磁性Ca/Al水滑石对活性艳红X-3B吸附的响应曲面法优化

Optimization of Magnetic Ca/Al Layered Double Hydroxides on Adsorption of Reactive Brilliant Red X-3Bby Response Surface Methodology

采用超声辅助法以超顺磁性铁氧体材料对制备的Ca/Al水滑石进行复合改性合成磁性Ca/Al水滑石,并研究其对活性艳红X-3B模拟染料废水的吸附性能。考察了磁性Ca/Al水滑石吸附剂剂量、吸附时间和初始pH值对活性艳红X-3B染料废水脱色效果的影响,采用Design-Expert软件对吸附条件进行了Box-Behnken响应曲面法优化。实验结果表明:当吸附剂剂量为7.6g/L,吸附时间为32.3min,初始pH值为6.9时,该材料对活性艳红X-3B染料的理论最大脱色率为94.2%.由于材料自身的磁性特性,吸附后的悬浊液在外加磁场的作用下,能够实现磁性水滑石的快速回收。同时,对回收再生磁性Ca/Al水滑石的吸附性能进行了研究,发现在吸附-解吸3次循环后仍然有很好的脱色效果,表明该磁性Ca/Al水滑石是一种极具潜力的新型染料吸附剂。

Ultrasound-assisted method was used to synthesize magnetic Ca/Al layered double hydroxides,and decoloration efficiency of reactive brilliant red X-3B simulated dye wastewater was studied.The effect of adsorbent dosage,adsorption time,and initial pH was investigated on the decolorization efficiency of reactive brilliant red X-3B dye wastewater,and the Box-Behnken response surface methodology(RSM)was used to optimize the adsorption conditions.The experimental results show that when the adsorbent dosage is 7.6 g/L,the adsorption time is 32.3 min and the initial pH is 6.9,the theoretical maximum decolorization rate of the reactive brilliant red X-3B is 94.2%.Owing to the magnetic characteristics of the material,after adsorption,magnetic Ca/Al layered double hydroxides can be quickly recovered from the suspension in an externed magnetic field.Meanwhile,the adsorption property of regenerated magnetic Ca/Al layered double hydroxides was studied.After 3 adsorption-desorption cycles the matenial still had a good decoloration efficiency,indicating that the magnetic Ca/Al hydrotalcite is a potential new type of dye adsorbent.