Adsorption of 2,4-dichlorophenoxyacetic acid and glyphosate from water by FeO-UiO-66-NH obtained in a simple green way.

In this study, a green adsorbent (FeO-UiO-66-NH) with the ability of addressing the issues of separation and recovery of UiO-66-NH is obtained using a simple co-precipitation method under environmentally benign conditions. Various characterization techniques are utilized for evaluating the properties of the developed adsorbent. The capability of FeO-UiO-66-NH towards 2,4-dichlorophenoxyacetic acid (2,4-D) and glyphosate (GP) from solution is explored. The results revealed that the magnetization process did not destroy the crystal structure of UiO-66-NH, which ensured that FeO-UiO-66-NH had good adsorption performance for 2,4-D and GP. The adsorption processes showed a wide pH application range, high salt tolerance, and regeneration performance as well as an excellent adsorption rate. Results from thermodynamic study showed that both processes were spontaneous and endothermic. The unit uptake ability of FeO-UiO-66-NH for 2,4-D and GP reached up to 249 mg·g and 183 mg·g from Langmuir model at 303 K, respectively. When solid-liquid ratio was 2 g·L, FeO-UiO-66-NH can reduce the content of 2,4-D or GP with the initial density of 100 mg·L below the drinking water requirement limit. In addition, the reusability efficiency of FeO-UiO-66-NH towards 2,4-D and GP was found to be 86% and 80% using 5 mmol·L NaOH as eluent. Analysis of simulated water samples indicated that FeO-UiO-66-NH could achieve the single or simultaneous removal of 2,4-D and GP from wastewater. Summarily, FeO-UiO-66-NH as a green adsorbent can serve as an alternative for removing 2,4-D and GP from water body.