Preparation of Micro-Nano Material Composed of Oyster Shell/FeO Nanoparticles/Humic Acid and Its Application in Selective Removal of Hg(II)

Overview

Journal Nanomaterials (Basel)

Date 2019 Jul 3

PMID 31262004

Citations 4

Authors

Chuxian He

Junhao Qu

Zihua Yu

Daihuan Chen

Tiantian Su

Lei He

Zike Zhao

Chunxia Zhou

Pengzhi Hong

Yong Li

Shengli Sun

Chengyong Li

Affiliations

Soon will be listed here.

Abstract

Micro-nano composite material was prepared to adsorb Hg(II) ions via the co-precipitation method. Oyster shell (OS), FeO nanoparticles, and humic acid (HA) were used as the raw materials. The adhesion of nanoparticles to OS displayed by scanning electron microscopy (SEM), the appearance of the (311) plane of standard FeO derived from X-ray diffraction (XRD), and the transformation of pore sizes to 50 nm and 20 μm by mercury intrusion porosimetry (MIP) jointly revealed the successful grafting of HA-functionalized FeO onto the oyster shell surface. The vibrating sample magnetometer (VSM) results showed superparamagnetic properties of the novel adsorbent. The adsorption mechanism was investigated based on X-ray photoelectron spectroscopy (XPS) techniques, which showed the process of physicochemical adsorption while mercury was adsorbed as Hg(II). The effects of pH (3-7), initial solution concentration (2.5-30 mg·L), and contact time (0-5 h) on the adsorption of Hg(II) ions were studied in detail. The experimental data were well fitted to the Langmuir isotherm equation (R = 0.991) and were shown to follow a pseudo-second-order reaction model (R = 0.998). The maximum adsorption capacity of Hg(II) was shown to be 141.57 mg·g. In addition, this new adsorbent exhibited excellent selectivity.

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