功能化凹凸棒吸附材料的制备及其对重金属废水中Pb^(2+)的吸附行为  

Preparation of Functional Attapulgite Composite and Its Adsorption Behaviors for Congo Red

作　　者：廖晓峰 钟静萍 陈云嫩[1] 邱廷省[1] 任嗣利 LIAO Xiao-feng;ZHONG Jing-ping;CHEN Yun-nen;QIU Ting-sheng;REN Si-li(Jiangxi Province Key Laboratory of Mining and Metallurgy Environmental Pollution Control,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学江西省矿冶环境污染控制重点实验室,赣州341000

出　　处：《环境科学》2022年第1期387-397,共11页Environmental Science

基　　金：国家重点研发计划项目(2018YFC1903401);江西省自然科学重点基金项目(20202ACBL203009)。

摘　　要：重金属离子废水会对人体健康和环境造成严重威胁,吸附法是去除重金属废水中重金属离子的重要方法.对凹凸棒土(ATP)接枝磁性Fe_(3)O_(4)纳米粒子,再使用3-氨基丙基三乙氧基硅烷(APTES)进行改性,制备了具有良好吸附性能的凹凸棒复合纳米材料吸附剂(ATP-Fe_(3)O_(4)-APTES),并将其用于重金属离子废水的处理.利用FT-IR、XRD、SEM及TEM、BET吸脱附法、Zeta电位和VSM分析等方法对材料的结构和表面性质进行了分析表征.研究了所制备材料对重金属离子Pb^(2+)的吸附行为,考察了溶液pH、吸附时间、吸附温度和Pb^(2+)初始浓度等因素对材料吸附性能的影响作用,探讨了吸附过程的吸附动力学、吸附等温线和吸附热力学行为.结果表明,材料对Pb^(2+)的最大吸附容量为129.32 mg·g^(-1).吸附过程符合准二级动力学模型和Langmuir吸附等温式,表明材料对Pb^(2+)的吸附是单分子层化学吸附;吸附热力学分析表明,吸附过程是一个自发的吸热过程,吸附驱动力主要来自吸附材料表面—NH_(2)与Pb^(2+)之间的配位作用.综上,所制备功能化磁性凹凸棒吸附材料对重金属离子具有良好的吸附性能,有望用于重金属离子废水的处理.Heavy metal ion wastewater poses a serious threat to human health and the environment. The adsorption method is an important method to remove heavy metal ions from heavy metal wastewater. Magnetic attapulgite(ATP) composite nanomaterials with excellent adsorption properties were prepared by grafting the Fe_(3)O_(4)nanoparticles and using 3-aminopropyl triethoxy silane(APTES) modification. The prepared ATP-Fe_(3)O_(4)-APTES materials were used as adsorbents and applied to the treatment of heavy metal ion wastewater. The structure and surface properties of the materials were characterized by FT-IR, XRD, SEM, TEM, and BET characterization, Zeta potential, and VSM. The effects of pH, adsorption time, adsorption temperature, and initial concentration of Pb^(2+)on the adsorption properties of the ATP-Fe_(3)O_(4)-PEI materials were investigated. The results show that the maximum adsorption capacity of the materials for Pb^(2+)was 129.32 mg·g^(-1)under optimum conditions. The adsorption process conformed to the pseudo second order kinetic model and Langmuir adsorption isotherm, which indicates that the adsorption of Pb^(2+)is a monolayer chemical adsorption and a spontaneous endothermic process. The driving force of adsorption mainly comes from the coordination between the amino group(—NH_(2)) on the ATP-Fe_(3)O_(4)-APTES surface and Pb^(2+). These results indicate that the functionalized magnetic attapulgite adsorbent has good adsorption properties for heavy metal ions and is expected to be used in the treatment of heavy metal ion wastewater.

关 键 词：凹凸棒 Pb^(2+) Fe_(3)O_(4) 3-氨基丙基三乙氧基硅烷(APTES) 吸附 重金属离子废水 

分 类 号：X703[环境科学与工程—环境工程]