title: Amino-functionalized mesoporous silica modified glassy carbon electrode for ultra-trace copper(II) determination.
abstract: This paper described a facile and direct electrochemical method for the determination of ultra-trace Cu(2+) by employing amino-functionalized mesoporous silica (NH2-MCM-41) as enhanced sensing platform. NH2-MCM-41 was prepared by using a post-grafting process and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and fourier transform infrared (FTIR) spectroscopy. NH2-MCM-41 modified glassy carbon (GC) electrode showed higher sensitivity for anodic stripping voltammetric (ASV) detection of Cu(2+) than that of MCM-41 modified one. The high sensitivity was attributed to synergistic effect between MCM-41 and amino-group, in which the high surface area and special mesoporous morphology of MCM-41 can cause strong physical absorption, and amino-groups are able to chelate copper ions. Some important parameters influencing the sensor response were optimized. Under optimum experimental conditions the sensor linearly responded to Cu(2+) concentration in the range from 5 to 1000 ng L(-1) with a detection limit of 0.9 ng L(-1) (S/N=3). Moreover, the sensor possessed good stability and electrode renewability. In the end, the proposed sensor was applied for determining Cu(2+) in real samples and the accuracy of the results were comparable to those obtained by inductively coupled plasma optical emission spectrometry (ICP-OES) method.
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu, 215123, PR China.
authors.forename: Xingxin
authors.initials: X
authors.lastname: Dai
authors.affiliation: Department of Quartermaster Engineering, Jilin University, No. 5333, Xi'an Road, Changchun 130062, PR China.
authors.forename: Fagui
authors.initials: F
authors.lastname: Qiu
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu, 215123, PR China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Zhou
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu, 215123, PR China; The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, PR China. Electronic address: yumeilong@suda.edu.cn.
authors.forename: Yumei
authors.initials: Y
authors.lastname: Long
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu, 215123, PR China. Electronic address: liweifeng@suda.edu.cn.
authors.forename: Weifeng
authors.initials: W
authors.lastname: Li
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu, 215123, PR China.
authors.forename: Yifeng
authors.initials: Y
authors.lastname: Tu
mesh_terms: D000818:Animals; D001628:Beverages / Q000032:analysis; D002244:Carbon / Q000737:chemistry; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D003300:Copper / Q000032:analysis* / Q000097:blood; D055664:Electrochemical Techniques; D004566:Electrodes; D005618:Fresh Water / Q000032:analysis; D016062:Porosity; D051381:Rats; D012822:Silicon Dioxide / Q000737:chemistry
chemical_list: C509968:MCM-41; D002244:Carbon; D012822:Silicon Dioxide; D003300:Copper
keywords: Amino-functionalized; Anodic stripping voltammetry; Copper; Mesoporous silica; Sensor