摘要：

以二维层状阳离子插层电极Ti₃C₂为阴极，二维层状阴离子插层电极NiAl-LMO为阳极，进行了电吸附去除水中Pb²⁺的研究。结果表明，对初始质量浓度为200 mg/L的Pb（NO₃）₂溶液，在210 min后可达到吸附平衡，Pb²⁺去除率达98.48%，平衡吸附量为96.36 mg/g。Pb²⁺与Ca²⁺共存时，Ti₃C₂电极对Pb²⁺表现出较强选择性，Pb²⁺吸附量为Ca²⁺的近10倍。吸附过程符合准一级动力学模型，倾向于物理吸附。Ti₃C₂的层状结构具有较大的比表面积，表面所携带的羟基基团为Pb²⁺的去除提供了较多的结合位点。

关键词: Ti₃C₂, 电吸附, Pb²⁺

Abstract:

The two-dimensional layered cationic intercalation electrode Ti₃C₂ was used as the cathode and the twodimensional layered anion intercalation electrode NiAl-LMO was used as the anode to remove Pb²⁺ from water by electro-adsorption. The results showed that the adsorption equilibrium could be reached after 210 min for the Pb(NO₃)₂ solution with initial mass concentration of 200 mg/L. The removal rate of Pb²⁺ was 98.48% and the equilibrium adsorption capacity was 96.36 mg/g. When Pb²⁺ coexisted with Ca²⁺, Ti₃C₂ electrode showed strong selectivity to Pb²⁺, and the adsorption capacity of Pb²⁺ was nearly 10 times of that of Ca²⁺. The adsorption process conformed to the quasi-firstorder kinetic equation and was inclined to physical adsorption. The layered structure of Ti₃C₂ had a large specific surface area, and the hydroxyl groups on the surface provided more binding sites for Pb²⁺ removal.

Key words: Ti₃C₂, electro-adsorption, lead ion

中图分类号: 

• X703.1