article · Arabian Journal of Chemistry
Industrial tanning processes frequently release crystal violet dye into aquatic ecosystems, causing notable environmental pollution. Conventional water treatment approaches often struggle to eliminate these micropollutants completely. This study examines crude chitin, a natural polysaccharide, as an alternative adsorbent material for removing crystal violet from water. Laboratory investigations reveal that a small quantity of crude chitin, specifically 0.08 grams, effectively captures the dye. The adsorption process reaches surface saturation within 80 minutes and operates more efficiently at higher pH levels, with performance rising as the pH increases from 4 to 12. Mathematical modelling confirms that the process aligns with pseudo-second-order kinetics and follows the Freundlich isotherm model. Thermodynamic assessments establish that the uptake of crystal violet onto crude chitin is spontaneous and endothermic. Surface characterisations before and after treatment outline the specific interactions governing the adsorption mechanism.
Coloured discharges containing crystal violet dye from tanning industries pose serious contamination threats to water bodies and are notoriously difficult to neutralise using standard treatments. Identifying low-cost, natural materials capable of trapping these stubborn micropollutants is vital for protecting aquatic life and securing cleaner water supplies. This research offers experimental validation of raw chitin as an accessible agent for industrial wastewater decontamination.
This research is early-stage laboratory work that could inform wastewater treatment processes for tanning and textile industries aiming to manage dye effluents. Water treatment operators and industrial facilities could potentially use crude chitin as an eco-friendly filter medium. However, practical application remains distant, as the study focuses strictly on bench-scale batch tests, reaction kinetics, and surface characterisation without piloting continuous-flow systems or assessing cost-effectiveness at commercial scale.
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The colored discharges from certain tanning industries into aquatic environments are too heavy with violet crystal; these discharges have recently become a significant environmental problem. The objective of this work is to find an effective method to stop the propagation of these micropollutants in water. Although various treatment techniques have been tested, they are often ineffective in treating these micropollutants. This study focuses on optimizing the parameters involved in the adsorption process of crystal violet (CV) using crude chitin (RC). It was found that a mass of 0.08 g of RC can effectively retain CV. Modeling of the experimental results indicated that the adsorption kinetics of CV onto raw chitin follows pseudo-second-order kinetics at the temperatures studied, and the intra-particle diffusion was not only the rate controlling step. After 80 minutes of contact, a saturation of the surface is obtained. The Freundlich model describes adsorption isotherms. The adsorbed quantities increase when the pH goes from 4 to 12. The thermodynamic study showed that the adsorption of CV on RC is spontaneous (ΔG° < 0) and endothermic (ΔH° > 0). The value of pHpzc is located at pHpzc = 8.4. Characterization of the raw chitin surface by FTIR, XRD, DTA/TGA and SEM/EDS before and after contact with CV shed light on the nature of interactions between CV and RC.
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DOI: 10.1016/j.arabjc.2023.105453
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