Electronic Theses and Dissertation

Aulia andini. 2025. pencemaran lingkungan oleh logam berat, terutama nikel, telah menjadi masalah global yang semakin mengkhawatirkan. akumulasi logam nikel yang berkelanjutan dapat menyebabkan berbagai masalah kesehatan pada tubuh manusia, seperti gangguan imun, saraf, pertumbuhan, penyakit pada sistem reproduksi, kanker, hingga kematian. penelitian terkait komposit kitosan yang diimmobilisasi pada butiran kaca (white silica beads) untuk adsorpsi ion nikel terlarut telah dilakukan. penelitian ini bertujuan untuk mengetahui kemampuan adsorben kitosan butiran kaca dalam mengadsorpsi ion nikel terlarut. asorben kitosan butiran kaca mengalami pembengkakan pada permukaan kitosan setelah di uji ketahanan dalam h2o selama 5 jam. metode adsorpsi merupakan salah satu cara yang efektif untuk meminimalisir logam berat. spektrofotometri uv-vis digunakan untuk melihat proses adsorpsi ion ni oleh adsorben kitosan butiran kaca, dikarakterisasi menggunakan ftir, sem, dan aas. hasil penelitian menunjukkan bahwa adsorben kitosan butiran kaca mengadsorpsi ion ni dalam waktu 20 menit sebanyak 1010 mg/l dengan efisiensi 46,02%. kapasitas adsorpsi terbesar ditunjukkan pada massa adsorben 400 butir dengan berat 14,127 gram. uji kolom menunjukkan bahwa konsentrasi ion ni yang terserap sebanyak 350 mg/l dengan efisiensi 16,24%. hasil regenerasi adsorben menunjukkan proses penyerapan mengalami penurunan menjadi 2,42%, artinya kondisi adsorben masih dalam keadaan jenuh. hasil adsorpsi meningkat dengan penambahan waktu kontak dan massa adsorben, namun mengalami penurunan kapasitas adsorpsi apabila sudah mencapai kondisi optimum. penelitian ini mengikuti tipe isoterm langmuir dengan persamaan y = 0,8086x-944,5 dan koefisien determinasi (r²) = 0,9554. kata kunci: logam berat, nikel, kitosan butiran kaca, spektrofotometri uv- vis, ftir, sem, aas, proses adsorpsi, isoterm langmuir

Aulia Andini. 2025. Environmental pollution by heavy metals, especially nickel, has become an increasingly worrying global problem. Continuous accumulation of nickel metal can cause various health problems in the human body, such as immune disorders, nervous disorders, growth disorders, diseases of the reproductive system, cancer, and even death. Research related to Chitosan Composites Immobilized on White Silica Beads for Adsorption of Dissolved Nickel Ions has been conducted. This study aims to determine the ability of white silica beads chitosan adsorbent in adsorbing dissolved nickel ions. The white silica beads chitosan adsorbent experienced swelling on the chitosan surface after being tested for durability in H2O for 5 hours. The adsorption method is one of the effective ways to minimize heavy metals. UV-Vis spectrophotometry was used to observe the adsorption process of Ni ions by white silica beads chitosan adsorbent, characterized using FTIR, SEM, and AAS. The results showed that the white silica beads chitosan adsorbent adsorbed Ni ions within 20 minutes as much as 1010 mg/L with an efficiency of 46.02%. The highest adsorption capacity was demonstrated by the adsorbent mass of 400 granules weighing 14.127 grams. Column tests showed that the adsorbed Ni ion concentration was 350 mg/L with an efficiency of 16.24%. Adsorbent regeneration results showed a decrease in the adsorption process to 2.42%, indicating that the adsorbent was still saturated. Adsorption yield increased with increasing contact time and adsorbent mass, and adsorption capacity decreased when optimum conditions were reached. This study followed the Langmuir isotherm model with the equation y = 0.8086x-944.5 and a coefficient of determination (R²) = 0.9554. Keywords: Heavy Metals, Chitosan White Silica Beads, UV-VIS Spectrophotometry, FTIR, SEM, AAS, Adsorption Process, Langmuir Isotherm