Work

Mechanistic insights into the co-adsorption of crystal violet and allura red on a sustainable biomass-based nanocomposite

Year: 2026

Type: article

Abstract: for CV in a single-dye system. For AR and CV indicating the monolayer adsorption process, the Langmuir adsorption isotherm fits the data the best. Both dyes in this system adhere to a pseudo-second-order kinetic model, which implies that the availability of surface sites determines the adsorption rate. In binary systems, adsorption evolved into a cooperative-competitive network in which preferential AR anchoring under acidic conditions induced surface charge heterogeneity. The adsorption of AR in a binary mixture was well described by the Extended Freundlich isotherm, whereas for CV, the Extended Langmuir-Freundlich model fitted the best. Overall, the combined spectroscopic and adsorption analyses suggest that adsorption proceeds through a synergistic interplay of electrostatic interactions, hydrogen bonding, and possible coordination effects, operating collectively rather than independently. The findings demonstrate that multicomponent adsorption cannot be reliably predicted from single-solute systems and highlight the importance of inter-adsorbate interactions in governing adsorption behaviour. This work provides new mechanistic insight into dye-assisted adsorption and supports the development of biomass-based adsorbents for complex wastewater treatment.

Source: RSC Advances

DOI: 10.1039/d6ra03904a

Authors: Neha Jarodhia, Kuldeep Joshi

Institution: Central University of Gujarat

Language: English

Topic: Adsorption and biosorption for pollutant removal

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

SDG: Clean water and sanitation

Open Access status: gold

Estimated APC paid: $1,042