Zeolitic imidazolate framework-8 nanoparticle: a promising adsorbent for effective fluoride removal from aqueous solution

Parwathi Pillai,Swapnil Dharaskar,Mohammad Khalid,Surendra Sasikumar

doi:10.1007/s13201-019-1030-9

Parwathi Pillai, Swapnil Dharaskar + Show 2 more

Open Access

https://doi.org/10.1007/s13201-019-1030-9

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Abstract

Fluoride removal from living entities is the foremost task as it is a non-biodegradable and harmful pollutant mostly found in groundwater. Nowadays, the application of nanoparticles as an adsorbent of fluoride is becoming an intense research due to its high surface area. In the present study, zeolitic imidazolate framework-8 (ZIF-8) nanoparticles adsorption behavior and its efficiency in fluoride removal from an aqueous phase were studied. Various structures, sizes and morphologies of nanoparticles were investigated by Fourier-transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscope, transmission electron microscopy, Raman spectroscopy and zeta seizer. By varying process parameters such as contact time, adsorbent dosage, stirring rate, temperature, and pH, batch adsorption was carried out. The optimum conditions for fluoride removal by ZIF-8 nanoparticles were found as contact time 15 min, adsorbent dosage 0.06 g/L, agitation rate 400 rpm, temperature 20 °C, pH 8. Pseudo-second order in kinetic study showcases that the regression coefficient was found to be 0.99. The experimental data of Langmuir isotherm model of adsorption system reveal the adsorption capacity of 90 mg/g which has better adsorption capacity than other adsorbents. The isothermal multistage adsorption was also studied to understand the mechanism of adsorption of ZIF-8 nanoparticles for fluoride removal. The result in the present work gives a promising adsorbent for the fluoride removal.

Highlights

Fluoride ions are found in animals, plants, food, soil and air
The zeta seizer shows particle size range of zeolitic imidazolate framework-8 (ZIF-8) nanoparticles from 200–300 nm as same as that shown by transmission electron microscopy (TEM) in Fig. 6 (Kaur et al 2017)
ZIF-8 NPs were synthesized at room temperature in a single pot

Summary

Introduction

Fluoride ions are found in animals, plants, food, soil and air. In more than 35 nations around the globe, people have found fluoride in excess in drinking water. The harmful cause due to fluoride is in dental and skeletal fluorosis. Dental fluorosis mainly affects the teeth, where it causes enamel and cavities problem. It decreases the mineral content of teeth. Fluoride affects the human beings and the plant species. India is not the only nation which has been affected by fluorosis; the problem has spread worldwide in developing countries such as Argentina, Australia, Algeria, USA, Libya, Turkey, Iran, China, Iraq, Sri Lanka, Canada, Thailand, Japan, South Africa, Kenya and New Zealand. The health problems in the human body, plants and cattle occur due to the fluoride present in water as the fluoride contamination is more extensive in India (Kusrini et al 2015)

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