Effects of Temperature and Aeration on The Dissolved Oxygen (DO) Values in Freshwater Using Simple Water Bath Reactor: A Brief Report

This work investigated the effect of temperature and aeration treatments on the dissolved oxygen (DO) values in freshwater. The study was carried out using a simple water bath reactor in room temperature condition. Based on the results, freshwater sample without the aeration and temperature treatments (control) indicates a fluctuating profile on which the obtained values of DO were 4.21-4.98 mg/L at Taverage = 27.7 °C. However, the aeration treatment was slightly able to enhance the DO value up to 8.12 mg/L from the initial concentration of 3.88 mg/L at Taverage = 27.4 °C. Compared to the aeration treatment, the addition of temperature treatment has extremely increased the DO value up to 21 mg/L from 6.6 mg/L (T0 minutes = 27 °C)  for 20 minutes of DO observation (T20 minutes = 12.4 °C). Hence, this brief report suggests that the addition of temperature treatment gave a significant effect on the DO value in freshwater than the aeration treatment and control

Effects of Temperature and Aeration on The Dissolved Oxygen (DO) Values in Freshwater Using Simple Water Bath Reactor: A Brief Report

This work investigated the effect of temperature and aeration treatments on the dissolved oxygen (DO) values in freshwater. The study was carried out using a simple water bath reactor in room temperature condition. Based on the results, freshwater sample without the aeration and temperature treatments (control) indicates a fluctuating profile on which the obtained values of DO were 4.21-4.98 mg/L at Taverage = 27.7 °C. However, the aeration treatment was slightly able to enhance the DO value up to 8.12 mg/L from the initial concentration of 3.88 mg/L at Taverage = 27.4 °C. Compared to the aeration treatment, the addition of temperature treatment has extremely increased the DO value up to 21 mg/L from 6.6 mg/L (T0 minutes = 27 °C)  for 20 minutes of DO observation (T20 minutes = 12.4 °C). Hence, this brief report suggests that the addition of temperature treatment gave a significant effect on the DO value in freshwater than the aeration treatment and control

The Starting Material Concentration Dependence of Ag3PO4 Synthesis for Rhodamine B Photodegradation under Visible Light Irradiation

Synthesis of Ag3PO4 photocatalyst under the varied concentrations of AgNO3 and Na2HPO4·12H2O as starting material has been successfully synthesized using the co-precipitation method. The concentration of AgNO3 is 0.1; 0.5; 1.0; and 2.0 M, whereas Na2HPO4·12H2O is 0.03; 0.17; 0.33; and 0.67 M, respectively. The co-precipitations were carried out under aqueous solution. As-synthesized photocatalysts were examined to degrade Rhodamine B (RhB) under blue light irradiation. The results showed that varying concentrations of starting materials affect the photocatalytic activities, the intensity ratio of [110]/[200] facet plane, and their bandgap energies of Ag3PO4 photocatalyst. The highest photocatalytic activity of the sample was obtained by synthesized using the 1.0 M of AgNO3 and 0.33 M of Na2HPO4·12H2O (AP-1.0). This is due to the high [110] facet plane and increased absorption along the visible region of AP-1.0 photocatalyst. Therefore, this result could be a consideration for the improvement of Ag3PO4 photocatalyst

Effect of H2O2 Addition on the Photocatalyst Properties of Ag3PO4 for Methylene Blue Photodegradation

In this work, a facile enhanced property of Ag3PO4 photocatalyst using H2O2 for methylene blue photodegradation has been conducted. Ag3PO4 photocatalyst was synthesized using the co-precipitation method. Then, the photocatalytic activity and stability of Ag3PO4 were tested in the methylene blue degradation under the addition of an H2O2 30% solution. According to the results, the prolonged photocatalysis reaction led to a decrease in the catalysis ability of the Ag3PO4 photocatalyst. Meanwhile, the addition of 5 mL of H2O2 (AH-10% sample) tends to enhance the stability of Ag3PO4 photocatalyst with the dye removal percentage and recycling test were up to 90.3% and three recycle runs, respectively. The low stability of Ag3PO4 might be due to the catalyst photo-corrosion through Ag+ reduction. This research suggests that H2O2 is beneficial to inhibit the photo-corrosion of Ag3PO4 photocatalyst, even though released Ag ions that were caused by the excess addition of H2O2 oxidizing agent should be considered

Effect of H2O2 Addition on the Photocatalyst Properties of Ag3PO4 for Methylene Blue Photodegradation

In this work, a facile enhanced property of Ag3PO4 photocatalyst using H2O2 for methylene blue photodegradation has been conducted. Ag3PO4 photocatalyst was synthesized using the co-precipitation method. Then, the photocatalytic activity and stability of Ag3PO4 were tested in the methylene blue degradation under the addition of an H2O2 30% solution. According to the results, the prolonged photocatalysis reaction led to a decrease in the catalysis ability of the Ag3PO4 photocatalyst. Meanwhile, the addition of 5 mL of H2O2 (AH-10% sample) tends to enhance the stability of Ag3PO4 photocatalyst with the dye removal percentage and recycling test were up to 90.3% and three recycle runs, respectively. The low stability of Ag3PO4 might be due to the catalyst photo-corrosion through Ag+ reduction. This research suggests that H2O2 is beneficial to inhibit the photo-corrosion of Ag3PO4 photocatalyst, even though released Ag ions that were caused by the excess addition of H2O2 oxidizing agent should be considered

The Identification of Electrolyte Property of Humus-Contained Andosol Soil Using Cu-Zn Electrodes

This study investigated the electrolyte property of humus-contained andosol soil using Volta cell. The electrodes that are used were Cu and Zn for cathode and anode, respectively. This research was done by varying electrode area and distance between Cu and Zn electrodes. The varied electrode area was 20, 30, and 40 cm2, whereas the electrode distance was 3, 4, and 5 cm. Then, the current and voltage profiles of Volta cell system were measured using a digital multimeter. The result showed that humus-contained andosol soil has an electrolyte property. Electrolyte property of andosol soil might be due to the humus substance that has a high cationic-exchange capacity. Besides, it showed that the increase of the electrode area, the current and voltage were increased gradually. In contrast, the increase in current and voltage could be found by the decrease of electrode distance. In addition, the use of 24-Volta cells system enhancing current and voltage compared to a single cell. It suggests that the increase of current and voltage was relatively proportional to the number of Volta cell. Therefore, this research can be a reference for the identification of electrolyte property of natural or waste materials

The Identification of Electrolyte Property of Humus-Contained Andosol Soil Using Cu-Zn Electrodes

This study investigated the electrolyte property of humus-contained andosol soil using Volta cell. The electrodes that are used were Cu and Zn for cathode and anode, respectively. This research was done by varying electrode area and distance between Cu and Zn electrodes. The varied electrode area was 20, 30, and 40 cm2, whereas the electrode distance was 3, 4, and 5 cm. Then, the current and voltage profiles of Volta cell system were measured using a digital multimeter. The result showed that humus-contained andosol soil has an electrolyte property. Electrolyte property of andosol soil might be due to the humus substance that has a high cationic-exchange capacity. Besides, it showed that the increase of the electrode area, the current and voltage were increased gradually. In contrast, the increase in current and voltage could be found by the decrease of electrode distance. In addition, the use of 24-Volta cells system enhancing current and voltage compared to a single cell. It suggests that the increase of current and voltage was relatively proportional to the number of Volta cell. Therefore, this research can be a reference for the identification of electrolyte property of natural or waste materials

The Study of Pineapple Peel (Ananas comosus L.) Waste Based-Electrolyte Medium: A Simple Experiment Design for the Students

To promote the student curiosity and understanding in the electrolyte medium was carried out using home-made Volta cell. The electrode materials were iron and carbon for anode (-) and cathode (+), respectively. The experiment was designed by two models that were single-chamber (SC) and three series-packed chambers (3-SCs), respectively. Electrolyte properties could be investigated in pineapple peel (Ananas comosus L.)-based electrolyte medium during the operating time of 8 hours, respectively. The measured-voltage of 2.63 and 2.60 of the 3-SCs system could turn on the LED lamp. However, in this study, the decrease of voltage and current were due to the oxidation process of the pineapple peel-based medium under air, room temperature, and normal pressure during the long-operating time of the experiment. Finally, this research expected to provide additional valuable experience and knowledge as same as to facilitate in information delivering to the students in understanding the electrolyte medium from the waste or natural sources

ASPEK GRAMATIKAL DAN LEKSIKAL PADA WACANA ”TAJUK RENCANA” SURAT KABAR KOMPAS

Indro Febiyanto. C0201043. 2009. Aspek Gramatikal dan Leksikal pada Wacana ”Tajuk Rencana” Surat Kabar Kompas. Skripsi: Jurusan Sastra Indonesia Fakultas Sastra dan Seni Rupa Universitas Sebelas Maret Surakarta. Permasalahan yang dibahas dalam penelitian ini, yaitu: (1) Bagaimana penggunaan aspek gramatikal yang terdapat pada wacana “Tajuk Rencana” surat kabar Kompas? (2) Bagaimana penggunaan aspek leksikal yang terdapat pada wacana Tajuk Rencana surat kabar Kompas? (3) Seberapa banyak frekuensi pemakaian setiap aspek gramatikal dan leksikal yang terdapat pada wacana kolom “Tajuk Rencana” surat kabar Kompas? Tujuan penelitian ini ialah (1) Mendeskripsikan aspek gramatikal pada wacana “Tajuk Rencana” surat kabar Kompas. (2) Mendeskripsikan aspek leksikal pada wacana “Tajuk Rencana” surat kabar Kompas (3) Menunjukkan frekuensi tipe aspek gramatikal dan aspek leksikal yang terdapat pada wacana “Tajuk Rencana” pada surat kabar Kompas. Penelitian ini merupakan penelitian kualitatif. Dengan demikian, penelitian ini juga akan menggunakan metode kualitatif. Pada penelitian ini juga, yang dijadikan sumber data adalah wacana “Tajuk Rencana” pada surat kabar Kompas. Dalam penelitian ini teknik analisis yang digunakan adalah teknik analisis distribusional. Berdasarkan hasil analisis dapat disimpulkan bahwa wacana “Tajuk Rencana” pada surat kabar Kompas terjalin dengan adanya aspek gramatikal dan leksikal. Sehingga makna yang dihasilkan dari perpaduan tersebut dapat dipahami oleh pembaca. Aspek gramatikal terdiri atas pengacuan referensi, penyulihan (substitusi), pelesapan (elipsis), perangkaian (konjungsi). Aspek leksikal terdiri atas repetisi (pengulangan,) sinonimi (padan kata), antonimi (lawan kata), hiponimi (hubungan atas-bawah). Dalam penelitian ini ditunjukkan sejumlah aspek gramatikal dan leksikal yang menghubungkan kalimat- kalimat dalam sejumlah tabel

The Study of Pineapple Peel (Ananas comosus L.) Waste Based-Electrolyte Medium: A Simple Experiment Design for the Students

To promote the student curiosity and understanding in the electrolyte medium was carried out using home-made Volta cell. The electrode materials were iron and carbon for anode (-) and cathode (+), respectively. The experiment was designed by two models that were single-chamber (SC) and three series-packed chambers (3-SCs), respectively. Electrolyte properties could be investigated in pineapple peel (Ananas comosus L.)-based electrolyte medium during the operating time of 8 hours, respectively. The measured-voltage of 2.63 and 2.60 of the 3-SCs system could turn on the LED lamp. However, in this study, the decrease of voltage and current were due to the oxidation process of the pineapple peel-based medium under air, room temperature, and normal pressure during the long-operating time of the experiment. Finally, this research expected to provide additional valuable experience and knowledge as same as to facilitate in information delivering to the students in understanding the electrolyte medium from the waste or natural sources