Graphene oxide (GO) has been a promising adsorbent to remove dyes, heavy metals and other pollutants from aqueous solutions, due to its huge surface area and rich oxygenic groups. However, one of the major application challenges is the agglomeration of GO layers which greatly affect its adsorption capacity and recycle performance. In this paper, a novel hollowed-out Si microsphere encapsulated by GO layers was developed as a strong and reusable absorbent. Hollowed-out Si microsphere with a dendritic structure was obtained from micron Al–Si alloy powder via acid treatment. Then it can be encapsulated by GO layers via a hydrogen bonding interaction between oxygenic groups from GO and Si–OH/Al–OH from porous Si skeleton. The designed absorbent has excellent adsorption ability for methylene blue and heavy metal ions resulting from the large surface area and oxygen functional groups of unrolled GO sheets. Meanwhile, it shows good reusability for pollutants owing to the spread of GO sheets on the Si skeleton surface which could prevents the aggregation of GO during adsorption process.

氧化石墨烯（GO）由于其巨大的表面积和丰富的含氧基团，一直是一种有望从水溶液中去除染料，重金属和其他污染物的吸附剂。然而，主要的应用挑战之一是GO层的团聚，这极大地影响了GO的吸附能力和再循环性能。在本文中，GO层封装的新型空心硅微球被开发为一种坚固且可重复使用的吸收剂。通过酸处理从微米级的Al-Si合金粉末中获得了具有树枝状结构的空心Si微球。然后，它可以通过GO的氧基团与多孔Si骨架的Si-OH / Al-OH之间的氢键相互作用被GO层封装。设计的吸收剂对亚甲基蓝和重金属离子具有出色的吸附能力，这是由于展开的GO片材的大表面积和氧官能团导致的。同时，由于GO片在Si骨架表面上的扩散，对污染物具有良好的可重复使用性，可以防止GO在吸附过程中聚集。