title: Efficient and rapid adsorption characteristics of templating modified guar gum and silica nanocomposite toward removal of toxic reactive blue and Congo red dyes.
abstract: The present study highlights the potentiality of sol-gel synthesized guar gum-graft-poly (acrylamide)/silica (g-GG/SiO2) hybrid nanocomposite toward the rapid removal of toxic reactive blue 4 (RB) and Congo red (CR) dyes from aqueous solution. Various physicochemical characterizations support the feasibility of the functionalized guar gum matrix as efficient template for the formation of homogeneous nanoscale silica particles. The composite demonstrates rapid and superior adsorption efficiency of RB (Qmax: 579.01 mg g(-1) within 40 min) and CR (Qmax: 233.24 mg g(-1) within 30 min) dyes from aqueous environment. Here, the pH driven adsorption process depends strongly on the ionic strength of the salt solution. The adsorption kinetics data predicts that pseudo second-order (surface adsorption) and intraparticle diffusion take place simultaneously. The adsorption equilibrium is in good agreement with the Langmuir isotherm, while the thermodynamics study confirms spontaneous nature of the adsorption process. Desorption study predicts the excellent regenerative efficacy of nanocomposite.
authors.affiliation: Polymer Chemistry Laboratory, Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India. Electronic address: sagarpal1@hotmail.com.
authors.forename: Sagar
authors.initials: S
authors.lastname: Pal
authors.affiliation: Polymer Chemistry Laboratory, Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India; Tata Steel R&D, Jamshedpur 831 007, India.
authors.forename: Abhay Shankar
authors.initials: AS
authors.lastname: Patra
authors.affiliation: Polymer Chemistry Laboratory, Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India.
authors.forename: Soumitra
authors.initials: S
authors.lastname: Ghorai
authors.affiliation: Polymer Chemistry Laboratory, Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India.
authors.forename: Amit Kumar
authors.initials: AK
authors.lastname: Sarkar
authors.affiliation: Polymer Chemistry Laboratory, Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India.
authors.forename: Vivekananda
authors.initials: V
authors.lastname: Mahato
authors.affiliation: Tata Steel R&D, Jamshedpur 831 007, India.
authors.forename: Supriyo
authors.initials: S
authors.lastname: Sarkar
authors.affiliation: Indian Institute of Science Education & Research, Pune, India.
authors.forename: R P
authors.initials: RP
authors.lastname: Singh
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000302:isolation & purification* / Q000633:toxicity; D005685:Galactans / Q000737:chemistry*; D007700:Kinetics; D008351:Mannans / Q000737:chemistry*; D053761:Nanocomposites; D053149:Plant Gums / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D005685:Galactans; D008351:Mannans; D053149:Plant Gums; D012822:Silicon Dioxide; C007894:guar gum
keywords: Adsorption; Congo red; Nanocomposite; Reactive blue