Hierarchical bristle-grass-like NH₄Al(OH)₂CO₃@Ni(OH)₂ core-shell structure is fabricated through a simple hydrothermal approach combined with subsequent chemical bath deposition. Electron microscopy characterization reveals that the ammonium aluminum carbonate hydroxide (NH₄Al(OH)₂CO₃) microfibers were uniformly covered with interconnected and vertically aligned nickel(II) hydroxide (Ni(OH)₂) nanosheets, forming hierarchical pore structure. The NH₄Al(OH)₂CO₃ microfibers not only serve as substrate for the growth of the Ni(OH)₂ nanosheets but also prevent the nanosheets from aggregating. The synthesized hierarchical bristle-grass-like NH₄Al(OH)₂CO₃@Ni(OH)₂ composite showed excellent adsorption performance toward Congo red (CR), which was superior to the aggregated Ni(OH)₂ microspheres and the bare NH₄Al(OH)₂CO₃ microfibers. The adsorption isotherm can be well described by the Langmuir model, with an estimated maximum adsorption capacity of 426 mg g⁻¹ for the NH₄Al(OH)₂CO₃@Ni(OH)₂ composite. The major adsorption mechanism is electrostatic interaction between the CR molecules with negative charge and the positively charged sample surface of the Ni(OH)₂ nanosheets at neutral pH. The as-prepared NH₄Al(OH)₂CO₃@Ni(OH)₂ core-shell microfibers can be expected to act as potential materials for CR removal in purification of wastewater.

通过简单的水热方法与随后的化学浴沉积相结合，制备出了类似刷毛草状的NH ₄ Al（OH）₂ CO ₃ @Ni（OH）₂核-壳结构。电子显微镜表征表明，碳酸氢铵铝（NH ₄ Al（OH）₂ CO ₃）微纤维均匀地覆盖有相互连接且垂直排列的氢氧化镍（II）（Ni（OH）₂）纳米片，形成分层的孔结构。NH ₄ Al（OH）₂ CO ₃超细纤维不仅充当Ni（OH）₂生长的基质纳米片，但也防止纳米片聚集。合成的层状猪鬃状NH ₄ Al（OH）₂ CO ₃ @Ni（OH）₂复合材料表现出对刚果红（CR）的优异吸附性能，优于聚集的Ni（OH）₂微球和裸露的NH ₄ Al（OH）₂ CO ₃超细纤维。吸附等温线可以用Langmuir模型很好地描述，对NH ₄ Al（OH）₂ CO ₃ @Ni（OH）₂的估计最大吸附容量为426 mg g ^-1合成的。主要的吸附机理是在中性pH下带负电荷的CR分子与Ni（OH）₂纳米片的带正电的样品表面之间的静电相互作用。预期制备的NH ₄ Al（OH）₂ CO ₃ @Ni（OH）₂核-壳微纤维可作为废水净化中CR去除的潜在材料。