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Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Preparation of Nitriles01:12

Preparation of Nitriles

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One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
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Precipitation Titration: Overview01:26

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Precipitation titration involves the reaction of a titrant and an analyte to generate an insoluble precipitate. While precipitation titration uses various precipitating agents, silver nitrate is the most common precipitating reagent; titrations involving Ag+ are called argentometric titrations. Usually, the endpoint in a precipitation titration can be detected by visual indicators.
A precipitation titration curve demonstrates the change in concentration of the titrant or analyte upon adding the...
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Precipitation Titration Curve: Analysis01:21

Precipitation Titration Curve: Analysis

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The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
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Washing, Drying, and Ignition of Precipitates00:52

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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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Preparation of Aldehydes and Ketones from Nitriles and Carboxylic Acids01:24

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3.6K
Although it is possible to reduce a carboxylic acid to an aldehyde, strong reducing agents, like lithium aluminum hydride (LAH), prohibit a controlled reduction, instead causing the generated aldehyde to instantly over-reduce to a primary alcohol.
Reducing carboxylic acid derivatives like acyl chlorides (RCOCl), esters (RCO2R′), and nitriles (RCN) using milder aluminum hydride agents like lithium tri-tert-butoxyaluminum hydride [LiAlH(O-t-Bu)3] and diisobutylaluminum hydride [DIBAL-H]...
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Preparation of TiO

Solmaz Feizpoor1, Aziz Habibi-Yangjeh2, Rafael Luque3

  • 1Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran; Departamento de Química Organica, Campus de Rabanales, Universidad de Cordoba, Edificio Marie Curie (C-3), Ctra. N-IV Km. 396, Cordoba, 14014, Spain.

Chemosphere
|June 8, 2023
PubMed
Summary

A novel TiO2/Fe-MOF photocatalyst effectively degrades tetracycline hydrochloride (TC) under visible light. This advanced material shows a 97% removal efficiency, significantly outperforming pure TiO2 for environmental remediation.

Keywords:
Antibiotic pollutantsPhotocatalytic performanceTiO(2)/Fe-MOFVisible-light degradation

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Visible-light photocatalysis offers a promising route for degrading diverse environmental pollutants.
  • Antibiotics, such as tetracycline hydrochloride (TC), pose significant risks to ecosystems and human health.
  • Developing efficient photocatalysts is crucial for effective water purification and pollution control.

Purpose of the Study:

  • To synthesize and characterize a novel n-n heterojunction TiO2/Fe-MOF photocatalyst.
  • To evaluate the photocatalytic efficiency of TiO2/Fe-MOF for tetracycline hydrochloride (TC) degradation under visible light.
  • To investigate the mechanisms behind the enhanced photocatalytic activity.

Main Methods:

  • Solvothermal synthesis was employed to create the TiO2/Fe-MOF nanocomposite.
  • Comprehensive characterization was performed using techniques including XRD, XPS, TEM, SEM, BET, DRS, PL, and EIS.
  • Photocatalytic degradation experiments were conducted under visible light irradiation to assess TC removal efficiency.

Main Results:

  • The successful synthesis of the n-n heterojunction TiO2/Fe-MOF was confirmed through various characterization techniques.
  • The TiO2/Fe-MOF (15%) nanocomposite achieved 97% TC removal within 240 minutes, an 11-fold improvement over pure TiO2.
  • Enhanced charge carrier migration and suppressed recombination were evidenced by PL and EIS analyses, contributing to improved photocatalysis.

Conclusions:

  • The TiO2/Fe-MOF n-n heterojunction photocatalyst demonstrates superior performance for visible-light-driven TC degradation.
  • The enhanced efficiency is attributed to a broadened light response and effective charge separation at the heterojunction interface.
  • The material exhibits good stability and potential for practical applications in wastewater treatment and environmental remediation.