采用机械活化协同FeCl₃对纤维素进行预处理，通过离子交换法及聚多巴胺（PDA）修饰制备纤维素/海藻酸铁@PDA复合凝胶球并作为催化剂应用于光催化还原Cr⁶⁺。通过SEM、比表面积及孔隙度、抗压强度以及UV-Vis-NIR等对凝胶球的稳定性以及可见光吸收性能进行表征，考察溶液初始pH、质量浓度以及催化剂质量浓度对光催化还原Cr⁶⁺的影响。结果表明，纤维素/海藻酸铁@PDA凝胶球为多孔网状结构，具有优异的抗压性能以及可见光吸收能力。在pH为3、初始质量浓度为20 mg/L、催化剂质量浓度为1.5 g/L的条件下，凝胶球对Cr⁶⁺的催化还原效果最佳，去除率可达94%以上，且主要的活性还原物质是·CO₂^-。

Cellulose is pretreated collaboratively by mechanical activation and FeCl₃.Ion exchange method and polydopamine (PDA) modification are adopted to prepare cellulose/ferric alginate@PDA composite gel beads, which are used as catalyst for the pthotocatalytic reduction of Cr⁶⁺.The stability and visible light absorption properties of the gel beads are characterized by SEM, specific surface area, porosity analysis, compressive strength, and UV-vis-NIR.The effects of the initial pH of solution, Cr⁶⁺ concentration, and catalyst dosage on the photocatalytic reduction of Cr⁶⁺ are investigated.The results show that cellulose/ferric alginate@PDA exhibits a porous network structure with excellent compressive resistance and visible light absorption ability.The prepared gel beads exhibits the optimal catalytic performance for the reduction of Cr⁶⁺ under the conditions that pH=3, initial Cr⁶⁺ concentration is 20 mg·L^-1, and catalyst dosage is 1.5 g·L^-1.The removal efficiency of Cr⁶⁺ can exceed 94%, and the main active reducer is ·CO₂.

王雯(1995-),女,硕士研究生,研究方向为污水处理,1511071695@qq.com