Herein, we investigated a new strategy to modify the graphene oxide (GO) with sodium alginate (SA) using tetraethylorthosilicate (TEOS) as a binding agent. The graphene oxide-sodium alginate composite was highly loaded with carboxylate (–COO⁻Na⁺) groups, which permitted fast and efficient interaction with the metal ions. Therefore, the prepared composite was employed as an efficient adsorbent to uptake some heavy metals from an aqueous solution. The as-synthesized GO-SA was characterized by various advanced techniques before and after the removal process. The analysis of the experimental data showed that the Langmuir model fits well the adsorption data with maximum adsorption capacities of 887.21, 161.25, and 139.62 mg g⁻¹ for Pb²⁺, Zn²⁺, and Cd²⁺, respectively. Moreover, the GO-SA presented a good regeneration and reuse ability, enhancing the removal rate for all the studied metal ions. In addition, the prepared composite showed a suitable selectivity for Pb²⁺ from Zn²⁺, and Cd²⁺ co-existed solution.

在此，我们研究了一种使用原硅酸四乙酯 (TEOS) 作为粘合剂，用海藻酸钠 (SA) 修饰氧化石墨烯 (GO) 的新策略。氧化石墨烯-海藻酸钠复合材料富含羧酸根（-COO ^- Na ⁺）基团，可与金属离子快速有效地相互作用。因此，制备的复合材料被用作从水溶液中吸收一些重金属的有效吸附剂。合成后的 GO-SA 在去除过程前后具有各种先进技术的特点。实验数据分析表明，Langmuir模型与吸附数据拟合良好，对Pb ²⁺的最大吸附容量分别为887.21、161.25和139.62 mg g ^-1、Zn ²⁺和Cd ²⁺。此外，GO-SA 具有良好的再生和再利用能力，提高了所有研究金属离子的去除率。此外，所制备的复合材料对Zn ²⁺和Cd ²⁺共存溶液中的Pb ^{2+表现出合适的选择性。}