Removal of low Sb(V) concentrations from mining wastewater using zeolitic imidazolate framework-8

Wenpeng Li; Qingping Wang; Xiaoying Jin; Nasreen Islam Khan; Gary Owens; Zuliang Chen

doi:10.1016/j.jenvman.2021.112280

Removal of low Sb(V) concentrations from mining wastewater using zeolitic imidazolate framework-8

J Environ Manage. 2021 Jun 1:287:112280. doi: 10.1016/j.jenvman.2021.112280. Epub 2021 Mar 8.

Authors

Wenpeng Li¹, Qingping Wang¹, Xiaoying Jin², Nasreen Islam Khan³, Gary Owens³, Zuliang Chen⁴

Affiliations

¹ Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, Fujian Province, China.
² Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, Fujian Province, China. Electronic address: xyjin@fjnu.edu.cn.
³ Environmental Contaminants Group, Future Industries Institute, University of South Australia, Mawson Lakes, SA, 5095, Australia.
⁴ Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, Fujian Province, China. Electronic address: zlchen@fjnu.edu.cn.

PMID: 33706094
DOI: 10.1016/j.jenvman.2021.112280

Abstract

Wastewater generated during mining remains a significant source of antimony pollution, because techniques to quickly and efficiently remove antimony from wastewater do not exist. In this study, zeolitic imidazolate framework-8 (ZIF-8), a specific type of Metal Organic Frameworks (MOFs), was successfully used to remove trace levels (1 mg L^-1) of Sb(V) with a high removal efficiency when the ZIF-8 dose was 0.5 g L^-1. Scanning electron microscopy-X-ray energy dispersive spectrometry (SEM-EDS) indicated that Sb(V) was adsorbed onto the ZIF-8surface. The powder X-ray diffraction (XRD) pattern of ZIF-8 before and after adsorption of Sb(V) indicated that ZIF-8 was successfully synthesized, and remained structurally stable after Sb(V) was adsorbed. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) both suggested complexation of zinc on ZIF-8 with Sb(V), where removal of Sb(V) by ZIF-8 followed the Langmuir adsorption isotherm with pseudo second-order kinetics. Thus, a possible removal mechanism was proposed which involved Sb(V) complexing with the zinc hydroxyl groups on ZIF-8 (Zn-OH-Sb). Practically, ZIF-8, could remove 78.6% of Sb(V) from a mining wastewater containing 20 μg L^-1 Sb(V). Furthermore, ZIF-8 could be remain active after repeated uses and could still remove and 42.3% of Sb(V) from wastewater containing 1 mg L^-1) Sb(V) even when the ZIF-8 was reused five time. This indicated that ZIF-8 had potential for practical removal of Sb(V) from mining wastewaters.

Keywords: Mechanism; Mining wastewaters; Removal; Sb(V); ZIF-8.

MeSH terms

Adsorption
Mining
Wastewater
Water Pollutants, Chemical* / analysis
Zeolites*

Substances

Waste Water
Water Pollutants, Chemical
Zeolites