海泡石改性制备磁性纳米复合材料对Pb(Ⅱ)去除的研究  

Study on removal ability to Pb(Ⅱ)of magnetic nanocomposite derived from sepiolite

作　　者：于生慧 王翼远 王艳 胡小敏 姜铭峰 YU Sheng-hui;WANG Yi-yuan;WANG Yan;HU Xiao-min;JIANG Ming-feng(School of Environmental Science and Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)

机构地区：[1]陕西科技大学环境科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报》2023年第3期20-28,36,共10页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(41702038);陕西省科技厅自然科学基金项目(2019JM-375);陕西省科技创新团队计划项目(2022TD-09);陕西省重点产业链计划项目(2022ZDLNY02-02)。

摘　　要：在天然粘土矿物中,海泡石具有独特的纳米棒状和层链状结构,从而具备较大的比表面积和孔体积,在环境污染修复领域逐渐受到关注.在本研究中,首先以海泡石为原材料通过酸碱化处理制备了SiO_(2)-Mg(OH)_(2)复合材料,再通过磁铁矿的负载,制备出一种新型的具有磁性的、高比表面积含镁纳米复合材料(SiO_(2)-Mg(OH)_(2)-Fe_(3)O_(4)),在此基础上,研究了新型复合材料对水体中Pb(Ⅱ)的去除效果.结果表明,与海泡石原样相比,所制备的含镁纳米复合材料(SiO_(2)-Mg(OH)_(2)-Fe_(3)O_(4))表现出较大的比表面积和良好的磁性,其对重金属Pb(Ⅱ)去除容量为257.6 mg/g.纳米磁性复合材料对Pb(Ⅱ)的吸附过程符合拟一级动力学模型;吸附热力学模拟显示,磁性复合材料对Pb(Ⅱ)的吸附符合Freundich模型.综合海泡石基磁性纳米复合材料制备过程简捷和良好的磁分离性,所制备的复合材料在环境领域具有良好的应用前景.Among the natural clay minerals,sepiolite has been widely used in environmental remediation fields due to its fibrous chain structure of interlayer between silicon oxygen tetrahedron and magnesium oxygen octahedron,which has large specific surface area and pore volume.In this study,SiO 2-Mg(OH)_(2) composite material was first prepared derived from sepiolite via acid-alkaline treatment,and magnetite was then loaded on the composite,forming magnetic nanocomposite(SiO 2-Mg(OH)_(2)-Fe 3O 4)with high specific surface area.Meanwhile,the removal performance of this new nanocomposite material to Pb(II)was studied,systematically.The results demonstrate that the removal capacity of the magnesia-containing nanocomposite(SiO 2-Mg(OH)_(2)-Fe 3O 4)for Pb(Ⅱ)is 257.6 mg/g,which has higher specific surface area and good magnetism compared with raw sepiolite.The adsorption data fit well with the pseudo-first-order adsorption kinetic model and Freundich isotherm model.Due to the simplicity of the synthetic procedure,the high removal efficiency for Pb(Ⅱ),as well as the easy separation of the adsorbent from water,the sepiolite nanocomposites have noteworthy application potential in the environmental field.

关 键 词：海泡石 改性 纳米复合材料 Pb(Ⅱ) 

分 类 号：X703.1[环境科学与工程—环境工程]