Natural product based composite for extraction of arsenic (III) from waste water

Abstract

Natural based composites of hydroxyapatite/Gum Arabic designed for removal of toxic metal arsenic (III) from waste water were synthesized and evaluated. Several composites with various compositions were prepared by the wet chemical method and analyzed using various spectroscopic and analytical methods such as: Fourier transform infrared spectroscopy, total organic carbon production, XRD analysis and scanning electron microscope. The rates of weight loss and water absorption of the HAp/GA composites as a function of time were evaluated in phosphate-buffered saline solution at 37 °C and a pH of 7.4. The effects of several variables on adsorption of arsenic (III) by HAp/GA composites were evaluated. The variables include arsenic (III) concentration, contact time (t) and complex surface nature of HAp/GA composite. Three surface complexation models were used to study the mechanisms controlled the adsorption. The models were Langmuir, Freundlich and Dubinin Radushkevich. The adsorption kinetic of arsenic (III) on the composite surface was described by three modes: pseudo first order, pseudo second order and the intra particle diffusion. The results revealed that, the rate of adsorption of arsenic (III) by HAp/GA composites was controlled by two main factors: the initial concentration of arsenic (III) and the contact time. The kinetic studies also showed that, the rate of adsorption is a second order. The results indicate that, composite offered in this study could be a valuable tool for removing toxic metals for contaminated water by adsorption.Graphical abstract.

La eliminación de metales tóxicos presentes en efluentes líquidos mediante resinas de cambio iónico. Parte VIII: Arsénico(III))/OH-/Dowex 1x8

“…In the 20 °C-60 °C temperature range, the experimental data fit well with the pseudo-second order kinetic model (Akartasse et al, 2017…”

Arsenic (III) removal from water by hydroxyapatite‐bentonite clay‐nanocrystalline cellulose

“…The theoretical background of these adsorption models are described by many authors in Refs. [19,[40][41][42][43][44][45]]. Langmuir isotherm model is the very simple empirical model.…”

“…There is evidence that the addition of a small amount fraction of nanocellulose (<5%) in nanocomposite results a significantly stronger mechanical performance compared with an unreinforced matrix [18]. The choice of hydroxyapatite as adsorbent is motivated by well-defined monomeric active species can be immobilized on their surface based on exchange ability and adsorption capacity [19][20][21][22][23][24][25][26]. Clays are excellent adsorbent materials due to the high specific surface area, chemical and mechanical stability, layered structure and high cation exchange capacity have made [11,27,28].…”

Effects of Gum Arabic-Coated Magnetite Nanoparticles on the Removal of Pb Ions from Aqueous Solutions

“…This is because it becomes biocompatible and stabilized in nanostructures [7]. Recently, GA has been investigated by in vitro and in vivo studies for coating and increasing biocompatibility of magnetic nanoparticles of iron oxide NPs [15], gold NPs [16], carbon nanotubes [17], and quantum dot nanocolloids [18].…”