物理超声改性膨润土吸附结晶紫染料的性能研究

Adsorption of crystal violet dye by physical ultrasonic modified bentonite

为避免化学改性膨润土消耗大量化学试剂和二次污染,利用超声波对钙基膨润土进行改性得到超声钙基膨润土吸附材料,并将其用于吸附处理结晶紫模拟的染料废水。考察了超声制备工艺条件对吸附材料吸附性能的影响,并对其吸附机制及吸附热力学进行了研究。结果表明,在超声功率为100 W,超声时间为7 h的条件下制备得到的改性膨润土吸附效果最佳,对250 mg/L的结晶紫去除率达99.64%,吸附量达249.09 mg/g;准二级动力学方程和Langmuir等温吸附方程更适合描述该吸附机制,即对结晶紫的吸附主要是由化学吸附控制的单分子层吸附为主;热力学分析表明该吸附为自发吸热过程,高温对吸附更有利。

To avoid the consumption of massive chemical reagents and secondary pollution when preparing chemica-lly modified bentonite,bentonite was modified by ultrasonic wave to obtain ultrasonic calcium bentonite adsorption material,which was used to treat the simulated dye wastewater of crystal violet.The effects of ultrasonic preparation conditions on the adsorption properties of the adsorbents were investigated,and the adsorption mechanism and ther-modynamics were studied.The results showed that the modified bentonite with ultrasonic power 100 W and ultrasonic time 7 h had better adsorption effect,and the removal rate and adsorption capacity reached 99.64%and 249.09 mg/g respectively when the concentration of crystal violet was 250 mg/L;the pseudo-second order kinetic equation and la-ngmuir isotherm adsorption equation were more suitable to describe the adsorption behavior mechanism and the crys-tal violet molecule is adsorbed on a single layer by chemical action;thermodynamic analysis showed that the adsorp-tion was spontaneous endothermic process,high temperature was more beneficial to adsorption.