Microwave-hydrothermal method for the synthesis of composite materials for removal of arsenic from water

Abstract

Composite material Zr-doped TiO2, suitable for the removal of arsenic from water, was synthetized with fast and simple microwave-hydrothermal method. Obtained material, Zr-TiO2, had uniform size and composition with zirconium ions incorporated into crystal structure of titanium dioxide. Synthetized composite material had large specific surface area and well-developed micropore and mesopore structure that was responsible for fast adsorption of As(III) and As(V) from water. The influence of pH on the adsorption capacity of arsenic was studied. The kinetics and isotherm experiments were also performed. The treatment of natural water sample containing high concentration of arsenic with composite material Zr-TiO2 was efficient. The concentration of arsenic was reduced to the value recommended by WHO.

Hydrothermal Treatment of Arsenic Sulfide Residues from Arsenic-Bearing Acid Wastewater

“…Moreover, wasted electrolyte with a high concentration of arsenic is produced abundantly in copper and lead-zinc electrolyte processes [ 8 , 9 ]. At present, there are many treatment methods for arsenic-containing wastewater, such as precipitation, adsorption, and biological methods [ 10 , 11 , 12 , 13 , 14 ]. However, such wastewater is usually treated with sodium sulfide, sodium hydrosulfide or hydrogen sulfide to precipitate arsenic, and the deposition of arsenic sulfide residue (ASR) is then engendered [ 15 , 16 ].…”

Investigation of mechanism and critical parameters for removal of arsenic from water using Zr–TiO2 composite

“…The Zr-TiO2 composite was prepared according to the microwave-hydrothermal method described in detail in publication [19]. Briefly, TiCl4 was added to ice cooled deionized water (TiCl4:H2O(v/v) ratio 1:10) where homogeneous and transparent solution was obtained.…”

“…where α = 0.625 (calibration factor), T1=120 °C and T2=500 °C, NA is Avogadro's number and SBET(nm 2 g -1 ) is the BET surface area (SBET=114 m 2 /g, see [19]) and MwH2O is the molecular weight of water.…”

“…[17] A variety of materials were tested for arsenic removal, both natural and synthesized, whereby the efficiency of the sorbent followed the trend of the discovery of new materials synthesized by various techniques. [6,[18][19][20][21][22] Peng et al [23] recently synthetized, using controlled double-jet precipitation technique, magnetic Fe3O4@Cu(OH)2 composite, for the removal of As(V) from solution. Nanostructured iron(III)-copper(II) binary oxide [24] and iron-zirconium binary oxide [25], synthetized using simple precipitation method, showed promising results in batch removal studies which recommend these materials for column studies.. Andjelkovic et al [19] have demonstrated that using microwave-hydrothermal procedure for synthesis of bimetallic oxide, Zr-TiO2, a potentially good material for removal of arsenic from water was obtained.…”

“…[6,[18][19][20][21][22] Peng et al [23] recently synthetized, using controlled double-jet precipitation technique, magnetic Fe3O4@Cu(OH)2 composite, for the removal of As(V) from solution. Nanostructured iron(III)-copper(II) binary oxide [24] and iron-zirconium binary oxide [25], synthetized using simple precipitation method, showed promising results in batch removal studies which recommend these materials for column studies.. Andjelkovic et al [19] have demonstrated that using microwave-hydrothermal procedure for synthesis of bimetallic oxide, Zr-TiO2, a potentially good material for removal of arsenic from water was obtained. Titanium dioxide based materials are relatively well established materials for arsenic removal [17] while zirconium, as a doping element, was chosen based on its unique selectivity towards polyoxy anions and the fact that this element in its hydrated form can generate species which have abundant hydroxyl ions.…”