A metakaolinite-containing brick made by craftsmen in Central African Republic was treated with sodium hydroxide at 90 °C. After metakaolinite dissolution, gel state Na - aluminosilicates were initially formed and impregnated the surfaces of no-attacked brick grains (mainly sand). This gel changed progressively with time into crystal seeds at remaining brick surfaces. The generation of ‘low silica’ zeolites (NaA and NaP) with molar Si/Al ratios close to 1 was evidenced by the ESEM/EDS technique and their pore size distribution by using N₂ adsorption-desorption isotherm at 77 K. ²⁷Al and ²⁹Si MAS NMR spectra of alkali-brick samples were recorded for studying their evolution with NaOH-reagent level and for characterizing newly-generated zeolitic materials in which Si and Al atoms are identified in the classification of alumino-silicates by the coordination number of the central silicon atom and the number of Si and Al second neighbors used. ²⁷Al MQ (multiple quantum) MAS NMR was employed to study the aluminum coordination in synthesized zeolites. ²³Na and ¹H MAS NMR measurements were performed on alkali brick for evidencing the abundance of hydrated Na⁺ ions associated with negatively charged brick sites. After checking in the future the ability of zeolitized brick in the removal of heavy metals from wastewaters, this new composite should be of great interest in water treatments at low cost in Central African Republic.

由中非共和国工匠生产的含偏高岭土的砖块在90°C下用氢氧化钠处理。偏高岭石溶解后，最初形成凝胶态的Na-铝硅酸盐，并浸渍了未受攻击的砖颗粒（主要是沙子）的表面。随着时间的流逝，这种凝胶逐渐变成残留在砖块表面的晶种。ESEM / EDS技术证明了Si / Al摩尔比接近1的“低硅”沸石（NaA和NaP）的生成及其在77 K. ²⁷ Al和²⁷ N下的N ₂吸附-解吸等温线的孔径分布。²⁹记录了碱砖样品的Si MAS NMR光谱，以研究其在NaOH试剂水平下的演化以及表征新生沸石材料的特征，其中硅和Al原子通过中心配位数在硅铝酸盐的分类中被识别出硅原子以及所使用的第二和第二相邻硅和铝的数量。²⁷ Al MQ（多量子）MAS NMR用于研究合成沸石中的铝配位。在碱砖上进行了²³ Na和¹ H MAS NMR测量，以证明水合Na ⁺的丰度与带负电的砖位有关的离子。在将来检查了沸石砖在去除废水中重金属的能力之后，这种新的复合材料在中非共和国的低成本水处理中应该引起极大的兴趣。