OPTIMASI KONSENTRASI KITOSAN BERAT MOLEKUL RENDAH UNTUK PEMBUATAN NANOFIBER PVA/KITOSAN SEBAGAI MATRIKS FOTOKATALIS

ERNA KHOIRIYAH LESTARI, Dr. Sc. Ari Dwi Nugraheni, S.Si., M.Sc.,;Dr. Eng. Kuwat Triyana, M.Si.

2019 | Skripsi | S1 FISIKA

Telah dilakukan optimasi konsentrasi kitosan berat molekul rendah untuk pembuatan nanofiber poly(vinyl alcohol) (PVA)/Kitosan sebagai matriks fotokatalis dengan metode elektrospining. PVA (10v/v%) (89.000-98.000) g/cm3 dibuat dengan pelarut aquades sedangkan kitosan berat molekul rendah dibuat dalam pelarut asam asetat (2%). Pengoptimalan nanofiber PVA/kitosan diperoleh dengan variasi konsentrasi larutan PVA/kitosan 10%/10%, 10%/11%, 10%/12%, dan 10%/13%. PVA/kitosan dicampur dengan rasio massa 85/15. Larutan PVA/kitosan diuji dengan konduktivitimeter, diperoleh nilai konduktivitas pada rentang (998-1178) mikro S/cm. Nilai konduktivitas bertambah seiring dengan pertambahan kitosan. Pembuatan nanofiber dilakukan dengan menggunakan elektrospining. Nanofiber PVA/kitosan hasil elektrospining dikarakterisasi menggunakan mikroskop dan Scanning Electron Microscope (SEM). Diperoleh nanofiber pada berbagai variasi konsentrasi PVA/kitosan dengan rentang diameter (96-303) nm. Diameter nanofiber bertambah seiring penambahan konsentrasi kitosan. Untuk dapat diaplikasikan dalam pengembangan fotokatalis, dilakukan crosslink nanofiber PVA/kitosan dengan Glutaraldehyde (GA). Diperoleh diameter nanofiber bertambah setelah dilakukan crosslink d engan GA.

The optimization of chitosan concentration low molecular weight of the solution has been succeeding acquired to fabricate of nanofiber poly (vinyl alcohol) (PVA)/Chitosan as a photocatalyst matrix by electrospinning method. PVA(10v/v%) (89.000-98.000) was made with distilled water solvent and Chitosan low molecular weight was made in an acetic acid solvent (2%). Optimization of PVA/Chitosan nanofiber was obtained by varying the concentration of PVA/Chitosan solution 10% / 10%, 10% / 11%, 10% / 12%, and 10% / 13%. PVA/Chitosan was mixed in 85/15 mass ratio. PVA / Chitosan solution was tested with a conductivity meter, obtained conductivity values in the range (998-1178) mikro S/cm. Nanofibers were fabricated by electrospinning and characterized by optical microscope and SEM. The diameter of Nanofibers were obtained by range (96-303) nm. To be developed as a photocatalyst application, it was needed crosslinking of PVA / Chitosan nanofiber with Glutaraldehyde (GA). The addition of crosslinking GA made the diameter of nanofibers increasing.

Kata Kunci : Poli(vinyl alcohol), Kitosan, Berat Molekul, Crosslink, Fotokatalis/Poli(vinyl alcohol), Chitosan, Molecular Weight, Crosslink, Photocatalyst