NANOFIBER ALGINAT/POLI(VINIL ALKOHOL) (PVA) UNTUK ADSORPSI CO2

DESI NUR ASTUTI, Dr. Adhitasari Suratman, M.Si; Dr. Agus Kuncaka, DEA

2016 | Skripsi | S1 KIMIA

Telah dilakukan sintesis nanofiber Alg/PVA dengan teknik elektrospining. Penelitian ini bertujuan mensintesis nanofiber Alg/PVA untuk adsorpsi gas CO2. Nanofiber Alg/PVA disintesis dari larutan alginat 2% (b/b) dan larutan PVA 10% (b/b). Larutan Alg/PVA dielektrospining membentuk nanofiber pada kondisi tegangan arus 15 kV, TTCD (Tip-to-Collector Distance) 15 cm dan diameter spinneret 0,5 mm (25 gauge). Larutan Alg/PVA divariasi rasio volume larutan Alg/PVA 0/10, 1/9, 2/8, 3/7 dan 4/6 untuk mengetahui pengaruh rasio volume terhadap morfologi nanofiber. Nanofiber Alg/PVA dielektrospining 1-5 jam untuk mendapatkan nanofiber dengan berbagai variasi basis weight (i.e. massa). Nanofiber Alg/PVA dikarakterisasi menggunakan Fourier Transform Infrared Spectoscopy (FTIR), Scanning Electron Microscope (SEM), Texture Analyzer dan Surface Area & Pore Size Analyzer. Morfologi nanofiber Alg/PVA paling optimal diperoleh dari rasio volume larutan 2/8 dengan diameter 202 ± 43 nm memiliki luas permukaan (SBET) sebesar 9,197 m2/g. Kapasitas adsorpsi CO2 nanofiber Alg/PVA dianalisis menggunakan gas trap system. Kapasitas adsorpsi diukur pada kondisi tekanan 1 atm dan temperatur 298 K. Nanofiber Alg/PVA rasio volume 2/8 mampu mengadsorp gas CO2 sebanyak 3,286 mmol/g. Peningkatan basis weight turut meningkatkan kapasitas adsorpsi nanofiber Alg/PVA. Kapasitas adsorpsi paling optimal diperoleh dari nanofiber Alg/PVA rasio volume 2/8 dengan basis weight 4955 g/m2 sebesar 4,548 mmol/g. Nanofiber Alg/PVA berpotensi dijadikan material baru untuk adsorpsi gas CO2 dengan kapasitas adsorpsi yang relatif besar, murah dan ramah lingkungan serta berpotensi untuk digunakan kembali (recycle).

Synthesis of nanofibers Alg/PVA for CO2 adsorption by electrospinning technique has been carried out. Nanofibers Alg/PVA made by alginate solution 2% (w/w) and PVA solution 10% (w/w) with volume ratios solution Alg/PVA 0/10, 1/9, 2/8, 3/7 and 4/6. The polymer solution Alg/PVA was placed in a 10 cc syringe with a 25 gauge needle, the applied voltage was 15 kV and TTCD (Tip-to-Collector Distance) was 15 cm. Nanofibers Alg/PVA electrospun for 1 - 5 hour to obtain basis weight (i.e. mass) variation. Nanofibers was characterized by FTIR, SEM, Texture Analyzer and Surface Area & Pore Size Analyzer. The SEM image showed that the smoothest and finest nanofibers was obtained from Alg/PVA volume ratios 2/8 with average diameter 202 ± 43 nm. Alg/PVA nanofibers has spesifik surface area (SBET) 9,197 m2/g. Adsorption capacity of nanofibers Alg/PVA was analyzed by ownmade gas trap system measured at 1 atm and 298 K. Adsorption capacity of nanofibers Alg/PVA volume ratios 2/8 up to 3,286 mmol/g. Adsorption capacity can be optimalized by increasing basis weight. Optimal adsorption capacity obtained from nanofibers Alg/PVA volume ratios 2/8 basis weight 4955 g/m2 with CO2 uptake up to 4,548 mmol/g. Nanofibers Alg/PVA perform high adsorption capacity, which offers new eco-friendly materrials with great potentials for CO2 capture and storage, also potentials to be recycled.

Kata Kunci : elektrospining, nanofiber, Alginat/PVA, adsorpsi CO2, gas trap system / electrospinning, nanofiber, alginate/PVA, CO2 adsorption, gas trap system