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All Journal POSITRON Jurnal Kelautan Tropis Jurnal Kimia Riset
Agustiawan, Deri
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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.
Thermostability and Photostability of Shrimp Waste Oil Based on Sun Protection Factor Value, Erythema Transmission, Pigmentation Transmission and Free Fatty Acid Content Agustiawan, Deri; Rahmalia, Winda; Alimuddin, Andi Hairil; Prayitno, Dwi Imam; Sayekti, Endah
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22775

Abstract

The high production of shrimp is accompanied by an increase in by-products (cephalothorax, carapace, and tail), which are discarded as waste. Therefore, a solution is needed to convert shrimp waste into economic value products like shrimp waste oil (SWO). SWO contains fatty acids and astaxanthin, which have antioxidant activity to scavenge free radicals, so it can prevent skin damage such as wrinkles and dryness. Due to its fatty acids and astaxanthin content, SWO can be applied as a sunscreen. However, heating and irradiation can degrade bioactive compounds that are beneficial for health. Thermostability and photostability tests are needed to determine the best storage conditions for SWO based on sun protector factor (SPF) values, erythema transmission (%Te), pigmentation transmission (%Tp), and free fatty acid (FFA) content. The yield of SWO obtained was 2.569% from 100 grams of dry shrimp waste weight. Analysis by using FTIR showed the presence of astaxanthin content in SWO, while GC-MS showed that the SWO contains up to 32.66% of hexanoic acid. SWO thermostability and photostability tests showed a decrease in SPF values and an increase in %Te and %Tp as heating and irradiation time increased. This is due to the photobleaching effect. There was no significant change in the FFA value, indicating that SWO is quite resistant to heating and irradiation.
Co-Authors Andi Hairil Alimuddin Arfida, Khaizurani Ayyash, Muhammad Yahya Endah Sayekti Febriyanti, Shafira Viana Mardhatilla Marpaung, Maria Oktavia Putri Nelly Wahyuni Panaya, Gabriela Yenti Landang Prayitno, Dwi Imam Putri, Lavena Imelda Sugandi, Didiek Vebriyanti, Lo Mei Ly Wijayanto, Ericco Winda Rahmalia Yudi, Yulius