, Hussein Rasool Adharianti, Nia Ahmad Fadli Alfarisi, Cory Dian Alhabsy Affif Altarawneh, Mohammednoor Aman Aman Aman Aman Amelia, Rahma Amila, Khairati Amun Amri Amun Amri Annisa Ulhasanah Aqilla Cahyani Ari Sandhyavitri Arif Partama Asri, Ebel Vigrajuska Avisa, Utari Azhar, Muhammad Rizwan Azhari, Aulia Akmal Azhari, Ayu Azridjal Aziz Butar-Butar, Wahyu Tri Efendi Chairul Chairul Chairul Chairul Chairul, Chairul Delef, Fahrul Fajar Dini, Isna Drastinawati Drastinawati Drastinawati Drastinawati, Drastinawati Dumaria, Agustina Dwi Imamatul Mastura Dwi Widyaningsih Efrina, Restika Evelyn Evelyn Evelyn Evi Nadhifah Fabryza, Dhina Fadhil, Rayhan Fadhila Ulfa Fahreza, Muhammad Fajar Restuhadi Fajri Aziz, Lutvhi Fauziyah, Hidayatul Fesya Putri, Andini Fitri Zulva Hasanah Fitri, Lara Ismano Hapsoh Hasby Herdinasrul Hendro Ekwarso Idral Amri Isna Rahma Dini Iwana, Iwana Jailani, M. Fariz Jiang, Zhong Tao Komalasari Komalasari Komalasari Komalasari Komalasari Komalasari Komalasari Laia , Ferlinus Saputra Liyana , Audi Lubis, Nursiani M. Iwan Fermi M. Nanda Dwi Putra M. Yovi, M. Yovi Maria Peratenta Sembiring Maysandy, Lily Mery Sukmiwati Miran, Hussein A. Misrulina Misrulina Muhammad Zaqi Nabellia Nadhia Gasani Putri Nurfatihayati Nurul Azizah Nurwijayanti Paian Harianja Panjaitan, Zahwatul Nabila Peratenta Sembiring, Maria Praswasti PDK Wulan, Praswasti PDK Prawiranegara, Barata Aditya Primbodo , Selo Bambang Putra, Eden Putri Nawangsari, Putri Putri, Nazifa Ayu Rahman, M. Mahbubur Rahmi Adisti Raihan Daffansyah Sinaga Ramadhani , Micha Vania Reni Yenti, Silvia Renny Indriani Renny Indriani Ridwan Manda Putra Rizaldi Saputra Rozanna Sri Irianty Safridatul Audah Sarma, Deki Sativa, Oriza Septya, Fanny Sherly Fitri Rahmadhani Silvia Reni Yenti Silvia Reni Yenti Sinaga, Veranica Sitinjak, Monaeka Slamet . Soleha, Elisa Sri Djuniati Sri Yoseva Suhendri Suhendri Sukendi Sukendi Sunarno Sunarno SYAIFUL BAHRI Syamsu Herman Tao Jiang, Zhong Tarigan, Melisa Phebeyola E. Tengku Nurhidayah Tesa Agustin Utama, Panca Setia Wahyu Hidayat Waruwu, Desriang Wulandari, Revika Yahlim , Wasiah Fichtimar Yayan Setiawan Yolanda, Yogi Yoselino, Danil Yusnimar Sahan Z Zulfansyah Zelfira, Afragenia Zulfansyah Zulfansyah Zulkarnain Zulkarnain Zulkarnaini Zulkarnaini Zuqni Meldha