The Magnetic Hybrid Cu(I)-MOF@Fe₃O₄ with Hierarchically Engineered Micropores for Highly Efficient Removal of Cr(VI) from Aqueous Solution

It is an urgent topic for public health and environmental protection to remove Cr­(VI) from wastewater effectively and conveniently. Herein, we fabricate the novel hybrid magnetic material HPU-13@Fe₃O₄ (HPU-13 = {[Cu₃(L)₂]·OH·2CH₃CH₂OH·10H₂O}_n; HL = 2-(5-pyridin-4-yl-2H-[1,2,4]­triazol-3-yl)­pyrimidine), which shows excellent Cr­(VI) removal efficiency and is easily employed as a reusable absorbent. The maximum capacities of Cr₂O₇^2– and CrO₄^2– adsorbed on HPU-13@Fe₃O₄ were 398.41 and 471.69 mg/g, respectively, larger than those of reported MOFs used in Cr₂O₇^2– and CrO₄^2– adsorption. Adsorption mechanism studies confirmed that the synergistic reaction of Cr­(VI) reduction and adsorption was responsible for the high removal efficiency. The above evidence proved that HPU-13@Fe₃O₄ has the potential functional ability to decontaminate Cr­(VI) polluted water systems.