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All Journal POSITRON Jurnal Kimia Riset Acta Chimica Asiana
Sugandi, Didiek
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Chemistry Energy Physics

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Sunlight Assisted Degradation of Linear Alkylbenzene Sulfonate by Floating Catalyst TiO2-Coconut Fiber Sugandi, Didiek; Agustiawan, Deri; Wijayanto, Ericco; Vebriyanti, Lo Mei Ly; Panaya, Gabriela Yenti Landang; Wahyuni, Nelly
POSITRON Vol 13, No 1 (2023): Vol. 13 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v13i1.58251

Abstract

The increasing number of laundry businesses in Pontianak causes increased laundry waste, which is dangerous for health and the environment because anionic surfactants such as Linear Alkylbenzene Sulfonate (LAS) are hard degradable. Photocatalyst is a method that can be used to degrade the LAS structure. TiO2 carried in coconut fiber can optimize sunlight irradiation in degrading LAS content when light reaches the water's surface. This study aims to determine the characteristics and optimum activity time of photocatalyst TiO2-coconut fiber in degrading LAS. Photocatalyst characterization was carried out using XRD, XRF, and DR-UV, while the optimum activity test of photocatalysts in degrading LAS was carried out using a UV-Vis spectrophotometer. XRD diffractogram analysis showed the peaks of coconut fiber at 2θ = 22.2º, 34.8º and TiO2 at 2θ = 25.3º, 37.8º, 48.1º, 55.1º, and 62.1º. The TiO2 attached to the fiber after being synthesized was 21.12%. The band gap of TiO2 and TiO2-coconut fiber is 3.21 and 3.18 eV, with light absorption at 386.5 and 390.3 nm. Photocatalyst was carried out in LAS with a mass ratio of TiO2 and coconut fiber of 20:80; 30:70; 40:60, and 50:50 w/w with a time range of 0, 30, 60, 90, and 120 minutes. The results of photocatalysis of TiO2-coconut fiber in a ratio of 20:80 w/w showed the optimum photocatalytic activity at 120 minutes with the highest degradation rate of 80.43%. This research is expected to be applied as an alternative to handling LAS in laundry industry waste.
Identifikasi Jenis Mikroplastik dan Logam Berat di Air Sungai Kapuas Kota Pontianak Sugandi, Didiek; Agustiawan, Deri; Febriyanti, Shafira Viana; Yudi, Yulius; Wahyuni, Nelly
POSITRON Vol 11, No 2 (2021): Vol. 11 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (800.866 KB) | DOI: 10.26418/positron.v11i2.49355

Abstract

Sungai Kapuas berperan sebagai sarana transportasi, sumber air baku untuk PDAM, tempat rekreasi, hingga menjadi tempat pembuangan sampah dan limbah bagi masyarakat Pontianak, Kalimantan Barat. Sampah plastik merupakan sampah yang paling banyak dihasilkan karena tingginya aktivitas masyarakat. Sampah plastik yang terpapar sinar ultraviolet atau proses lainnya dapat terdekomposisi menjadi mikroplastik (5 mm - 1 µm) yang dapat berdampak negatif bagi ekosistem perairan bahkan manusia. Penelitian ini bertujuan mengidentifikasi jenis polimer dan logam berat pada mikroplastik yang ada di air Sungai Kapuas. Pengambilan sampel pada 6 titik lokasi didasarkan pada outlet pasar, pelabuhan, penyebrangan feri dan industri. Identifikasi kelimpahan, bentuk dan warna dilakukan dengan menggunakan mikroskop, karakterisasi jenis polimer dengan Fourier Transform Infra Red (FTIR) dan logam berat dengan Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX). Hasil penelitian menunjukkan kelimpahan mikroplastik di Sungai Kapuas sebesar 943,3 partikel/L dengan persentase terbesar berbentuk filamen (33%) dan  fragmen (33%). Karakterisasi gugus fungsi dengan FTIR menunjukkan adanya plastik jenis polietilena (PE) pada serapan 2918 cm-1, polipropilena (PP) pada serapan 2917 cm-1, polistirena (PS) pada serapan 3348 cm-1, 2917 cm-1, 1397 cm-1, politetraflouoroetilena (PTPE) pada serapan 1030 cm-1 dan poliamida pada serapan 1586 cm-1. Berdasarkan analisa SEM-EDX, sampel mikroplastik mengandung unsur C, O, Na, Al, Si, Cl, dan K serta tidak ditemukan logam berat. Variasi bentuk, jenis, dan komposisi unsur-unsur pada sampel mikroplastik disebabkan karena adanya perbedaan aktivitas masyarakat di sekitar Sungai Kapuas Kota Pontianak. Penelitian ini dapat menjadi dasar dalam melakukan kegiatan konservasi dan mitigasi dari dampak polusi mikroplastik di kawasan Sungai Kapuas Kota Pontianak.
DEGRADATION OF TETRACYCLINE BY FLOATING PHOTOCATALYST TiO2/Ni-COCONUT FIBER Putri, Lavena Imelda; Agustiawan, Deri; Sugandi, Didiek; Arfida, Khaizurani; Mardhatilla; Wahyuni, Nelly
Jurnal Kimia Riset Vol. 8 No. 2 (2023): December
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v8i2.50848

Abstract

The photocatalyst process involves light (photons) as an energy source and catalysts such as TiO2 to accelerate the reaction. Efforts are made to reduce the band gap energy of TiO2 by shifting the absorption towards visible light using metal cation doping, such as Ni2+, and they can float on the surface with coconut fiber. XRD characteristics with TiO2 diffractogram experienced a 2θ shift as an indication that Ni has entered the TiO2 structure and seen some peaks decreased in intensity after being embedded with coconut fiber as an indication that TiO2/Ni has successfully attached to the fiber. The band gap energy on TiO2 is 3.21 eV with a wavelength of 386.5 nm in UV light. TiO2/Ni-coconut fiber experienced a shift in band gap energy to 3.09 eV with a wavelength of 400.9 nm, which is in visible light. This indicates that Ni has successfully entered the TiO2 structure. The TiO2/Ni catalyst embraced with coconut fiber has a higher degradation activity than the catalyst without an embrainer, with a percent degradation of 28.66% for 120 minutes of irradiation. This is influenced by the amount of light that can be absorbed during the photocatalysis process.  
DEGRADATION OF HUMIC ACID BY FLOATING PHOTOCATALYST TiO2/Cu-ARECA FIBER Sugandi, Didiek; Agustiawan, Deri; Wijayanto, Ericco; Marpaung, Maria Oktavia Putri; Ayyash, Muhammad Yahya; Wahyuni, Nelly
Jurnal Kimia Riset Vol. 9 No. 1 (2024): June
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v9i1.50850

Abstract

 The photocatalyst method is effective in degrading humic acid into O2 and H2 compoundsthat are more environmentally friendly. The photocatalysis process involves light andsemiconductors such as TiO2 to accelerate the reaction rate. Therefore, modification of TiO2is needed to shift light absorption to visible light by using Cu2+ doping and areca fiber. XRDcharacterization shows that Merck's TiO2 has shifted at 2θ, indicating that Cu has enteredthe TiO2 structure, and several peaks have reduced in intensity after being embedded withareca fiber, indicating that TiO2/Cu has successfully attached to areca fiber. FTIR resultsshow that TiO2/Cu has been attached to the areca fiber, which is marked by shifting andweakening the intensity of the Ti-O-Cu wave number absorption. The test results show thatTiO2/Cu embedded in areca fiber had higher degradation activity than TiO2/Cu withoutembedded, with a percent degradation of 54% for 180 minutes of irradiation. These resultsprove that TiO2/Cu floated to the surface of the solution can optimize irradiation so that itis effective in the degradation process.
Fotocatalytic degradation of methylene blue by floating TiO2-coconut fiber Sugandi, Didiek; Wahyuni, Nelly; Rahmalia, Winda
Acta Chimica Asiana Vol. 7 No. 1 (2024)
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.v7i1.183

Abstract

Indonesia's expanding industrial sector has resulted in an increase in the use of dyes. Methylene blue (MB), a dye used in the batik and textile industries, has the potential to be detrimental to people and the environment. Recent research indicates that the TiO2 photocatalyst has the ability to reduce MB. TiO2 transported in coconut fiber can improve illumination in the photocatalysis process. The purpose of this study is to examine the properties and activity of a TiO2-coconut fiber photocatalyst. SEM-EDX was used to characterize the morphology and composition of floating catalysts, and Fourier transform infrared (FT-IR) was used to characterize the functional groups. At 120 minutes, TiO2-coconut fiber photocatalysis with a mass ratio of 20:80 w/w demonstrated the maximum degradation of 62.72%. The SEM-EDX data demonstrate the morphology of TiO2 distribution on the surface of coconut fiber, which is distinguished by the presence of the main elements O, Ti, and C. The FT-IR study results demonstrate a shift and decrease in Ti-O absorption intensity from 756,09 cm1 to 721,38 cm1, indicating the presence of Ti-O-C bonds. It is hoped that this research will be useful in the treatment of MB in textile industry waste or other organic waste.
Co-Authors Agustiawan, Deri Arfida, Khaizurani Ayyash, Muhammad Yahya Febriyanti, Shafira Viana Mardhatilla Marpaung, Maria Oktavia Putri Nelly Wahyuni Panaya, Gabriela Yenti Landang Putri, Lavena Imelda Vebriyanti, Lo Mei Ly Wijayanto, Ericco Winda Rahmalia Yudi, Yulius