Functionalized metal-organic frameworks for effective removal of rocephin in aqueous solutions

Xudong Zhao; Yanan Wei; Huifang Zhao; Zhuqing Gao; Yuezhong Zhang; Lifei Zhi; Yuanyang Wang; Hongliang Huang

doi:10.1016/j.jcis.2017.12.041

Functionalized metal-organic frameworks for effective removal of rocephin in aqueous solutions

J Colloid Interface Sci. 2018 Mar 15:514:234-239. doi: 10.1016/j.jcis.2017.12.041. Epub 2017 Dec 16.

Authors

Xudong Zhao¹, Yanan Wei¹, Huifang Zhao¹, Zhuqing Gao², Yuezhong Zhang¹, Lifei Zhi¹, Yuanyang Wang¹, Hongliang Huang³

Affiliations

¹ College of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030012, China.
² College of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030012, China. Electronic address: zqgao2008@163.com.
³ State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China. Electronic address: huanghl@mail.buct.edu.cn.

PMID: 29274554
DOI: 10.1016/j.jcis.2017.12.041

Abstract

The porous metal-organic frameworks, MIL-101, MIL-101-SO₃H and MIL-101-NH₂ were used for the removal of harmful drug (rocephin) from water via adsorption. The kinetics study suggests that the adsorption onto all the MOFs follows the pseudo-second-order model. The adsorption isotherms results suggest that the adsorption onto MIL-101 and MIL-101-NH₂ fits well with Langmuir model and the maximum adsorption capacities are calculated to 204.08 mg g^-1 and 277.78 mg g^-1, respectively; while the adsorption onto MIL-101-SO₃H cannot fit well with both Langmuir and Freundlich models and the maximum adsorption capacity in the experiment is 25 mg g^-1. Furthermore, the effect of pH as well as the adsorption mechanism was analysed systematically. It was found that electrostatic interaction as well as hydrogen-bond interaction plays dominant roles in adsorption of rocephin, and MIL-101-NH₂ with abundant amino groups can exhibit better adsorption capacity and removal percentage towards rocephin than MIL-101, MIL-101-SO₃H, and some other common adsorbents. In addition, co-existed Zn(NO₃)₂ can induce a large improvement of rocephin adsorption performance of MIL-101-NH₂. At last, MIL-101-NH₂ demonstrates to be a renewable adsorbent. In conclusion, we suggest MIL-101-NH₂ is a promising adsorbent for effective removal of rocephin in water.

Keywords: Adsorption; Electrostatic interaction; Metal-organic frameworks; Rocephin.