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Quantum Dot Architectures on Electrodes for Photoelectrochemical Analyte Detection
Published in Grunwald Peter, Biocatalysis and Nanotechnology, 2017
Mark Riedel, Daniel Schäfer, Fred Lisdat
In addition to natural recognition elements a first approach shows the combination of an artificial recognition element with a QD-based PEC sensor system. Therefore, Wang et al. (2014b) have attached a molecularly imprinted polymer (MIP) to a CdS- graphene nanocomposite-modified FTO electrode. MIPs are made by polymerization of functional monomers and cross-linkers around a template molecule (the later analyte). After the dissolution of the template cavities remain, which mimic the binding function of an antibody and allow a specific recognition of the analyte. Wang et al. (2014b) have polymerized polypyrrole MIPs for the binding of p-aminophenol (see Fig. 14.13 C). The bound analyte is oxidized at the valence band of the QDs upon illumination, resulting in an enhanced anodic photocurrent with increasing concentration of bound p-aminophenol. The sensor shows a linear response in the range from 50 nM to 3.5 μM p-aminophenol with a good reproducibility and selectivity against similar compounds such as phenol, 2-aminophenol, 3-aminophenol, 4-aminobenzene sulfanilic acid, 4-acetamidophenol, 4-nitrophenol, 4-chlorophenol, and 4-chloroaniline (Wang et al., 2014b).
Thermochemistry, Electrochemistry, and Solution Chemistry
Published in W. M. Haynes, David R. Lide, Thomas J. Bruno, CRC Handbook of Chemistry and Physics, 2016
W. M. Haynes, David R. Lide, Thomas J. Bruno
Name 2-Aminophenol 3-Aminophenol 4-Aminophenol 3-Aminopropanenitrile 4-Amino-3,5,6-trichloro-2pyridinecarbox Amiodarone Amitriptyline Amobarbital Aniline Aniline-2-carboxylic acid Aniline-3-carboxylic acid Aniline-4-carboxylic acid Apomorphine Arecoline -Arginine Mol. form. C6H7NO C6H7NO C6H7NO C3H6N2 C6H3Cl3N2O2 C25H29I2NO3 C20H23N C11H18N2O3 C6H7N C7H7NO2 C7H7NO2 C7H7NO2 C17H17NO2 C8H13NO2 C6H14N4O2 Step 1 2 1 2 1 2 t/ºC 20 20 20 20 25 25 20 25 25 25 25 25 25 25 25 25 pKa 4.78 9.97 4.37 9.82 5.48 10.30 7.80 3.6 6.56 9.4 8.0 4.87 2.17 4.85 3.07 4.79 2.50 4.87 7.0 8.92 6.84 1.82 8.99 12.5 1.62 2.70 4.26 9.58 4.04 11.7 2.1 8.80 1.99 3.90 9.90 5.5 9.6 12.2 8.55 8.2 6.70 11.29 7.43 4.01 14.90 13a 4.31 8.83 4.76 4.57 0.80 5.11 2.50 6.31 2.97 9.83 9.43 4.66 1.3 0.70 Benzenethiol p-Benzidine Name Mol. form. C6H6S C12H12N2 C7H6N2 C7H6O2 C6H5N3 C9H9NO3 C22H25N3O C7H9N C13H13N C12H11N C5H11NO2 C2H7N5 C6H13NO4 C12H6Cl4O2S C10H19N C30H23BrO4 C2H3BrO2 C6H6BrN C6H6BrN C6H6BrN C7H5BrO2 C7H5BrO2 C7H5BrO2 C21H14Br4O5S C21H16Br2O5S C8H10BrN C6H5BrO C6H5BrO C6H5BrO C19H10Br4O5S C3H5BrO2 C5H4BrN C9H6BrN C27H28Br2O5S C23H26N2O4 C4H12N2 C4H10O4 C4H8O2 C4H6O2 C4H6O2 C4H11N C4H11N C4H11N C10H15N C11H14O2 C11H14O2 C11H14O2 C10H21N C10H14O C10H14O C10H14O C9H19N C7H12O4 C4H4O2 C9H15NO3S Step t/ºC 25 1 20 2 20 25 25 20 25 1 2 25 25 25 0 1 2 2 20 1 2 25 21 25 25 25 25 25 25 25
Multisubstrate specific flavin containing monooxygenase from Chlorella pyrenoidosa with potential application for phenolic wastewater remediation and biosensor application
Published in Environmental Technology, 2018
The broad substrate specificity of phenol hydroxylase was determined in addition to phenol against isomeric diphenols (catechol, resorcinol, quinol), isomeric methylphenols (o-cresol, m-cresol, p-cresol), halogen-substituted phenols (2-chlorophenol, 4-chlorophenol, 2,4-chlorophenol, 2-aminophenol, 3-aminophenol, p-bromophenol, 4-nitrophenol), p and m-hydroxybenzaldehyde, p-hydroxylbenzoic acid and 4-nitrophenol. Phenol hydroxylase activity was analysed in an assay mixture containing 50 mM potassium phosphate buffer solution (pH 7.2), 500 µg protein, 1.5 µM substrate, 1.5 µM NADPH incubated in a water bath at 35°C. The substrate specificity of phenol hydroxylase was measured by disappearance of its cosubstrate NADPH (decrease of absorbance at 340 nm) as per Neujhar and Varga [32].
Experimental and modelling study of industrial phenolic wastewater treatment by packed bed adsorption on coal-based and bagasse-based fly ash
Published in Indian Chemical Engineer, 2022
The representative plots of amount adsorbed on fly ash C with respect to the initial concentration of all phenols are given in Figure 3 for the temperature of 30°C. Similar trends were obtained in the case of adsorption of phenol, catechol, resorcinol, hydroquinone, 2-aminophenol and 3-aminophenol. The amount of adsorption increases with an increase in the initial concentration of phenols (Figure 3), which is in agreement with the finding that the rate of uptake of adsorbate is found to increase nonlinearly with increasing concentration of solute [8]. However, the higher percentage removal at low concentration is attributed to the availability of greater surface area.