Functional Microgel for Selective and Sensitive Colorimetric Detection of Fe2+ Ions in HEPES Buffer Aqueous Solutions

2021 ◽  
Author(s):  
Weiming Ji ◽  
Shunni Dong ◽  
Wei Fan ◽  
Chao Lv ◽  
Jingjing Nie ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Colorimetric Detection ◽  
Hepes Buffer

Humic Acid Functionalized - Silver Nanoparticles as Nanosensor for Colorimetric Detection of Copper (II) Ions in Aqueous Solutions

2020 ◽  
Vol 831 ◽  
pp. 142-150
Author(s):  
Edgar Clyde R. Lopez ◽  
Michael Angelo Zafra ◽  
Jon Nyner L. Gavan ◽  
Emil David A. Villena ◽  
Francis Eric P. Almaquer ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Humic Acid ◽  
Aqueous Solutions ◽  
Limit Of Detection ◽  
Colorimetric Detection ◽  
Hydrodynamic Diameter ◽  
Limit Of Quantification ◽  
Local Surface Plasmon Resonance ◽  
Optical Absorbance ◽  
Absorbance Spectra

Humic acid - functionalized silver nanoparticles (HA-AgNPs) were successfully synthesized and used to detect Cu (II) ions in aqueous solutions. The HA-AgNPs was shown to have an average hydrodynamic diameter of 101.4 nm and a polydispersity index of 0.447. The absorbance spectra of HA-AgNPs showed the characteristic local surface plasmon resonance (LSPR) peak of AgNPs at 408.3 nm. Addition of Cu (II) in the HA-AgNPs led to their agglomeration as evidenced by the change in their surface morphology and their corresponding optical absorbance spectra. The synthesized HA-AgNPs showed a strong linear response for Cu (II) concentrations in the range of 0.00 – 1.25 mM with a limit of detection (LoD) of 4.4428 ± 0.1091 mg L-1, a limit of quantification (LoQ) of 14.8094 ± 0.3636 mg L-1, and a limit of blank (LoB) of 0.1214 ± 0.0065 mg L-1. Statistical analysis showed that this calibration curve could be used to quantify Cu (II) concentrations within a 95% confidence level. Furthermore, HA-AgNPs was found to be selective for Cu (II) detection based on the selectivity study against common metal ions found in drinking water. This shows that the synthesized HA-AgNPs can be used as an environment-friendly colorimetric nanosensor for rapid and point-of-need quantification of Cu (II) ions in aqueous media.

Colorimetric detection of Cr3+ using tripolyphosphate modified gold nanoparticles in aqueous solutions

2012 ◽  
Vol 4 (5) ◽  
pp. 1259 ◽  
Author(s):  
Junwei Xin ◽  
Lijing Miao ◽  
Shougang Chen ◽  
Aiguo Wu
Keyword(s):  
Gold Nanoparticles ◽  
Aqueous Solutions ◽  
Colorimetric Detection

Selective colorimetric detection of nanomolar Cr (VI) in aqueous solutions using unmodified silver nanoparticles

2012 ◽  
Vol 166-167 ◽  
pp. 365-371 ◽  
Author(s):  
Aswathy Ravindran ◽  
M. Elavarasi ◽  
T.C. Prathna ◽  
Ashok M. Raichur ◽  
N. Chandrasekaran ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Solutions ◽  
Colorimetric Detection

scholarly journals Selective and colorimetric detection of Ba2+ ions in aqueous solutions using 11-mercaptoundecylphosphonic acid functionalized gold nanoparticles

RSC Advances ◽  
2017 ◽  
Vol 7 (50) ◽  
pp. 31611-31618 ◽  
Author(s):  
Blanca A. García Grajeda ◽  
Samuel G. Soto Acosta ◽  
Sergio A. Aguila ◽  
Héctor Peinado Guevara ◽  
Marta E. Díaz-García ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Gold Nanoparticles ◽  
Aqueous Solutions ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Selective Detection ◽  
Functionalized Gold Nanoparticles

In this paper we describe a simple colorimetric method for the sensitive and selective detection of Ba2+ ions, using 11-mercaptoundecylphosphonic acid functionalized gold nanoparticles (AuNPs–MPA) in aqueous solution.

Highly sensitive colorimetric detection of HgII and CuII in aqueous solutions: from amino acids toward solid platforms

The Analyst ◽  
2015 ◽  
Vol 140 (3) ◽  
pp. 744-749 ◽  
Author(s):  
Jooyoung Park ◽  
Byunggyu In ◽  
Lok Nath Neupane ◽  
Keun-Hyeung Lee
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Colorimetric Detection ◽  
Selective Detection ◽  
Highly Sensitive ◽  
Fluorescence Change

A chemosensor (NBD-H) based on an amino acid with 7-nitro-2,1,3-benzoxadiazole was used for selective detection of HgII and CuII among 15 metal ions in aqueous solutions by a colorimetric change and fluorescence change.

Novel receptor for the rapid reaction and colorimetric detection of HSO3 − in aqueous solutions

2013 ◽  
Vol 29 (2) ◽  
pp. 236-238 ◽  
Author(s):  
Wen-long Yang ◽  
Qiao Li ◽  
Tai-bao Wei ◽  
You-ming Zhang ◽  
Qi Lin ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Colorimetric Detection ◽  
Rapid Reaction

Preparation of gold nanoparticles using pyridine-formaldehyde as a reducing agent and its application in high sensitivity colorimetric detection of Pb2+

2019 ◽  
Vol 11 (34) ◽  
pp. 4362-4369 ◽  
Author(s):  
Liling Lei ◽  
Haimei Song ◽  
Junhong Zhao ◽  
Qingxiang Yang ◽  
Zhijun Chen
Keyword(s):  
Gold Nanoparticles ◽  
Aqueous Solutions ◽  
Colorimetric Detection ◽  
High Sensitivity ◽  
Colorimetric Sensor ◽  
Reducing Agent ◽  
New Method

A new method for preparing AuNPs has been successfully developed by using pyridine-formaldehyde as reducing agent. The AuNPs were used in colorimetric sensor for detection of Pb2+ in aqueous solutions.

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