A novel process for the fabrication of nanoporous apatites from Moroccan phosphate rock

Pyridine and phenol removal using natural and synthetic apatites as low cost sorbents: Influence of porosity and surface interactions

“…7 wt% organics [22]. c-HAp was synthesized from phosphate rock by a dissolution-precipitation method recently described that provides a simple and economic route for synthesis of mesoporous apatite powders [23]. p-HAp was obtained by a chemical neutralization method from Ca(OH) 2 and NH 4 H 2 PO 4 as described elsewhere [24][25].…”

“…Based on these data, it was possible to discuss the relative contribution of sorbent struc-0304-3894/$ -see front matter © 2010 Elsevier B.V. All rights reserved. doi:10.1016/j.jhazmat.2010.05.074 Table 1 Chemical and textural characteristics (specific surface area SBET and average pore size Dp) of three adsorbents [22][23][24]. ture and sorbent-pollutant interactions on the efficiency of the removal process.…”

Nanoscale conversion of chlorapatite into hydroxyapatite using ultrasound irradiation

“…The conversion of the natural ore into nanosized powders was performed according to a previously described procedure [23]. The overall flow diagram of the process is summarized in Figure 1.…”

“…Of particular interest here are sonochemistry routes that allow control of the particle size and crystallinity through the modulation of irradiation power and duration [13][14][15][16][17][18][19][20][21]. As a more sustainable alternative, a process allowing for the conversion of natural phosphate into porous hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ) was recently described [22,23]. The procedure involves the dissolution of the natural ore in nitric acid, filtration of the remaining minerals (mainly quartz) and reprecipitation by neutralization.…”

Advances of nanotechnology in agro-environmental studies

“…Contaminant sequestration is achieved by surface complexation or encapsulation in interior interfaces of NP aggregates (Lü et al, 2007;Tungittiplakorn et al, 2005) that can also be used for groundwater cleanup and remediation. In particular, copper oxide (CuO) NPs have been used for As III and V adsorption (Martinson and Reddy, 2009), zero valent iron NPs for remediation of organic pollutants (Ponder et al, 2001), nanoporous apatite for removal of radionuclides and contaminants (El Asria et al, 2009).…”