Selective Colorimetric Detection of Nitrite in Water using Chitosan Stabilized Gold Nanoparticles Decorated Reduced Graphene oxide

Abstract

Excess nitrite (NO2 -) concentrations in water supplies is considered detrimental to the environment and human health, and is associated with incidence of stomach cancer. In this work, the authors describe a nitrite detection system based on the synthesis of gold nanoparticles (AuNPs) on reduced graphene oxide (rGO) using an aqueous solution of chitosan and succinic acid. The AuNPs-rGO nanocomposite was confirmed by different physicochemical characterization methods including transmission electron microscopy, elemental analysis, X-ray diffraction, UV-visible (UV-vis) and Fourier transform infrared spectroscopy. The AuNPs-rGO nanocomposite was applicable to the sensitive and selective detection of NO2 − with increasing concentrations quantifiable by UV–vis spectroscopy and obvious to the naked eye. The color of the AuNPs-rGO nanocomposite changes from wine red to purple with the addition of different concertation of NO2 −. Therefore, nitrite ion concentrations can be quantitatively detected using AuNPs-rGO sensor with UV-vis spectroscopy and estimated with the naked eye. The sensor is able to detect NO2 − in a linear response ranging from 1 to 20 μM with a detection limit of 0.1 μM by spectrophotometric method. The as-prepared AuNPs-rGO nanocomposite shows appropriate selectivity towards NO2 − in the presence of potentially interfering metal anions.

Formulation and Evaluation of Chitosan Nanoparticles Coated Graphene- Gold Nanoparticles for Controlled Released of Anticancer Drug Vincristine

“…Recently, researcher reported that F-GE is able of reducing tumor-cell growth in vivo and in vitro (Battogtokh et al,2017;Boyles et al,2015). In the present report, we have exposed for the first time that CSNPs coated F-GE/AuNPs xhibit drug delivery applications and determined the mechanism of action in different approaches (Osváth et al, 2015;Sayed et al, 2015;Yang et al, 2014;Hashemi et al,2017;Muddineti et al,2015;Duan et al,2014;Amanulla et al,2017;Bao et al,2015).…”

Design and Investigation of Optical Properties of N-(Rhodamine-B)-Lactam-Ethylenediamine (RhB-EDA) Fluorescent Probe

“…Many probe-based sensors intended for on-site detection using organic chromophores, small fluorescent organic molecules [ 10 , 11 , 12 ], Quantum Dots (QDs) [ 13 , 14 ], conjugated polymers [ 15 ], and DNA-zymes [ 16 ] have been developed for fluorescent, colorimetric [ 17 , 18 , 19 ], and electrochemical detection of Ag + [ 20 , 21 ]. However, some drawbacks still exist, such as poor aqueous solubility [ 18 , 22 ], bad stability, low sensitivity, large physical size, complicated synthesis procedures, high toxicity, and cross-sensitivity toward other metal ions, especially to Hg 2+ [ 22 , 23 , 24 , 25 ].…”

Recent Advancement of the Sensors for Monitoring the Water Quality Parameters in Smart Fisheries Farming

“…Hence, it is necessary to monitor and manage nitrate concentration in water using sensors for efficient and economic farming. Some researchers used graphene-based electrochemical sensing methods [45][46][47][48][49][50][51][52], whereas some researchers used the colorimetric [53] method for detecting nitrate in water samples. A summary of the existing nitrate sensors is included in Table 6.…”