Sains Malaysiana 47(4)(2018): 715-723

http://dx.doi.org/10.17576/jsm-2018-4704-09

Kebolehserapan Metilena Biru oleh Hidrogel Selulosa Bakteria Teradiasi Gamma menggunakan Isoterma Langmuir dan Freundlich

(Absorption Ability of Gamma Irridiated Bacterial Cellulose Hydrogel using Langmuir

and Freundlich Isotherme)

AZWAN MAT LAZIM*, ADIL HAKAM OSMAN & MARYAM MOKHTAROM

Pusat Pengajian Sains Kimia & Teknologi Makanan, Fakulti Sains & Teknologi, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Diserahkan: 22 Jun 2017/Diterima: 26 Oktober 2017

ABSTRAK

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.

Kata kunci: Hidrogel; metilena biru; penjerapan; selulosa bakteria; teknik sinaran gamma

ABSTRACT

This study aimed to produce a responsive hydrogel based on bacterial cellulose obtained from Nata de Coco (NDC) and acrylic acid (AA). Three samples were prepared by ratio of NDC:AA and labelled as hydrogel A [1:1], B [2:1] and C [3:1]. The grafting of AA onto NDC molecules using gamma radiation polymerisation (GRP) method resulting in the formation of NDC-AA hydrogel (source: ⁶⁰Co). The high energy used in this method produced free radicals such as OH•, H•, H₂O₂ and H₂. These free radicals attacked the functional groups of NDC and AA, allowing AA to be grafted onto NDC. Hydrogel B [2:1] was selected for further test in methylene blue (MB) adsorption using UV-VIS spectrophotometer. All data were analyzed and adjusted according to Langmuir and Freundlich isotherm model. The comparison of constant in both samples were analyzed and found that hydrogel B [2:1] data has fitted both models. Therefore, the results obtained supported the ability of hydrogel B [2:1] as an alternative MB adsorbent.

Keywords: Adsorption; bacterial cellulose; gamma radiation technique; hydrogel; methylene blue

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*Pengarang untuk surat-menyurat; email: azwanlazim@ukm.edu.my