Copper-doped hematite (Cu-doped α-Fe2O3) nanoparticles have been synthesized by the impregnation method using iron ore as the hematite source. The structural and morphological properties of the prepared samples were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), and nitrogen adsorption-desorption. The XRD results showed that the hematite extracted from iron ore was in the hematite phase. The average crystallite size of copper-doped hematite was slightly smaller than that of hematite. The copper-doped hematite nanoparticles exhibited high photocatalytic activity on degradation of indigo carmine (IC) dye with the degradation percentage of 98.21 % and 99.78%, respectively under UV and solar light irradiation. The highest photocatalytic activity was obtained at the experimental condition namely initial pH of IC solution 1.0, photocatalyst mass of 400 mg, initial concentration dye solution of 15 mg/L, and 90 minutes of irradiation times. The copper-doped hematite nanoparticles could also remove dyes found in batik wastewater with a percentage of the degradation up to 77.56 % and 97.83% under UV and solar light irradiation, respectively.
This study aims to determine the validity of the development of android-based learning media on colloid system material for Class XI IPA MAN 4 Banjar, and to determine student responses to the development of android-based learning media on colloid system material for Class XI IPA MAN 4 Banjar. The type of research used in this research is Research and Development (R & D). The development model used in this study is the ADDIE model, namely the research stages of Analysis, Design, Development and Product Manufacturing, Implementation, and Evaluation. However, in this study the evaluation stage was not carried out. The subjects of this study were students of Class XI Science at MAN 4 Banjar in the 2021/2022 academic year. The learning media developed were based on the results of the assessment of media experts, material experts, subject teachers and students' responses to the development of android-based learning media. The results of this study show the following: the validity level of android-based learning media products on colloidal system material gets a validity level percentage of 79% with a valid category, media experts' assessments get a validity level percentage of 95% with a very valid category, assessment from subject teachers Chemistry class XI MAN 4 Banjar gets a percentage of 85% in the valid category, and students' responses to Android-based learning media for field trials get an assessment percentage of 89% in the very practical category.
Abstrak - Limbah cair yang mengandung Cr(III) dan Na secara bersamaan sering dijumpai pada hasil kegiatan industri, terutama industri penyamakan kulit. Cr(III) yang merupakan logam berbahaya harus dapat dihilangkan dari limbah cair tersebut. Salah satu metode yang efektif digunakan untuk menangani pencemaran Cr(III) dalam limbah cair adalah pertukaran ion menggunakan resin penukar ion. Prinsip metode ini, yaitu menukarkan ion yang tersedia pada resin penukar ion dengan ion-ion yang berada di sekitarnya. Kehadiran Na dalam larutan tempat dijerapnya Cr(III) dengan menggunakan Amberlite IR-120 H, membuat fenomena ini tergolong sebagai penjerapan multikomponen. Dalam hal ini, penjerapan Cr(III) dan Na oleh Amberlite IR-120 H terjadi secara bersama-sama (simultan). Penelitian ini bertujuan untuk mempelajari laju penjerapan simultan yang terjadi pada berbagai suhu. Di samping itu, ingin dikembangkan model matematis untuk mendekati kinetika penjerapan simultan yang ada. Hasil penelitian menunjukkan bahwa semakin tinggi suhu, maka akan semakin besar laju penjerapan simultan Cr(III) dan Na. Kecenderungan yang sama ditunjukkan oleh nilai konstanta kinetika yang semakin besar seiring meningkatnya suhu. Model matematis yang disusun berdasarkan persamaan laju reaksi cukup sesuai untuk mendekati kinetika penjerapan simultan ini. Berdasarkan nilai energi aktivasi sebesar 56,735 kJ/mol untuk penjerapan Cr(III) yang terjadi, maka dapat dikatakan bahwa laju reaksi adalah laju yang mengontrol proses.Kata kunci: Kromium(III), penjerapan, kinetika, Amberlite IR-120 H, simultan
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