Summary

Adsorption dynamics of aqueous dyes encompass the processes by which dye molecules in liquid solution become bound to solid surfaces, a phenomenon governed by interactions at the molecular level and by transport phenomena in the bulk solution. This field addresses the urgent need to remove synthetic and natural colourants—many of which are toxic or persistent—from industrial effluents and wastewater. Key factors influencing adsorption include the physicochemical properties of both adsorbent and adsorbate, notably surface area, pore structure, functional group chemistry, pH, temperature and ionic strength. Adsorption kinetics elucidate the rate at which equilibrium is attained, often described by pseudo-first-order or pseudo-second-order models, while equilibrium studies employ isotherm models—most commonly Langmuir and Freundlich—to characterise monolayer versus multilayer uptake. Recent advances have focused on designing bespoke materials—from engineered metal oxides to sustainable biosorbents—capable of high capacity, rapid uptake and facile regeneration. The global imperative for clean water has driven innovation in adsorbent synthesis, mechanistic understanding of dye–surface interactions and the integration of adsorption processes into scalable treatment systems.

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Adsorption Dynamics of Aqueous Dyes publication trend

The graph below shows the total number of articles in adsorption dynamics of aqueous dyes across all publications each year (not limited to Nature Index journals).

Technical terms

Adsorption: The adhesion of molecules (adsorbate) from a liquid phase onto the surface of a solid material (adsorbent).

Biosorbent: A biological or biomass-derived material used to adsorb contaminants from aqueous solutions.

Kinetic model: A mathematical description of the rate at which adsorption proceeds, commonly pseudo-first-order or pseudo-second-order.

Isotherm model: A representation of equilibrium adsorption, relating adsorbate concentration to the amount adsorbed at constant temperature (e.g., Langmuir, Freundlich).

Langmuir isotherm: A model assuming monolayer adsorption onto a homogeneous surface with finite binding sites.

Pseudo-second-order model: A kinetic expression that assumes the rate-limiting step involves chemisorption and correlates adsorption capacity with the square of unoccupied sites.

References

  1. Functionalised mesoporous biosorbents for efficient removal of hazardous pollutants from water environment. Journal of Water Process Engineering (2023).
  2. Adsorption of Eriochrome Black T on Pseudo Boehmite and Gamma Alumina Synthesized from Drinking Water Treatment Sludge: A Waste-to-Recycling Approach. Recycling (2024).
  3. Synergetic removal of hazardous pollutants from aqueous environment using lignocellulosic biosorbents. Journal of Molecular Liquids (2023).

About these summaries

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