Removal of multiple metal ions from wastewater by a multifunctional metal-organic-framework based trap

• Published in: Water science and technology Vol. 84; no. 7; pp. 1594 - 1607
• Main Authors: Nie, Rong, Yang, Cailing, Zhang, Jing, Dong, Kun, Zhao, Guohu
• Format: Journal Article
• Language: English
• Published: IWA Publishing 01-10-2021
• Subjects: common contaminant metal ions; ethylenediaminetetraacetic acid (edta); metal ions trap; metal-organic-framework (mof); sewage treatment
• ISSN: 0273-1223; 1996-9732
• DOI: 10.2166/wst.2021.340

Abstract
The design and preparation of multifunctional adsorbent for practical wastewater treatment is still an enormous challenge. To remove multiple metal ions from wastewater, we developed a broad-spectrum metal ions trap named UIO-67-EDTA by incorporation of ethylenediaminetetraacetic acid into robust UIO-67. The adsorption experiments for 15 kinds of heavy metal ions including hard acid (Mn2+, Ba2+, Al3+, Cr3+, Fe3+), borderline acid (Co2+, Ni2+, Cu2+, Zn2+, Pb2+, Sn2+, Bi2+), soft acid (Ag+, Cd2+, Hg2+), and two kinds of dissolved minerals (Mg2+, Ca2+) show that the trap is very effective both in batch adsorption processes and breakthrough processes. At a pH value of 4.0, the removal efficiency for all metal ions was over 98% within 10 min, and the maximum static adsorption capacity for the representative metal ions Cr3+, Hg2+and Pb2+ was up to 416.67, 256.41, and 312.15 mg g−1, respectively. The adsorption kinetics fitted well with the pseudo-second-order model, indicating that the chemical adsorption was the rate-determining step in the adsorption process. Meanwhile, the material showed high stability and recyclability, the removal efficiency for the three representative metals was still maintained over 93% after five consecutive adsorption cycles.