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Carbon dots as absorbance promoter probes for detection of Cu(ii) ions in aqueous solution: central composite design approach
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2018-01-12 00:00:00 , DOI: 10.1039/c7pp00454k S. A. R. Shahamirifard 1, 2, 3, 4 , M. Ghaedi 1, 2, 3, 4 , M. Montazerozohori 1, 2, 3, 4 , A. Masoudiasl 1, 2, 3, 4
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2018-01-12 00:00:00 , DOI: 10.1039/c7pp00454k S. A. R. Shahamirifard 1, 2, 3, 4 , M. Ghaedi 1, 2, 3, 4 , M. Montazerozohori 1, 2, 3, 4 , A. Masoudiasl 1, 2, 3, 4
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In this work, the use of carbon dots (CDs) as a complexing agent and sensitizer in a polymeric matrix for determination of copper(II) by UV-vis spectroscopy is reported for the first time. A new and highly selective Schiff base, namely, (N′,N′′′E,N′,N′′′E)-N′,N′′′-((((2-hydroxypropane-1,3-diyl)bis(oxy))bis(2,1-phenylene))bis(methan-ylylidene))di(isonicotinohydrazide) (NHBMDI), was also incorporated in the polymeric matrix. For the first time, the membrane composition of the proposed optical sensor including NHBMDI as the ionophore, tetraphenylborate (NaTPB) as the anionic additive, dibutyl phthalate (DBP) as the plasticizer and polyvinyl chloride (PVC) as the immobilizer was optimized through central composite design combined with the desirability function approach (DFA) because this method saves material and time consumption and is therefore cost effective. The synthesized CDs were characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The fluorescence quantum yield of the synthesized CDs was found to be 6.4% by using quinine sulfate as the reference. The characterization of the prepared membrane sensor was investigated by field emission scanning electron microscope (FE-SEM) and atomic force microscopy (AFM).The response of the optode was based on the strong absorbance of NHBMDI and CDs upon exposure to Cu(II) ions with the maximum wavelength at 371 nm. The proposed sensor exhibited a linear response in the concentration range of 1.2 × 10−6–4.56 × 10−5 mol L−1 with a detection limit of 7.1 × 10−7 mol L−1, which is lower than U.S. Environmental Protection Agency's defined limit (20 μM). Furthermore, the proposed optode displayed good selectivity toward Cu(II) ions in comparison with common coexisting cations with satisfactory repeatability and reproducibility. The sensor was applied successfully for determination of copper(II) ions in water samples.
中文翻译：
碳点作为吸收促进剂探针，用于检测水溶液中的Cu（ii）离子：中心复合设计方法
在这项工作中，首次报道了使用碳点（CDs）作为聚合物基体中的络合剂和敏化剂，通过紫外可见光谱法测定铜（II）的情况。一种新的，高度选择性的席夫碱，即（N '，N ''' E，N '，N ''' E）-N '，N也掺入了'''-（（（（（（2-2-hydroxypropane-1,3-diyl）bis（oxy））bis（2,1-phenylene））bis（methan-ylydenne））di（异烟酰胺）（NHBMDI）在聚合物基质中。首次通过中央复合材料对拟议的光学传感器的膜组成进行了优化，其中包括NHBMDI作为离子载体，四苯基硼酸酯（NaTPB）作为阴离子添加剂，邻苯二甲酸二丁酯（DBP）作为增塑剂和聚氯乙烯（PVC）作为固定剂。设计与可取性函数方法（DFA）相结合，因为这种方法节省了材料和时间，因此具有成本效益。合成的CD通过透射电子显微镜（TEM）和扫描电子显微镜（SEM）表征。使用硫酸奎宁作为参照，发现合成的CD的荧光量子产率为6.4％。II）最大波长在371nm的离子。所提出的传感器在1.2×10 -6 –4.56×10 -5 mol L -1的浓度范围内表现出线性响应，检出限为7.1×10 -7 mol L -1，低于美国环境保护署的定义的极限（20μM）。此外，与常见的共存阳离子相比，拟议的光电二极管对Cu（II）离子具有良好的选择性，并具有令人满意的可重复性和可再现性。该传感器已成功应用于测定水样中的铜（II）离子。
更新日期：2018-01-12
中文翻译：
碳点作为吸收促进剂探针，用于检测水溶液中的Cu（ii）离子：中心复合设计方法
在这项工作中，首次报道了使用碳点（CDs）作为聚合物基体中的络合剂和敏化剂，通过紫外可见光谱法测定铜（II）的情况。一种新的，高度选择性的席夫碱，即（N '，N ''' E，N '，N ''' E）-N '，N也掺入了'''-（（（（（（2-2-hydroxypropane-1,3-diyl）bis（oxy））bis（2,1-phenylene））bis（methan-ylydenne））di（异烟酰胺）（NHBMDI）在聚合物基质中。首次通过中央复合材料对拟议的光学传感器的膜组成进行了优化，其中包括NHBMDI作为离子载体，四苯基硼酸酯（NaTPB）作为阴离子添加剂，邻苯二甲酸二丁酯（DBP）作为增塑剂和聚氯乙烯（PVC）作为固定剂。设计与可取性函数方法（DFA）相结合，因为这种方法节省了材料和时间，因此具有成本效益。合成的CD通过透射电子显微镜（TEM）和扫描电子显微镜（SEM）表征。使用硫酸奎宁作为参照，发现合成的CD的荧光量子产率为6.4％。II）最大波长在371nm的离子。所提出的传感器在1.2×10 -6 –4.56×10 -5 mol L -1的浓度范围内表现出线性响应，检出限为7.1×10 -7 mol L -1，低于美国环境保护署的定义的极限（20μM）。此外，与常见的共存阳离子相比，拟议的光电二极管对Cu（II）离子具有良好的选择性，并具有令人满意的可重复性和可再现性。该传感器已成功应用于测定水样中的铜（II）离子。
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