In Situ Synthesis of MnMgFe-LDH on Biochar for Electrochemical Detection and Removal of Cd<sup>2+</sup> in Aqueous Solution

oleh: Yongfang Yu, Wenting Yang, Haocheng Wang, Guoqin Huang

Format: Article
Diterbitkan: MDPI AG 2022-11-01

Deskripsi

Herein, MnMgFe-layered double hydroxides/biochar (MnMgFe-LDHs/BC) composite was fabricated by immobilizing MnMgFe-LDHs on BC via the coprecipitation method, which was employed as an effective material for the detection and removal of Cd<sup>2+</sup> from aqueous media. A lamellar structure of MnMgFe-LDHs with abundant surface-hydroxyl groups and various interlayer anions inside present a greater chance of trapping Cd<sup>2+</sup>. Meanwhile, the conductive BC with a porous structure provides numerous channels for the adsorption of Cd<sup>2+</sup>. Using the MnMgFe-LDHs/BC-based sensor, Cd<sup>2+</sup> can be detected with a low limit of detection down to 0.03 ng/L. The feasibility of detecting Cd<sup>2+</sup> in paddy water was also carried out, with satisfactory recoveries ranging from 97.3 to 102.3%. In addition, the MnMgFe-LDHs/BC material as an adsorbent was applied to remove Cd<sup>2+</sup> from water with adsorption capacity of 118 mg/g, and the removal efficiency can reach 91%. These results suggest that the as-prepared MnMgFe-LDHs/BC can serve as a favorable platform for efficient determination and removal of Cd<sup>2+</sup> in water.