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Related Concept Videos

Amino acids03:42

Amino acids

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Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...
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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
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Crossing Over01:34

Crossing Over

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Dynamic Adsorption of Low-Concentration Formaldehyde Using One-Step Synthesized Amino-Functionalized

Tian-Tian Jiao1,2,3, Hui-Ying Fan1, Ran-Ran Hou2

  • 1College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, P. R. China.

Precision Chemistry
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Summary
This summary is machine-generated.

New amino-functional hyper-cross-linked polymers effectively capture formaldehyde (FA) emissions. These ionic compounds offer high capacity and selectivity, surpassing traditional adsorbents for improved environmental and health protection.

Keywords:
density functional theorydynamic adsorptionformaldehydehydrogen bondhyper-cross-linked ionic copolymer

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Polymer Chemistry

Background:

  • Formaldehyde (FA) emissions pose significant environmental and health risks.
  • Traditional adsorbents exhibit limitations in capacity and selectivity for FA removal.

Purpose of the Study:

  • To design and synthesize novel amino-functional hyper-cross-linked copolymer ionic compounds (HPIL-Cl-Xs) for efficient formaldehyde adsorption.
  • To optimize synthesis parameters and evaluate the adsorption performance of HPIL-Cl-Xs.

Main Methods:

  • One-step synthesis involving hyper-cross-linking and quaternization of benzimidazole, dichloro-p-xylene, and functional monomers.
  • Characterization using DFT calculations, XPS, and FT-IR.
  • Adsorption performance evaluation under varying conditions (temperature, WHSV, humidity).

Main Results:

  • HPIL-Cl-Phe achieved an equilibrium adsorption capacity of 11.3 mg/g at 8.6 ppm FA and 54,000 h⁻¹ WHSV.
  • The partitioning coefficient (PC) reached 0.44 mol·kg⁻¹·Pa⁻¹, exceeding conventional adsorbents.
  • Demonstrated adaptability to various environmental conditions and excellent cycling stability.

Conclusions:

  • Amino-functional hyper-cross-linked copolymer ionic compounds are highly effective for formaldehyde removal.
  • The developed materials offer superior adsorption capacity and selectivity compared to traditional adsorbents.
  • HPIL-Cl-Xs show promise for practical applications in mitigating formaldehyde pollution.