Preparation of Novel La-MOF/GO Composite Materials and Their Adsorption Performance for Fluoride Ions in Water

Abstract

Aiming at the problem that fluorine chemical industry has caused different degrees of harm to the environment and human health, we prepared a graphene oxide-supported lanthanum foundation organic framework to treat fluorine-containing wastewater. In this study, La-MOF/GO is prepared using the solvothermal method. The results show that when the La-MOF:GO quality ratio is 7:1, the organic framework prepared shows the best fluorine removal effect. Under the optimal adsorption reaction conditions of 25 °C, pH of 4 and contact time 4 h, La-MOF/GO was used to treat 30 mg/L fluorine-containing wastewater. The removal rate of fluoride was 94.9%, and the adsorption capacity was 94.89 mg/g. The presence of four anions, Cl^ˉ, SO_₄^2ˉ, CO_₃^2ˉ, and PO_₄^3ˉ had little effect on the defluorination performance of La-MOF/GO. La-MOF/GO adsorbed fluorine through endothermic reaction and single molecular layer chemisorption process, and its reusability was good. La-MOF/GO adsorbent improves the problem of easy agglomeration of metal-organic skeleton materials. It has great advantages in treating fluorine-containing wastewater.