Calon Promotor Program Beasiswa Program Doktoral Padjadjaran Tahun 2026
Nama Lengkap : Prof. Dr. Diana Rakhmawaty Eddy, M.Si.
E-mail : [email protected]
Bidang Keahlian : Kimia Material Anorganik Fotokatalitik
Prodi S3 Calon Mahasiswa: Ilmu Kimia
Judul Penelitian yang Ditawarkan:
Nanokomposit Magnetite-Magadite dan Magnetite-Actived Carbon dari Sekam Padi untuk mengurangi surfaktan dari limbah cair
Magnetite–Magadiite and Magnetite–Activated Carbon Nanocomposites Derived from Rice Husk for Surfactant Removal from Wastewater
Abstrak:
Pertumbuhan industri laundry yang pesat di Indonesia berkontribusi signifikan terhadap pencemaran lingkungan akibat limbah surfaktan. Akumulasi surfaktan di badan air menyebabkan gangguan transfer oksigen dan toksisitas terhadap biota akuatik sehingga diperlukan teknologi pengolahan yang efektif untuk memenuhi baku mutu air limbah (maksimum 3,00 mg/L). Metode adsorpsi menjadi pilihan utama karena prosesnya yang mudah, murah, dan minim polusi sekunder. Penelitian ini bertujuan untuk mengembangkan adsorben berbasis nanokomposit magnetik dari limbah sekam padi, yaitu Nanopartikel Magnetit-Magadiite (MMNPs) dan Nanopartikel Magnetit-Karbon Aktif (ACMNPs), serta menguji dan membandingkan kinerjanya dalam mereduksi empat jenis surfaktan: anionik (Linear Alkylbenzene Sulfonate/LABS), kationik (Cetyltrimethylammonium Bromide/CTAB), zwitterionik (Cocamidopropyl Betaine/CAPB), dan nonionik (Nonylphenol/NP). Kedua material akan disintesis melalui ekstraksi silika dan karbon dari sekam padi secara simultan dengan metode refluks iradiasi microwave. Silika akan ditransformasi menjadi magadiite melalui proses hidrotermal, sementara karbon diaktivasi untuk meningkatkan porositasnya. Material tersebut kemudian dikompositkan dengan magnetit (Fe₃O₄) berukuran nano untuk menghasilkan adsorben yang mudah dipisahkan secara magnetik. Karakterisasi material akan dilakukan dengan X-ray diffraction (XRD), Fourier-transorm infrared (FTIR), scanning electrone micsoscope-energy dispersive X-ray (SEM-EDX), thermogravimetric analysis (TGA), adsorpsi N2 dengan Brunaur-Emmet-Teller (BET), vibrating sample magnetometer (VSM), dan zeta potensial. Kinerja adsorpsi akan dievaluasi secara komprehensif meliputi studi isoterm, kinetika, termodinamika, pengaruh pH dan dosis adsorben, serta uji reusability. Penelitian ini diharapkan dapat menghasilkan adsorben unggul yang aplikatif untuk remediasi limbah surfaktan sekaligus memberikan pemahaman mendalam mengenai interaksi kompleks molekul surfaktan amfifilik dengan permukaan nanopartikel bermuatan.
Abstract:
The rapid growth of the laundry industry in Indonesia has significantly contributed to environmental pollution caused by surfactant-containing wastewater. The accumulation of surfactants in water bodies disrupts oxygen transfer and causes toxicity to aquatic organisms, thereby necessitating effective treatment technologies to meet wastewater quality standards (maximum 3.00 mg/L). Adsorption has become a preferred method due to its simple operation, low cost, and minimal secondary pollution. This study aims to develop magnetic nanocomposite-based adsorbents derived from rice husk waste, namely Magnetite–Magadiite Nanoparticles (MMNPs) and Magnetite–Activated Carbon Nanoparticles (ACMNPs), and to evaluate and compare their performance in reducing four types of surfactants: anionic (Linear Alkylbenzene Sulfonate/LABS), cationic (Cetyltrimethylammonium Bromide/CTAB), zwitterionic (Cocamidopropyl Betaine/CAPB), and nonionic (Nonylphenol/NP). Both materials will be synthesized through the simultaneous extraction of silica and carbon from rice husks using a microwave-assisted reflux method. The extracted silica will be transformed into magadiite through a hydrothermal process, while the carbon will be activated to enhance its porosity. These materials will then be composited with nanosized magnetite (Fe₃O₄) to produce adsorbents that can be easily separated magnetically. Material characterization will be carried out using X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy–Energy Dispersive X-ray (SEM-EDX), Thermogravimetric Analysis (TGA), N₂ adsorption using the Brunauer–Emmett–Teller (BET) method, Vibrating Sample Magnetometer (VSM), and zeta potential analysis. Adsorption performance will be comprehensively evaluated through isotherm, kinetic, and thermodynamic studies, as well as the effects of pH and adsorbent dosage, and reusability tests. This research is expected to produce superior adsorbents applicable for surfactant wastewater remediation while also providing an in-depth understanding of the complex interactions between amphiphilic surfactant molecules and charged nanoparticle surfaces.