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All Journal Unesa Journal of Chemistry
Dina Kartika Maharani
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Surabaya
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology

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Sintesis Hijau Nanopartikel TiO2 Menggunakan Ekstrak Daun Belimbing Wuluh (Averrhoa blimbi L.) dan Aktivitas Antibakterinya Terhadap Escherichia coli Nur Azizah Wanda Triyaruhana; Dina Kartika Maharani
Unesa Journal of Chemistry Vol. 15 No. 3 (2026): Vol 15 No 3 (2026): On progress
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v15n3.p112-119

Abstract

TiO2 nanoparticles were successfully synthesized by biosynthesis method specifically green synthesis method using Averrhoa bilimbi L. (bilimbi) leaf extract as both a reducing and capping agent. The purpose of this study was to characterize the synthesized TiO2 nanoparticles and its antibacterial activity against the Gram-negative bacteria Escherichia coli. Characterization was carried out using Fourier-Transform Infrared Spectroscopy (FTIR) and X-Ray Powder Diffraction (XRD). The synthesized TiO2 nanoparticles exhibited an anatase phase, with an average crystallite size of 12.9 nm and a crystallinity of 97.81%. Antibacterial activity tests against Escherichia coli across various samples Ti-BW20 and Ti-BW40, yielded inhibition zone diameters of 7.82 mm and 9.87 mm, respectively.
SINTESIS DAN KARAKTERISASI NANOKOMPOSIT TIO2-SELULOSA DARI LIMBAH AMPAS TEBU Cindhy Novita Sari; Dina Kartika Maharani
Unesa Journal of Chemistry Vol. 14 No. 2 (2025): Vol 14 No 2 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

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Abstract

Sugarcane bagasse is an abundant agricultural waste in Indonesia, reaching more than 750,000 tons annually, yet it remains underutilized. It contains a high cellulose content of up to 52.7%, one of the highest among agricultural residues. Considering its high fiber content and wide availability, sugarcane bagasse has significant potential to be recycled into high-value materials, including nanocellulose, a nanoscale biopolymer with high surface area, mechanical strength, and crystallinity. This study explores the utilization of cellulose derived from sugarcane bagasse, which was subsequently composited with titanium dioxide (TiO₂) nanoparticles to form nanocomposites. Cellulose isolation was carried out using a combined chemical and mechanical method involving alkali treatment, bleaching, and acid hydrolysis, followed by ultrasonication. The nanocomposite synthesis was performed through a wet dispersion method using a water–ethanol mixture. XRD analysis confirmed the successful isolation of nanocellulose, as indicated by an increase in crystallinity index from 51.37% to 70.55% after isolation, with crystal sizes in the nanometer range, that is 4.31 nm for nanocellulose and 35.41 nm for the nanocomposite. FTIR characterization corroborates the success of isolation, showing a decrease in the intensity of functional groups associated with amorphous components such as C=O and aromatic C=C, from 0.0181 to 0.0131 and from 0.0314 to 0.0140, respectively.
Co-Authors Cindhy Novita Sari Nur Azizah Wanda Triyaruhana