Molecularly Imprinted Room Temperature Phosphorescent Optosensors for Environmental Pollutants

2012 ◽  
pp. 377-406
Keyword(s):  
Room Temperature ◽  
Environmental Pollutants ◽  
Molecularly Imprinted

scholarly journals Preparation and Gas Sensing Properties of PANI/SnO2 Hybrid Material

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1360
Author(s):  
Qiaohua Feng ◽  
Huanhuan Zhang ◽  
Yunbo Shi ◽  
Xiaoyu Yu ◽  
Guangdong Lan
Keyword(s):  
Hybrid Material ◽  
Room Temperature ◽  
Tin Dioxide ◽  
Gas Adsorption ◽  
Gas Sensing ◽  
Oxidative Polymerization ◽  
Environmental Pollutants ◽  
Decomposition Temperature ◽  
Benzene Vapor ◽  
Thermo Gravimetric Analyzer

A sensor operating at room temperature has low power consumption and is beneficial for the detection of environmental pollutants such as ammonia and benzene vapor. In this study, polyaniline (PANI) is made from aniline under acidic conditions by chemical oxidative polymerization and doped with tin dioxide (SnO2) at a specific percentage. The PANI/SnO2 hybrid material obtained is then ground at room temperature. The results of scanning electron microscopy show that the prepared powder comprises nanoscale particles and has good dispersibility, which is conducive to gas adsorption. The thermal decomposition temperature of the powder and its stability are measured using a differential thermo gravimetric analyzer. At 20 °C, the ammonia gas and benzene vapor gas sensing of the PANI/SnO2 hybrid material was tested at concentrations of between 1 and 7 ppm of ammonia and between 0.4 and 90 ppm of benzene vapor. The tests show that the response sensitivities to ammonia and benzene vapor are essentially linear. The sensing mechanisms of the PANI/SnO2 hybrid material to ammonia and benzene vapors were analyzed. The results demonstrate that doped SnO2 significantly affects the sensitivity, response time, and recovery time of the PANI material.

Iodinated molecularly imprinted polymer for room temperature phosphorescence optosensing of fluoranthene

2005 ◽  
pp. 3224 ◽  
Author(s):  
A. Salinas-Castillo ◽  
I. Sánchez-Barragán ◽  
J. M. Costa-Fernández ◽  
R. Pereiro ◽  
A. Ballesteros ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Room Temperature ◽  
Imprinted Polymer ◽  
Room Temperature Phosphorescence ◽  
Molecularly Imprinted

scholarly journals Lignin Biopolymer for the Synthesis of Iron Nanoparticles and the Composite Applied for the Removal of Methylene Blue

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3847
Author(s):  
Fang-Yi Peng ◽  
Pei-Wen Wang ◽  
Weisheng Liao ◽  
Ing-Song Yu
Keyword(s):  
Methylene Blue ◽  
Aqueous Solutions ◽  
Environmental Remediation ◽  
Present Method ◽  
Room Temperature ◽  
Iron Nanoparticles ◽  
Reduction Method ◽  
Environmental Pollutants ◽  
Borohydride Reduction ◽  
Natural Polymer

In the current study, lignin, an abundant natural polymer, was dissolved in ethylene glycol and acidic H2O to form nanoscale lignin. Then, zero-valent iron (ZVI) nanoparticles were synthesized in nanoscale lignin, producing a nZVI/n-lignin composite, via the borohydride reduction method. The use of nZVI/n-lignin for environmental remediation was tested by the removal of methylene blue in aqueous solutions at room temperature. The nZVI/n-lignin composite achieved a higher methylene blue removal ratio than that achieved by traditional nZVIs. Moreover, its excellent dispersibility in water and stability against oxidation in the air were observed. The functions of the nanoscale lignin in the composite material are (1) prevention of further growth and aggregation of the nZVI nanoparticles, (2) protection of nZVI from serious oxidation by H2O/O2, and (3) allowing better dispersibility of nZVI in aqueous solutions. These three functions are important for the field applications of nZVI/n-lignin, namely, to travel long distances before making contact with environmental pollutants. The present method for producing nZVI/n-lignin is straightforward, and the combination of nZVI and lignin is an efficient and environmentally friendly material for environmental applications.

scholarly journals Removal of Triolein Lipid From Aqueous System by Molecularly Imprinted Chitosan and Its Derivative

KIMIKA ◽  
2018 ◽  
Vol 29 (1) ◽  
pp. 11-16
Author(s):  
Soma Chakraborty ◽  
Xyza Jane Templonuevo
Keyword(s):  
Contact Angle ◽  
Water Droplet ◽  
Room Temperature ◽  
Binding Capacity ◽  
Aqueous System ◽  
Molecularly Imprinted ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Palmitoyl Glycerol ◽  
Octanoyl Chloride

Chitosan was molecularly imprinted to remove triolein (a model lipid triacylglyceride) from water. Molecularly-imprinted chitosan (chitosan-MIP) was synthesized by crosslinking it with glutaraldehyde in the presence of triolein as the template at 50°C for 2h. MIPs of octanoyl derivative of chitosan(Oct-MIP) were also prepared by similar method. Octanoyl chitosan was synthesized by N-acylation of chitosan using octanoyl chloride at room temperature for 12h. Contact angle measurements of water droplet on chitosan and octanoyl chitosan revealed increased hydrophobicity of octanoyl derivative of chitosan. FTIR spectroscopy was used to characterize the derivative and the MIPs. All the synthesized polymers. Oct-MIP and chitosan-MIP could imprint approximately 77% and 66% of triolein template, respectively. Binding experiments revealed that Oct-MIP exhibit higher triolein binding capacity than corresponding non-acylated polymers. In 6h, 1mg of Oct-MIP and chitosan-MIP could rebind 534.50µg and 380.35µg of triolein respectively. Non Imprinted octanoyl chitosan and chitosan bound 272µg and 198.24µg triolein respectively. Both types of MIPs could also bind a triolein analog (1,3-dioleoyl-2-palmitoyl glycerol).

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