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The Effect of Couple Doping Gd and Co on The Physical Characteristics of LaFeO3 Thick Film for Acetone Gas Sensor Application Haryadi, Hendi; Syarif, Dani Gustaman; Suhendi, Endi
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 12 No. 2 (2022)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v12n2.p115-126

Abstract

The acetone gas sensor is one type of sensor being researched for its application because it detects the presence of diabetes in sufferers. Gas sensors with high sensitivity and low operating temperature have been extensively investigated for this purpose, and this research is focused on the same purpose. Synthetization and characterization of LaFeO3 with co-doping Gd2O3 and CoO thick film ceramics for acetone gas sensor was conducted. LaFeO3 was made using the co-precipitation method with 2.5% CoO for each and 0%, 2.5%, and 5% Gd2O3 variation to the LaFeO3. The LaFeO3 thick film was prepared using the screen-printing technique and calcined at 800°C for two hours. The analysis of crystal structure characterization using X-Ray Diffraction (XRD) resulted in LaFeO3 with co-doping Gd2O3 and CoO thick film ceramics having the same cubic crystal phase with smaller lattice parameters and crystallite sizes after doping were added. The results of morphology structure characterization using Scanning Electron Microscopy (SEM) showed the grain size of the LaFeO3 with co-doping 2.5% CoO and 0%, 2.5%, and 5% Gd2O3 samples to support the analysis of electric property characterization later on. The electric property characterization showed that LaFeO3 with various Gd2O3 concentrations, as part of co-doping with 2.5% CoO, resulted in higher sensitivity compared to the lacking of Gd2O3 one. In order, the maximum sensitivity values of each Gd2O3 concentration are 2.74, 3.06, and 8.76 when exposed to 270 ppm acetone gas at 310°C. Gd2O3, as part of co-doping in LaFeO3 with CoO 2.5%, has successfully increased the sensitivity to the gas sensor yet still can not meet the expectation towards the operating temperature, which is still high compared to other references.
Aktivasi Zirkonium Silikat (Zrsio4) Untuk Adsorben Pendegradasi Metilen Biru Dengan Metode Aktivasi Termal Jenatu, Yolanda Maryani; Abrar, Abrar; Syarif, Dani Gustaman
eProceedings of Engineering Vol. 10 No. 6 (2023): Desember 2023
Publisher : eProceedings of Engineering

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Abstract

Dari penelitian yang telah dilakukan diperoleh luas permukaan zirkonium silikat (ZrSiO4) sebesar 10.365 m2 /g, dengan ukuran partikel (D) sebesar 126.945 nm. Zirkonium silikat (ZrSiO4) memiliki struktur kristal tetragonal dengan ukuran kristal untuk temperatur 700oC, 600oC, dan 500oC berturut-turut adalah sebesar 50.9369 nm, 47.5481 nm, dan 52.8192 nm. Berdasarkan nilai korelasi (R2 ) analisis isoterm Langmuir lebih mendekati data eksperimen dibandingkan dengan isoterm Freundlich dengan nilai korelasi (R2 )sebesar 0.8176 yang menunjukkan bahwa proses adsorpsi lebih didominasi oleh penyerapan monolayer, dengan nilai kapasitas adsorpsi maksimum (qm) sebesar 19.763 mg/g. Kinetika adsorpsi yang terjadi mengikuti model kinetika orde 2 dengan nilai korelasi (R2 ) yang paling mendekati 1 dan konstanta laju reaksi terbesar terjadi pada konsentrasi 5ppm sebesar (k2) 0.6668 menit-1 .Kata kunci— aktivasi, zirkonium silika (ZrSiO4), adsorpsi, XRD, Surface Area Meter
EVALUATION OF MINERAL-BASED HYDROXYAPATITE/ZnO COMPOSITES AS PHOTOCATALISTS FOR METHYLEN BLUE DEGRADATION Hardian, Arie; Nafisah, Aulia Zakiyatun; Karya, Teguh; Halim, Riyan; Murniati, Anceu; Syarif, Dani Gustaman; Noviyanti, Atiek Rostika; Nurhayati, Mita; Jasmansyah, Jasmansyah; Reza, Muhammad
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol. 11 No. 2 (2024): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v11i2.37886

Abstract

The use of dyes in the textile industry has increased significantly, raising concerns about their potential to pollute the environment and harm human health. Methylene blue is a widely used synthetic dye, necessitating effective methods for its degradation. Photodegradation is a promising approach to decompose dyes into simpler, less harmful compounds. In this study, hydroxyapatite combined with ZnO was employed as a photocatalyst material to enhance photocatalytic performance. The research aims to degrade methylene blue using a Hydroxyapatite/ZnO (HAp/ZnO) nanocomposite through photodegradation. The optimization of the photodegradation process was investigated by varying irradiation time, methylene blue concentration, and pH. The optimum degradation of methylene blue was achieved using 20 mg of HAp/ZnO nanocomposite at an irradiation time of 120 minutes, an initial methylene blue concentration of 5 ppm, and pH 7. Adsorption isotherm modeling revealed that the process followed the Langmuir isotherm model, with a maximum adsorption capacity (qmax) of 0.3353 mg/g. The degradation followed pseudo-second-order kinetics with a reaction rate constant of 4.0026×105 L/mol·s.
Co-Authors - Wiendartun A. Suhandi A.A. Ketut Agung Cahyawan W Abrar Abrar Ahmad Aminudin Anceu Murniati Aria Respati, Aria Arie Hardian Atiek Rostika Noviyanti Dwi Harjono E. Suhendi Halim, Riyan Haryadi, Hendi Jaenudin Kamal, Jaenudin Jasmansyah, Jasmansyah Jenatu, Yolanda Maryani Jovi Kusuma Dilaga, Jovi Kusuma Karya, Teguh Lutfi Firmansyah, Lutfi Muhammad Reza Nafisah, Aulia Zakiyatun Nanda Dwimar Hakim Nur Tursina Nurhayati, Mita Puspita Sari Sanusi Sanusi Soni Setiadji Tety Sudiarti