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Brick made by craftsmen in Central African Republic was treated at 50°C and 90°C with a 6M solution of hydrochloride acid for different time lengths. Total chemical compositions of leached samples were determined by ICP- AES and their chemical, mineralogical and morphological/textural properties were characterized by using an environmental scanning electron microscope equipped with an energy dispersive X-ray spectrometer, 27 Al solid-state MAS NMR spectrometry, N2 adsorption - desorption (BET) method. The acid-modified brick was found to possess a higher surface area as a result of structural and compositional collapses with significant Fe an Al losses which reached up to 85 wt.% for Fe and 55 wt.% for Al. Pore size distributions had allowed us to show the predominance of mesoporous structures with roughly two pore-diameter maxima at 7.6 nm and 14.6 nm. Higher surface acidity was also detected on HCl-treated brick pellets, indicating the generation of Bronsted and/or Lewis acid sites on their surfaces; These acid centers were evidenced by 1 H-MAS NMR spectrometry and also by FT-IR using pyridine as a probe molecule. The quantification of these acid sites was performed firstly by pHmetry with a NaOH solution under a strictly controlled N2 atmosphere, and secondly by adsorption - desorption studies of pyridine versus temperature using ThermoGravimetric (TGA)/Differential Thermal (DTA) analyses and TGA coupled to Mass spectrometry. The acid treatment of brick led to a higher surface area mesoporous material that was used in the present work as an adsorbent for removing Fe 2+ ions from aqueous solutions after deposition of iron oxy-hydroxides. The efficiency of this new composite was confirmed in the laboratory by carrying out fixed-bed column experiments.

Acid Treatment of Crushed Brick (from Central African Republic) and its Ability (After FeOOH Coating) to Adsorb Ferrous Ions from Aqueous Solutions