A novel citrate-crosslinked Zn-MOF/chitosan (ZnBDC/CSC) composite was successfully prepared by immobilizing Zn-MOF (ZnBDC) on citrate-crosslinked chitosan (CSC) using citric acid as a chemical bridge. ZnBDC/CSC was characterized by XRD, FT-IR, solid-state ¹³C NMR, BET and SEM. The adsorption of ZnBDC/CSC for Cr(VI) and MO from aqueous solutions were studied at pH 5.0. The adsorption conditions, such as adsorption time and initial concentration of Cr(VI) and MO solutions were investigated. The results indicated that ZnBDC/CSC showed high adsorption capacity for both Cr(VI) (225 ± 4 mg g⁻¹) and MO (202 ± 3 mg g⁻¹), respectively. The adsorption of Cr(VI) on ZnBDC/CSC could be well described by Langmuir isotherm model, while MO followed Freundlich model. The adsorption kinetic of Cr(VI) and MO demonstrated a better fitness to the pseudo-second order kinetic model. Thermodynamic parameters (enthalpy (ΔH), entropy (ΔS) and Gibbs free energy (ΔG)) demonstrated that the adsorption processes of Cr(VI) and MO on ZnBDC/CSC were exothermic, disordered and spontaneous at 298−318 K. The adsorption mechanism of ZnBDC/CSC for Cr(VI) could be mainly explained by electrostatic attraction and cation-π interaction, while for MO, it could be assigned to n-π and π-π interactions, electrostatic attraction and hydrogen bonding. ZnBDC/CSC could be recycled and reused for the removal of Cr(VI) and MO.

以柠檬酸为化学桥，将Zn-MOF（ZnBDC）固定在柠檬酸交联的壳聚糖（CSC）上，成功制备了新型柠檬酸酯交联的Zn-MOF /壳聚糖（ZnBDC / CSC）复合材料。ZnBDC / CSC用XRD，FT-IR，固态¹³ C NMR，BET和SEM表征。在pH 5.0的条件下研究了ZnBDC / CSC对水溶液中Cr（VI）和MO的吸附。研究了Cr（VI）和MO溶液的吸附时间，初始浓度等吸附条件。结果表明，ZnBDC / CSC对Cr（VI）（225±4 mg g ^-1）和MO（202±3 mg g ^-1）均具有高吸附能力。）， 分别。Langmuir等温模型可以很好地描述Cr（VI）在ZnBDC / CSC上的吸附，而MO遵循Freundlich模型。Cr（VI）和MO的吸附动力学表现出对拟二级动力学模型更好的适应性。热力学参数（焓（ΔH），熵（ΔS）和吉布斯自由能（ΔG））表明，Cr（VI）和MO在ZnBDC / CSC上的吸附过程在298-318 K时是放热的，无序的和自发的。ZnBDC / CSC的机理对于Cr（VI）来说，主要可以通过静电吸引和阳离子-π相互作用来解释，而对于MO，可以将其分配给n-π和π-π相互作用，静电吸引和氢键。ZnBDC / CSC可以回收再利用，以去除Cr（VI）和MO。