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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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 |
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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 80,60 mL 15 mol/L HNO3作洗脱剂时,Pb(Ⅱ) 和Cd(Ⅱ)的吸附率分别达985%和874%。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01~50 mg/L和02~20 mg/L,方法的检出限(S/N=3)分别为24 ng/L和36 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854%~1050%和742%~978%,相对标准偏差(RSD,n=3)分别为38%~82%和42%~106%。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 |
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Preparation of Thiol groups Functionalized Gold Nanoparticles Stirring Bar and Its Application in Determination of Pb(Ⅱ) and Cd(Ⅱ) |
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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 80,60 mL 15 mol/L HNO3 as eluate,the maximal adsorption capacity of the stirring bar toward Pb(Ⅱ) and Cd(Ⅱ) reached to 985% and 874%,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 01-50 mg/L and 02-20 mg/L,with their limits of detection(S/N=3) of 24 ng/L and 36 μg/L,respectively.The recoveries at two spiked levels of 20 μg/L and 50 μg/L were in the ranges of 854%-1050% and 742%-978%,with their RSDs(n=3) of 38%-82% and 42%-106%,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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