Chitosan-coated fly ash (CWF) was prepared by the acid leaching-coating method. Chitosan and fly ash were crosslinked in the solution of acetic acid and sulfuric acid. The microstructure of CWF was conducted by scanning electron microscope (SEM) and X-ray diffraction (XRD). The removal of Cr(VI) from water by CWF was studied by adsorption experiments. The composite prepared by the experiment developed a pore structure and a crystal structure similar to SiO₂ and chitosan chain-like coating was formed on the surface of fly ash. The new modified material has larger surface roughness, specific surface area and more adsorption channels. The Cr(VI) was enriched in modified materials by electrostatic adsorption between CrO₄²⁻, CrO₇²⁻ and —NH₃⁺ group and surface acid functional groups. The movement of Cr(VI) in solution is a diffusion process from the main body of the liquid phase to the surface of the liquid film.

采用酸浸包衣法制备壳聚糖包覆粉煤灰（CWF）。壳聚糖和粉煤灰在醋酸和硫酸溶液中交联。通过扫描电子显微镜 (SEM) 和 X 射线衍射 (XRD) 对 CWF 的微观结构进行了研究。通过吸附实验研究了 CWF 从水中去除 Cr(VI)。实验制备的复合材料形成了类似于SiO ₂的孔结构和晶体结构，并在粉煤灰表面形成了壳聚糖链状涂层。新型改性材料具有更大的表面粗糙度、比表面积和更多的吸附通道。通过 CrO ₄ ^2-、CrO ₇ ^2-之间的静电吸附使 Cr(VI) 在改性材料中富集和-NH ₃ ⁺基团和表面酸官能团。Cr(VI)在溶液中的运动是从液相主体到液膜表面的扩散过程。