Cross-Linking Study Of Cellulose/CMC From Oil Palm Fiber Waste With Citric Acid
DOI:
https://doi.org/10.68115/reprokimia.v4i2.258Keywords:
Hydrogel, Cellulose, Oil palm fiber, Citric acid, Cross-linkAbstract
Selulosa dari limbah mesokarp kelapa sawit dapat dimanfaatkan sebagai bahan baku pembuatan hidrogel. Dalam penelitian ini, selulosa diekstrak melalui 2 tahapan, diantaranya (1) proses hidrolisis dengan NaOH, (2) proses bleaching menggunakan H2O2 3%. Selulosa yang dihasilkan bertekstur halus dengan warna putih. Reaksi ikat silang dari asam sitrat, CMC, dan selulosa serat mesokarp kelapa sawit dilakukan dalam proses sintesis membentuk hidrogel. Spektrum infra red (IR) hidrogel selulosa/CMC menunjukkan sintesis berhasil dilakukan ditandai dengan adanya puncak serapan pada bilangan gelombang 1700-1750 cm-1 mengindikasikan pembentukan ikatan C=O ester, puncak pada bilangan gelombang 1640 cm-1 dan 1356 cm-1 masing-masing menunjukkan substitusi gugus karboksimetil pada rantai CMC dengan gugus -COO- dan -CH2-, puncak yang melebar pada bilangan gelombang 950-1050 cm-1 mengindikasikan adanya serapan dari cincin piranosa, puncak pada bilangan gelombang 3265 cm-1 mengindikasikan vibrasi gugus -OH yang menunjukkan sifat hidrofilik dari hidrogel/CMC terikat silang sitrat. Hasil menunjukkan bahwa asam sitrat berperan sebagai cross-linker yang murah dan tergolong asam organik dengan sifat hidrofilik yang non toksik dalam pembuatan hidrogel selulosa/CMC.
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