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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
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刘海霞,饶红红,张丽,郑艳萍,刘芳,赵国虎 1.兰州城市学院化学与环境工程学院2.“城市环境污染控制”甘肃省高校省级重点实验室 
基金项目: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);甘肃省自然科学基金项目(17JR5RA005);兰州城市学院重点学科资助项目
中文摘要: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(ICP-OES)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30 min、pH 80,60 mL 15 mol/L HNO3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6 μg/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。
中文关键词:金纳米粒子  巯基功能化  搅拌棒吸附  重金属离子
 
Preparation of Thiol groups Functionalized Gold Nanoparticles Stirring Bar and Its Application in Determination of Pb(Ⅱ) and Cd(Ⅱ)
Abstract: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,pH value and desorption solvent on the adsorption were investigated.The results showed that,using equilibrium time of 30 min and an optimum pH 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 of 0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 of 85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.
Key Words:gold nanoparticles  thiol groups functionalized  stir bar sorption  heavy mental ions
引用本文:刘海霞,饶红红,张丽,郑艳萍,刘芳,赵国虎.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[J].分析测试学报,2018,37(7):839-843.
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