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All Journal Logista: Jurnal Ilmiah Pengabdian Kepada Masyarakat Risalah Fisika Jurnal Ilmiah Berkala: Sains dan Terapan Kimia
Widya Krestina, Luqman Hakim, Dyah Ayu Pramoda Wardani,
Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Palangka Raya, Jalan Yos Sudarso, Palangka Raya, Kalimantan Tengah
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Physics Other

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Journal : Jurnal Ilmiah Berkala: Sains dan Terapan Kimia

 1 
INVESTIGASI SIFAT MAGNET DAN LUAS PERMUKAAN BENTONIT TERMAGNETISASI SEBAGAI ADSORBEN CEPAT PISAH Dyah Ayu Pramoda Wardani; Akhmad Damsyik; Karelius Karelius; Suyanta Suyanta; Dwi Siswanta
Jurnal Sains dan Terapan Kimia Vol 15, No 2 (2021)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (626.361 KB) | DOI: 10.20527/jstk.v15i2.9726

Abstract

Bentonit merupakan material alam yang memiliki kecenderungan yang tinggi membentuk koloid, ukuran partikelnya yang dapat membesar sampai beberapa kali lipat jika terkontak dengan air dan membentuk suspensi, akan menimbulkan kesulitan dalam proses pemisahannya dari fasa cair setelah proses adsorpsi. Salah satu upaya untuk mengatasi kelemahan tersebut ialah dengan melakukan modifikasi bentonit menggunakan magnetit (Fe3O4), yang akan mengakibatkan adanya sifat kemagnetan pada material tersebut. Sifat kemagnetan ini diharapkan memudahkan pemisahan partikel–partikel bentonit termodifikasi setelah proses adsorpsi dapat dilakukan dengan mudah dan cepat menggunakan medan magnet eksternal. Dalam studi ini dikaji sifat kemagnetan bentonit termagnetisasi menggunakan instrumen VSM (Vibrating Sample Magnetometer) dan dikaji luas permukaan bentonit teraktivasi dan bentonit termagnetisasi menggunakan SSA (Surface Sorption Analyzer) berdasarkan persamaan BET.Hasil penelitian menunjukkan bahwa analisis VSM memberikan nilai Ms pada Fe3O4 murni lebih besar (64 emu/g) dibandingkan bentonit termagnetisasi (11 emu/g). Berdasarkan data analisis SSA diperoleh bahwa sampel bentonit termagnetisasi memiliki luas permukaan spesifik yang lebih kecil bila dibandingkan dengan bentonit teraktivasi, yaitu masing-masing sebesar 222 dan 138 m2/g.
Study of Microstructure and Optical Properties of Fe2O3/TiO2 Composites as Functional Materials Rendy Muhamad Iqbal; Erwin Prasetya Toepak; Dyah Ayu Pramoda Wardani; Elda Alyatikah; Stevin Carolius Angga; Luqman Hakim
Jurnal Sains dan Terapan Kimia Vol 16, No 2 (2022)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v16i2.12142

Abstract

 Semiconductors have conductivity levels between insulators and conductors which can be applied in various fields such as photocatalytic, adsorption, and Dye Sensitizer Solar Cell (DSSC). However, some semiconductors are only active under ultraviolet light, therefore to improve their utilization, modifications are made by producing a hybrid combination of two or more materials or dopping materials. This study aims to obtain a semiconductor material with a low band gap energy from the Fe2O3/TiO2 composite material. Fe2O3/TiO2 composites were synthesized by the solid-state method and characterized by XRD, SEM-EDX, and UV-Vis. The characterization using XRD showed the peak intensity of TiO2 and Fe2O3. The morphology of the material obtained using SEM-EDX showed an even distribution of particle size, as well as the distribution of Ti, Fe, and O elements. The optical properties of the composite showed strong absorbance in the UV region for higher TiO2 compositions. On the other hand, composite materials with a higher Fe2O3 composition showed stronger absorbance in the visible light region.
Utilization of Ferrate Ion (FeO42-) as Oxidizing Agent for Reducing Color Intensity of Peat Water Retno Agnestisia; Karelius Karelius; Rendy Muhamad Iqbal; Dyah Ayu Pramoda Wardani; Midun Efendi Patar Sihombing; Sri Yulandari Simangunsong; Junita Dongoran
Jurnal Sains dan Terapan Kimia Vol 17, No 2 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i2.14832

Abstract

Peat water from Central Kalimantan is generally yellow to brownish-red in color. It causes peat water to not be used as a source of water for daily needs. Humic acid, fulvic acid, and humin are organic compounds that cause peat water to become colored. One alternative step that can be taken for reducing the color intensity of peat water is to degrade color-causing organic compounds by using an oxidizing agent. A hexavalent form of iron ion (Fe6+), commonly called ferrate (FeO42-) in potassium ferrate compound, is a powerful oxidizing agent used in the present study. Potassium ferrate (K2FeO4) was synthesized by a wet oxidation method and characterized using a UV-Vis spectrophotometer and an X-Ray Diffractometer (XRD). The ferrate solution is purplish-red in color with a maximum wavelength of 510 nm. The XRD pattern shows strong diffraction peaks at 2θ which are characteristic of K2FeO4. The ferrate solution was then used to degrade color-causing organic compounds  in the peat water from Central Kalimantan. Determination of the optimum degradation conditions was monitored by the absorbance decrease of organic compounds in peat water at a wavelength of 370 nm. The results showed that ferrate solution with a concentration of 80 ppm was able to degrade organic compounds in peat water at pH 8, with a  removal efficiency of 100%. Keywords: oxidizing agent, ferrate ion (FeO42-), peat water
Co-Authors Akhmad Damsyik Diah K. Fatmala, Dwi Tyas Setiawan, Ferry Purwanto, Dwi Siswanta Elda Alyatikah Elda Alyatikah Erwin Prasetya Toepak Erwin Prasetya Toepak Iqbal, Rendy Muhamad Junita Dongoran Karelius Karelius Karelius Karelius Kurniawati, Neny Luqman Hakim Midun Efendi Patar Sihombing Rendy Muhamad Iqbal Rendy Muhamad Iqbal Retno Agnestisia Sari Namarito Simamarta Sri Yulandari Simangunsong Stevin Carolius Angga Suyanta Suyanta