Pembuatan Hidrogel Komposit Alginat- Nanokristal Selulosa yang Diisolasi dari Kulit Durian (durio zibethinus) dan Diperkuat oleh Mangan Dioksida untuk Adsorpsi Metilen Biru

Abstract

Research on cellulose nanocrystal-based composite hydrogel isolated from durian peel has been successfully carried out. The cellulose nanocrystals were further modified into composite hydrogels. Where the composite hydrogel synthesized from this study included NKS composite hydrogel, NKS+ MnO2 0,05%, NKS+MnO2 0,1%, NKS+MnO2 0,3% and hydrogel without NKS. The resulting composite hydrogel was then analyzed for DSA value, morphology test with SEM, chemical properties test using FTIR and MB adsorption test with UV-Vis. Based on the research that has been done, it was found that the addition of MnO2 to the composite hydrogel from the composite hydrogel. In this study, the DSA obtained from the composite hydrogels were hydrogel without NKS 1.145%, NKS composite hydrogel 1.770%, NKS+ MnO2 0,05%, namely 2.010%, NKS+ MnO2 0.1%, namely 1.465% and NKS+ MnO2 0.3% that is 995%. The addition of MnO2 to the hydrogel caused an increase in intensity and a shift in the wavenumber of the observed absorption peaks which indicated that the crosslinking process and the formation of the hydrogel had been successfully carried out. Based on the results of SEM after adding MnO2 to the hydrogel, it was observed that the pores in the morphological structure had a larger size than the hydrogel without the addition of MnO2. The hydrogel composite produced from this study was then used as an adsorbent for MB dye, from the results obtained that the addition of MnO2 to the hydrogel can increase the adsorption efficiency of MB dye, but the addition of large amounts of MnO2 to the hydrogel does not guarantee an optimal increase in adsorption. The highest adsorption capacity of this study was obtained by NKS+MnO2 0.05% hydrogel, which was 24.80 mg/g with an adsorption capacity of 32%.