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Fe~(3+)进行配位反应,制备了柠檬酸改性甜菜粕纤维铁配合物(CDSBP-Fe)。通过FTIR、XRD和SEM对配合物表面形貌和化学结构进行了表征。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,考察了其催化性能。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Fe~(3+)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%;在pH=3~9时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。
To use sugar beet pulp as high-effective catalyst for the degradation of dye wastewater,depectinizedsugar beet pulp(DSBP) was modified using citric acid to introduce the carboxyl groups.Subsequently, the obtained citric acid-esterification sugar beet pulp fiber(CDSBP) was coordinated with Fe~(3+) ions to produce carboxylic fiber iron complex(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 showed that the carboxyl groups were introduced into the surface of the fiber by esterification reaction and coordinated with Fe~(3+) ions. Under the condition of light radiation, CDSBP-Fe could promote the degradation of azo dyes. The degradation rate was up to 95% after 25 min of reaction. CDSBP-Fe showed good activity at pH range from 3 to 9. Additionally, the activity of CDSBP-Fe was not decreased after five successive runs.
引文
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