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Related Concept Videos

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Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
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Consider a neutral form of an amine, B, with a partition coefficient, K, in a liquid mixture containing organic and aqueous phases. The pH of the aqueous phase affects the charge on acidic and basic solutes, and the charged form is usually more soluble in the aqueous phase. Suppose the conjugate acid form of the amine is soluble only in the aqueous phase while the base form is soluble in both phases. Then the distribution coefficient, D, can be given as the ratio of amine concentration in the...
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Related Experiment Video

Updated: Feb 7, 2026

Polyethyleneimine-coated Iron Oxide Nanoparticles as a Vehicle for the Delivery of Small Interfering RNA to Macrophages In Vitro and In Vivo
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Polyethyleneimine-functionalized Luffa cylindrica for efficient uranium extraction.

Shouzheng Su1, Qi Liu2, Jingyuan Liu1

  • 1Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, 150001, PR China.

Journal of Colloid and Interface Science
|July 14, 2018
PubMed
Summary
This summary is machine-generated.

Novel adsorbents derived from Luffa cylindrica (LC) and polyethyleneimine (PEI) show high efficiency for uranium (U(VI)) removal from seawater. The LC-PGMA-PEI adsorbent demonstrated superior performance and reusability for sustainable uranium recovery.

Keywords:
Luffa cylindricaPolyethyleneimineSeawaterUranium“grafting-from” and “grafting-to” approaches

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Uranium (U(VI)) contamination in seawater poses environmental risks.
  • Development of efficient adsorbents for uranium removal is crucial for environmental remediation.
  • Luffa cylindrica (LC) offers a sustainable and abundant source for adsorbent materials.

Purpose of the Study:

  • To synthesize and characterize novel Luffa cylindrica (LC) based adsorbents modified with polyethyleneimine (PEI).
  • To investigate the adsorption performance of these modified adsorbents for U(VI) removal from aqueous solutions and simulated seawater.
  • To evaluate the influence of critical factors like pH, initial concentration, and contact time on U(VI) adsorption.

Main Methods:

  • Preparation of LC-EPI-PEI and LC-PGMA-PEI adsorbents using "grafting-from" and "grafting-to" approaches.
  • Adsorption experiments were conducted to study the effects of pH, initial U(VI) concentration, and contact time.
  • Adsorption isotherms and kinetics were analyzed using Langmuir and pseudo-second order models, respectively.

Main Results:

  • U(VI) adsorption was highly pH-dependent for both LC-EPI-PEI and LC-PGMA-PEI.
  • Maximum monolayer adsorption capacities were 208.3 mg/g for LC-EPI-PEI and 438.5 mg/g for LC-PGMA-PEI.
  • Adsorption followed Langmuir isotherm and pseudo-second order kinetic models, indicating a chemical adsorption process.
  • LC-PGMA-PEI demonstrated excellent reusability over ten cycles and effective adsorption at low U(VI) concentrations.

Conclusions:

  • Novel LC-based adsorbents modified with PEI are effective for U(VI) removal.
  • LC-PGMA-PEI exhibits superior adsorption capacity, reusability, and performance in simulated seawater.
  • These findings highlight the potential of LC-PGMA-PEI for sustainable uranium recovery from aqueous environments.