New easily recycled carrier based polyurethane foam by loading Al-MOF and biochar for selective removal of fluoride ion from aqueous solutions

Zhe Wang; Xinyue Gu; Xinbo Zhang; Xiao Wang; Jianqing Zhang; Ying Liu; Xinai Tan; Ying Zhao; Dejun Kang; Wenshan Guo; Huu Hao Ngo

doi:10.1016/j.scitotenv.2023.166312

New easily recycled carrier based polyurethane foam by loading Al-MOF and biochar for selective removal of fluoride ion from aqueous solutions

Sci Total Environ. 2023 Nov 25:901:166312. doi: 10.1016/j.scitotenv.2023.166312. Epub 2023 Aug 15.

Authors

Zhe Wang¹, Xinyue Gu¹, Xinbo Zhang², Xiao Wang³, Jianqing Zhang³, Ying Liu¹, Xinai Tan⁴, Ying Zhao⁵, Dejun Kang⁶, Wenshan Guo⁷, Huu Hao Ngo⁸

Affiliations

¹ Joint Research Center for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China.
² Joint Research Center for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China. Electronic address: zxbcj2006@126.com.
³ TG Hilyte Environment Technology (Beijing) Co., LTD., Beijing 100000, China.
⁴ Dayu Environmental Protection Co., Ltd, Tianjin 301739, China.
⁵ State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
⁶ College of Civil Engineering of Fuzhou University, Fuzhou University, Fuzhou 350108, China.
⁷ Joint Research Center for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia.
⁸ Joint Research Center for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia. Electronic address: ngohuuhao121@gmail.com.

PMID: 37586503
DOI: 10.1016/j.scitotenv.2023.166312

Abstract

The production of Integrated circuits (ICs) generates wastewater with a high concentration of residual fluoride ions, necessitating highly efficient fluorine removal methods. In this study, a novel composite carrier was developed using a hydrothermal synthesis method to load Al-MOF and biochar (BC) onto polyurethane foam (PUF), resulting in the composite foam of Al-MOF-PUF@BC. The results showed that the composite carrier exhibited a stable fluoride removal effect, with a maximum adsorption capacity of 16.52 mg/g at room temperature. The adsorption isotherm curves were consistent with the Langmuir isotherm model, and the adsorption kinetics were well-described by the pseudo-first-order model. The mechanism of fluorine adsorption on Al-MOF-PUF@BC was ligand exchange with hydroxyl groups and the formation of FAl bonds. Density functional theory (DFT) calculations revealed that the adsorption energy reached -246.7 eV, indicating stable adsorption for fluoride ions. The composite foam demonstrated excellent regenerative properties and was effective for fluoride removal in actual IC wastewater.

Keywords: Adsorption; Al-MOF; Bone carbon; Density functional theory; Fluorine removal; Polyurethane foam.