Kajian ini bertujuan menghasilkan hidrogel responsif berasaskan selulosa bakteria yang diperoleh daripada Nata de
Coco (NDC) dan asid akrilik (AA). Tiga jenis sampel telah disediakan berdasarkan nisbah NDC:AA iaitu sampel hidrogel
A [1:1], B [2:1] dan C [3:1]. Pencangkukan AA terhadap molekul NDC menggunakan kaedah pempolimeran radikal
Gamma (GRP) menghasilkan hidrogel NDC-AA (sumber: 60Co). Kaedah yang menggunakan tenaga yang tinggi ini akan
menghasilkan radikal bebas seperti OH•, H•, H2O2 dan H2. Kesemua radikal ini menyerang kumpulan berfungsi yang
terdapat pada NDC dan AA seterusnya menggalakkan proses pencangkukan AA terhadap NDC. Hidrogel B [2:1] dipilih dan
diuji sebagai penjerap metilena biru (MB) dan perubahan keamatannya telah dianalisis menggunakan spektrofotometer
UV-VIS. Keputusan yang diperoleh telah diselaraskan dengan dua model isoterma, Langmuir dan Freundlich. Perbandingan
pemalar bagi kedua-dua model isoterma ini mendapati hidrogel B [2:1] yang dihasilkan telah mematuhi kedua-dua
model isoterma. Keputusan yang diperoleh ini menyokong keupayaan hidrogel B [2:1] untuk digunakan sebagai penjerap
alternatif MB yang paling efisien.
In this study, Bacterial cellulose (BC) grafted with Acrylic acid (AA) was prepared using Co60 γ-rays source (30 KGy).
Although many samples were prepared, BC: AA with ratio of 1:1 labelled as A1 and 2:1 labelled as A2 gave the most
significant results. Hence these particular ratios have been selected and further investigated. AA was proven grafted onto
BC by using ATR-FTIR due to the absent of C-O stretching (1040 cm-1) in both hydrogels. The SEM image of both hydrogels
samples showed highly porosity networks structure have been produced. The physical properties of the hydrogels such
as equilibrium water content (%) and swelling ratio (%) in different pH buffer solution were measured. It was found
that the equilibrium water content (%) of A1 was 93.10% while A2 was 74.83%, respectively. The results indicated that
the equilibrium water content (%) increased by gaining the AA concentration. At pH10, the A2 swelling ratio (%) was
two folded with 3350% in comparison with the A1. For the removal of methylene blue (MB) from aqueous solution, the
results from the UV-VIS spectroscopy demonstrated that the A2 sample hydrogel was also an effective absorbent material