文献类型：期刊文献

英文题名：Preparation of Micro-Nano Material Composed of Oyster Shell/Fe₃O₄ Nanoparticles/Humic Acid and Its Application in Selective Removal of Hg(II)

作者：He, Chuxian[1,2];Qu, Junhao[3];Yu, Zihua[3];Chen, Daihuan[3];Su, Tiantian[3];He, Lei[1];Zhao, Zike[1];Zhou, Chunxia[2,3,4];Hong, Pengzhi[2,3,4];Li, Yong[1];Sun, Shengli[1];Li, Chengyong[1,2,4]

机构：[1]Guangdong Ocean Univ, Sch Chem & Environm, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Shenzhen Inst, Shenzhen 518108, Peoples R China;[3]Guangdong Ocean Univ, Coll Food Sci & Technol, Zhanjiang 524088, Peoples R China;[4]Guangdong Modern Agr Sci & Technol Innovat Ctr, Zhanjiang 524088, Peoples R China

年份：2019

卷号：9

期号：7

外文期刊名：NANOMATERIALS

收录：SCI-EXPANDED(收录号：WOS:000478992600041)、、WOS

基金：This research was funded by the National Natural Science Foundation of China (21874029), Guangdong Yangfan Program (201635018), Guangdong Special Support Program (2017TQ04N706), Science and Technology Planning Project of Guangdong Province (2016A020210114), Technology Planning Project of Zhanjiang City (2018A02014, 2016C01002, A18013), Science and Technology Planning Project of Shenzhen City (JCYJ20170818111719650), Industrial Development Special Funds of Dapeng New Area (KY20170209, KY20180202), Innovation and Development Project about Marine Economy Demonstration of Zhanjiang City (2017C8B1), Project of Enhancing School with Innovation of Guangdong Ocean University (Q18304), and Training Programs of Innovation and Entrepreneurship for Undergraduates (CXXL2018008).

语种：英文

外文关键词：mercury adsorption; humic acid; Fe3O4 nanoparticles; oyster shell

外文摘要：Micro-nano composite material was prepared to adsorb Hg(II) ions via the co-precipitation method. Oyster shell (OS), Fe3O4 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 Fe3O4 derived from X-ray diffraction (XRD), and the transformation of pore sizes to 50 nm and 20 mu m by mercury intrusion porosimetry (MIP) jointly revealed the successful grafting of HA-functionalized Fe3O4 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 mgL(-1)), 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-2 = 0.991) and were shown to follow a pseudo-second-order reaction model (R-2 = 0.998). The maximum adsorption capacity of Hg(II) was shown to be 141.57 mgg(-1). In addition, this new adsorbent exhibited excellent selectivity.