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YUSUF MATHIINUL HAKIM

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Abstrak (Bhs. Indonesia)

Fotokatalis berbasis Ag3PO4 adalah jenis fotokatalis yang aktif pada cahaya tampak karena memiliki energi celah pita yang kecil dibandingkan fotokatalis yang umum digunakan. Penelitian ini bertujuan untuk melihat pengaruh modifikasi berupa adanya defect (cacat kristal), pembentukan komposit dengan g-C3N4 dan dopan platina pada sintesis fotokatalis berbasis Ag3PO4 untuk degradasi zat warna Rhodamin B dan agen antibakteri Staphylococcus aures. Fotokatalis defect-Ag3PO4/g-C3N4/PtCl6- berhasil disintesis dengan metode kopresipitasi menggunakan bahan prekursor AgNO3, Ca10(PO4)6(OH)2, g-C3N4, dan H2PtCl6. Pembentukan defect-Ag3PO4/g-C3N4/PtCl6- terbukti mampu meningkatkan aktivitas fotokatalitik pada degradasi zat warna Rhodamin B dan aktivitas antibakteri terhadap bakteri Staphylococcus aureus. Fotokatalis defect-Ag3PO4/g-C3N4/PtCl6- memiliki kemampuan fotodegradasi lebih baik dibandingkan Ag3PO4 kontrol, defect-Ag3PO4, defect-Ag3PO4/PtCl6-, dan defect-Ag3PO4/g-C3N4 dengan konstanta laju fotodegradasi yaitu 0,2575 menit-1. Aktivitas antibakteri diuji menggunakan metode cakram difusi dan hasilnya menunjukkan defect-Ag3PO4/g-C3N4/PtCl6- memiliki aktivitas antibakteri yang lebih tinggi dibandingkan Ag3PO4 kontrol, defect-Ag3PO4, defect-Ag3PO4/PtCl6-, dan defect-Ag3PO4/g-C3N4 pada konsentrasi 1.000 ppm. Peningkatan kemampuan fotodegradasi dan aktivitas antibakteri defect-Ag3PO4/g-C3N4/PtCl6- disebabkan oleh efek sinergis antara defect, komposit g-C3N4, dan dopan PtCl6-.

Abtrak (Bhs. Inggris)

The Ag3PO4-based photocatalyst is a type of photocatalyst that is active in visible light because it has lower bandgap energy than commonly used photocatalysts. This research aims to investigate the effect of modifications of defect, composite formation with g-C3N4, and platinum dopant in Ag3PO4 for degradation of Rhodamine B dye and antibacterial agents of Staphylococcus aureus. Defect-Ag3PO4/g-C3N4/PtCl6- was successfully synthesized by the co-precipitation method using the precursor of AgNO3, Ca10(PO4)6(OH)2, g-C3N4, and H2PtCl6. The formation of defect-Ag3PO4/g-C3N4/PtCl6- was shown to increase photocatalytic activity in Rhodamine B degradation and antibacterial activity against Staphylococcus aureus bacteria. The photocatalyst of defect-Ag3PO4/g-C3N4/PtCl6- has better photodegradation ability than Ag3PO4 control, defect-Ag3PO4, defect-Ag3PO4/PtCl6-, and defect-Ag3PO4/g-C3N4 with a photodegradation rate constant of 0.2575 minutes-1. Antibacterial activity was tested using the diffusion disc method and the results showed that defect-Ag3PO4/g-C3N4/PtCl6- had higher antibacterial activity than Ag3PO4 control, defect-Ag3PO4, defect-Ag3PO4/PtCl6-, and defect-Ag3PO4/g-C3N4 at a concentration of 1,000 ppm. Increased photodegradation ability and antibacterial activity of defect-Ag3PO4/g-C3N4/PtCl6- is caused by a synergistic effect of defect, g-C3N4, and PtCl6- dopant.

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