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Cation-π interaction in Mg(OH)2@GO-coated activated carbon fiber cloth for rapid removal and recovery of divalent metal cations by flow-through adsorption
Resources, Conservation and Recycling ( IF 11.2 ) Pub Date : 2022-09-21 , DOI: 10.1016/j.resconrec.2022.106648
Xiao Wang , Jingfeng Li , Qiang Guo , Menglan Xu , Xiaohan Zhang , Tong Li

Sorption is considered a promising approach for removing various divalent metal cations, yet the complicated recovery and regeneration strategy restricts the application of powder-like adsorbents. Herein, we report an innovative Mg(OH)2@GO adsorbents loaded on activated carbon fiber cloth (ACFC) using an electrophoretic deposition process (EDP) of Mg(OH)2 and graphene oxide (GO) suspensions to achieve rapid removal of Cd2+, Pb2+, Ni2+, and Cu2+ via flow-through adsorption over an ultra-short period time. FESEM and HRTEM results revealed a cross-linked structure on the ACFC surface derived from the cation-π interaction between Mg2+ and GO under EDP. Importantly, by virtue of oxygen-containing functional groups and π electron region, Mg(OH)2@GO exhibited high adsorption capacities for Pb2+, Cu2+, Cd2+, and Ni2+, which could reach 647.2, 439.5, 297.3, and 219.1 mg g−1 at 293 K, respectively. Furthermore, Mg(OH)2@GO-ACFC possessed a rapid regeneration capability with EDTA by a flow-through system for divalent metal cations desorption and exhibited excellent repeatability in 5-cycle tests. Overall, we propose the novel flow-through system that facilitates the rapid adsorption and recovery of divalent metal cations for wastewater treatment.



中文翻译:

Mg(OH)2@GO涂层活性炭纤维布中的阳离子-π相互作用通过流通吸附快速去除和回收二价金属阳离子

吸附被认为是一种有前途的去除各种二价金属阳离子的方法,但复杂的回收和再生策略限制了粉末状吸附剂的应用。在此,我们报告了一种创新的 Mg(OH) 2 @GO 吸附剂,该吸附剂使用 Mg(OH) 2和氧化石墨烯 (GO) 悬浮液的电泳沉积工艺 (EDP) 负载在活性炭纤维布 (ACFC) 上,以实现对 Cd 的快速去除。2+、Pb 2+、Ni 2+和Cu 2+通过流通吸附在超短的时间内。FESEM 和 HRTEM 结果显示 ACFC 表面上的交联结构源自 Mg 2+和 GO之间的阳离子-π 相互作用在 EDP 下。重要的是,凭借含氧官能团和π电子区,Mg(OH) 2 @GO对Pb 2+、Cu 2+、Cd 2+和Ni 2+表现出较高的吸附容量,可达647.2、439.5 、297.3 和 219.1 mg g -1在 293 K 时,分别。此外,Mg(OH) 2 @GO-ACFC 通过用于二价金属阳离子解吸的流通系统与 EDTA 具有快速再生能力,并在 5 次循环测试中表现出优异的重复性。总体而言,我们提出了一种新型流通系统,该系统有助于快速吸附和回收用于废水处理的二价金属阳离子。

更新日期:2022-09-22
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