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EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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Microbial Bioremediation of Uranium01:25

Microbial Bioremediation of Uranium

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Microorganisms play a critical role in the transformation and immobilization of uranium in contaminated environments through four main pathways: bioreduction, biosorption, bioaccumulation, and biomineralization. These mechanisms reduce uranium’s toxicity and prevent its migration through groundwater systems, offering sustainable approaches for in situ bioremediation.Bioreduction of UraniumBioreduction is driven by anaerobic bacteria such as certain strains of Geobacter and Shewanella,...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Masking and Demasking Agents01:19

Masking and Demasking Agents

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Factors Affecting Solubility04:01

Factors Affecting Solubility

39.2K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
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Enhanced Arsenate Removal Performance in Aqueous Solution by Yttrium-Based Adsorbents.

Sang-Ho Lee1, Kyoung-Woong Kim2, Byung-Tae Lee3

  • 1School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, 123, Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea. ddlee19@gist.ac.kr.

International Journal of Environmental Research and Public Health
|October 31, 2015
PubMed
Summary

A novel titanium-loaded basic yttrium carbonate (Ti-loaded BYC) adsorbent effectively removes toxic arsenic from drinking water. This material exhibits superior adsorption capacity and a faster removal rate compared to other yttrium-based adsorbents.

Keywords:
adsorptionarsenate removalbasic yttrium carbonate (BYC)maximum adsorption capacityspecific surface areasurface modification

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Water Treatment

Background:

  • Arsenic contamination in drinking water poses significant human health risks due to its high toxicity.
  • Developing efficient and cost-effective adsorbents is crucial for arsenic remediation.

Purpose of the Study:

  • To develop and evaluate novel yttrium-based adsorbents for arsenic removal from water.
  • To compare the adsorption performance of basic yttrium carbonate (BYC), Ti-loaded BYC, and yttrium hydroxide.

Main Methods:

  • Synthesis of yttrium-based adsorbents (BYC, Ti-loaded BYC, yttrium hydroxide) via co-precipitation.
  • Adsorption experiments using Langmuir isotherm and pseudo-first/second-order kinetic models.
  • Evaluation of adsorption capacity, removal rate, and performance across a wide pH range and in the presence of competing anions.

Main Results:

  • Ti-loaded BYC demonstrated a maximum adsorption capacity of 348.5 mg/g, 25% higher than BYC (289.6 mg/g) and yttrium hydroxide (206.5 mg/g).
  • Ti-loaded BYC exhibited a faster arsenate removal rate and maintained high adsorption affinity across a broad pH range (3-11).
  • The dominant removal mechanism for BYC and Ti-loaded BYC was identified as carbonate-arsenate ion exchange.

Conclusions:

  • Ti-loaded BYC is a highly effective adsorbent for arsenate removal from drinking water.
  • The enhanced performance of Ti-loaded BYC is attributed to its increased specific surface area and surface charge.
  • Ti-loaded BYC shows promise as a practical solution for arsenic remediation in various water conditions.