膨润土-钢渣复合颗粒制备及其对铜离子吸附

Preparation of bentonite-steel slag composite particles and copper ion adsorption

为改善粉体膨润土-钢渣成型条件,以钙基膨润土、钢渣为原料,借助海藻酸钠与氯化钙交联作用,制备复合吸附颗粒,并利用SEM-EDS、XRD等分析手段对复合吸附颗粒吸附后形貌及元素、物相进行了表征。通过静态吸附实验探究了复合吸附颗粒对Cu(Ⅱ)在不同土渣质量配比、投加量、pH、温度和初始浓度条件下吸附效果的影响。结果表明,在复合颗粒投加量为30 g/L,pH为5.2,初始Cu(Ⅱ)浓度为100 mg/L时,对Cu(Ⅱ)去除率达92.95%。复合颗粒对Cu(Ⅱ)吸附动力学符合拟一级动力学模型,吸附热力学符合Langmuir吸附等温模型,热力学相关参数表明,复合颗粒对Cu(Ⅱ)吸附是自发、吸热过程。

To improve the conditions of powder bentonite-steel slag forming,the composite adsorption particles were prepared from calcium-based bentonite and steel slag with the help of cross-linking of sodium alginate and calcium chloride.The post-adsorption morphology,elemental and physical phases of the composite particles were characterized by SEM-EDS and XRD analysis.The effect of composite adsorption particles on the adsorption of Cu(II)at different slag mass ratios,dosing amounts,pH,temperature and initial concentration was investigated by static adsorption experiments.The results showed that the removal rate of Cu(II)reached 92.95%at a compound particle dosage of 30 g/L,pH 5.2 and an initial Cu(II)concentration of 100 mg/L.The kinetics of Cu(II)adsorption by the composite particles is in accordance with the proposed first-order kinetic model,the adsorption thermodynamics is in accordance with the Langmuir adsorption isotherm model,and the thermodynamically relevant parameters indicate that the adsorption of Cu(II)by the composite particles is a spontaneous,heat-absorbing process.