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All Journal Seminar Nasional Teknik Kimia Kejuangan CHEMPUBLISH JOURNAL Science and Technology Indonesia Jurnal Kartika Kimia Fullerene Journal of Chemistry Jurnal Sains dan Edukasi Sains JURNAL REKAYASA KIMIA & LINGKUNGAN
Kapti Riyani
Jurusan Kimia FMIPA Universitas Jenderal Soedirman
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Other

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Sintesis dan Karaterisasi CuO/rGO Maulana, M Sifal; Riyani, Kapti; Setyaningtyas, Tien
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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Abstract

Semiconductor material is a material that is widely used in the chemical industry, especially as a photocatalyst. CuO is a semiconductor material that is active in the visible light range. Semiconductor materials can undergo recombination, rGO was used as a composite material into CuO to reduce recombination in this study. This study aims to look at the characteristics of the synthesized CuO/rGO. The processes performed include synthesis of CuO/rGO and characterization of CuO/rGO. The XRD results show the peaks of the diffractogram indicating of rGO peaks interpreted (002), peaks at (110), (-111), (111), (-202), (020), (202), (-113), (- 331), (220), (311) and (004) indicate the monoclinic phase of CuO has been formed. FTIR results indicating Cu-OH absorption show peak at wave numbers 3441.0 cm-1 and 894.97 cm-1, O-C-O vibrations present in CuO/rGO indicating adsorption at 2360.8 cm-1, 1975.1 and 1512 .1 cm-1 appears due to the C=C stretching vibrations in the rGO layer, 1033.8 cm-1 absorbs C-O stretching vibrations and 609.51 and 439.77 cm-1 have relative peaks indicating Cu-O stretching vibrations. The DRS results show that CuO/rGO has band gap value of 1.54 eV.
The Treatment of Phenol in Batik Wastewater by TiO2 -Copper Oxide (CuO And Cu2O) Photocatalyst Afifah, Dini Nur; Riyani, Kapti; Setyaningtiyas, Tien; Hasanah, Yeti Rusmiati; Mufarij, Adam
Jurnal Kartika Kimia Vol 5 No 1 (2022): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v5i1.110

Abstract

Phenol is an organic material in batik waste that must be processed before disposal because it is carcinogenic and can reduce dissolved oxygen levels. The method used to treat phenol is Advanced Oxidation Process (AOPs). The AOPs method is a waste treatment technology with free radicals to degrade pollutants into CO2 and H2O. Oxidizing agents are hydroxyl radicals (•OH) produced by certain materials, one of which is TiO2. Although proven capable of degrading organic pollutants, the use of TiO2 still encounters a reasonably significant band gap energy constraint for TiO2 (3.2 eV). The modifications carried out in this study were the addition of copper (Cu) dopants to reduce the TiO2 band gap and electron trapping to prevent electron and hole recombination. The synthesis of TiO2-Cu oxide was carried out by deposition method using TiO2 and CuCl2.5H2O as Cu precursors. The results showed that the addition of Cu to TiO2 reduced the band gap energy up to 2.25 eV. The data showed that phenol treatment using TiO2:Cu (98:2) for 6 hours at pH 2, under the influence of a tungsten lamp, could reduce phenol up to 98.03%. The photodegradation process with TiO2:Cu ratio and the same pH can occur more quickly with a UV lamp for 2 hours. The amount of phenol that can be degraded under these conditions is 98.23%. Keywords: Phenol, TiO2, TiO2 doped Cu Oxide
Degradasi Zat Warna Congo Red Menggunakan Komposit TiO2 Termodifikasi Bentonit-Alginat Paramitha, Sylvia; Riyani, Kapti; Setyaningtyas, Tien
Jurnal Kimia Fullerene Vol 9 No 2 (2024): Fullerene Journal Of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v9i2.705

Abstract

Congo red is a synthetic dye whose waste needs to be minimized using a photodegradation method with bentonite-alginate-modified TiO2 composite as a photocatalyst. This research aims to determine the characteristics of bentonite-alginate modified TiO2 composite and its effect as a photocatalyst in the degradation of congo red. The bentonite-alginate modified TiO2 composite has a characteristic band gap energy of 3.07 eV with TiO2 diffraction peaks in the anatase, bentonite, and semi-crystalline alginate phases with irregular sphere-like morphology. Bentonite-alginate modified TiO2 composite showed the best activity at pH 7 for 3 hours of irradiation with a TiO2-bentonite mass ratio of 2:4 which showed a degradation percentage of 38.86% in UV light and 44.95% in visible light.
Adsorption of Malachite Green Dye by Magnetic Carboxymethyl Chitosan Kurniasih, Mardiyah; Setyaningtyas, Tien; Riyani, Kapti; Luthfia, Adilla; Aghniya, Imtiyazul
Jurnal Rekayasa Kimia & Lingkungan Vol 19, No 2 (2024): Jurnal Rekayasa Kimia & Lingkungan (December, 2024)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v19i2.36424

Abstract

Malachite green dye is widely used in the textile industry. Wastewater contaminated with malachite green dye threatens aquatic life and human health. Therefore, adsorption is needed in the dye waste treatment process. This research aims to synthesize magnetic carboxymethyl chitosan as an adsorbent for malachite green dye. Magnetic carboxymethyl chitosan was synthesized via a coprecipitation method and analyzed using FTIR. Batch experiments were used to study the adsorption of malachite green dye under adsorption parameters, such as the effects of pH and time, adsorption kinetics, isotherms, and reusability. The research results show that at pH 4, malachite green adsorbed most effectively into magnetic carboxymethyl chitosan. The pseudo-second-order kinetic model and the Langmuir adsorption isotherm model describe the adsorption process. Reduction for malachite green chitosan, carboxymethyl chitosan, and magnetic carboxymethyl chitosan were 34.19, 83.24, and 91.34%, respectively.
Construction of Ternary Heterojunction g-C3N4 /BiVO4 /GQDs Nanocomposite and Its Methylene Blue Photodegradation Performance Arieveali, Heroldinho; Setyaningtyas, Tien; Riyani, Kapti; Riapanitra, Anung
Science and Technology Indonesia Vol. 10 No. 3 (2025): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.3.777-788

Abstract

Ternary heterojunction g-C3N4/BiVO4/GQDs (CBG) composite photocatalysts were successfully made by high-temperature solidstate method. The prepared CBG photocatalyst was used to degrade the methylene blue (MB) solution under the simulation of visible light irradiation. The analysis of photocatalytic activity was carried out in the parameters of mass variation of composite components, pH of MB solution, and kinetic rate measurement. The results showed that the adsorption-photocatalysis synergy effect occurred at its best in CBG-20 samples with pH 9 in MB solution with a degradation kinetic rate following the pseudo-first order within 150 min of removal time as the optimum condition that could degrade MB by 94.81%. The result showed that the photocatalytic activity of theternary composite was higher than that of pristine g-C3N4, BiVO4, or the binary composite of g-C3N4/BiVO4. Trapping experiments results support the direct dual Z-scheme which shows that ·O2- is the most significant radical for the photocatalytic degradation of MB. The prepared ternary composites show outstanding application prospects in wastewater treatment.
Modification of ZnO/Perlite for Methylene Blue Photodegradation Burhanudin; Setyaningtyas, Tien; Riyani, Kapti
Chempublish Journal Vol. 8 No. 2 (2024): Chempublish Journal
Publisher : Department of Chemistry, Faculty of Science and Technology Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/chp.v8i2.37550

Abstract

Penggunaan Komposit ZnO/Perlite untuk Fotodegradasi Zat Warna Metilen Biru Burhanudin, Burhanudin; Setyaningtyas, Tien; Riyani, Kapti
Jurnal Sains dan Edukasi Sains Vol. 8 No. 2 (2025): Jurnal Sains dan Edukasi Sains
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/juses.v8i2p150-158

Abstract

Limbah pembuangan pada industri yang semakin berkembang menyebabkan pencemaran yang disebabkan oleh zat pencemar. Limbah cair yang berasal dari industri tekstil adalah salah satu limbah yang mengandung zat warna beracun seperti metilen biru yang tidak mudah terurai di lingkungan. Maka dari itu, perlu dilakukan suatu cara untuk mengatasi permasalahan tersebut dengan material fotokatalisis. Material fotokatalis yang sering digunakan yaitu oksida logam semikonduktor seperti ZnO. Namun, semikonduktor ZnO masih memiliki keterbatasan dalam aplikasinya. Untuk mengatasi keterbatasan tersebut, katalis ZnO akan dikombinasikan dengan material pendukung seperti perlite yang merupakan material berpori dan ringan. Penelitian ini bertujuan untuk menguji keefektifan ZnO/Perlite dalam mendegradasi zat warna metilen biru. Komposit ZnO/Perlite dengan komposisi 20% menunjukkan aktivitas fotokatalitik yang paling tinggi dibandingkan komposit ZnO/Perlite dengan komposisi 30% dan 10%. Kondisi optimum pada komposit ZnO/Perlite 20% dalam mendegradasi metilen biru dicapai pada kondisi pH 11 dengan massa 0,3 gram dan penyinaran sinar ultraviolet selama 2 jam, aktivitas fotokatalitik yang dihasilkan sebesar 47,59% serta gabungan adsorpsi dan aktivitas fotokatalitik sebesar 78,1%. Pada analisis XRD diperoleh karakteristik puncak kristal ZnO berstruktur wurtzite pada (100); (002); (101); (102); (110); (103); dan (112); sedangkan sudut difraksi 2θ (10o-30o) menunjukkan sifat amorf perlite. Pada hasil DRS diperoleh bahwa komposit ZnO/Perlite 20% memiliki nilai celah pita (band gap) sebesar 3,21 eV.
Co-Authors Afifah, Dini Nur Aghniya, Imtiyazul Anung Riapanitra Arieveali, Heroldinho Burhanudin Burhanudin Burhanudin Hasanah, Yeti Rusmiati Luthfia, Adilla Mardiyah Kurniasih Maulana, M Sifal Mufarij, Adam Paramitha, Sylvia Setyaningtiyas, Tien Tien Setyaningtyas