Nitrite sensing composite systems based on a core-shell emissive-superamagnetic structure: Construction, characterization and sensing behavior.
Two recyclable nitrite sensing composite samples were designed and constructed through a core-shell structure, with Fe3O4nanoparticles as core, silica molecular sieve MCM-41 as shell and two rhodamine derivatives as chemosensors, respectively. These samples and their structure were identified with their electron microscopy images, N2adsorption/desorption isotherms, magnetic response, IR spectra and thermogravimetric analysis. Their nitrite sensing behavior was discussed based on emission intensity quenching, their limit of detection was found as low as 1.2μM. Further analysis suggested a static sensing mechanism between nitrite and chemosensors through an additive reaction between NO+and chemosensors. After finishing their nitrite sensing, these composite samples and their emission could be recycled and recovered by sulphamic acid.
Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou, Jiangsu 213000, China.
Yan
Y
Yang
School of Environmental and Safety Engineering, Changzhou University, Changzhou, Jiangsu 213000, China.
Liang
L
Liu
Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou, Jiangsu 213000, China.
Jianhua
J
Zha
Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou, Jiangsu 213000, China. Electronic address: nyyuan@cczu.edu.cn.
Ningyi
N
Yuan
Core-shell structure; Emission quenching; Nitrite ion; Rhodamine probe