In this study, an electrokinetic technique for remediation of Pb²⁺, Zn²⁺ and Cu²⁺ contaminated soil was explored using sodium alginate (SA) and chitosan (CTS) as promising biodegradable complexing agents. The highest Cu²⁺ (95.69%) and Zn²⁺ (95.05%) removal rates were obtained at a 2 wt% SA dosage, which demonstrated that SA significantly improved the Cu²⁺ and Zn²⁺ removal efficiency during electrokinetic process. The abundant functional groups of SA allowed metal ions desorption from soil via ion-exchange, complexation, and electrolysis. Pb²⁺ ions were difficult to remove from soil by SA due to the higher gelation affinity with Pb²⁺ than Cu²⁺ and Zn²⁺, despite the Pb²⁺ exchangeable fraction partially transforming to the reducible and oxidizable fractions. CTS could complex metal ions and migrate into the catholyte under the electric field to form crosslinked CTS gelations. Consequently, this study proved the suitability of biodegradable complexing agents for treating soil contaminated with heavy metals using electrokinetic remediation.

在这项研究中，使用藻酸钠（SA）和壳聚糖（CTS）作为有前途的可生物降解络合剂，探索了一种电动技术修复Pb 2 ⁺，Zn ²⁺和Cu ²⁺污染的土壤。在2 wt％的SA剂量下获得最高的Cu ²⁺（95.69％）和Zn ²⁺（95.05％）去除率，这表明SA显着提高了电动过程中Cu ²⁺和Zn ^2+的去除效率。SA丰富的官能团允许金属离子通过离子交换，络合和电解从土壤中解吸。由于与Pb的胶凝亲和力较高，因此难以通过SA从土壤中去除Pb ²⁺离子²⁺比的Cu ²⁺和Zn ²⁺，尽管铅²⁺可交换分数部分转换到可还原的和可氧化的级分。CTS可以使金属离子络合并在电场下迁移到阴极电解液中，形成交联的CTS凝胶。因此，这项研究证明了可生物降解的络合剂适用于通过电动修复处理重金属污染的土壤。