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All Journal JURNAL KIMIA SAINS DAN APLIKASI
Rahmad Nuryanto
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto, SH., Tembalang, Semarang|Diponegoro University|Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering

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Eco-Friendly Chitosan-Based Biodiesel Heterogeneous Catalyst Support Membrane Retno Ariadi Lusiana; Rahmad Nuryanto; Nor Basid Adiwibawa Prasetya; Resa Putri Sherina; Dilla Dayanti
Jurnal Kimia Sains dan Aplikasi Vol 26, No 2 (2023): Volume 26 Issue 2 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.2.39-49

Abstract

A chitosan-polyvinyl pyrrolidone K-30 (Cs-PVP.K30) membrane was prepared as a heterogeneous catalyst supporting membrane in the transesterification process in the production of biodiesel from palm oil and methanol through the blend reaction between chitosan (Cs) and polyvinyl pyrrolidone K-30 polymer (PVP K-30). Several membranes were characterized by their physicochemical and catalytic properties. Based on physicochemical data, it was found that including the carbonyl group from PVP K-30 into the chitosan framework correlated with an increase in porosity, hydrophilicity, water absorption, and the degree of swelling of the membrane. The results of the analysis using Fourier Transmittance Infra-red (FTIR) showed the spectra of carbonyl (-C=O) and hydroxyl (-OH) groups at wavenumbers 1648 cm-1 and 3363 cm-1, which shows that the reaction of chitosan alloy with PVP K-30 has been successfully carried out. The catalytic site of the Cs-PVP K30-NaOH membrane in the biodiesel production process was studied under several conversion conditions. It was found that the conversion of biodiesel reached 93.90% with a reaction time of 90 minutes, a temperature of 65°C, and an oil/methanol mole ratio of 1:7.
Synthesis, Characterization of Cu, S doped TiO2 and Its Photocatalytic Activity for Degradation of Remazol Black B Abdul Haris; Gunawan Gunawan; Didik Setiyo Widodo; Rahmad Nuryanto; Retno Ariadi Lusiana; Mei Viantikasari
Jurnal Kimia Sains dan Aplikasi Vol 22, No 2 (2019): Volume 22 Issue 2 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2623.307 KB) | DOI: 10.14710/jksa.22.2.47-51

Abstract

Copper and sulfur modified TiO2(Cu-S-TiO2) photocatalyst was successfully synthesized using TiCl4, Cu(NO3)2.3H2O and H2SO4 as precursors by the sol-gel method andcalcination at 450°C for 4 hours. The synthesized photocatalyst was characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS), Diffuse Reflectance Spectroscopy (DRS), Brunauer Emmett Teller (BET) method. The XRD results showed that the Cu-S-TiO2 photocatalyst had an anatase phase with a crystal grain size of 17.54 nm. However, the SEM image of the modified TiO2 showed inhomogeneous phase due to the crystal clustering of imperfect homogenization during the synthesis and sintering processes. The patterns of EDSof Cu-S-TiO2depicted the elements of Ti, O, Cu and S with doping of Cu and S c.a. 7 and 1%, respectively. Analysis using DRS UV-Vis showed Cu-S-TiO2 was able to shift the absorption of the TiO2 photocatalyst wavelength to the visible region with a band energy gap of 1.9 eV. The BET analysis results showed that the specific surface area (SBET), pore volume (Vp) and average pore volume radius (Dp) were measured from large Cu-S-TiO2, therefore Cu-S-TiO2 had good physicochemical and photocatalytic properties. The photocatalytic activity of 0.1 g Cu-S-TiO2 with 15 Watt tungsten light irradiation for 4 h was able to degrade 50 mL remazol black B 10 mg/L c.a. 92.60 %.
Penambahan EDTA sebagai Inhibitor pada Laju Korosi Logam Tembaga Rahmad Nuryanto; Retno Ariadi Lusiana; Khabibi Khabibi
Jurnal Kimia Sains dan Aplikasi Vol 10, No 2 (2007): Volume 10 Issue 2 Year 2007
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (165.391 KB) | DOI: 10.14710/jksa.10.2.45-49

Abstract

Telah dilakukan penelitian tentang pengaruh penambahan agen chelat EDTA untuk menghambat laju korosi pada logam tembaga. Penelitian ini menggunakan metoda penentuan korosi melalui pengukuran resistansi logam, di mana kenaikan resistansi pada logam tersebut menandai bahwa logam yang terkorosi semakin meningkat. Pengukuran korosi dilakukan terhadap kawat tembaga dan kawat tembaga yang dichelat dengan media pengkorosi H2SO4 1M. Hasil penelitian terhadap kawat tembaga dengan panjang 3 m dan diameter 0,5 mm yang dichelat dengan EDTA 1 M menunjukkan penurunan korosi sebesar 20,6%Kata kunci: inhibitor, korosi, EDTA, tembaga
Development and Characterization of a Chitosan and Polyvinyl Alcohol (CS/PVP)-Based Slow-Release Urea Fertilizer Membrane Retno Ariadi Lusiana; Khabibi Khabibi; Rahmad Nuryanto; Muhammad Ridho Shofwan Al Aziz
Jurnal Kimia Sains dan Aplikasi Vol 27, No 10 (2024): Volume 27 Issue 10 Year 2024
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.27.10.470-476

Abstract

A slow-release test of urea fertilizer was conducted using chitosan-urea (CS-U) and chitosan/polyvinyl pyrrolidone K30-urea (CS/PVP-U) membranes. The urea membrane synthesis involved a blending method, with PVP K30 added as a component. The slow-release capabilities of CS-U, CS/PVP1-U, CS/PVP2-U, CS/PVP3-U, and CS/PVP4-U membranes were compared. FTIR results showed an increased intensity of the primary NH double peak at 1587 cm-1 and 1640 cm-1, while the C=O spectrum shifted from 1640 to 1647 cm-1 and the -OH group from 3354 cm-1 to 3362 cm-1, indicating hydrogen bond formation in CS/PVP-U. XRD analysis confirmed the membrane’s amorphous structure, and FE-SEM and AFM studies revealed morphology and roughness differences, with CS/PVP4-U having the largest cross-sectional diameter. The release study showed that PVP-modified chitosan membranes increased urea release, achieving 60 ppm/2 days for the first 16 days, then decreasing to about 55 ppm through day 30, with partial urea release controlled over time. This suggests that SRF fertilizer can effectively control urea release into the environment.
Synthesis of Styrofoam Waste-Derived Activated Carbon as an Electron Extractor for Modifying Cu/P-CuSCN/N-Cu₂O/ITO Photovoltaic Cells Dheani Laily; Aisyah Wahyu Fitriani; Endar Aldi Hanantya; Rahmad Nuryanto
Jurnal Kimia Sains dan Aplikasi Vol 27, No 10 (2024): Volume 27 Issue 10 Year 2024
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.27.10.485-490

Abstract

Activated carbon synthesized from styrofoam waste was applied as an electron extractor to enhance the performance of Cu/p-CuSCN/n-Cu2O/ITO-based photovoltaic cells. The widespread use of plastic products, particularly styrofoam, has led to severe environmental pollution due to its long decomposition time. Styrofoam waste-derived activated carbon utilizes polystyrene, which is rich in carbon, to produce high-surface-area materials. In this study, the activated carbon enhances the efficiency of photogenerated electron separation and extraction in photovoltaic cells. Characterization results indicate that the activated carbon has a surface area of 1,865.04 m2/g, a pore volume of 1.25 cm3/g, and a pore diameter of 2.53–2.68 nm, with a direct band gap energy of 4.33 eV. Voltage testing on the photovoltaic cells demonstrated a significant increase, with the highest voltage reaching 209.67 mV in the 5 mg activated carbon variation, representing a 34.84% improvement. The application of activated carbon in Cu/p-CuSCN/n-Cu2O/ITO-based photovoltaic cells provided a notable voltage increase, confirming its effectiveness as an electron extractor.
Co-Authors Abdul Haris Aisyah Wahyu Fitriani Dheani Laily Didik Setiyo Widodo Dilla Dayanti Endar Aldi Hanantya Gunawan Gunawan khabibi Khabibi Mei Viantikasari Muhammad Ridho Shofwan Al Aziz Nor Basid Adiwibawa Prasetya Resa Putri Sherina Retno Ariadi Lusiana