Application of biopolymer composites in arsenic removal from aqueous medium: A review

Abstract

Polymeric sorbents and biocomposites a b s t r a c t Various sorbents have been used to remove arsenic from contaminated water which is one of the most toxic elements for mankind. In this review, concentration has been focused on the removal of arsenic from aqueous medium using natural, non-toxic, biodegradable and eco-friendly polymeric materials. Therefore, chitosan has been selected one of the most appropriate biopolymer to remove heavy metals form contaminated water particularly arsenic. Therefore, chitosan grafting, blending, doping and biocomposite formulations with polymeric and/or activated inorganic materials have gained much attention. This review provides the relevant literature on the applications of polymeric biocomposites for removal of arsenic from aqueous medium. However, the literature survey reveals that very limited attention has been focused on the applications of biocomposites for the removal of arsenic in the past. The sorption capacities of sorbents and LD 50 of the arsenic compounds have been compiled.

Chromium (VI) removal from neutral aqueous media using banana trunk fibers (BTF)-reinforced chitosan-based film, in comparison with BTF, chitosan, chitin and activated carbon

“…Heavy metal ions attracted the attention of researchers in view of their toxicity [3,4], bioaccumulation, bio-magnification, persistence and non-biodegradability [5]. Several technologies have been used to remove metal ions from industrial aqueous wastes, and sorption is one of the widely practiced processes [6]. Therefore, the removal of metal ions to an optimum level by a cost-effective and eco-friendly manner is of great interest [7].…”

Arsenic Removal from Mining Effluents Using Plant-Mediated, Green-Synthesized Iron Nanoparticles

“…The precipitation, adsorption, and ion-exchange methods are, therefore, less applicable for removal of trivalent arsenic. Accordingly, the optimum arsenic removal methods are usually composed of two individual stages: initial oxidation of arsenite to arsenate, and subsequent removal of arsenate [13].In spite of the availability of biological and chemical methods (chemical oxidation, electrochemical acidification) to remove arsenic from the aqueous solutions, the efficiency of some natural and agro-based sorbents, such as banana peel [14], rice husk [15], red mud [16], clay minerals [17], and polymeric materials [18], has been investigated. Among the other sorbents tested, metallic nanoparticles, such as titanium, zirconium, and iron, have shown higher sorption efficiencies towards arsenic ions.…”

“…In spite of the availability of biological and chemical methods (chemical oxidation, electrochemical acidification) to remove arsenic from the aqueous solutions, the efficiency of some natural and agro-based sorbents, such as banana peel [14], rice husk [15], red mud [16], clay minerals [17], and polymeric materials [18], has been investigated. Among the other sorbents tested, metallic nanoparticles, such as titanium, zirconium, and iron, have shown higher sorption efficiencies towards arsenic ions.…”

A new magnetic bio-sorbent for arsenate removal from the contaminated water: Characterization, isotherms, and kinetics

“…Therefore, different procedures, such as ion exchange, adsorption, precipitation, and membrane techniques have been studied for AS removal from aqueous solutions, among which, adsorption technique is more popular and practical, cost-effective, easy to use, which has a good efficiency (1)(2)(3). Different adsorbents have been studied for As removal, such as hydroxides and oxides of iron(III) (1,(3)(4)(5), hydroxides and oxides of aluminum (1,6), activated carbon (7), chitosan (8,9), activated alumina (10), zinc oxide (1,11), biosorbent (9,12), layered double hydroxides (LDH s ) (13)(14)(15)(16)(17)(18)(19), and magnetic Fe 3 O 4 -graphene (20). LDHs are known as inorganic compounds which have a structure similar to clays.…”