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摘要:
利用赤泥基吸附剂对废水中重金属离子开展吸附特性研究，以酸性废水中Cu2+、Zn2+为研究对象，借助吸附动力学模型、吸附等温线、FTIR、XRD等手段探究了赤泥基吸附剂的吸附机理。结果表明：赤泥基吸附剂对重金属离子Cu2+、Zn2+的吸附过程属于单分子层吸附，Langmuir吸附等温线拟合得出吸附剂对Cu2+、Zn2+的最大吸附量分别为33.12 mg/g、129.88 mg/g，符合准二级动力学模型。赤泥基吸附剂中Si-O-Si键与Cu2+、Zn2+发生相互作用，吸附过程为化学吸附。该研究为铝工业固废赤泥的回收利用提供了新途径。
Abstract:The adsorption characteristics of heavy metal ions in wastewater were investigated by using red mud-based adsorbent. The adsorption mechanism of red mud-based adsorbent was investigated by means of adsorption kinetic model, adsorption isotherm, FTIR and XRD with Cu2+and Zn2+ in acidic wastewater as the target. The results showed that the adsorption process of heavy metal ions Cu2+ and Zn2+ by the red mud-based adsorbent belonged to monomolecular layer adsorption, and the maximum adsorption amounts of Cu2+ and Zn2+ by Langmuir adsorption isotherms were 33.12 mg/g and 129.88 mg/g, respectively, which were in accordance with the quasi-secondary kinetic model. The Si-O-Si in the red mud-based adsorbent interacted with Cu2+ and Zn2+ and the adsorption process was chemisorption. This study provides a new way for the recycling of solid waste red mud from aluminum industry.
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Key words:
- red mud /
- adsorbent /
- wastewater /
- heavy metal ions /
- adsorption kinetics /
- adsorption mechanism
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表 1 赤泥及赤泥基吸附剂化学成分分析
Table 1. The chemical composition of Red mud and red mud based magnetic adsorbent
/% 试样 TFe Al2O3 SiO2 TiO2 Na CaO MgO 赤泥 38.33 16.62 7.23 6.03 2.73 1.28 0.24 赤泥基吸附剂 45.53 16.22 6.03 5.68 2.18 1.33 0.24 
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表 2 赤泥基吸附剂的动力学模型拟合参数
Table 2. Kinetic model fitting parameters of red mud-based magnetic adsorbents
重金属离子 准一级动力学 准二级动力学 Qe k1 R2 Qe k2 R2 Cu2+ 19.66 0.09 0.977 30.28 0.03 0.980 Zn2+ 17.21 0.09 0.978 26.50 0.03 0.981
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表 3 赤泥基吸附剂的等温模型拟合参数
Table 3. Isothermal model fitting parameters of red mud-based adsorbents
重金属离子 Freundlich参数 Langmuir参数 KF n R2 Qm/(mg·g−1) KL R2 Cu2+ 4.55±0.86 0.36±0.04 0.949 33.12±0.75 0.027±0.00 0.993 Zn2+ 1.12±0.30 0.81±0.07 0.982 129.88±34.59 0.01±0.00 0.987
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