铜铁氧体法处理模拟染料废水

Treating Simulated Dye Wastewater by an In Situ Copper Ferrite Process

探讨了不同反应条件对铜铁氧体法(in situ copper ferrite process)处理亚甲基蓝、结晶紫、刚果红和酒石黄这4种不同模拟染料废水的效果,并以亚甲基蓝模拟染料废水为例,研究了铁氧体法处理染料废水的反应热力学和生成沉淀物的物理化学性质,提出了铜铁氧体法处理模拟染料废水的主要机制.结果表明,通过调节铜铁氧体法的反应条件对4种模拟染料废水均可取得良好的处理效果.在c(Cu2+)=0.01 mol·L-1,c(Fe2+)=0.025 mol·L-1,c(OH)/c(M)=1.7(投加的氢氧根离子与金属的摩尔比),T=40℃,t=60 min的条件下,铜铁氧体法对亚甲基蓝、酒石黄、结晶紫、刚果红这4种模拟染料废水的最大处理能力分别达到349.2、382.2、402.5、831.8 mg·g-1.铜铁氧体法处理模拟染料废水的机制主要是高活性的新生态Fe-Cu沉淀物对染料分子的高效吸附和在沉淀物聚集过程中的卷扫、包裹作用.沉淀物通过磁分离、分解提纯、高温煅烧可生成铜铁氧体晶体材料回收利用.

Four types of simulated dye wastewater containing methylene blue,tartrazine,Congo red,and crystal violet were treated by an in situ copper ferrite process,and the influencing factors of the operational parameters in this process were studied. The main mechanism of dye removal was suggested by reaction thermodynamics and solid products characterization for methylene blue removal.The results showed that an in situ copper ferrite process could effectively remove four kinds of simulated dyes by adjusting reaction conditions appropriately. The maximum capacities of the in situ copper ferrite process for methylene blue,crystal violet,tartrazine,and Congo red were 349. 2,382. 2,402. 5 and 831. 8 mg·g-1,respectively,under reaction condition of c（Cu^2＋） of 0. 01 mol·L^-1,c（Fe^2＋） of 0. 025 mol·L^-1,c（OH）/c（M） = 1. 7（hydroxyl and metal molar ratio）,reaction temperature of 40℃,and reaction time of 60 min. Comprehensive physical interactions,including a sweeping effect,encapsulation,and high active surface adsorption of the in situ Fe-Cu precipitates were the dominant mechanisms in dye removal by the process. Copper ferrite,as an effective magnetic adsorbent and a highly efficient environmental catalyst,was regenerated by magnetic separation, catalytic oxidation, and high temperature calcination.