The amorphous silica with the extended surface area was fabricated for the methylene blue (MB) adsorption. In the first step, the zeolite compounds were produced hydrothermally from the transformation of a low grade kaolin, containing quartz by changing NaOH concentration, temperature, and reaction time based on the central composite design method (CCD). In the second step, the mesoporous silica powders were fabricated by the acid treatment of obtained zeolite compounds at 80 °C. Although quartz was deleted in the alkali concentrated solutions, > 4 mol L⁻¹, hydroxysodalite, and cancrinite mixtures were formed at the higher temperatures, and longer reaction times. The acidification of these mixtures led to the formation of silica powders with the unacceptable adsorption yield. The adsorptive performance of silica produced from the powder predominantly containing hydroxysodalite was comparable with those fabricated from the other zeolite compounds. The average pore size, and specific surface area of produced SiO₂ were 4.3 nm, and 637 m² g⁻¹ respectively, which provided a large number of functional groups in the surface of particles, leading to the strong affinity towards MB in the neutral condition with a maximal adsorption capacity of 135 mg g⁻¹. The used adsorbent can be thermally regenerated without significant losing the adsorption efficiency, which is of great importance from engineering view point. The convenient fabrication from an inexpensive resource according to a template-free route plus reusability facilitate the application of obtained silica in the treatment of wastewaters contaminated with the cationic dyes.

制备具有扩大的表面积的无定形二氧化硅以吸附亚甲基蓝（MB）。第一步，根据中心复合设计方法（CCD），通过改变NaOH的浓度，温度和反应时间，通过对含有石英的低级高岭土的转化进行水热法生产沸石化合物。在第二步骤中，通过在80℃下酸处理所获得的沸石化合物来制备中孔二氧化硅粉末。尽管在碱浓缩溶液中删除了石英，但> 4 mol L ^-1在较高的温度和较长的反应时间下会生成，，，，，这些混合物的酸化导致形成二氧化硅粉末，其吸附产率不可接受。由主要含有羟基钠钙石的粉末生产的二氧化硅的吸附性能与由其他沸石化合物制备的二氧化硅的吸附性能相当。产生的SiO ₂的平均孔径和比表面积分别为4.3 nm和637 m ²  g ^-1，这在颗粒表面提供了许多官能团，从而导致了对中性离子对MB的强亲和力最大吸附容量为135 mg g ^-1的条件。所使用的吸附剂可以进行热再生而不会显着降低吸附效率，这从工程角度来看非常重要。根据廉价的资源，无需模板即可方便地进行制造，再加上可重复使用性，有助于将所得二氧化硅应用于处理被阳离子染料污染的废水。