Pengaruh konsentrasi asam sulfat  pada sintesis nanokristal selulosa bonggol jagung

Nadiyya Nur Maulidanti; Abdul Malik Nurdin; Ai Fifih Luthfiyah; Astri Senania

doi:10.21831/jps.v1i1.67993

Pengaruh konsentrasi asam sulfat pada sintesis nanokristal selulosa bonggol jagung

Nadiyya Nur Maulidanti, Program Studi Kimia, FMIPA Universitas Garut, Indonesia
Abdul Malik Nurdin, Program Studi Kimia, FMIPA Universitas Garut, Indonesia
Ai Fifih Luthfiyah, Program Studi Kimia, FMIPA Universitas Garut, Indonesia
Astri Senania, Program Studi Kimia, FMIPA Universitas Garut, Indonesia

10.21831/jps.v1i1.67993

Abstract

Penelitian ini bertujuan untuk mengidentifikasi pengaruh asam sulfat pada sintesis nanokristal selulosa dari bonggol jagung. Isolasi selulosa dari bonggol jagung dilakukan dengan dua tahap yaitu delignfikasi yang dengan menggunakan NaOH dan bleaching dengan NaOCl. Sintesis nanokristalin selulosa dilakukan dengan menggunakan metode hidrolisis asam sulfat dengan variasi konsentrasi pada suhu 45℃ selama 120 menit. Nanokristalin yang diperoleh dikarakterisasasi nilai kristalinitas dan ukuran kristal menggunakan analisis XRD dan identifikasi gugus fungsi dengan menggunakan FTIR. Hasil penelitian menunjukan asam sulfat dapat mempengaruhi hasil sintesis dengan teridentifikasi adanya gugus S=O pada permukaan karena adanya perekatan gugus dari H2SO4. Nilai kristalinitas selulosa terbesar diperoleh pada konsentrasi asam sulfat 60% menghasilkan nanokristal selulosa dengan nilai kristalinas sebesar 89,63%, sedangkan ukuran nanokristal terkecil (0,88 nm) dapat diperoleh pada konsentrasi 55%.

Effect of sulfuric acid concentration on the synthesis of cellulose nanocrystals of corncob

This study aimed to identify the effect of sulfuric acid on the synthesis of cellulose nanocrystals from corn cob. Cellulose isolation from corn cob was carried out in two stages: delignification using NaOH and bleaching with NaOCl. Cellulose nanocrystals were synthesized using sulfuric acid hydrolysis with varying concentrations at 45°C for 120 minutes. The obtained nanocrystals were characterized for crystallinity and crystal size using X-ray diffraction (XRD) analysis, and functional groups were identified using Fourier-transform infrared spectroscopy (FTIR). The results indicate that sulfuric acid affects the synthesis outcome, as evidenced by the presence of S=O groups on the surface due to the bonding of H2SO4 groups. The highest cellulose crystallinity was achieved at a sulfuric acid concentration of 60%, resulting in cellulose nanocrystals with a crystallinity value of 89.63%. The smallest nanocrystal size (0.88 nm) was obtained at a concentration of 55%.

Keywords

bonggol jagung, hidrolisis asam, nanokristal selulosa

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DOI: https://doi.org/10.21831/jps.v1i1.67993