Superabsorbent Cellulose–Clay Nanocomposite Hydrogels for Highly Efficient Removal of Dye in Water

Abstract

Toxic dyes have threatened human health through the consumption of polluted water, so removal of dyes from wastewater has become a hot topic in both academic and industrial fields. Herein, we reported a kind of cellulose−clay hydrogel with superabsorbent properties, superior mechanical performance, and high dye removal efficiency. The main strategy for the preparation of superabsorbent hydrogels was chemical crosslinking of cellulose, carboxymethyl cellulose (CMC), and the intercalated clay in NaOH/urea aqueous solution. The as-prepared hydrogels exhibited high absorption capacity for methylene blue (MB) solution through a spontaneous physic-sorption process which fitted well with pseudo-second-order and Langmuir isotherm models. The maximum removal efficiencies of hydrogel samples for MB solutions with concentrations of 10 mg L −1 and 100 mg L −1 were 96.6% and 98%, respectively. These results demonstrated that cellulose−clay nanocomposite hydrogels were effective adsorbents for removal of MB dyes, which would provide a new platform for dye decontamination.

Functionalized magnetic biopolymeric graphene oxide with outstanding performance in water purification

“…Nanostructured composite materials have attracted significant attention as new-generation adsorbents for dye removal. Examples include clays, exfoliated titanate layers, mesoporous carbons, carbon nanofibers, and polyanilines, all of which have been used as the main constituent of nanocomposite/composite building blocks [9][10][11][12][13][14] . Among these materials, graphene oxide (GO), a two-dimensional (2D) carbon nanomaterial, offers attractive and unique physicochemical properties 15 and is considered an excellent adsorbent 16 .…”

Engineering biodegradable polymeric network for the efficient removal of organo‐amphiphilic toxicants

“…Based on Host‐Guest analysis, C1 and C2B were implemented to remove dyes from aqueous phase . Presence of pores makes the surface uneven and expected to initiate the adsorption on them.…”

Assembly of gelatin biopolymer to fibrous sepiolite clay for efficient dye removal from wastewater

“…The assembly of biopolymers to clay minerals giving rise because of their synergistic effect regarding both the mechanical and the absorption properties of these systems . Recently, several attempts have been made to composite the adsorbents with biopolymers, such as poly(vinyl alcohol), carrageenan, chitosan, alginate, cellulose, and silk fibroin which led to enhancement in their adsorption capacity. Gelatin (GE) is a natural biopolymer and has a long history of safe use in cosmetic, pharmaceutical and food industries .…”