利用三聚氰胺和碳酸钙成功合成了一种新型吸附剂CaCO3/g-C3N4。通过XRD，FT-IR，SEM，TEM和BET对CaCO3/g-C3N4的结构进行深入研究。实验结果表明: CaCO3/g-C3N4对结晶紫(CV)具有快速、高效的吸附性能(89.34%)和出色的吸附容量(1 209.75 mg/g)。CaCO3/g-C3N4对CV的吸附符合准二级动力学和Langmuir等温吸附模型。同时，基于吸附前后吸附剂的FT-IR和XPS分析，得出π-π堆积，n-π相互作用和氢键协同效应是CaCO3/g-C3N4选择性吸附CV的重要因素。

A new adsorbent CaCO3/g-C3N4 was successfully synthesized using melamine and calcium carbonate. The structure of CaCO3/g-C3N4 was studied in depth through XRD, FT-IR, SEM, TEM and BET. The experimental results show that CaCO3/g-C3N4 has fast and efficient selective adsorption performance (89.34%) and excellent adsorption capacity (1 209.75 mg/g) for crystal violet (CV). Adsorption kinetics and isotherms show that CaCO3/g-C3N4 adsorption of CV follows the quasi-second-order kinetic model and the Langmuir isotherm, respectively. At the same time, based on the FT-IR and XPS spectra before and after adsorption and experimental conclusions, a reasonable adsorption mechanism was proposed. The synergistic effects of π-π stacking, n-π interaction, and hydrogen bonding are important reasons for the selective adsorption of CV by the CaCO3/g-C3N4.