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All Journal VALENSI JURNAL KIMIA SAINS DAN APLIKASI Bulletin of Chemical Reaction Engineering & Catalysis The Journal of Pure and Applied Chemistry Research Jurnal Riset Kimia Jurnal Kimia dan Kemasan Jurnal Litbang Industri Indonesian Journal of Chemistry Akta Kimia Indonesia Molekul: Jurnal Ilmiah Kimia Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Jurnal Kimia dan Kemasan Jurnal Litbang Industri Journal Of Research and Education Chemistry (JREC) Jurnal Katalisator Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Kimia Unand
Wellia, Diana Vanda
Andalas University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Social Sciences Other

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Synthesis and Characterization of Hydroxyapatite/Alginate Composites: Study of pH and Sintering Influenced on the Structural, Morphological, and Clindamycin Release Behavior Wulandari, Wulandari; Islami, Dini Muthi'ah; Jamarun, Novesar; Wellia, Diana Vanda; Emriadi, Emriadi
Indonesian Journal of Chemistry Vol 24, No 2 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.84558

Abstract

The hydroxyapatite/alginate (HAp/Alg) composite was synthesized using an in-situ precipitation route. The effect of pH (8, 9, 10, and 11) and calcination temperature (300, 500, 700, and 900 °C) were studied by characterization techniques such as X-ray diffraction (XRD), Fourier-transform infrared (FTIR), and scanning electron microscopy with energy-dispersive X-ray (SEM with EDAX). XRD results show the hexagonal crystal system of HAp for each pH value and the biphase (HAp and whitelockite) for the sintering temperature at 700 and 900 °C. The FTIR spectra show no impurity peaks. SEM images revealed spherical-like (HAp/Alg-11) and flake-like (HAp/Alg-900) particles with good homogeneity, size, and shape that could be notable for biomedical utilization, such as drug delivery material. Drug loading and release ability of pure HAp, HAp/Alg-11, and HAp/Alg-900 composites have been investigated with clindamycin hydrochloride as the drug model. The maximum clindamycin HCl release from HAp, HAP/Alg-11, and HAp/Alg-900 reached 74.48, 92.75, and 69.65% in the 8th hour. HAp/Alg-11 has the highest release because it has the largest surface area of 162.584 m2/g. Antibacterial test results showed HAp/Alg-11 has antibacterial activity against Staphylococcus aureus and Escherichia coli, confirming that HAp/Alg-11 composite has the potential to be applied as drug delivery.
Utilization of Shrimp Shell Waste as Nitrogen Source in N-Doped TiO₂ for Degradation of Polyethylene Microplastics Nurhasni, Nurhasni; Izzah, Annisaul; Dwitami, Aisyah Rahma; Gumilang, Yuza Ahmad; Zilfa, Zilfa; Wellia, Diana Vanda
Jurnal Kimia Sains dan Aplikasi Vol 28, No 3 (2025): Volume 28 Issue 3 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.3.115-121

Abstract

Microplastic pollution presents a significant challenge globally, posing serious threats to aquatic ecosystems. This study explores the photocatalytic degradation of microplastics in aqueous solutions by applying nitrogen-doped TiO2 (N-TiO2) nanoparticles under visible light. The N-TiO2 nanoparticles were synthesized via the solvothermal method, utilizing chitosan derived from shrimp shell waste as a nitrogen source. The photocatalytic efficacy of the N-TiO2 nanoparticles was assessed for degrading model polyethylene microplastics, illuminated by a 50-watt LED lamp. Characteristic peak shifts in the FTIR absorption spectrum, notably at 3429 cm-1 to lower wavenumbers, and diminished amide I absorption at 1621 cm-1, confirmed the successful extraction of chitosan from shrimp shell waste. The synthesized N-TiO2 nanoparticles were in the pure anatase phase, exhibited a reduced bandgap of 2.97 eV, and showed enhanced absorption in the visible light spectrum (λ=400 – 800 nm) compared to undoped TiO2. The incorporation of nitrogen into the TiO2 matrix was validated by vibration bands at approximately 1035 cm-1 and 535 cm-1, corresponding to the Ti—N and Ti—O—Ti bonds, respectively. Optimal results were attained with TiO2 nanoparticles doped with 50% nitrogen, achieving a degradation rate of approximately 30.45% of a 250 mg/L microplastic solution over 50 hours of visible light exposure—nearly six times more effective than undoped TiO2. This study highlights the sustainable use of shrimp shell waste as a nitrogen source for enhancing TiO2 nanoparticles, showcasing their potential for environmental remediation applications.
Synthesis of Hydrophobic Coatings on Concrete Surface Using Organosilicone/TiO2 and Organosilicone/Carbon-Based Materials Wellia, Diana Vanda; Yanni, Rahma; Hidayat, Benny
Jurnal Kimia Unand Vol. 14 No. 2 (2025): November 2025
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.14.2.8-14.2025

Abstract

Surface coating methods provide protection for porous concrete surfaces against water diffusion, which can otherwise lead to structural damage and a reduction in concrete's service life. This study aims to assess the impact of varying quantities of biosynthesized TiO2 and coconut shell-derived carbon on concrete surface hydrophobicity and to compare their effectiveness in enhancing it. SEM analysis confirmed that the Organosilicone-based hydrophobic coating with 0,20 g of TiO2 and 0,20 g of carbon was uniformly distributed, covering micropores, and increasing concrete surface roughness. EDS analysis indicated a decrease in the Ca element peak and the absence of elements like Al, Fe, and K, validating the success of the concrete surface coating. FTIR analysis revealed the emergence of new absorption bands, such as 2963 cm-1 (aliphatic C-H bonds of Organosiliconee) and 477 cm-1 (Ti-O bonds), on the hydrophobic concrete surface. Contact angle measurements demonstrated hydrophobic behavior, with the B/Organosiliconee/TiO2 sample exhibiting an angle of up to 122,4º and the B/Organosiliconee/C sample up to 138,3º. Consequently, carbon derived from coconut shell waste emerges as a viable alternative for hydrophobic surface applications due to its superior hydrophobicity properties compared to TiO2.
Co-Authors Adlis Santoni Admi Admi Alvionita Alvionita Anggraini, Deby Arifah Mustaqimah Arifah Mustaqimah Arniati Labbani Asep Saefumillah Atika Syafawi Benny Hidayat Deby Anggraini Dina Nofebriani Dwi Syukur Phameswari Dwitami, Aisyah Rahma Dytta Fitria Elida Mardiah Emil Salim Emriadi - Famella Azhara Febby Alvionita GEBBY FEBRILIA IRWANDA Geliz Luh Titisari Gumilang, Yuza Ahmad Ilahi, Fitratul Islami, Dini Muthi'ah Izzah, Annisaul Jarnuzi Gunlazuardi K Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah, Khoiriah Kiki Adi Kurnia M. Rafli Habibillah Mahadika, Bella Sukma Mai Efdi Matlal Fajri Alif Melvi Muharmi Merida Saputri Muhammad Hafiz Reza Nova Andriani Nova Andriani Novesar Jamarun Nurhasni Nurhasni Nurul Pratiwi Putri Julanda Ardica Putri, Gusliani Eka Rahmadhini Anwar Rahmayeni Rahmayeni Rahmayeni Rahmiana Zein Ratesha Najela Rathesa Najeela Refilda Refilda Refinel - Reza Audina Putri Reza Audina Putri Rini Rahma Yanti Rizka Rahmadini RR. Ella Evrita Hestiandari Saepurahman, Saepurahman Safni Safni Shelvira Edelwita Siti Zahara Syafrizayanti Syafrizayanti Syukri Syukri Syukri Syukri Thalabul Ilmi Tio Putra Wendari Upita Septiani Upita Septiani Vanny Yulia Safitri Vepilia Wulanda Wulandari Wulandari Wulandari Wulandari Wulandari Wulandari Yanni, Rahma Yefrida Yefrida Yeni Stiadi Yuli Okta Fitriyani Yulia Eka Putri Yulia Eka Putri Yulizar Yusuf Zilfa Zilfa Zulhadjri Zulhadjri