8-羟基喹啉改性膨润土处理印染废水研究

Study on treatment of dyeing and printing wastewater with 8-hydroxyquinoline-modified bentonite

脱色是印染废水处理的一个重要问题.采用8-羟基喹啉对膨润土进行有机改性,制备了新型有机改性膨润土,并对影响印染废水脱色率的因素进行了研究,结果表明:pH值3.5、改性土7 g/L、125 r/min搅拌20 min、沉淀时间70 min时,改性土对直接耐晒翠蓝和酸性橙红染料模拟废水的脱色率可达94.1%和74.4%,对直接耐晒翠蓝的吸附符合准二级速率方程,更适于直接耐晒翠蓝染料的脱色.

An important problem in dyeing and printing wastewater treatment is to remove its color.A new type of organic modified bentonite was prepared using 8-hydroxyquinoline as modifier.The factors affecting decolorization rate of dyeing and printing wastewater was studied and the results showed that：pH was 3.5,7 g/L of bentonite,stirred at 125 r/min for 20 min,centrifugation time was 70 min.The modified bentonite was used to treat the direct sunfast turquoise blue and the acid orange-red dye and the decolorization rate were 94.1% and 74.4%,respectively.Adsorption process of modified bentonite to direct sunfast turquoise blue accorded with quasi-second order rate equations.The modified bentonite was suitable for the decolorization of direct sunfast turquoise blue dye.