新型杂化絮凝剂PAC-PDMDAAC对染料废水的脱色光谱分析

用新型杂化絮凝剂聚合氯化铝-聚二甲基二烯丙基氯化铵(PAC-PDMDAAC)处理分散紫和活性艳红两种染料废水。杂化絮凝剂投药量为400和450 mg·L-1时，分散紫和活性艳红的脱色率分别达到99%和86.8%，优于聚合氯化铝(PAC)和复配型PAC-PDMDAAC。杂化絮凝剂处理分散紫的最佳pH为7～12，而处理活性艳红的最佳pH为7～9。分别对两种染料及其杂化絮体进行傅里叶红外光谱扫描，结果表明杂化絮凝剂与两种染料分子的某些基团有络合作用，杂化絮体中羟基峰增大且宽化，杂化絮凝剂对染料废水的脱色以吸附电中和为主。对染料原水以及混凝后上清液进行紫外连续扫描，两种上清液的吸光度都大大降低，同时吸收曲线波峰偏移，进一步说明电中和与吸附架桥的协同作用是脱色的主要机理。同时，杂化絮凝剂对分散紫的脱色是通过破坏醚键以及与—NH₂反应，而对活性艳红的脱色则是通过对—SO₃的置换以及对Cl-的取代。为该新型无机-有机高分子杂化絮凝剂混凝脱色效能及脱色机理研究提供新方法，具有实际意义和应用价值。

Spectral Analysis on the Decolorization of Dyeing Wastewater with PAC-PDMDAAC Hybrid Flocculant

The new hybrid flocculant polyaluminum chloride-poly (dimethyl diallyl ammonium chloride) (PAC-PDMDAAC) was used to treat disperse violet and reactive brilliant red dye wastewater. The experimental results indicated that the decolorization effect of hybrid PAC-PDMDAAC was better than that of PAC and composite PAC-PDMDAAC. The decolorization rates of disperse violet and reactive brilliant red dye wastewater were 99% and 86.8% respectively when the dosages of hybrid flocculant were 400 and 450 mg·L-1. When the pH of disperse violet wastewater was 7～12, the hybrid flocculant had the best decolorization effect. When the pH of reactive brilliant red wastewater was 7～9, the hybrid flocculant had the best decolorization effect. Each of the two dyes and their flocs were characterized with FTIR. Results showed that the hybrid flocculant had a complex reaction with the dye wastewater, and the main decolorization mechanism was charge neutralization and adsorption bridging capacity. The UV scanning results indicated an adsorption peaks shift and an absorbance decreases, which further explained the main mechanism above. At the same time, it also indicated the ether linkage and —NH₂ of disperse violet were destroyed and replaced by hybrid flocculant, and the -SO₃ , Cl- of reactive brilliant red were also replaced. The study will provide a new method in decolorization effiency and decolorization mechanism for the new inorganic-organic hybrid polymer flocculant. And it has significant practical meaning and application value.