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Related Concept Videos

Adsorption Isotherms II01:25

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene01:15

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
Structure of Benzene: Kekulé Model01:07

Structure of Benzene: Kekulé Model

In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
Precipitation of Ions03:11

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
Adsorption Isotherms I01:29

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...

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Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
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Published on: June 28, 2019

Bromate adsorption using Fe-pillared bentonite.

Shilong He1, Dandan Zhang, Li Gu

  • 1School of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou, China. hslongrcees@163.com

Environmental Technology
|February 12, 2013
PubMed
Summary
This summary is machine-generated.

Fe-pillared bentonite effectively removes bromate, a hazardous drinking water contaminant. Adsorption kinetics followed a pseudo-second-order model, with optimal removal influenced by temperature, pH, and competing anions.

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Published on: February 21, 2017

Area of Science:

  • Environmental Science
  • Water Treatment
  • Materials Science

Background:

  • Bromate is an emerging hazardous substance found in drinking water.
  • Effective removal methods are crucial for public health and water safety.

Purpose of the Study:

  • To investigate the efficacy of Fe-pillared bentonite for bromate removal from water.
  • To analyze the influence of various experimental parameters on bromate adsorption.

Main Methods:

  • Adsorption experiments were conducted varying contact time, initial bromate concentration, temperature, pH, and competing anions.
  • Adsorption kinetics were modeled using pseudo-second-order kinetics.
  • Equilibrium data were fitted to Freundlich, Langmuir, Redlich-Peterson, and Toth isotherm models.

Main Results:

  • Bromate adsorption followed the pseudo-second-order kinetic model, reaching equilibrium within 60 minutes.
  • The Toth and Redlich-Peterson isotherm models provided a better fit for bromate adsorption data.
  • Temperature, solution pH, and the presence of competing anions significantly affected bromate removal efficiency.

Conclusions:

  • Fe-pillared bentonite demonstrates significant effectiveness in removing bromate from water.
  • The study provides valuable insights into the adsorption mechanisms and optimal conditions for bromate remediation.