Removal of Lindane from Aqueous Solution Using Aluminum Hydroxide Nanoparticles with Surface Modification by Anionic Surfactant.

Thi Thuy Linh Nguyen,Thi Hang Nguyen,Thanh Son Le,Tien Duc Pham

doi:10.3390/polym12040960

Thi Thuy Linh Nguyen, Thi Hang Nguyen + Show 2 more

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https://doi.org/10.3390/polym12040960

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Abstract

In the present study, we investigated the removal of an emerging pesticide lindane from aqueous solution using synthesized aluminum hydroxide Al(OH)3 (bayerite) nanomaterials with surface modification by an anionic surfactant sodium dodecyl sulfate (SDS). The Al(OH)3 nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) and zeta potential. The lindane removal using SDS-modified nano-aluminum hydroxide nanoparticles (SMNAH) achieved removal of up to 93.68%, which was 3.3 times higher than that of nano-aluminum hydroxide nanoparticles. The adsorptive removal conditions were studied and found to have an adsorption time of 60 min, a pH of 6, an adsorbent dosage of 25 mg/mL and an ionic strength of 10 mM NaCl. After reusing four times, the removal efficiency of lindane using SMNAH still reached 75%. Two-step adsorption can fit adsorption isotherms of lindane onto SMNAH at two salt concentrations. On the basis of the change in zeta potential, surface functional groups and adsorption isotherms, we suggest that the formation of a bilayer micelle induced the removal of lindane.

Highlights

Pesticides are important chemicals that are often used in agricultural activities.most pesticides are harmful and dangerous due to their toxicity and very low self-degradation in nature [1]
The synthesized aluminum hydroxide was evaluated by different physiochemical techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and ζ potential
We found that the SDS-Modified Nano-Aluminum Hydroxide (SMNAH) investigated in this work achieved the highest removal efficiency and the biggest adsorption capacity compared to many kinds of adsorbents for lindane removal (Table 3)

Summary

Introduction

Pesticides are important chemicals that are often used in agricultural activities.most pesticides are harmful and dangerous due to their toxicity and very low self-degradation in nature [1]. Some pesticides belong to the persistent organic pollutants (POPs) group that are synthetic organic substances with some intrinsic chemical–physical characteristics such as persistency, toxicity, bio-accumulation and long transportable nature [2]. There are different kinds of POPs, in which organochloride pesticides (OCPs) have been one of the most important with regard to environmental concerns. Among the OCPs, lindane is known to be very persistent, toxic and bio-accumulative in humans and animals [4]. The mitigation of different environmental pollutants has been increasingly important in fields such as pharmaceuticals [5], heavy metals [6,7] and dyes [8,9]. Many pollutants have been studied with regard to their removal from aqueous solutions by different techniques

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