User:Eleni N. Kalivas/Notebook/CHEM-571/2015/02/11

PVA-Alg Bead Synthesis

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February 11, 2015 New syntheses: activated carbon and zeolite Procedure Procedure adapted from | Kuo-Ying Amanda Wu and Keith D. Wisecarver (1992)<br.> Prepare an aqueous solution of 13% PVA and 0.02% sodium alginate at 60°C (Stir plate on 3rd setting: ~68°C) 1 gram of PVA and 0.16 g of sodium alginate in 7 mL of water (12.5% PVA and ~0.02% alginate) Add alginate while stirring PVA-water solution ~0.1 g of nanocomposite should be added to this mixture where applicable Cool dissolved and mixed solution to 35°C Prepare 210 mL of saturated citric acid with 4% calcium chloride Add 8.4 grams (4%) of calcium chloride to 210 mL of water Add citric acid to saturation (12-15 g citric acid) 14.7g/100mL > 30.87 g/210 for solubility comparable to boric acid Add the PVA-Alg-Nanocomposite mixture drop-wise (by syringe) to the gently stirring (stir plate 3) citric acid-calcium chloride solution using a Pasteur pipette Stir for 2 hrs to allow solidification Rinse with water to remove excess reactants Measurements PVA-Alg-AC PVA: 1.001 g Alg: 0.163 g AC: 0.107 g Citric acid: 14.19 g CaCl2: 8.667 g PVA-Alg-Zeolite PVA: 1.11 g Alg: 0.162 g Zeolite: 0.105 g Citric acid: 13.679 g CaCl2: 8.385 g Results <br.> Notes Activated carbon coated PVA-Alg matrix, burst upon contact with anything Zeolite beads disintegrated New plan: focus on NaMT Friday: big batches of NaMT, try batch of NaMT+AC (to integrate AC into structure)