Highly selective colorimetric receptors for detection of fluoride ion in aqueous solution based on quinone-imidazole ensemble—Influence of hydroxyl group

2016 ◽  
Vol 237 ◽  
pp. 230-238 ◽  
Author(s):  
Palanisamy Jayasudha ◽  
Ramalingam Manivannan ◽  
Kuppanagounder P. Elango
Keyword(s):  
Aqueous Solution ◽  
Hydroxyl Group ◽  
Fluoride Ion

scholarly journals Synthesis of Zeolite from Carbothermal Reduction Electrolytic Manganese Residue for the Removal of Macrolide Antibiotics from Aqueous Solution

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2133 ◽  
Author(s):  
Xuli Li ◽  
Yue Zeng ◽  
Fangyuan Chen ◽  
Teng Wang ◽  
Yixin Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Carbothermal Reduction ◽  
Adsorption Process ◽  
Hydroxyl Group ◽  
Macrolide Antibiotics ◽  
Adsorption Sites ◽  
Electrolytic Manganese ◽  
Electrolytic Manganese Residue ◽  
Pseudo Second Order ◽  
The Fourier Transform

Zeolite analcime (EMANA) was synthesized through the hydrothermal method by using carbothermal reduction electrolytic manganese residue (CR-EMR). The structural properties of EMANA and CR-EMR were studied using various characterization techniques. After hydrothermal synthesis, the CR-EMR became super-microporous, and the surface area increased by 4.76 times than before. Among the various synthesized zeolites, 6 h-synthesized EMANA was selected as the best adsorbent for macrolide antibiotics in aqueous solution. The adsorption performance of EMANA on the adsorption capacity was examined by using various experimental parameters, such as contact time (0–24 h), initial concentration (50–300 mg/L), temperature (30–50 °C) and pH (3–13). The experimental results were also analyzed by the Langmuir and Freundlich adsorption models, with the latter obtaining better representation. The adsorption process could be described well by the pseudo-second-order model, even under a low concentration (50 mg/L). This result suggests that the adsorption process of macrolide antibiotics is due to chemisorption. According to the Fourier Transform infrared spectroscopy (FT-IR) results, the adsorption of zeolite was mainly due to its hydroxyl group, which played an important role during the adsorption process. Moreover, EMANA is more suitable for treatment of roxithromycin (ROX) than azithromycin (AZM), because ROX has more adsorption sites for the hydroxyl group.

Adsorptive removal of diclofenac sodium from aqueous solution by magnetic COF: Role of hydroxyl group on COF

2020 ◽  
Vol 603 ◽  
pp. 125238 ◽  
Author(s):  
Xin Mi ◽  
Shuangxi Zhou ◽  
Ziming Zhou ◽  
Mohammadtaghi Vakili ◽  
Yue Qi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Diclofenac Sodium ◽  
Hydroxyl Group ◽  
Adsorptive Removal

scholarly journals Zum Mechanismus der Hydroxylierungen mit molekularem Sauerstoff und Zinn(II)-Komplexen

1969 ◽  
Vol 24 (5) ◽  
pp. 583-588 ◽  
Author(s):  
Volker Ullrich ◽  
Hansjürgen Staudinger
Keyword(s):  
Aqueous Solution ◽  
New Species ◽  
Oxygen Atom ◽  
Molecular Oxygen ◽  
Aromatic Compounds ◽  
Oxygen Molecule ◽  
Active Oxygen ◽  
Hydroxyl Group ◽  
Phosphate Complex ◽  
A New Species

Reduction of molecular oxygen by a stannous phosphate complex in aqueous solution leads to a new species of active oxygen capable of hydroxylating aliphatic and aromatic compounds. The hydroxylation reactions are shown to require two electrons per oxygen molecule reduced. The oxygen atom of the hydroxyl group is completely derived from molecular oxygen. This new mechanism has been proposed as a model for mixed function oxygenases.

Kinetics and mechanism of the bromination of phenols in aqueous solution. Evidence of general base catalysis of bromine attack

1990 ◽  
Vol 68 (10) ◽  
pp. 1769-1773 ◽  
Author(s):  
Oswald S. Tee ◽  
N. Rani Iyengar
Keyword(s):  
Aqueous Solution ◽  
Kinetics And Mechanism ◽  
Base Catalysis ◽  
Hydroxyl Group ◽  
Molecular Bromine ◽  
Electrophilic Attack ◽  
General Base ◽  
Carboxylate Anions

The reactions of bromine with phenol, 4-bromophenol, and 4-methylphenol (p-cresol) in aqueous solution are catalyzed by carboxylate anions, confirming the suggestions of earlier work. The results are consistent with deprotonation of the phenol hydroxyl group by a general base occurring at more or less the same time as electrophilic attack by molecular bromine. Possible origins of the general base catalysis are discussed. Combined with earlier results, the present findings suggest that a protonated cyclohexadienone is not a mandatory intermediate in phenol bromination; it can be avoided in both the formation of and enolization of the cyclohexadienone intermediate by general catalysis. Keywords: bromination, phenol, mechanism, catalysis, kinetics.

Fluoride ion removal from aqueous solution, groundwater, and seawater by granular and powdered Conocarpus erectus biochar

2017 ◽  
Vol 65 ◽  
pp. 375-386 ◽  
Author(s):  
Fatemeh Papari ◽  
Parham Rouhi Najafabadi ◽  
Bahman Ramavandi
Keyword(s):  
Aqueous Solution ◽  
Fluoride Ion ◽  
Ion Removal ◽  
Conocarpus Erectus

ChemInform Abstract: Directly Regioselective Protection of Secondary Hydroxyl Group on Ribosides in Aqueous Solution.

ChemInform ◽  
2013 ◽  
Vol 44 (47) ◽  
pp. no-no
Author(s):  
Ruigang Xu ◽  
Fei Liu ◽  
Yingju Liu ◽  
Beiqing Chen ◽  
Feng-Wu Liu
Keyword(s):  
Aqueous Solution ◽  
Hydroxyl Group ◽  
Secondary Hydroxyl

Adsorption of Benzene and Aniline Using a Novel Hypercrosslinked Polymeric Adsorbent Modified by Phenolic Hydroxyl Group

2013 ◽  
Vol 575-576 ◽  
pp. 130-134
Author(s):  
Xin Hua Yuan ◽  
Wen Hua Guo ◽  
Yan Lei ◽  
Yong Qiang Liu ◽  
Ji Ye Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Bond ◽  
Chemical Interaction ◽  
Liquid Paraffin ◽  
Phenolic Hydroxyl ◽  
Hydroxyl Group ◽  
Physical Interaction ◽  
Crosslinking Reaction ◽  
Polymeric Adsorbent ◽  
Hypercrosslinked Polymeric Adsorbent

Using gelatin as dispersant, liquid paraffin as porogen, novel hypercrosslinked polymeric adsorbents of LM-5 and LM-6 were prepared by post-crosslinking reaction with phenol and 2-naphthol, respectively. Bromoethane was used as crosslinking reagent to substitute poisonous organic compound of chloromethyl methylether. 2-Naphthol was used in the post-crosslinking reaction to enhance phenolic hydroxyl group content. The experiments of selective adsorbing aniline on resins in mixture solution, which consisting of benzene and aniline, show that the adsorption of aniline and benzene on LM-6 in aqueous solution are mainly pushed by physical interaction. The adsorption of aniline is also partly pushed by chemical interaction, and the adsorptive enthalpy illuminates that there exists hydrogen-bonding. Owning to the hydrogen-bond, the adsorption capacity of aniline on LM-6 is markedly higher than that of benzene.

Sign in / Sign up

Export Citation Format

Share Document