title: Study on the application of reduced graphene oxide and multiwall carbon nanotubes hybrid materials for simultaneous determination of catechol, hydroquinone, p-cresol and nitrite.
abstract: In this paper, the reduced graphene oxide and multiwall carbon nanotubes hybrid materials (RGO-MWNTs) were prepared and a strategy for detecting environmental contaminations was proposed on the basis of RGO-MWNTs modified electrode. The hybrid materials were characterized by the scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and N(2) sorption-desorption isotherms. Due to the excellent catalytic activity, enhanced electrical conductivity and high surface area of the RGO-MWNTs, the simultaneous measurement of hydroquinone (HQ), catechol (CC), p-cresol (PC) and nitrite (NO(2)(-)) with four well-separate peaks was achieved at the RGO-MWNTs modified electrode. The linear response ranges for HQ, CC, PC and NO(2)(-) were 8.0-391.0 μM, 5.5-540.0 μM, 5.0-430.0 μM and 75.0-6060.0 μM, correspondingly, and the detection limits (S/N=3) were 2.6 μM, 1.8 μM, 1.6 μM and 25.0 μM, respectively. The outstanding film forming ability of RGO-MWNTs hybrid materials endowed the modified electrode enhanced stability. Furthermore, the fabricated sensor was applied for the simultaneous determination of HQ, CC, PC and NO(2)(-) in the river water sample.
authors.affiliation: Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
authors.forename: Fangxin
authors.initials: F
authors.lastname: Hu
authors.forename: Shihong
authors.initials: S
authors.lastname: Chen
authors.forename: Chengyan
authors.initials: C
authors.lastname: Wang
authors.forename: Ruo
authors.initials: R
authors.lastname: Yuan
authors.forename: Dehua
authors.initials: D
authors.lastname: Yuan
authors.forename: Cun
authors.initials: C
authors.lastname: Wang
mesh_terms: D002396:Catechols / Q000032:analysis*; D003408:Cresols / Q000032:analysis*; D004553:Electric Conductivity; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D006873:Hydroquinones / Q000032:analysis*; D057230:Limit of Detection; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009573:Nitrites / Q000032:analysis*; D010087:Oxides / Q000737:chemistry; D056951:Photoelectron Spectroscopy; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D002396:Catechols; D003408:Cresols; D006873:Hydroquinones; D037742:Nanotubes, Carbon; D009573:Nitrites; D010087:Oxides; D014874:Water Pollutants, Chemical; C032538:4-cresol; D006108:Graphite; C034221:catechol; C031927:hydroquinone