La Ode Agus Salim

ISTEK 'Aisyiyah Kendari · Department of Chemistry

The modification of ternary metal oxide to improve the photoelectrocatalysis (PEC) properties of TiO2 photocatalyst is a hot issue in environmental and resource applications. Herein, we present a novel photoelectrocatalytst of Se doped-TiO2/Ti nanotube arrays (Se@TiO2/Ti-NTAs) for high-efficiency degradation of diazinon pesticide. The Se@TiO2/Ti-NT...

The effect of Te doping of the TiO2/Ti nanotube arrays (NTAs) on the photoelectrochemical chemical oxygen demand (COD) detection has been investigated. It is found that the Te doping has enhanced the photoelectrocatalytic properties of the TiO2/Ti NTAs electrode. This indicated by the linearity, accuracy, and repeatability of measurement of the tes...

This study aims to obtain the results of the optimization of biological hydrolysis of oil palm empty fruit bunches (OPEFB) using Aspergillus niger (A. niger) InaCC F57. The optimized hydrolysis parameters include incubation temperature, substrate pH, incubation time, and additional parameters in the form of substrate concentration and the addition...

Lichen Usnea sp. is one of the sources of natural bioactive compounds which are currently being developed as medicinal ingredients. The purpose of this study was the isolation and identification of secondary metabolites from methanol extract, toxicity test and antioxidant activity of Usnea sp. Lichen was isolated by maceration using methanol solven...

Fipronil contamination in agricultural products and livestock has become a growing concern because its long-term exposure to its toxicity effect on humans may cause the failure of organs, like kidney and liver, and neurological disorders. Early detection of this substance's presence in agricultural and livestock products should be established to mi...

The concern over increasing environmental contamination by dye agents from textile industries, such as Reactive yellow 105, requires a special catalyst that can rapidly and effectively eradicate the dye chemical. Here, we demonstrate a new design of catalyst, i.e., Te doped TiO2/Ti composite electrode, that promotes highly active charge transfer wi...

We investigated methylene blue adsorption capacity and photodegradation removal efficiency using an S-TiO 2 @clay composite by irradiating a commercial Tungsten halogen lamp in a reactor. The same experimental conditions were applied to clay and pristine TiO 2 as a reference. Morphology surface area, chemical bonding, and optical properties of thos...

Photoelectrochemical oxidation processes offer a highly sensitive method to detect organic pollutants from wastewaters. Photoactive semiconducting material is the key factor in this process that accelerates the oxidation of the organic pollutant agent for sensitive detection. Chalcogenide-doped TiO2 system has so far come up as a potential photocat...

This study examines biodiesel production from crude palm oil (CPO) through an esterification reaction with methanol as a solvent and transesterification reactions catalyzed by calcium oxide (K2O). K2O catalyst synthesized from the oil palm empty fruit bunches ash (PEFB-ash) with impregnation method and calcined at a temperature of 700 ºC. The ester...

In this study, Ag-doped TiO2 nanoparticles (NTA) were synthesized and tested for their activity against the fungus Phytophthora palmivora (P. palmivora). The synthesis of NTA was carried out by sonification method at a frequency of 40 kHz and an ultrasonic intensity of 0.96 kWm⁻². The antifungal activity test was carried out with two treatments, na...

Photoelectrochemical oxidation processes offer a highly sensitive method to detect organic pollutants from wastewaters. Photoactive semiconducting material is the key factor in this process that accelerates the oxidation of the organic pollutant agent for sensitive detection. Chalcogenide doped TiO 2 system has so far come up as a potential photoca...

Lichen Usnea sp. is potential as a new natural medicine. This study report isolation of secondary metabolites from lichen Usnea sp. and α-glucosidase inhibitory, which is potential as an antidiabetic agent. Lichen powder was macerated using methanol, separated using column chromatography gravity and thin-layer chromatography. The crystalline was is...

This study is the stage of developing a phenol detection electrochemical sensor. Phenol is one of the organic pollutants harmful to human life and ecosystems. The development of this sensor was carried out by studying the use of TiO2 anatase as a modifier of graphene electrodes. The mass of TiO2 anatase was varied, while the mass of graphene and pa...

In the present study, an electrochemical sensor for the determination of Cu(II) ions in aqueous solutions was introduced. This study proposes an electrochemical method using the calyx [6]arene-TiO2 nanocomposite modified carbon paste electrode (calyx[6]arene-TiO2/CPE) for the determination of metal Cu²⁺ ion. Calyx[6]arene-TiO2 were synthesized usin...

Bahan anti jamur busuk buah kakao berbasis suspensi TiO2 telah disosialisasikan dan diaplikasikan pada lahan perkebunan kakao Kelompok Tani Mekohia, desa Lebo Jaya-Konawe Selatan. Sosialisasi dan aplikasi bahan anti jamur dilakukan melalui program pengabdian berbasis masyarakat. Pemilihan kelompok tani Mekohia sebagai mitra didasarkan pada fakta ba...

Many studies have explored the pretreatment of lignocellulosic biomass based on oil palm empty fruit bunch (OPEFB) which is categorized as potential biomass waste for bioethanol production. Before proceeding further to obtain bioethanol, several steps such as pretreatment to increase organic constituents are needed. The ionic liquids (ILs) were com...

In this study, a composite material based on Ni–TiO2 Pillared Clay-Montmorillonite (Ni–TiO2/CMMT) was synthesized using the sol–gel method at room temperature and studied its photocatalytic performance under visible light irradiation for dye removal of Orange Reactive 84 (RO 84). The photocatalytic parameters studied were the effect of pH, contact...

Research on the transformation of Oil Palm Empty Fruit Bunches (OPEFB) through pretreatment process using ionic liquid triethylammonium hydrogen sulphate (IL [TEA][HSO 4 ]) was completed. The stages of the transformation process carried out were the synthesis of IL with the one-spot method, optimization of IL composition and pretreatment temperatur...

FeTiO 3 doped TiO 2 /Ti eletrode synthesized through a sol-gel and dip-coating methods for Reactive Green 19 (RG-19) degradation under UV-Visible irradiation. The electrode was characterized by Scanning Electron Microscope (SEM), Linear Sweep Voltammetry (LSV), and Multi Pulse Amperometry (MPA). The electrodesurface show that a FeTiO 3 layer is qui...

This study reports the processing and separation of gum rosin from pine gum (Pinusmerkusii). The research method was carried out with several stages, namely the process of tapping pine gum, the process of separation and purification. After the refining process, the gum rosin and turpentine oil are separated using a simple distillation technique. Th...

Preparation of TiO 2 /Ti and Mn-TiO 2 /Ti electrodes was successfully carried out. The purpose of this study was to effect the addition of manganese (Mn) to TiO 2 which will be used to degrade congo red organic compounds by photocatalysis. TiO 2 is made through an anodic oxidation process. Mn coating is done by doping using the electrodeposition me...

Decomposition of lignin compounds into monomers from oil palm empty fruit bunches (OPEFB)has been successfully carried out. The purpose of this study was to determine the use of ilmenite as a lignin decomposerof OPEFB and to analyze the compounds produced using GC-MS method. The stages of the study consisted of preparation of ilmenite, pretreatment...

The past few decades Dye-Sensitized Solar Cells (DSSC) based on TiO 2 nanoparticle have attracted much attention from researchers because of their promising Physico-chemical properties and high photoconversion efficiency. In this research, TiO 2 nanoparticles mediated with hexamethylenetetramine surfactant were successfully synthesized by the hydro...

The design of the Chemical Oxygen Demand (COD) flow system using TiO 2 /Ti and N-TiO 2 /Ti electrodes has been carried out. TiO 2 /Ti electrodes were synthesized from the anodizing process followed by the sol-gel method as nitrogen doping (N) to obtain N-TiO 2 /Ti electrodes. The test results obtained that TiO 2 /Ti electrodes are only active in UV...

Preparation of Cu-doped TiO 2 nanoparticles (Cu/TiO 2 ) as antifungal Phytophthorapalmivorahas been carried out. In this study, we did a synthesis of Cu/TiO 2 nanoparticles by the sol-gel method and determine the performance of the modification of Cu/TiO 2 nanoparticles as antifungal agents P. palmivora . The stages of this research include synthes...

Studies on the synthesis of TiO 2 /Ti doped Se electrode to degrade reactive orange 84 (RO 84) compounds under UV-Visible irradiation have been successfully carried out. The research objective is to obtain the Se-TiO 2 /Ti electrodes and test performance in degrading RO 84 under irradiation of UV-Visible light by photoelectrochatalytic. Se-TiO 2 /T...

Cu-TiO 2 doped Ti thin layer was prepared by anodizing and electrodeposition. Characterization electrode using Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX) and activity test using Linear Sweep Voltammetry (LSV) under UV and visible light to degrade methylene orange. The result of electrode surface characterization using EDX showed...

Fabrication of FeTiO 3 -TiO 2 /Ti composite electrodes has been successfully carried out by the hydrothermal method and dip coating. The purpose of this study was to determine the effect of the addition of Ilmenite (FeTiO 3 ) on TiO 2 /Ti plates which will be applied to degrade Reactive Red 141 by photoelectrocatalytic. The characterization results...

The objective of this study was to obtain optimization results from the biological hydrolysis of Oil Palm Empty Fruit Bunches (OPEFB) using Aspergillus niger (A. niger) BIOTROP 2173 isolated from grain. Optimized hydrolysis parameters include temperature, pH and time. The hydrolysis process was carried out by growing A. niger on OPEFB powder (± 30...

In the last decade, lichen has become a research interest related to exploring secondary metabolites compounds. Lichen is a unique organism and contains specific chemical compounds rarely found in other natural sources; one species is the lichen Teloschistes flavicans. The objective study explores the toxicity effects and antioxidants activity prop...

The unique secondary metabolites from the lichen organism have been utilized as a raw material for producing natural medicine, which is very useful as an antioxidant (AO) agent. As we know, it also varies greatly depending on the surrounding environment. In this study, we explore the secondary metabolites from the lichen organism genus Usnea sp. or...

The TiO 2 /Ti and S-TiO 2 /Ti electrodes are effectively prepared using the anodizing process. The objective of this analysis is to determine the characteristics of the S-TiO 2 /Ti electrode and its efficiency as a photoelectrocatalytic sensor device. The composite electrode of S-TiO 2 /Ti was prepared using the Ti plate anodizing method in glycero...

Exploration of lichen natural compounds has attracted a lot of attention from researchers as potential medicinal raw materials because chemical compounds contained in lichen have many properties. The potential for developing secondary metabolite compounds of lichen has become a trend for various benefits, for example, in cosmetics, agriculture, hea...

Electrochemical studies in detecting persistent organic pollutants (POPs) have attracted a lot of interest from researchers, especially the carbon paste electrode (CPE). The research objectives were to determine the electrochemical characteristics of TiO 2 /Ag-Li on the CPE in the system Fe ²⁺ /Fe ³⁺ and determine the fipronil in solution. TiO 2 /A...

The second generation of bioethanol has been developed by utilizing the residual products of crops such as oil palm empty fruit bunches (OPEFB). In this study, the OPEFB was carried out synergistically by applying two methods, namely hydrothermal and alkaline. This pretreatment is intended to improve the ability of the OPEFB delignification process...

In recent years, various studies have been utilized lignocellulosic biomass from oil palm empty fruit bunches (OPEFB) to be converted into bioethanol fuels. In this study, we present the techno-economical preparation for biomass pretreatment based on triethylamine hydrogen sulfate ([TEA][HSO4]) ionic liquid. Synthesis, pretreatment, and recovery of...

The preparation of clay-TiO2-S composite as adsorption-degradation material has been carried out. Clay-TiO2-S composite is obtained by mixing clay with TiO2 powder doped S for the pillarization method. Clay characterization was performed using SEM and FTIR. The characterization results showed that there were differences in the pore of the clay befo...

The new composite material Al(III)-TiO2 has been synthesized and applied as a modifier of graphene paste electrode for the determination of fipronil pesticide by cyclic voltammetry. The methods were to synthesis of Aluminum-Titanium dioxide (AT), preparation of graphene paste electrode with mass varied Al(III)-TiO2 (GAT) (0.05 g, 0.1 g, 0.2 g), and...

The role of anatase TiO⁠2 in the performance of carbon paste electrodes (CPE) electrochemical sensors for detection of cypermethrin pesticide has been investigated. It was found that the anatase TiO⁠2-CPE nanocomposites electrode exhibits excellent sensitivity towards the cypermethrin and its sensing sensitivity increases with the increasing of ana...

Studies on organic dyes profile were performed by using TiO2/Ti electrode photoelectrochemical system. The TiO2/Ti electrode was prepared by an anodizing technique. These photoelectrochemical profiles of metanil yellow and remazol red B organic dyes were investigated by Linear Sweep Voltammetry (LSV), Cyclic Voltammetry (CV), Chronoamperometry (CA)...