Molekul-molekul bio dan pewarna yang berlebihan di dalam air sisa boleh menyebabkan kesan negatif terhadap kesihatan manusia, alam sekitar dan sekitarnya. Dalam kajian ini, satu kajian penjerapan telah dijalankan dengan menggunakan manik kalsium alginat sebagai penjerap untuk menyingkirkan riboflavin dan metilena biru dari larutan akuas. Kajian telah dijalankan dalam mod berkelompok dan mod berterusan. Manik kalsium alginat telah disediakan melalui kaedah silang antara natrium alginat dan kalsium kloride dan kemudiannya dikeringkan di dalam pengering pembekuan pada suhu -50 ˚C. Kesan daripada nilai-nilai pH bagi larutan tersebut (pH 3-pH 11) terhadap prosess penjerapan telah dinilai dalam prosess penjerapan berkelompok. Sementara itu, kesan kepekatan awal bagi larutan tersebut (50 ppm-250 ppm) terhadap masa rentas bulus dikaji dalam prosess penjerapan berterusan. Kesemua prosess penjerapan telah dijalankan pada suhu bilik. Riboflavin didapati mempunyai pengambilan penjerapan kapasiti yang maksimum pada keadaan berasid manakala metilena biru mempunyai pengambilan penjerapan kapasiti yang maksimum pada keadaan alkali. Masa rentas bulus bagi penjerapan riboflavin pada kepekatan yang berbeza adalah lebih pendek berbanding masa rentas bulus bagi penjerapan metilena biru. Manik kalsium alginat telah menunjukkan keupayaan yang lebih tinggi untuk penyingkiran metilena biru dalam larutan akuas berbanding riboflavin.
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Biomolecules and dyes molecules excessive in waste water might cause negative impact on human health, environment and surrounding. In the present work, an adsorption study was carried out using calcium alginate beads as adsorbent for the removal of riboflavin and methylene blue from aqueous solution. The investigation was carried out in batch mode and continuous mode. Calcium alginate beads were prepared by crosslinking method between sodium alginate and calcium chloride and dried in a freeze dryer at -50 ˚C. The effect of pH solution value (pH 3-pH 11) towards adsorption process was evaluated in batch adsorption process. Meanwhile, the effect of initial solution concentration (50 ppm-250 ppm) towards the breakthrough time was studied in the continuous adsorption process. All the adsorption process was conducted at room temperature. Riboflavin was found to have maximum adsorption uptake capacity in acidic condition meanwhile methylene blue has a maximum adsorption uptake capacity in alkaline condition. The breakthrough time for riboflavin adsorption at different concentrations was shorter by comparing to the breakthrough time for methylene blue adsorption. From this experiment, calcium alginate beads have shown higher ability to remove methylene blue than riboflavin in aqueous solution.
The removal of riboflavin and methylene blue from aqueous phase via alginate-based bio sorbent / Rasyidah Adilah Molok