Synthesis and application of novel modified nanocomposite for solid phase extraction of lead(II)
کد مقاله : 1032-INZC6
نویسندگان:
اسما اسماعیل زاده *1، داریوش افضلی2، مریم فیاضی3
1گروه شیمی- دانشکده شیمی و مهندسی شیمی- داشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته- کرمان- ایران
2گروه شیمی، دانشکده شیمی و مهندسی شیمی، دانشگاه تحصیلا تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران
3گروه محیط زیست، پژوهشکده علوم محیطی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران
چکیده مقاله:
Lead is one of the most significant trace elements due to high toxicity even at very low concentrations [1]. The World Health Organization (WHO) has set the action level for lead in drinking water at 10 μg L−1 [2]. Therefore, the development of sensitive and reliable methods for the determination of lead(II) ions in food, biological and water samples is very important. In this work, a carbon-coated sepiolite nanocomposite modified by 2-(5-bromo-2-pyridylazo)-5-(diethyl amino) phenol (Sep@C@5-BrPADAP) was applied for solid-phase extraction (SPE) of lead(II). Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy with energy dispersive X-ray spectroscopy (FESEM-EDX) and X-ray diffraction (XRD) spectrometry were used to characterize the sorbent. The effects of pH (1.0-9.0), sample volume (10.0-500.0 mL), eluent concentration (0.5-4.0 M), volume of eluent (0.5-5.0 mL), extraction and desorption time (10-300 min), amount of sorbent (0.01-1.0 mg) and interfering ions (Na(I), K(I), Cs(I), Mg(II), Ca(II), Mn(II), Fe(III), Al(III), Co(II), Ni(II), Cd(II), Zn(II), Cu(II), Hg(II), Bi(III)) were investigated. The maximum adsorption capacity of the novel adsorbent for lead(II) was found to be 51.6 mg g-1. The proposed method exhibited some advantages, such as simplicity, rapidity, high sensitivity and acceptable precision.
کلیدواژه ها:
Nanocomposite; Lead; Sepiolite; Preconcentration
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