Abstract
Natural gums can be tailored and used for the removal of toxic dyes like crystal violet via grafting techniques. However, grafting via microwave irradiation showed both higher yield and fast reaction kinetics as compared to conventional grafting. Silane modified nanoclay has been used to prepare acrylic acid grafted guar gum nanocomposites via microwave irradiation technique. The grafting was confirmed via infrared spectroscopy while XRD diffractograms suggested exfoliation of modified nanoclay in guar gum grafted acrylic acid. The reaction kinetic parameters have been optimized. The effect of nanoclay on swelling characteristics has been examined. The sensitivity of pH on swelling capabilities has also been assessed. The efficiency of the superabsorbent nanocomposite on the absorption of crystal violet dye has been studied. The superabsorbent nanocomposite loaded with 1.75% modified nanocaly was found to be optimal concentration for the removal of crystal violet dye.
Highlights
Superabsorbents are three dimensional networks with a capacity to absorb and retain large quantities of water.How to cite this paper: Shruthi, S.B., Bhat, C., Bhaskar, S.P., Preethi, G. and Sailaja, R.R.N. (2016) Microwave Assisted Synthesis of Guar Gum Grafted Acrylic Acid/Nanoclay Superabsorbent Composites and Its Use in Crystal Violet Dye Absorption
A new band at 1584 cm−1 can be seen for guar gum grafted acrylic acid indicating formation of ester group and the presence of carboxylic anion [25]
Transmission Electron Microscopy (TEM) images of 1.75% NC loaded guar gum are shown in Figure 2(b) and Figure 2(c)
Summary
Superabsorbents are three dimensional networks with a capacity to absorb and retain large quantities of water. (2016) Microwave Assisted Synthesis of Guar Gum Grafted Acrylic Acid/Nanoclay Superabsorbent Composites and Its Use in Crystal Violet Dye Absorption. Biopolymeric materials are abundantly available, sustainable, environment friendly, they have inferior properties as compared to synthetic polymers They have to be modified for various applications. Guar gum is a plant based hydrocolloid and an edible polysaccharide and is extracted from cyamopsistetragonoloba [6] It mainly consists of galactomannans with (1, 4)-linked-B-D-mannopyranose units [7]. Similar observations that have been made by Sharma et al for grafted gum exhibited both water retention as well as dye removal properties [10]. Studies on grafted guar gum loaded with nanofiller superabsorbent nanocomposites for dye removal applications are very few. In this study guar gum along with silane modified nanoclay has been grafted with acrylic acid via microwave irradiation technique. The synthesized super absorbent nanocomposite has been investigated for crystal violet dye removal
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