Microwave Assisted Synthesis of Guar Gum Grafted Acrylic Acid/Nanoclay Superabsorbent Composites and Its Use in Crystal Violet Dye Absorption

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 infra-red 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.

Removal of crystal violet dye using grafted guar gum along with nanoclay and MWCNT

“…This is mainly attributed to the in-situ grafting of guar gum with acrylic acid along with nanoclay and sonication. A similar observation was made in our earlier work [15] and Yoonessi et.al., [18]. A similar trend is observed for guargum/MWCNT composites wherein, the peaks of MWCNT disappear.…”

“…Hence it has a promising potential for removal of both heavy metals and dyes from waste water [14]. Our earlier work on guar gum grafted acrylic acid with nanoclay gave encouraging results [15] for removal of crystal violet dye. In that study the emphasis was mainly on microwave assisted synthesis and optimization…”

“…represents characteristic -O-H stretching and -C-H stretching vibrations respectively while the peak at 1655 cm -1 is due to the characteristic amide I carbonyl stretching [16]. The peaks at 1434 and 1084 cm -1 depicts -C-H and -O-H bending vibrations [15]. Guar gum grafted acrylic acid shows a newer characteristic peak at 1737 cm -1 due to carbonyl stretching of the carboxylic acid which ensures the grafting reaction [16].…”

Borax-Cross-Linked Guar Gum-Manganese Dioxide Composites for Oxidative Decolorization of Methylene Blue

“…Several studies have been reported on guar gum-based composites for the removal of organic dyes from aqueous solutions. For instance, Shruthi et al studied the efficiency of the guar gum-grafted acrylic acid/nanoclay composite on the adsorption of crystal violet dye and reported that it requires at least three hours to reach the maximum dye adsorption capacity of 12.5 mg/g [65]. Saxena and Sharma investigated the adsorption and kinetic studies on the removal of methyl red dye from aqueous solution using guar gum powder, which showed a monolayer dye adsorption capacity of 66.66 mg/g in three hours at pH 4.2 [66].…”

Investigation on guar gum and chitosan based polymer composite for oilfield water shut off fluid

“…It has been found that synthetic polymer-based gel has potential to work at in low or high reservoir temperature. Guar gum grafted acrylonitrile (GG-g-PAN) has been synthesized by the various combination of polymerizations, for example okra grafted acrylonitrile (Mishra and Pal, 2007), chitosan grafted acrylonitrile (Singh et al, 2004), guar gum grafted acrylic acid (Shruthi et al, 2016) and guar gum grafted acrylonitrile (Thimma et al, 2003).…”