Preparation of Porous Hydroxyapatite Using Cetyl Trimethyl Ammonium Bromide as Surfactant for the Removal of Lead Ions from Aquatic Solutions.

Silviu-Adrian Predoi,Mikael Motelica-Heino,Monica Luminita Badea,Mariana Carmen Chifiriuc,Carmen Steluta Ciobanu,Simona Liliana Iconaru

doi:10.3390/polym13101617

Abstract

In the present study, a new low-cost bioceramic nanocomposite based on porous hydroxyapatite (HAp) and cetyl trimethyl ammonium bromide (CTAB) as surfactant was successfully obtained by a simple chemical co-precipitation. The composition and structure of the HAp-CTAB were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), scanning electron microscope (SEM) equipped with an energy dispersive X-ray (EDX) spectrometer, and N2 adsorption/desorption analysis. The capacity of HAp-CTAB nanocomposites to remove the lead ions from aqueous solutions was studied by adsorption batch experiments and proved by Langmuir and Freundlich models. The Pb2+ removal efficiency of HAp-CTAB biocomposite was also confirmed by non-destructive ultrasound studies. The cytotoxicity assays showed that the HAp-CTAB nanocomposites did not induce any significant morphological changes of HeLa cells after 24 h of incubation or other toxic effects. Taken together, our results suggests that the obtained porous HAp-CTAB powder could be used for the decontamination of water polluted with heavy metals, such as Pb2+.

Highlights

In the recent years, one of the major issues affecting the public health area worldwide is the heavy metals contamination of waters
The present study was aimed to obtain, for the first time, a porous bioceramic composite based on hydroxyapatite (HAp) with cetyl trimethyl ammonium bromide (CTAB) as a surfactant, using the co-precipitation method
The HAp-CTAB biocomposite was used as an effective adsorbent in order to remove the lead ions from contaminated aqueous solution

Summary

Introduction

One of the major issues affecting the public health area worldwide is the heavy metals contamination of waters. The excess of metals in the water stream could inflict severe diseases in people and have a negative impact on the environmental ecosystems [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. One of the most current interests in science and public health policy worldwide is the lead carcinogenicity, which is significant for many populations around the globe. The lead effects on the hematological system (e.g., inhibition of hemoglobin synthesis and altering of the red blood cells morphology and survival rate, with the occurrence of anemia) have been known and studied for years. Studies regarding the toxic effects of lead against cell membrane components concluded that there is a direct correlation between the toxic effects and lead-induced oxidative damage [19,20,21]

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Conclusion