Ultrahigh Adsorption Capacity of Acrylic Acid-Grafted Xanthan Gum Hydrogels for Rhodamine B from Aqueous Solution

Abstract

Rhodamine B (RhB) is considered as a potential source of water pollution because it is harmful to the environment and humans, and thus, it should be removed from the water system. Hydrogels derived from polysaccharides have been received much attention for dye adsorption. In this study, acrylic acid (AAc)-grafted xanthan gum hydrogel (XGH) was synthesized by electron beam irradiation. The effects of AAc concentration and the adsorbed dose on the gel fraction and swelling ratio were studied. The XGH hydrogel structure was characterized by FTIR and SEM analyses. As a result, the sample with 75% gel fraction was selected to investigate the adsorption behaviors toward RhB. The adsorption kinetic data were in good agreement with pseudo-secondorder mode. The adsorption isotherms fitted well with the Langmuir equation with an ultrahigh maximum adsorption capacity of 2612.12 to 2777.77 mg/g at 293 to 323 K, which is a significant breakthrough in RhB uptake. Na 2 CO 3 and HCl were used to regenerate the RhB-loaded XGH. The removal efficiency was found to be nearly unchanged after five adsorption−desorption cycles. Finally, the selectivity of XGH toward cationic/anionic mixing dyes was investigated.

Xanthan Gum Hydrogels as High-Capacity Adsorbents for Dye Removal

“…For example, acrylamide was grafted to Xanthan gum and incorporated with silica nanoparticles to capture dyes. , Other researchers grafted acrylamide to Xanthan gum and cross-linked with trimethylolpropane triglycidyl ether and used it as an adsorbent to capture the Crystal Violet dye . In another study, acrylic acid was grafted to Xanthan gum to adsorb the Rhodamine dye . A sol–gel-derived Xanthan gum silica nanocomposite was used to capture cationic dyes .…”

“…26 In another study, acrylic acid was grafted to Xanthan gum to adsorb the Rhodamine dye. 27 A sol−gel-derived Xanthan gum silica nanocomposite was used to capture cationic dyes. 28 Graphene oxide cross-linked hydrogel nanocomposites of Xanthan gum were used in the adsorption of the Crystal Violet dye.…”

The Adosrption Study for the Removal of Rhodamine-B from Artificial Aquatic Solution by using Activated Hygrophila auriculata Nano Carbon

“…The equilibrium of adsorption Rh-B could be quantified using recognized adsorption isotherms 13 . The parameters achieved from the various isotherms; provided essential statistics about the adsorption mechanism of Rh-B in addition onto surface, properties and empathies of AHANC.…”

Facile Fabrication of Quaternized Sisal Fiber by Electron Beam Radiation and its Effective Adsorption for Indigo Carmine from Aqueous Solution

“…Adsorption is considered as one of the most simple and attractive methods to purify polluted water (Chowdhury et al, 2020;Du et al, 2021). In recent years, the low cost adsorbents based on natural bers have been recognized as e cient, cost-effective, and environmental friendly for contamination removal purposes (Candido et al,2021).…”