Electronic Theses and Dissertation

Penelitian ini bertujuan untuk mengkaji karakteristik dan efektivitas kalsium oksida (CaO) yang disintesis dari limbah cangkang kerang darah (Anadara granosa) sebagai penjerap dan pendegradasi Malachite Green. Cangkang kerang darah dikalsinasi pada suhu 900°C selama 3 jam, kemudian dikarakterisasi menggunakan Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), dan Brunauer–Emmett–Teller (BET). Hasil karakterisasi FTIR menunjukkan terbentuknya ikatan Ca–O pada bilangan gelombang 420 cm⁻¹ yang mengindikasikan konversi CaCO₃ menjadi CaO. Analisis SEM memperlihatkan morfologi permukaan granular dan berpori, sedangkan XRD mengonfirmasi terbentuknya fase kristal CaO. Analisis XRF menunjukkan kandungan CaO sebesar 98,99%, sementara BET menunjukkan luas permukaan spesifik 1,9310 m²/g dengan diameter pori rata-rata 6,31 nm yang termasuk kategori mesopori. Uji adsorpsi dan fotodegradasi menunjukkan bobot 0,05 g dengan nilai persentase penghilangan Malachite Green tertinggi masing-masing sebesar 97,73% dan 98,38%. Kapasitas adsorpsi dan fotodegradasi berturut-turut sebesar 23,90 mg/g dan 24,06 mg/g. Hasil penelitian menunjukkan bahwa CaO dari cangkang kerang darah berpotensi sebagai material alternatif yang efektif, ekonomis, dan ramah lingkungan untuk pengolahan limbah zat warna.

Kata kunci: Anadara granosa, CaO, adsorpsi, fotodegradasi, Malachite Green.

This study aimed to investigate the characteristics and effectiveness of calcium oxide (CaO) synthesized from blood cockle shell (Anadara granosa) waste as an adsorbent and photodegradation catalyst for Malachite Green. Blood cockle shells were calcined at 900°C for 3 hours and subsequently characterized using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), and Brunauer–Emmett–Teller (BET) analyses. The FTIR results revealed the formation of Ca–O bonds at a wavenumber of 420 cm⁻¹, indicating the conversion of CaCO₃ into CaO. SEM analysis showed a granular and porous surface morphology, while XRD confirmed the formation of the crystalline CaO phase. XRF analysis indicated a CaO content of 98.99%, whereas BET analysis showed a specific surface area of 1.9310 m²/g with an average pore diameter of 6.31 nm, classifying the material as mesoporous. Adsorption and photodegradation experiments demonstrated that a CaO dosage of 0.05 g achieved the highest Malachite Green removal efficiencies of 97.73% and 98.38%, respectively. The adsorption and photodegradation capacities were 23.90 mg/g and 24.06 mg/g, respectively. These findings indicate that CaO derived from blood cockle shells has strong potential as an effective, economical, and environmentally friendly alternative material for dye wastewater treatment. Keywords: Anadara granosa, CaO, adsorption, photodegradation, Malachite Green.