Electronic Theses and Dissertation

Residu tetrasiklin merupakan salah satu jenis limbah yang paling sering terkontaminasi diperairan yang dapat memberi banyak dampak negatif terhadap ekosistem perairan. Silika menjadi salah satu bahan penjerap yang dapat digunakan untuk mengurangi konsentrasi tetrasiklin diperairan, namun tidak dapat menguraikan tetrasiklin yang telah dijerap. Untuk itu, silika dikombinasi dengan magnetit agar dapat mendegradasi tetrasiklin yang telah dijerap melalui kombinasi proses adsorpsi dan Fenton-like. Penelitian ini bertujuan untuk mengarakterisasi dan mengetahui kemampuan silika termodifikasi magnetit dalam menjerap dan mendegradasi tetrasiklin. Komposit silika-magnetit dikarakterisasi menggunakan Fourir Transform Infrared (FT-IR) Spectroscopy, X-ray Diffraction (XRD), dan analisis Scanning Electron miscroscope (SEM). Jumlah silika, magnetit dan komposit yang berhasil diperoleh masing-masing adalah sebesar 14,64 g; 10,40 g; dan 11,57 g. Terbentuknya komposit ditandai dengan adanya perubahan-perubahan yang spesifik pada hasil FTIR, XRD dan SEM. Komposit diuji kemampuan dalam menjerap tetrasiklin menggunakan beberapa parameter (konsentrasi tetrasiklin, bobot komposit, dan pH tetrasiklin) untuk menemukan kondisi terbaik penjerapannya dan dilanjutkan dengan degradasi tetrasiklin melalui proses Fenton-like. Hasil menunjukkan bahwa komposit mampu menjerap tetrasiklin pada kondisi optimum (konsentrasi tetrasiklin 50 ppm, bobot adsorben 0,02 g dan pH 2) dengan nilai kapasitas adsorpsi sebesar 22,88 mg/g. Proses adsorpsi tetrasiklin terjadi secara fisika yang ditandai dengan tinggi nilai korelasi pada model Freundlich (R2 = 0,8064) dibandingkan dengan model Langmuir (R2 = 0,5874). Hasil kombinasi adsorpsi dan degradasi melalui proses Fenton-like menunjukkan bahwa terjadi peningkatkan penghilangan konsentrasi tetrasiklin dari 34,82% menjadi 80,12%. Sebagai kesimpulan, kombinasi metode adsorpsi dan degradasi melalui proses Fenton-like mampu meningkatkan penghilangan konsentrasi tetrasiklin secara signifikan.

Kata Kunci: Adsorpsi, degradasi, Fenton-like, komposit, tetrasiklin

Tetracycline residue is one of the most common types of waste contaminated with water that can have many negative impacts on aquatic ecosystems. Silica is one of the sorbents that can be used to reduce the concentration of tetracycline in the water, but it cannot degrade the tetracycline that has been absorbed. Therefore, silica was combined with magnetite in order to degrade tetracycline that has been adsorbed through a combination of adsorption and Fenton-like processes. This study aims to characterize and determine the ability of magnetite-modified silica to adsorb and degrade tetracycline. The silica-magnetite composite was characterized using Fourier Transform Infrared (FT-IR) Spectroscopy, X-ray Diffraction (XRD), and Scanning Electron miscroscope (SEM) analysis. The amount of silica, magnetite and composites successfully obtained were 14.64 g; 10.40 g; and 11.57 g, respectively. The formation of the composite is characterized by specific changes in the results of FTIR, XRD and SEM. The composites were tested for their ability to sorb tetracycline using several parameters (tetracycline concentration, composite weight, and tetracycline pH) to find the best sorption conditions and continued with tetracycline degradation through a Fenton-like process. The results showed that the composite was able to adsorb tetracycline at optimum conditions (tetracycline concentration of 50 ppm, adsorbent weight of 0.02 g and pH 2) with an adsorption capacity value of 22.88 mg/g. Tetracycline adsorption process occurs physically characterized by high correlation value in Freundlich model (R2 = 0.8064) compared to Langmuir model (R2 = 0.5874). The results of the combination of adsorption and degradation through the Fenton-like process showed that there was an increase in tetracycline concentration removal from 34.82% to 80.12%. In conclusion, the combination of adsorption and degradation method through Fenton-like process was able to increase the removal of tetracycline concentration significantly. Keywords: Adsorption, composite, degradation, Fenton-like, tetracycline