巯基功能化金纳米搅拌棒的制备及其对Pb(Ⅱ)和Cd(Ⅱ)的吸附检测  

Preparation of Thiol-groups Functionalized Gold Nanoparticles Stirring Bar and Its Application in Determination of Pb(Ⅱ) and Cd(Ⅱ)

作　　者：刘海霞[1,2] 饶红红 张丽[1,2] 郑艳萍 刘芳[1,2] 赵国虎 LIU Hai-xia;RAO Hong-hong;ZHANG Li;ZHENG Yan-ping;LIU Fang;ZHAO Guo-hu(School of Chemistry and Environmental Engineering,Lanzhou City University,Lanzhou 730070,China;Provincical Key Laboratory of Gansu Higher Education for City Environmental Pollution Control,Lanzhou 730070,China)

机构地区：[1]兰州城市学院化学与环境工程学院,甘肃兰州730070 [2]"城市环境污染控制"甘肃省高校省级重点实验室,甘肃兰州730070

出　　处：《分析测试学报》2018年第7期839-843,共5页Journal of Instrumental Analysis

基　　金：国家自然科学基金资助项目(21765013);兰州城市学院青年教师科研资助项目(LZCU-QN2016-01)兰州城市学院重点学科资助项目;甘肃省自然科学基金项目(17JR5RA005)

摘　　要：为实现金纳米粒子(AuNPs)对环境水体中重金属离子的选择性吸附,以刻饰不锈钢丝为基体,采用化学沉积法在刻蚀不锈钢丝表面沉积AuNPs,再用自组装法将1,8-辛二硫醇修饰于AuNPs上,制备了一种以巯基功能化金纳米为吸附剂的金属搅拌棒(AuNPs-SH-SBSE)。采用电感耦合等离子发射光谱仪(ICPOES)为检测手段,以常见的金属离子Pb(Ⅱ)和Cd(Ⅱ)为例,评价了金属搅拌棒的萃取分离性能。考察了吸附时间、pH值、解吸溶剂等因素对Pb(Ⅱ)和Cd(Ⅱ)吸附率的影响。结果表明,当吸附平衡时间为30min、pH 8.0,6.0 mL 1.5 mol/L HNO_3作洗脱剂时,Pb(Ⅱ)和Cd(Ⅱ)的吸附率分别达98.5%和87.4%。将该方法用于实际样品中痕量Pb(Ⅱ)和Cd(Ⅱ)的吸附检测,其线性范围分别为0.1~50 mg/L和0.2~20 mg/L,方法的检出限(S/N=3)分别为24 ng/L和3.6μg/L。在低、高2个浓度水平下进行加标回收实验,回收率分别为85.4%~105.0%和74.2%~97.8%,相对标准偏差(RSD,n=3)分别为3.8%~8.2%和4.2%~10.6%。该方法简单、快速、灵敏,可应用于环境水体中Pb(Ⅱ)和Cd(Ⅱ)的分离检测。In order to achieve the selective adsorption of heavy metal ions in environmental aqueous solution,a thiol-groups functionalized gold nanoparticles metal stirring bar（AuNPs-SH-SBSE）was fabricated by self-assembling 1,8-octanedithiol on surface of the etched stainless steel deposited with gold nanoparticles（AuNPs）. The extraction and separation properties of the stirring bar were evaluated with Pb（Ⅱ） and Cd（Ⅱ） by ICP-OES. Effects of adsorption time,p H value and desorption solvent on the adsorption were investigated. The results showed that,using equilibrium time of30 min and an optimum p H of 8. 0,6. 0 mL 1. 5 mol/L HNO3 as eluate,the maximal adsorption capacity of the stirring bar toward Pb（Ⅱ） and Cd（Ⅱ） reached to 98. 5% and 87. 4%,respectively.Under the optimal conditions,the method was successfully applied in the determination of trace Pb（Ⅱ） and Cd（Ⅱ） in real samples. There existed linearities for Pb（Ⅱ） and Cd（Ⅱ） in the ranges of0. 1-50 mg/L and 0. 2-20 mg/L,with their limits of detection（S/N = 3） of 24 ng/L and 3. 6 μg/L,respectively. The recoveries at two spiked levels of 2. 0 μg/L and 5. 0 μg/L were in the ranges of85. 4%-105. 0% and 74. 2%-97. 8%,with their RSDs（n = 3） of 3. 8%-8. 2% and 4. 2%-10. 6%,respectively. The method was simple,rapid and sensitive,and could be applied in the separation and detection of Pb（Ⅱ） and Cd（Ⅱ） in environmental water.

关 键 词：金纳米粒子 巯基功能化 搅拌棒吸附 重金属离子 

分 类 号：O657.3[理学—分析化学] X132[理学—化学]