Adsorption of soluble Pb(II) by a photocrosslinked polysaccharide hybrid: A swelling-adsorption correlation study. (1st December 2017)

• Record Type: Journal Article
• Authors: Pal, Abhijit; Majumder, Kunal; Sengupta, Srijoni; Das, Tamalika; Bandyopadhyay, Abhijit
• Is Part Of: Carbohydrate polymers. Volume 177(2017)
• Page Start: 144
• Page End: 155
• Publication Date: 2017-12-01
• Subjects: Guar gum (PubChem CID: 44134661) -- Xanthan gum (PubChem CID: 7107) -- Benzophenone (PubChem CID: 3102) -- Sodium Lauryl Sulfate (PubChem CID: 3423265) -- Lead nitrate (PubChem CID: 24924) -- Sodium acetate (PubChem CID: 517045) -- Acetic acid (PubChem CID: 176) -- Hydrochloric acid (PubChem CID: 313) -- Sodium hydroxide (PubChem CID: 14798) -- Ethylene diamine tetra acetic acid (EDTA) (PubChem CID: 6049) -- Xylenol orange (PubChem CID: 73041); Adsorption -- Heavy metal -- Natural gum -- UV crosslinking -- Swelling; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2017.08.122
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Ultrapure biosorbent synthesized from a polysaccharide mix. Employed for sorption of inorganic Pb(II) from water. Biosorbent equally effective under competitive and non-competitive conditions. Swelling based indigenous technology adopted for sorption experiments. A correlation between swelling and adsorption efficiency of biosorbent established. Abstract: A biosorbent for adsorption of soluble, inorganic Pb(II) was prepared through a photocrosslinking of a mixture of xanthan gum and guar gum at various mass ratios. The polysaccharide mixes were irradiated using UV A in presence of benzophenone. Chemical crosslinks were formed which led to a controlled swelling of the polysaccharide mix (swelling ratio <20%), referred as crosslinked hybrid in the text. The hybrids were characterized for microstructure, rheology, surface area and surface charge behavior. Interesting changes in crystallographic pattern, both in the pre and the post adsorption stages, was investigated using x-ray diffraction technique. Adsorption efficiency was estimated in respect of blend composition, adsorbate-adsorbent concentration and pH under competitive and non-competitive conditions. A correlation between the swelling of the crosslinked hybrid and the metal adsorption was drawn at various pH to elucidate an interaction between the two phenomena.