Synthesis of Mesoporous Lanthanum Phosphate and Its Use as a Novel Sorbent

Abstract

Mesoporous lanthanum phosphate was synthesized by supramolecular self-assembly of cetyltrimethylammonium bromide and lanthanum nitrate following digestion in phosphoric acid. TGA-DTA, XRD and SEM were employed to study the uncalcined and calcined materials. Sorption behavior of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Ba(II), Hg(II) and Pb(II) cations was studied on such materials in water, 3 mol•L -1 ammonia, 0.01 mol•L -1 potassium ferrocyanide and 0.01 mol•L -1 potassium ferricyanide solutions.

Adsorption Studies of Radionuclides and Toxic Metal Ions on a Modified Mesoporous Lanthanum(III) Silicate

“…Table 1 shows the specific surface area, pore volume and pore diameter of the unmodified and modified adsorbents. The comparison of surface area, pore volume of modified mesoporous lanthanum(III) silicates and mesoporous lanthanum silicate reported earlier, 14 shows that surface area (918 against 100 m 2 /g) and pore volume (1.01 against 0.32 cm 3 /g) have been increased. The SEM image of mesoporous La40MCM-41 is shown in Figure 3.…”

“…The comparison of percent adsorption of toxic metal ions on modified mesoporous lanthanum(III) silicate and mesoporous lanthanum silicate reported earlier, 14 ( Table 3) shows the high sorption of Fe(III), Pb(II), Cu(II), Ba(II), Cd(II), Ni(II) and Zn(II) on modified mesoporous lanthanum(III) silicates, which seems more selective. The utility of this adsorbent has been demonstrated by achieving separations of great analytical significance.…”

“…11,12 Recently mesoporous lanthanum silicate has been employed as catalyst for oxidation of styrene 13 and as adsorbent for sorption of toxic metal ions. 14 In this paper, we report the synthesis of mesoporous lanthanum(III) silicate with different molar ratio of Si/La in nonhydrothermal condition. Their properties, and adsorption of 24 radionuclides and toxic metal ions on these adsorbents have been studied.…”

Nanoporous Lanthanum Tungstate: A Viable Adsorbent for Heavy Metals and Organic Pollutants

“…14,15 In the past few years, there has been increasing interest in developing inorganic adsorbents, particularly for the efficient removal of organic pollutants from aqueous solutions. 16 Modified clays 17,21 and layered double hydroxides (LDH) 22 have drawn attention as promising adsorbents. Mesoporous silicas have been also used for the adsorption of organic substances.…”

Highly efficient adsorption of hexavalent chromium from the aqueous system using nanoporous carbon modified with tetraethylenepentamine

“…Consequently, it is important to develop effective adsorbents with short adsorption equilibrium time for the removal of toxic compounds from aqueous solutions. Recent researches show that mesoporous materials (Anbia and Mohammadi 2009a, b;Anbia and Mandegarzad 2012;Anbia and Ghaffari 2009;Anbia et al 2006) can have good selectivity, large adsorption capacity, and improved recoverability for the removal of toxic species from aqueous solutions. Ordered mesoporous materials such as MCM-48, SBA-15, MCM-41, CMK-1, and CMK-3 have attracted much attention owing to their special properties, such as regular framework, high surface area, and narrow pore size distribution.…”