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All Journal Acta Chimica Asiana Jurnal Pijar MIPA Molekul: Jurnal Ilmiah Kimia
Chen, Chang-Nan
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Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology Mathematics Physics

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Fluorescent Turn-off Probe of Ni2+ Based Nitrogen-Doped Carbon Dots Kamali, SIti Raudhatul; Chen, Chang-Nan; Agrawal, Dinesh Chandra; Wei, Tai-Huei
Molekul Vol 19 No 2 (2024)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2024.19.2.9964

Abstract

ABSTRACT: An effective and facile method of generating nitrogen-doped carbon dots (N-CD) by microwave irradiation is presented in this study. A precursor, succinic acid (SA), and a nitrogen source, bis-(3-aminopropyl)-amine (BAPA), were used to obtain N-CD. A precious quantum yield (QY) of 49.0% was obtained from the preparation of N-CD, which was well-soluble in water. The N-CD material was highly selective and sensitive for the detection of nickel ion (Ni2+), with a detection limit of 0.26 μM and a linear concentration range of 5-175 μM. The quenching of the N-CD by the presence of Ni2+ was referred to formation of complexes because of the interaction of Ni2+ on the N-CD. Hence, the proposed study has great promise regarding Ni2+ detection in broad applications. Keywords: Microwave, Ni2+, nitrogen-doped carbon dots.
Uji Efektivitas Mikrofilter Masker Berbasis Biopolimer Serat Selulosa Limbah Jerami Rofiqoh, Hazi; Ummah, Baiq Hizanatul; Hanafi, Imam Galih; Budhiartini, Baiq Nely; Murniati, Murniati; Chen, Chang-Nan
Acta Chimica Asiana Vol. 8 No. 1 (2025)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v8i1.172

Abstract

Straw waste, which is often underutilized, contains abundant cellulose that holds potential as a raw material for environmentally friendly filtration technologies. The conversion of agricultural waste into value-added products, such as mask microfilters, aligns with the increasing demand for sustainable materials, particularly in the context of public health protection. Harnessing cellulose from straw offers a promising alternative to synthetic fibers commonly used in mask production, while simultaneously addressing waste management challenges. This study aims to determine the characterization of microfilter masks from straw waste and the effectiveness of straw microfilters used in cloth masks. Cellulose from straw waste can be used as a mask microfilter by going through several stages, such as: preparation, extraction, delignification, bleaching, characterization, and making mask microfilters and effectiveness tests. The characterization of structure, morphology and topology from the straw waste cellulose has not been fully degraded from lignin as shown from the aromatic C = C stretching vibrations on lignin at wave numbers 1638.34 cm-1, 1648 cm-1, and 1583.56 cm-1 of FTIR also SEM tools at 3600 times magnification. The effectiveness of the microfilter mask is 94% and 91%  as evidenced by each bacterial filtration test and the decreasing data of the dust filtration test.
Synthesis of Green Carbon Dots from Nephelium Lappaceum L. Seeds Kamali, Siti Raudhatul; Hamdiani, Saprini; Hermanto, Dhony; Saputri, Dinar Suksmayu; Chen, Chang-Nan
Jurnal Pijar Mipa Vol. 19 No. 3 (2024): May 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i3.6708

Abstract

In this study, rambutan (Nephelium Lappaceum L.) seeds were used to fabricate green carbon dots (gCDs) by employing a hydrothermal process. The synthesized CDs were evaluated using Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) for the structural properties as well as UV-Vis and fluorescence spectrophotometry for the optical properties. UV-Vis examination revealed that the produced gCDs showed emission-dependent photoluminescence excitation, with two absorption peaks at 265 nm and 330 nm. The presence of functional groups and chemical composition such as C=C, C=O, -COOH, and -OH on the surface of gCDs was confirmed by the results of FTIR and XPS spectra. Consequently, gCDs present several opportunities for exploration in a range of applications.
Co-Authors Agrawal, Dinesh Chandra Budhiartini, Baiq Nely Dhony Hermanto Hanafi, Imam Galih Murniati . Rofiqoh, Hazi Saprini Hamdiani Saputri, Dinar Suksmayu Siti Raudhatul Kamali Ummah, Baiq Hizanatul Wei, Tai-Huei