Abstract
A novel method for the disassembly of synthetic hydrogels in situ and thereby enhanced adsorption of crystal violet dye is reported. Silicon present in the husk ashes of Panicum miliare is used as the trigger for disassembly of poly(2-acrylamido-1-propane sulfonic acid-co-itaconic acid) hydrogels. Disassembling ability of the ash was determined by changing the temperature of the husk ash. Surface area and particle sizes of both the disassembled and assembled forms of the hydrogels were determined by E. Suito’s method. Removal of crystal violet dye from aqueous solution and the respective adsorption capacities of disassembled and assembled forms of hydrogels were compared by varying parameters such as pH, temperature, and agitation speed. Concentration of the dye in aqueous solution was determined by using UV-Visible spectrophotometer. FTIR analysis was carried out for the characterization of the hydrogels, ash blended hydrogels, and the free ashes. SEM imaging was carried out to differentiate the surfaces of the assembled and disassembled hydrogels.
Highlights
Many researches are being done on hydrogels to increase and improve their applications in various fields
Regular variation in the particle sizes implies that the percentage of white ash content increases the degree of disassembly of the hydrogels when introduced into aqueous solution
It has been shown that its ash can be used for deciding the size and surface of the soft substances, namely, poly(AMPS-co-itaconic acid (IA)) hydrogels
Summary
Many researches are being done on hydrogels to increase and improve their applications in various fields. We have shown that the husk ash of the same millet can be a potential source of silicon. This agricultural waste is weighing 0.0005-0.0006 g per husk. In this study poly(AMPS-co-IA) hydrogels are used as the adsorbent for the removal of crystal violet dye from aqueous solution. When put into an aqueous solution, this polymer hydrogels were disassembled into smaller units by the inclusion of husk ash into their network. These husk ashes were obtained by dehusking Pm and heating them strongly. Variation in the adsorption of the dye with respect to agitation speed, pH, and temperature of the system is reported
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