Pengaruh Pemanfaatan Karbon Aktif Tulang Ayam (Gallus gallus domesticus) Sebagai Adsorben Kandungan Kromium (Cr) Pada Limbah Cair Sablon Sebagai Sumber Belajar Biologi

Environmental pollution caused by industrial wastewater, particularly containing heavy metals such as chromium (Cr), is a serious issue that requires effective and eco-friendly solutions. This study aims to determine the effectiveness of activated carbon derived from chicken bones (Gallus gallus domesticus) in reducing Cr levels in screen-printing wastewater and its potential as a biology learning resource. The method used was an experimental approach with variations in adsorbent mass (1 g, 5 g, and 10 g) and contact time (10, 30, and 60 minutes). The carbon was chemically activated using HCl and NaOH. Statistical tests (Kolmogorov-Smirnov, Levene Test, and Kruskal-Wallis) showed that the data were normally distributed and homogeneous, but there was no significant difference among treatments. Treatments using 1 g and 5 g of activated carbon reduced Cr levels below the quality threshold (1 mg/L), while the 10 g treatment slightly exceeded the limit. The most effective reduction was observed with 1 g of carbon and 10 minutes of contact time (0.2263 mg/L). This research indicates that chicken bones can be used as a low-cost, eco-friendly adsorbent. Additionally, the findings have potential as contextual biology learning materials for senior high school students, particularly in the topic of environmental change. The results of this study were developed into biology learning media in the form of student worksheets LKS based on the Independent Curriculum, with learning outcomes focused on Environmental Change. This media is expected to raise students' awareness of addressing environmental issues.