The porous metal-organic frameworks, MIL-101, MIL-101-SOH and MIL-101-NH 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-NH fits well with Langmuir model and the maximum adsorption capacities are calculated to 204.08 mg g and 277.78 mg g, respectively; while the adsorption onto MIL-101-SOH cannot fit well with both Langmuir and Freundlich models and the maximum adsorption capacity in the experiment is 25 mg g. 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-NH with abundant amino groups can exhibit better adsorption capacity and removal percentage towards rocephin than MIL-101, MIL-101-SOH, and some other common adsorbents. In addition, co-existed Zn(NO) can induce a large improvement of rocephin adsorption performance of MIL-101-NH. At last, MIL-101-NH demonstrates to be a renewable adsorbent. In conclusion, we suggest MIL-101-NH is a promising adsorbent for effective removal of rocephin in water.
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| http://dx.doi.org/10.1016/j.jcis.2017.12.041 | DOI Listing |
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