酯化改性甜菜粕铁配合物的制备及其催化性能

Preparation of the ferric complex of esterification sugar beet pulp fiber and its their catalytic performance

摘要:

为使用低成本甜菜粕作高效催化剂降解染料废水，使用柠檬酸对脱果胶甜菜粕(DSBP)进行改性以引入羧酸基，然后将酯化改性甜菜粕(CDSBP)与Fe3+进行配位反应制备柠檬酸改性甜菜粕纤维铁配合物(CDSBP-Fe)。通过傅里叶变换红外光谱、X-射线衍射和扫描电镜对配合物表面形貌和化学结构进行表征。将CDSBP-Fe作为非均相Fenton反应光催化剂，用于活性红195染料的降解反应，考察其催化性能。结果表明，通过酯化反应羧酸基被成功引入纤维表面结构，并与Fe3+进行配位反应制备了羧酸纤维铁配合物。在光辐射条件下，CDSBP-Fe能够促进偶氮染料的降解反应，反应25 min时，染料脱色率已达到95.6%；在pH为3~9范围内CDSBP-Fe均具有较好活性，且CDSBP-Fe循环5次使用活性也未明显降低。

Abstract:

To use sugar beet pulp as a high-effective catalyst for the degradation of dye wastewater, de–pectinated sugar beet pulp(DSBP) was modified using citric acid to introduce the carboxyl groups, citric acid-esterification sugar beet pulp fiber (CDSBP) was coordinated with Fe3+ ions to produce carboxylic fiber Fe(CDSBP-Fe). The surface morphology and chemical structure were characterized by FTIR, XRD, and SEM. Then, the catalytic performance of CDSBP-Fe was evaluated as heterogeneous light Fenton catalysts for oxidative degradation of reactive red 195. The results show that the carboxyl groups have been introduced into surface structure of fiber by ester linkage with citric acid and coordinated with Fe3+ ions to prepare carboxylic fiber Fe. The degradation of azo dye was significantly accelerated by the presence of CDSBP-Fe under visible irradiation, and the degradation rate was up to 95.6% after 25 min; CDSBP-Fe showed good degradation performance in the pH range of 3~9. Additionally, no significant catalyst deactivation was noted after five succesive runs.