A silsesquioxane-porphyrin-based porous organic polymer as a highly efficient and recyclable absorbent for wastewater treatment

Yanli Chen; Yishan Fang; Jingkun Yu; Wenqiang Gao; Huijuan Zhao; Xiaomei Zhang

doi:10.1016/j.jhazmat.2020.124769

A silsesquioxane-porphyrin-based porous organic polymer as a highly efficient and recyclable absorbent for wastewater treatment

J Hazard Mater. 2021 Mar 15:406:124769. doi: 10.1016/j.jhazmat.2020.124769. Epub 2020 Dec 5.

Authors

Yanli Chen¹, Yishan Fang², Jingkun Yu³, Wenqiang Gao¹, Huijuan Zhao¹, Xiaomei Zhang⁴

Affiliations

¹ School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China.
² School of Food Science and Engineering, Qilu University of Technology, Jinan, Shandong 250353, China.
³ Jinan Shanda Experimental High School, Jinan, Shandong 250353, China.
⁴ School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China. Electronic address: zhangxiaomei@sdu.edu.cn.

PMID: 33316666
DOI: 10.1016/j.jhazmat.2020.124769

Abstract

Effective capture of pollutants from wastewater is crucial for protecting the environment and human health. An azo-based porous organic polymer (AzoPPOP) containing porphyrin and inorganics cage polyhedral oligomeric silsesquioxane units was synthesized via a catalyst-free coupling reaction. Results showed that AzoPPOP possess a high surface area, a hierarchically porous structure, good thermal stability, abundant adsorption sites, and an electronegative nature. Based on these properties, AzoPPOP had an extremely high adsorption capacity (1357.58 mg g^-1) for RhB, a fast adsorption rate, and good selectivity. Study of the mechanism revealed that in addition to electrostatic interactions, the high specific surface area, existence of -NH₂, and the strong π-π interaction between AzoPPOP and RhB also play important roles for the adsorption of RhB. AzoPPOP also displayed excellent adsorption properties for heavy metal ions (230.45, 192.24 and 162.11 mg g^-1 for Ag⁺, Hg²⁺, and Pb²⁺, respectively). More importantly, simulation of the purification experiment of waste water and the recycling regeneration experiment revealed that AzoPPOP has good high-level recyclability and could remove multi-pollutants in one pass through a simple adsorption column.

Keywords: Adsorption; Polyhedral oligomeric silsesquioxane; Porous organic polymers; Porphyrin; Rhodamine B.

Publication types

Research Support, Non-U.S. Gov't