-Synthetic dye wastewater from textile industries is characterized by strong color, high temperature, variable pH and high chemical oxygen demand (COD). The strong color of wastewater affects aesthetic and water transparency of water bodies. One of method that has advantages in term of simplicity to remove synthetic dyes is adsorption. Two different biomaterial wastes of rice straw and palm oil midrib were used in this study to develop activated carbon adsorbents. These adsorbents were applied for the removal of Naphtol AS-G dye in aqueous solution. The effects of solution pH, adsorbents masses and contact time on dye adsorption were evaluated based on batch experiments. Removal of dye can be achieved within 60 minutes at a wide pH range starting from 4 to 8. At lower pH, synthetic dye removal was decreasing probably due to protonation of adsorbent's active sites. The adsorption isotherms based on Langmuir and Freundlich models were analyzed. The isotherms analysis indicated that the adsorption by rice straw and palm oil can be represented by Langmuir and Freundlich isotherm model, respectively. Adsorption isotherms of Naphtol AS-G onto activated carbon are favorable with high adsorption capacity for both biomaterials. The mechanisms of color removal by activated carbon involved chemical and physical adsorption, in accordance with both the Langmuir and Freundlich models. The calculated maximum dye adsorption capacities onto rice straw and palm oil midrib activated carbon were 55.86 and 69.44 mg/g, respectively. Adsorption using biomass-based activated carbon offers a good technique for textile wastewater treatment as it could remove up to 95% of the color intensity besides reducing other pollutants such as COD, nitrate and phosphate.
Penelitian ini bertujuan untuk mengetahui tingkat kelayakan, respon mahasiswa dan peningkatan hasil belajar mahasiswa setelah menggunakan media berbasis android yang dikembangkan menggunakan Lectora Inspire pada materi Termodinamika Pembentukan Senyawa Anorganik dan Ikatan Kimia di mata kuliah Kimia Anorganik II. Pengembangan media menggunakan model pengembangan 4D. Penelitian dilakukan dengan subjek penelitian yaitu mahasiswa Program Studi Pendidikan Kimia Universitas Bengkulu kelas A dan kelas B yang berjumlah 45 orang. Instrumen pada penelitian ini lembar validasi, angket respon mahasiswa, lembar pretest dan posttest. Dari hasil penelitian diperoleh (1) media yang dikembangkan menggunakan Lectora Inspire dinyatakan sangat layak oleh ahli media dan materi dengan persentase 89.8% dan 90.5%, (2) respon mahasiswa terhadap media pembelajaran yang dikembangkan menggunakan Lectora Inspire berada pada kategori sangat baik dengan persentase rata-rata sebesar 88,8%, (3) terjadi peningkatan hasil belajar yang diukur dengan rata-rata skor N-gain 0,64 pada kriteria sedang. Hasil penelitian ini menunjukkan bahwa media pembelajaran berbasis android yang dikembangkan menggunakan Lectora Inspire layak untuk digunakan sebagai media dalam pembelajaran untuk membantu mahasiswa dalam memahami materi pada mata kuliah Kimia Anorganik II.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.