ZnO–AlOOH nanoflakes assembled in flower-like structures were produced through a simple hydrothermal route. The flower-like ZnO–AlOOH composites were used as adsorbents to remove Congo Red (CR) dye from aqueous solution and compared with pure AlOOH and ZnO adsorbents. The adsorption kinetics of the dye on the synthesised samples was described by a pseudo-second-order model. The equilibrium adsorption data of CR on the ZnO–AlOOH samples fitted well with the Langmuir model. The ZnO–AlOOH samples possessed excellent adsorption capacity (524 mg/g), which was higher than those of pure AlOOH and ZnO samples. The superior CR removal efficiency of the ZnO-AlOOH samples could be attributed to their hierarchical porous structures and high specific surface areas, which are conducive to the diffusion and adsorption of the CR molecules.

中文翻译：

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分层多孔花状ZnO-AlOOH结构的合成及其在刚果红吸附中的应用

ZnO-AlOOH纳米片以类似花的结构组装而成，是通过简单的水热途径生产的。花状ZnO-AlOOH复合材料用作吸附剂，用于从水溶液中去除刚果红（CR）染料，并与纯AlOOH和ZnO吸附剂进行了比较。用伪二级模型描述了染料在合成样品上的吸附动力学。ZnO–AlOOH样品上CR的平衡吸附数据与Langmuir模型非常吻合。ZnO–AlOOH样品具有优异的吸附容量（524 mg / g），高于纯AlOOH和ZnO样品的吸附容量。ZnO-AlOOH样品优异的CR去除效率可归因于其分层的多孔结构和高比表面积，这有利于CR分子的扩散和吸附。